build: bump minimum Go version to 1.18, as a dependency in ./tools requires it

https://app.circleci.com/pipelines/github/zrepl/zrepl/6085/workflows/bf5b11f2-8dc4-40a2-bb7a-fcf3cf8205d4/jobs/42340

  ...
  build github.com/golangci/golangci-lint/cmd/golangci-lint: cannot load io/fs: cannot find module providing package io/fs
  go install github.com/wadey/gocovmerge
  go: downloading github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad
  go: extracting github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad
  go install golang.org/x/tools/cmd/goimports
  # golang.org/x/mod/module
  ../../go/pkg/mod/golang.org/x/mod@v0.6.0/module/module.go:147:5: undefined: errors.As
  note: module requires Go 1.17
  go install golang.org/x/tools/cmd/stringer
  # golang.org/x/tools/go/internal/gcimporter
  ../../go/pkg/mod/golang.org/x/tools@v0.2.0/go/internal/gcimporter/iimport.go:520:9: undefined: constant.Make
  ../../go/pkg/mod/golang.org/x/tools@v0.2.0/go/internal/gcimporter/iimport.go:616:9: undefined: constant.Make
  note: module requires Go 1.18
  go install google.golang.org/grpc/cmd/protoc-gen-go-grpc
  go: downloading google.golang.org/grpc v1.46.2
  go: extracting google.golang.org/grpc v1.46.2
  go: downloading google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
  go: extracting google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
  go install google.golang.org/protobuf/cmd/protoc-gen-go

  Exited with code exit status 123

.circleci/config.yml

@@ -24,7 +24,12 @@ commands:
 
   apt-update-and-install-common-deps:
     steps:
-      - run: sudo apt update && sudo apt install gawk make
+      - run: sudo apt-get update
+      - run: sudo apt-get install -y gawk make
+      # CircleCI doesn't update its cimg/go images.
+      # So, need to update manually to get up-to-date trust chains.
+      # The need for this was required for cimg/go:1.12, but let's future proof this here and now.
+      - run: sudo apt-get install -y git ca-certificates
 
   restore-cache-gomod:
     steps:
@@ -150,7 +155,7 @@ parameters:
 
   release_docker_baseimage_tag:
     type: string
-    default: "1.17"
+    default: "1.19"
 
 workflows:
   version: 2
@@ -160,19 +165,19 @@ workflows:
     jobs:
       - quickcheck-docs
       - quickcheck-go: &quickcheck-go-smoketest
-          name: quickcheck-go-amd64-linux-1.17
-          goversion: &latest-go-release "1.17"
+          name: quickcheck-go-amd64-linux-1.19
+          goversion: &latest-go-release "1.19"
           goos: linux
           goarch: amd64
       - test-go-on-latest-go-release:
           goversion: *latest-go-release
       - quickcheck-go:
           requires:
-            - quickcheck-go-amd64-linux-1.17 #quickcheck-go-smoketest.name
+            - quickcheck-go-amd64-linux-1.19 #quickcheck-go-smoketest.name
           matrix: &quickcheck-go-matrix
             alias: quickcheck-go-matrix
             parameters:
-              goversion: [*latest-go-release, "1.12"]
+              goversion: [*latest-go-release, "1.18"]
               goos: ["linux", "freebsd"]
               goarch: ["amd64", "arm64"]
             exclude:
@@ -180,10 +185,6 @@ workflows:
               - goversion: *latest-go-release
                 goos: linux
                 goarch: amd64
-              # not supported by Go 1.12
-              - goversion: "1.12"
-                goos: freebsd
-                goarch: arm64
 
   release:
     when: << pipeline.parameters.do_release >>
@@ -249,7 +250,7 @@ jobs:
       goarch:
         type: string
     docker:
-      - image: circleci/golang:<<parameters.goversion>>
+      - image: cimg/go:<<parameters.goversion>>
     environment:
       GOOS: <<parameters.goos>>
       GOARCH: <<parameters.goarch>>
@@ -257,12 +258,13 @@ jobs:
     steps:
       - checkout
 
+      - install-godep
+
       - restore-cache-gomod
       - run: go mod download
       - run: cd build && go mod download
       - save-cache-gomod
 
-      - install-godep
       - run: make formatcheck
       - run: make generate-platform-test-list
       - run: make zrepl-bin test-platform-bin
@@ -286,7 +288,7 @@ jobs:
       goversion:
         type: string
     docker:
-      - image: circleci/golang:<<parameters.goversion>>
+      - image: cimg/go:<<parameters.goversion>>
     steps:
       - checkout
       - restore-cache-gomod
@@ -294,7 +296,8 @@ jobs:
       # don't save-cache-gomod here, test-go doesn't pull all the dependencies
 
   release-build:
-    machine: true
+    machine:
+      image: ubuntu-2004:202201-02
     steps:
       - checkout
       - run: make release-docker RELEASE_DOCKER_BASEIMAGE_TAG=<<pipeline.parameters.release_docker_baseimage_tag>>
@@ -302,7 +305,8 @@ jobs:
           root: .
           paths: [.]
   release-deb:
-    machine: true
+    machine:
+      image: ubuntu-2004:202201-02
     steps:
       - attach_workspace:
           at: .
@@ -313,7 +317,8 @@ jobs:
             - "artifacts/*.deb"
 
   release-rpm:
-    machine: true
+    machine:
+      image: ubuntu-2004:202201-02
     steps:
       - attach_workspace:
           at: .

.golangci.yml

@@ -7,4 +7,10 @@ issues:
     - path: _test\.go
       linters:
         - errcheck
+    # Disable staticcheck 'Empty body in an if or else branch' as it's useful
+    # to put a comment into an empty else-clause that explains why whatever
+    # is done in the if-caluse is not necessary if the condition is false.
+    - linters:
+        - staticcheck
+      text: "SA9003:"
 

Makefile

@@ -28,7 +28,7 @@ GO_BUILDFLAGS := $(GO_MOD_READONLY) $(GO_EXTRA_BUILDFLAGS)
 GO_BUILD := $(GO_ENV_VARS) $(GO) build $(GO_BUILDFLAGS) -ldflags $(GO_LDFLAGS)
 GOLANGCI_LINT := golangci-lint
 GOCOVMERGE := gocovmerge
-RELEASE_DOCKER_BASEIMAGE_TAG ?= 1.17
+RELEASE_DOCKER_BASEIMAGE_TAG ?= 1.19
 RELEASE_DOCKER_BASEIMAGE ?= golang:$(RELEASE_DOCKER_BASEIMAGE_TAG)
 
 ifneq ($(GOARM),)
@@ -55,7 +55,7 @@ release: clean
 	$(MAKE) wrapup-and-checksum
 	$(MAKE) check-git-clean
 ifeq (SIGN, 1)
-	$(make) sign
+	$(MAKE) sign
 endif
 	@echo "ZREPL RELEASE ARTIFACTS AVAILABLE IN artifacts/release"
 
@@ -134,7 +134,13 @@ endif
 
 deb-docker:
 	docker build -t zrepl_debian_pkg --pull -f packaging/deb/Dockerfile .
+	# Use a small open file limit to make fakeroot work. If we don't
+	# specify it, docker daemon will use its file limit. I don't know
+	# what changed (Docker, its systemd service, its Go version). But I
+	# observed fakeroot iterating close(i) up to i > 1000000, which costs
+	# a good amount of CPU time and makes the build slow.
 	docker run --rm -i -v $(CURDIR):/build/src -u $$(id -u):$$(id -g) \
+		--ulimit nofile=1024:1024 \
 		zrepl_debian_pkg \
 		make deb GOOS=$(GOOS) GOARCH=$(GOARCH) GOARM=$(GOARM)
 
@@ -173,6 +179,10 @@ check-git-clean:
 		fi; \
 	fi;
 
+tag-release:
+	test -n "$(ZREPL_TAG_VERSION)" || exit 1
+	git tag -u E27CA5FC -m "$(ZREPL_TAG_VERSION)" "$(ZREPL_TAG_VERSION)"
+
 sign:
 	gpg -u "89BC 5D89 C845 568B F578  B306 CDBD 8EC8 E27C A5FC" \
 		--armor \
@@ -329,12 +339,12 @@ $(ARTIFACTDIR)/go_env.txt:
 
 docs: $(ARTIFACTDIR)/docs
 	# https://www.sphinx-doc.org/en/master/man/sphinx-build.html
-	make -C docs \
+	$(MAKE) -C docs \
 		html \
 		BUILDDIR=../artifacts/docs \
 		SPHINXOPTS="-W --keep-going -n"
 
 docs-clean:
-	make -C docs \
+	$(MAKE) -C docs \
 		clean \
 		BUILDDIR=../artifacts/docs

README.md

@@ -1,11 +1,12 @@
 [![GitHub license](https://img.shields.io/github/license/zrepl/zrepl.svg)](https://github.com/zrepl/zrepl/blob/master/LICENSE)
-[![Language: Go](https://img.shields.io/badge/language-Go-6ad7e5.svg)](https://golang.org/)
+[![Language: Go](https://img.shields.io/badge/lang-Go-6ad7e5.svg)](https://golang.org/)
 [![User Docs](https://img.shields.io/badge/docs-web-blue.svg)](https://zrepl.github.io)
-[![Support me on Patreon](https://img.shields.io/badge/dynamic/json?color=yellow&label=Patreon&query=data.attributes.patron_count&suffix=%20patrons&url=https%3A%2F%2Fwww.patreon.com%2Fapi%2Fcampaigns%2F3095079)](https://patreon.com/zrepl)
+[![Support me on Patreon](https://img.shields.io/badge/dynamic/json?color=yellow&label=Patreon&query=data.attributes.patron_count&url=https%3A%2F%2Fwww.patreon.com%2Fapi%2Fcampaigns%2F3095079)](https://patreon.com/zrepl)
 [![Donate via GitHub Sponsors](https://img.shields.io/static/v1?label=Sponsor&message=%E2%9D%A4&logo=GitHub&style=flat&color=yellow)](https://github.com/sponsors/problame)
 [![Donate via Liberapay](https://img.shields.io/liberapay/patrons/zrepl.svg?logo=liberapay)](https://liberapay.com/zrepl/donate)
 [![Donate via PayPal](https://img.shields.io/badge/donate-paypal-yellow.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=R5QSXJVYHGX96)
 [![Twitter](https://img.shields.io/twitter/url/https/github.com/zrepl/zrepl.svg?style=social)](https://twitter.com/intent/tweet?text=Wow:&url=https%3A%2F%2Fgithub.com%2Fzrepl%2Fzrepl)
+[![Chat](https://img.shields.io/badge/chat-matrix-blue.svg)](https://matrix.to/#/#zrepl:matrix.org)
 
 # zrepl
 zrepl is a one-stop ZFS backup & replication solution.

build/go.mod

@@ -4,13 +4,10 @@ go 1.12
 
 require (
 	github.com/alvaroloes/enumer v1.1.1
-	github.com/golangci/golangci-lint v1.35.2
-	github.com/golangci/misspell v0.3.4 // indirect
-	github.com/golangci/revgrep v0.0.0-20180812185044-276a5c0a1039 // indirect
-	github.com/spf13/afero v1.2.2 // indirect
+	github.com/golangci/golangci-lint v1.50.1
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad
-	golang.org/x/tools v0.0.0-20210105210202-9ed45478a130
+	golang.org/x/tools v0.2.0
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0 // indirect
-	google.golang.org/protobuf v1.25.0
+	google.golang.org/protobuf v1.28.0
 )

client/configcheck.go

@@ -19,8 +19,9 @@ import (
 )
 
 var configcheckArgs struct {
-	format string
-	what   string
+	format        string
+	what          string
+	skipCertCheck bool
 }
 
 var ConfigcheckCmd = &cli.Subcommand{
@@ -29,6 +30,7 @@ var ConfigcheckCmd = &cli.Subcommand{
 	SetupFlags: func(f *pflag.FlagSet) {
 		f.StringVar(&configcheckArgs.format, "format", "", "dump parsed config object [pretty|yaml|json]")
 		f.StringVar(&configcheckArgs.what, "what", "all", "what to print [all|config|jobs|logging]")
+		f.BoolVar(&configcheckArgs.skipCertCheck, "skip-cert-check", false, "skip checking cert files")
 	},
 	Run: func(ctx context.Context, subcommand *cli.Subcommand, args []string) error {
 		formatMap := map[string]func(interface{}){
@@ -56,8 +58,16 @@ var ConfigcheckCmd = &cli.Subcommand{
 		}
 
 		var hadErr bool
+
+		parseFlags := config.ParseFlagsNone
+
+		if configcheckArgs.skipCertCheck {
+			parseFlags |= config.ParseFlagsNoCertCheck
+		}
+
 		// further: try to build jobs
-		confJobs, err := job.JobsFromConfig(subcommand.Config())
+		confJobs, err := job.JobsFromConfig(subcommand.Config(), parseFlags)
+
 		if err != nil {
 			err := errors.Wrap(err, "cannot build jobs from config")
 			if configcheckArgs.what == "jobs" {

client/migrate.go

@@ -129,7 +129,7 @@ func doMigrateReplicationCursor(ctx context.Context, sc *cli.Subcommand, args []
 	}
 
 	cfg := sc.Config()
-	jobs, err := job.JobsFromConfig(cfg)
+	jobs, err := job.JobsFromConfig(cfg, config.ParseFlagsNone)
 	if err != nil {
 		fmt.Printf("cannot parse config:\n%s\n\n", err)
 		fmt.Printf("NOTE: this migration was released together with a change in job name requirements.\n")

client/status/client/client.go

@@ -14,11 +14,11 @@ import (
 )
 
 type Client struct {
-	h http.Client
+	h *http.Client
 }
 
 func New(network, addr string) (*Client, error) {
-	httpc, err := controlHttpClient(func(_ context.Context) (net.Conn, error) { return net.Dial(network, addr) })
+	httpc, err := makeControlHttpClient(func(_ context.Context) (net.Conn, error) { return net.Dial(network, addr) })
 	if err != nil {
 		return nil, err
 	}
@@ -63,8 +63,8 @@ func (c *Client) SignalReset(job string) error {
 	return c.signal(job, "reset")
 }
 
-func controlHttpClient(dialfunc func(context.Context) (net.Conn, error)) (client http.Client, err error) {
-	return http.Client{
+func makeControlHttpClient(dialfunc func(context.Context) (net.Conn, error)) (client *http.Client, err error) {
+	return &http.Client{
 		Transport: &http.Transport{
 			DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
 				return dialfunc(ctx)
@@ -73,14 +73,24 @@ func controlHttpClient(dialfunc func(context.Context) (net.Conn, error)) (client
 	}, nil
 }
 
-func jsonRequestResponse(c http.Client, endpoint string, req interface{}, res interface{}) error {
+func jsonRequestResponse(c *http.Client, endpoint string, req interface{}, res interface{}) error {
 	var buf bytes.Buffer
 	encodeErr := json.NewEncoder(&buf).Encode(req)
 	if encodeErr != nil {
 		return encodeErr
 	}
 
-	resp, err := c.Post("http://unix"+endpoint, "application/json", &buf)
+	hreq, err := http.NewRequest("POST", "http://unix"+endpoint, &buf)
+	if err != nil {
+		return err
+	}
+	hreq.Header.Set("Content-Type", "application/json")
+	// Prevent EOF errors when client request frequency and server keepalive close are at the same time.
+	// Found this by watching http.Server.ConnState changes, then found
+	// https://stackoverflow.com/questions/17714494/golang-http-request-results-in-eof-errors-when-making-multiple-requests-successi
+	// Note: The issue seems even more prounounced with local TCP sockets than unix domain sockets. So, I used that for debugging.
+	hreq.Close = true
+	resp, err := c.Do(hreq)
 	if err != nil {
 		return err
 	}

client/status/status_interactive.go

@@ -129,7 +129,7 @@ func interactive(c Client, flag statusFlags) error {
 		FSFilter:                func(_ string) bool { return true },
 		DetailViewWidth:         100,
 		DetailViewWrap:          false,
-		ShortKeybindingOverview: "[::b]Q[::-] quit  [::b]<TAB>[::-] switch panes  [::b]Shift+M[::-] toggle navbar  [::b]Shift+S[::-] signal job [::b]</>[::-] filter filesystems",
+		ShortKeybindingOverview: "[::b]Q[::-] quit  [::b]<TAB>[::-] switch panes [::b]W[::-] wrap lines  [::b]Shift+M[::-] toggle navbar  [::b]Shift+S[::-] signal job [::b]</>[::-] filter filesystems",
 	}
 	paramsMtx := &sync.Mutex{}
 	var redraw func()

client/status/viewmodel/render.go

@@ -228,8 +228,16 @@ func printFilesystemStatus(t *stringbuilder.B, rep *report.FilesystemReport, max
 	}
 
 	userVisisbleCurrentStep, userVisibleTotalSteps := rep.CurrentStep, len(rep.Steps)
-	if len(rep.Steps) > 0 {
-		userVisisbleCurrentStep = rep.CurrentStep + 1 // CurrentStep is an index that starts at 0
+	// `.CurrentStep` is == len(rep.Steps) if all steps are done.
+	// Until then, it's an index into .Steps that starts at 0.
+	// For the user, we want it to start at 1.
+	if rep.CurrentStep >= len(rep.Steps) {
+		// rep.CurrentStep is what we want to show.
+		// We check for >= and not == for robustness.
+	} else {
+		// We're not done yet, so, make step count start at 1
+		// (The `.State` is included in the output, indicating we're not done yet)
+		userVisisbleCurrentStep = rep.CurrentStep + 1
 	}
 	status := fmt.Sprintf("%s (step %d/%d, %s/%s)%s",
 		strings.ToUpper(string(rep.State)),
@@ -265,9 +273,9 @@ func printFilesystemStatus(t *stringbuilder.B, rep *report.FilesystemReport, max
 				attribs = append(attribs, "resumed")
 			}
 
-			attribs = append(attribs, fmt.Sprintf("encrypted=%s", nextStep.Info.Encrypted))
-
-			next += fmt.Sprintf(" (%s)", strings.Join(attribs, ", "))
+			if len(attribs) > 0 {
+				next += fmt.Sprintf(" (%s)", strings.Join(attribs, ", "))
+			}
 		} else {
 			next = "" // individual FSes may still be in planning state
 		}
@@ -539,10 +547,20 @@ func renderPrunerReport(t *stringbuilder.B, r *pruner.Report, fsfilter FilterFun
 
 func renderSnapperReport(t *stringbuilder.B, r *snapper.Report, fsfilter FilterFunc) {
 	if r == nil {
-		t.Printf("<snapshot type does not have a report>\n")
+		t.Printf("<no snapshotting report available>\n")
 		return
 	}
+	t.Printf("Type: %s\n", r.Type)
+	if r.Periodic != nil {
+		renderSnapperReportPeriodic(t, r.Periodic, fsfilter)
+	} else if r.Cron != nil {
+		renderSnapperReportCron(t, r.Cron, fsfilter)
+	} else {
+		t.Printf("<no details available>")
+	}
+}
 
+func renderSnapperReportPeriodic(t *stringbuilder.B, r *snapper.PeriodicReport, fsfilter FilterFunc) {
 	t.Printf("Status: %s", r.State)
 	t.Newline()
 
@@ -553,8 +571,25 @@ func renderSnapperReport(t *stringbuilder.B, r *snapper.Report, fsfilter FilterF
 		t.Printf("Sleep until: %s\n", r.SleepUntil)
 	}
 
-	sort.Slice(r.Progress, func(i, j int) bool {
-		return strings.Compare(r.Progress[i].Path, r.Progress[j].Path) == -1
+	renderSnapperPlanReportFilesystem(t, r.Progress, fsfilter)
+}
+
+func renderSnapperReportCron(t *stringbuilder.B, r *snapper.CronReport, fsfilter FilterFunc) {
+	t.Printf("State: %s\n", r.State)
+
+	now := time.Now()
+	if r.WakeupTime.After(now) {
+		t.Printf("Sleep until: %s (%s remaining)\n", r.WakeupTime, r.WakeupTime.Sub(now).Round(time.Second))
+	} else {
+		t.Printf("Started: %s (lasting %s)\n", r.WakeupTime, now.Sub(r.WakeupTime).Round(time.Second))
+	}
+
+	renderSnapperPlanReportFilesystem(t, r.Progress, fsfilter)
+}
+
+func renderSnapperPlanReportFilesystem(t *stringbuilder.B, fss []*snapper.ReportFilesystem, fsfilter FilterFunc) {
+	sort.Slice(fss, func(i, j int) bool {
+		return strings.Compare(fss[i].Path, fss[j].Path) == -1
 	})
 
 	dur := func(d time.Duration) string {
@@ -567,8 +602,8 @@ func renderSnapperReport(t *stringbuilder.B, r *snapper.Report, fsfilter FilterF
 	var widths struct {
 		path, state, duration int
 	}
-	rows := make([]*row, 0, len(r.Progress))
-	for _, fs := range r.Progress {
+	rows := make([]*row, 0, len(fss))
+	for _, fs := range fss {
 		if !fsfilter(fs.Path) {
 			continue
 		}
@@ -611,9 +646,11 @@ func renderSnapperReport(t *stringbuilder.B, r *snapper.Report, fsfilter FilterF
 		t.Printf("%s %s %s", path, state, duration)
 		t.PrintfDrawIndentedAndWrappedIfMultiline(" %s", r.remainder)
 		if r.hookReport != "" {
-			t.PrintfDrawIndentedAndWrappedIfMultiline("%s", r.hookReport)
+			t.AddIndent(1)
+			t.Newline()
+			t.Printf("%s", r.hookReport)
+			t.AddIndent(-1)
 		}
 		t.Newline()
 	}
-
 }

client/zfsabstractions.go

@@ -57,7 +57,7 @@ func (f *zabsFilterFlags) registerZabsFilterFlags(s *pflag.FlagSet, verb string)
 	for v := range endpoint.AbstractionTypesAll {
 		variants = append(variants, string(v))
 	}
-	variants = sort.StringSlice(variants)
+	sort.Strings(variants)
 	variantsJoined := strings.Join(variants, "|")
 	s.Var(&f.Types, "type", fmt.Sprintf("only %s holds of the specified type [default: all] [comma-separated list of %s]", verb, variantsJoined))
 

client/zfsabstractions_list.go

@@ -44,10 +44,11 @@ func doZabsList(ctx context.Context, sc *cli.Subcommand, args []string) error {
 		return errors.Wrap(err, "invalid filter specification on command line")
 	}
 
-	abstractions, errors, err := endpoint.ListAbstractionsStreamed(ctx, q)
+	abstractions, errors, drainDone, err := endpoint.ListAbstractionsStreamed(ctx, q)
 	if err != nil {
 		return err // context clear by invocation of command
 	}
+	defer drainDone()
 
 	var line chainlock.L
 	var wg sync.WaitGroup

config/config.go

@@ -6,17 +6,23 @@ import (
 	"log/syslog"
 	"os"
 	"reflect"
-	"regexp"
-	"strconv"
 	"time"
 
 	"github.com/pkg/errors"
+	"github.com/robfig/cron/v3"
 	"github.com/zrepl/yaml-config"
 
 	"github.com/zrepl/zrepl/util/datasizeunit"
 	zfsprop "github.com/zrepl/zrepl/zfs/property"
 )
 
+type ParseFlags uint
+
+const (
+	ParseFlagsNone        ParseFlags = 0
+	ParseFlagsNoCertCheck ParseFlags = 1 << iota
+)
+
 type Config struct {
 	Jobs   []JobEnum `yaml:"jobs"`
 	Global *Global   `yaml:"global,optional,fromdefaults"`
@@ -55,12 +61,17 @@ func (j JobEnum) Name() string {
 }
 
 type ActiveJob struct {
-	Type        string                `yaml:"type"`
-	Name        string                `yaml:"name"`
-	Connect     ConnectEnum           `yaml:"connect"`
-	Pruning     PruningSenderReceiver `yaml:"pruning"`
-	Debug       JobDebugSettings      `yaml:"debug,optional"`
-	Replication *Replication          `yaml:"replication,optional,fromdefaults"`
+	Type               string                `yaml:"type"`
+	Name               string                `yaml:"name"`
+	Connect            ConnectEnum           `yaml:"connect"`
+	Pruning            PruningSenderReceiver `yaml:"pruning"`
+	Debug              JobDebugSettings      `yaml:"debug,optional"`
+	Replication        *Replication          `yaml:"replication,optional,fromdefaults"`
+	ConflictResolution *ConflictResolution   `yaml:"conflict_resolution,optional,fromdefaults"`
+}
+
+type ConflictResolution struct {
+	InitialReplication string `yaml:"initial_replication,optional,default=most_recent"`
 }
 
 type PassiveJob struct {
@@ -177,13 +188,10 @@ func (i *PositiveDurationOrManual) UnmarshalYAML(u func(interface{}, bool) error
 		return fmt.Errorf("value must not be empty")
 	default:
 		i.Manual = false
-		i.Interval, err = time.ParseDuration(s)
+		i.Interval, err = parsePositiveDuration(s)
 		if err != nil {
 			return err
 		}
-		if i.Interval <= 0 {
-			return fmt.Errorf("value must be a positive duration, got %q", s)
-		}
 	}
 	return nil
 }
@@ -215,10 +223,44 @@ type SnapshottingEnum struct {
 }
 
 type SnapshottingPeriodic struct {
-	Type     string        `yaml:"type"`
-	Prefix   string        `yaml:"prefix"`
-	Interval time.Duration `yaml:"interval,positive"`
-	Hooks    HookList      `yaml:"hooks,optional"`
+	Type            string            `yaml:"type"`
+	Prefix          string            `yaml:"prefix"`
+	Interval        *PositiveDuration `yaml:"interval"`
+	Hooks           HookList          `yaml:"hooks,optional"`
+	TimestampFormat string            `yaml:"timestamp_format,optional,default=dense"`
+}
+
+type CronSpec struct {
+	Schedule cron.Schedule
+}
+
+var _ yaml.Unmarshaler = &CronSpec{}
+
+func (s *CronSpec) UnmarshalYAML(unmarshal func(v interface{}, not_strict bool) error) error {
+	var specString string
+	if err := unmarshal(&specString, false); err != nil {
+		return err
+	}
+
+	// Use standard cron format.
+	// Disable the various "descriptors" (@daily, etc)
+	// They are just aliases to "top of hour", "midnight", etc.
+	parser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.SecondOptional)
+
+	sched, err := parser.Parse(specString)
+	if err != nil {
+		return errors.Wrap(err, "cron syntax invalid")
+	}
+	s.Schedule = sched
+	return nil
+}
+
+type SnapshottingCron struct {
+	Type            string   `yaml:"type"`
+	Prefix          string   `yaml:"prefix"`
+	Cron            CronSpec `yaml:"cron"`
+	Hooks           HookList `yaml:"hooks,optional"`
+	TimestampFormat string   `yaml:"timestamp_format,optional,default=dense"`
 }
 
 type SnapshottingManual struct {
@@ -544,6 +586,7 @@ func (t *SnapshottingEnum) UnmarshalYAML(u func(interface{}, bool) error) (err e
 	t.Ret, err = enumUnmarshal(u, map[string]interface{}{
 		"periodic": &SnapshottingPeriodic{},
 		"manual":   &SnapshottingManual{},
+		"cron":     &SnapshottingCron{},
 	})
 	return
 }
@@ -669,41 +712,3 @@ func ParseConfigBytes(bytes []byte) (*Config, error) {
 	}
 	return c, nil
 }
-
-var durationStringRegex *regexp.Regexp = regexp.MustCompile(`^\s*(\d+)\s*(s|m|h|d|w)\s*$`)
-
-func parsePositiveDuration(e string) (d time.Duration, err error) {
-	comps := durationStringRegex.FindStringSubmatch(e)
-	if len(comps) != 3 {
-		err = fmt.Errorf("does not match regex: %s %#v", e, comps)
-		return
-	}
-
-	durationFactor, err := strconv.ParseInt(comps[1], 10, 64)
-	if err != nil {
-		return 0, err
-	}
-	if durationFactor <= 0 {
-		return 0, errors.New("duration must be positive integer")
-	}
-
-	var durationUnit time.Duration
-	switch comps[2] {
-	case "s":
-		durationUnit = time.Second
-	case "m":
-		durationUnit = time.Minute
-	case "h":
-		durationUnit = time.Hour
-	case "d":
-		durationUnit = 24 * time.Hour
-	case "w":
-		durationUnit = 24 * 7 * time.Hour
-	default:
-		err = fmt.Errorf("contains unknown time unit '%s'", comps[2])
-		return
-	}
-
-	d = time.Duration(durationFactor) * durationUnit
-	return
-}

config/config_duration.go

@@ -0,0 +1,106 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+	"time"
+
+	"github.com/kr/pretty"
+	"github.com/zrepl/yaml-config"
+)
+
+type Duration struct{ d time.Duration }
+
+func (d Duration) Duration() time.Duration { return d.d }
+
+var _ yaml.Unmarshaler = &Duration{}
+
+func (d *Duration) UnmarshalYAML(unmarshal func(v interface{}, not_strict bool) error) error {
+	var s string
+	err := unmarshal(&s, false)
+	if err != nil {
+		return err
+	}
+	d.d, err = parseDuration(s)
+	if err != nil {
+		d.d = 0
+		return &yaml.TypeError{Errors: []string{fmt.Sprintf("cannot parse value %q: %s", s, err)}}
+	}
+	return nil
+}
+
+type PositiveDuration struct{ d Duration }
+
+var _ yaml.Unmarshaler = &PositiveDuration{}
+
+func (d PositiveDuration) Duration() time.Duration { return d.d.Duration() }
+
+func (d *PositiveDuration) UnmarshalYAML(unmarshal func(v interface{}, not_strict bool) error) error {
+	err := d.d.UnmarshalYAML(unmarshal)
+	if err != nil {
+		return err
+	}
+	if d.d.Duration() <= 0 {
+		return fmt.Errorf("duration must be positive, got %s", d.d.Duration())
+	}
+	return nil
+}
+
+func parsePositiveDuration(e string) (time.Duration, error) {
+	d, err := parseDuration(e)
+	if err != nil {
+		return d, err
+	}
+	if d <= 0 {
+		return 0, errors.New("duration must be positive integer")
+	}
+	return d, err
+}
+
+var durationStringRegex *regexp.Regexp = regexp.MustCompile(`^\s*([\+-]?\d+)\s*(|s|m|h|d|w)\s*$`)
+
+func parseDuration(e string) (d time.Duration, err error) {
+	comps := durationStringRegex.FindStringSubmatch(e)
+	if comps == nil {
+		err = fmt.Errorf("must match %s", durationStringRegex)
+		return
+	}
+	if len(comps) != 3 {
+		panic(pretty.Sprint(comps))
+	}
+
+	durationFactor, err := strconv.ParseInt(comps[1], 10, 64)
+	if err != nil {
+		return 0, err
+	}
+
+	var durationUnit time.Duration
+	switch comps[2] {
+	case "":
+		if durationFactor != 0 {
+			err = fmt.Errorf("missing time unit")
+			return
+		} else {
+			// It's the case where user specified '0'.
+			// We want to allow this, just like time.ParseDuration.
+		}
+	case "s":
+		durationUnit = time.Second
+	case "m":
+		durationUnit = time.Minute
+	case "h":
+		durationUnit = time.Hour
+	case "d":
+		durationUnit = 24 * time.Hour
+	case "w":
+		durationUnit = 24 * 7 * time.Hour
+	default:
+		err = fmt.Errorf("contains unknown time unit '%s'", comps[2])
+		return
+	}
+
+	d = time.Duration(durationFactor) * durationUnit
+	return
+}

config/config_snapshotting_test.go

@@ -35,8 +35,23 @@ jobs:
   snapshotting:
     type: periodic
     prefix: zrepl_
+    timestamp_format: dense
     interval: 10m
 `
+	cron := `
+  snapshotting:
+    type: cron
+    prefix: zrepl_
+    timestamp_format: human
+    cron: "10 * * * *"
+`
+
+	periodicDaily := `
+  snapshotting:
+    type: periodic
+    prefix: zrepl_
+    interval: 1d
+`
 
 	hooks := `
   snapshotting:
@@ -74,10 +89,27 @@ jobs:
 		c = testValidConfig(t, fillSnapshotting(periodic))
 		snp := c.Jobs[0].Ret.(*PushJob).Snapshotting.Ret.(*SnapshottingPeriodic)
 		assert.Equal(t, "periodic", snp.Type)
-		assert.Equal(t, 10*time.Minute, snp.Interval)
+		assert.Equal(t, 10*time.Minute, snp.Interval.Duration())
 		assert.Equal(t, "zrepl_", snp.Prefix)
 	})
 
+	t.Run("periodicDaily", func(t *testing.T) {
+		c = testValidConfig(t, fillSnapshotting(periodicDaily))
+		snp := c.Jobs[0].Ret.(*PushJob).Snapshotting.Ret.(*SnapshottingPeriodic)
+		assert.Equal(t, "periodic", snp.Type)
+		assert.Equal(t, 24*time.Hour, snp.Interval.Duration())
+		assert.Equal(t, "zrepl_", snp.Prefix)
+		assert.Equal(t, "dense", snp.TimestampFormat)
+	})
+
+	t.Run("cron", func(t *testing.T) {
+		c = testValidConfig(t, fillSnapshotting(cron))
+		snp := c.Jobs[0].Ret.(*PushJob).Snapshotting.Ret.(*SnapshottingCron)
+		assert.Equal(t, "cron", snp.Type)
+		assert.Equal(t, "zrepl_", snp.Prefix)
+		assert.Equal(t, "human", snp.TimestampFormat)
+	})
+
 	t.Run("hooks", func(t *testing.T) {
 		c = testValidConfig(t, fillSnapshotting(hooks))
 		hs := c.Jobs[0].Ret.(*PushJob).Snapshotting.Ret.(*SnapshottingPeriodic).Hooks
@@ -88,3 +120,57 @@ jobs:
 	})
 
 }
+
+func TestSnapshottingTimestampDefaults(t *testing.T) {
+	tmpl := `
+jobs:
+- name: foo
+  type: push
+  connect:
+    type: local
+    listener_name: foo
+    client_identity: bar
+  filesystems: {"<": true}
+  %s
+  pruning:
+    keep_sender:
+    - type: last_n
+      count: 10
+    keep_receiver:
+    - type: last_n
+      count: 10
+`
+
+	periodic := `
+  snapshotting:
+    type: periodic
+    prefix: zrepl_
+    interval: 10m
+`
+	cron := `
+  snapshotting:
+    type: cron
+    prefix: zrepl_
+    cron: "10 * * * *"
+`
+
+	fillSnapshotting := func(s string) string { return fmt.Sprintf(tmpl, s) }
+	var c *Config
+
+	t.Run("periodic", func(t *testing.T) {
+		c = testValidConfig(t, fillSnapshotting(periodic))
+		snp := c.Jobs[0].Ret.(*PushJob).Snapshotting.Ret.(*SnapshottingPeriodic)
+		assert.Equal(t, "periodic", snp.Type)
+		assert.Equal(t, 10*time.Minute, snp.Interval.Duration())
+		assert.Equal(t, "zrepl_", snp.Prefix)
+		assert.Equal(t, "dense", snp.TimestampFormat) // default was set correctly
+	})
+
+	t.Run("cron", func(t *testing.T) {
+		c = testValidConfig(t, fillSnapshotting(cron))
+		snp := c.Jobs[0].Ret.(*PushJob).Snapshotting.Ret.(*SnapshottingCron)
+		assert.Equal(t, "cron", snp.Type)
+		assert.Equal(t, "zrepl_", snp.Prefix)
+		assert.Equal(t, "dense", snp.TimestampFormat) // default was set correctly
+	})
+}

config/config_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/kr/pretty"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"github.com/zrepl/yaml-config"
 )
 
 func TestSampleConfigsAreParsedWithoutErrors(t *testing.T) {
@@ -43,7 +44,8 @@ func TestSampleConfigsAreParsedWithoutErrors(t *testing.T) {
 }
 
 // template must be a template/text template with a single '{{ . }}' as placeholder for val
-//nolint[:deadcode,unused]
+//
+//nolint:deadcode,unused
 func testValidConfigTemplate(t *testing.T, tmpl string, val string) *Config {
 	tmp, err := template.New("master").Parse(tmpl)
 	if err != nil {
@@ -86,3 +88,53 @@ func TestTrimSpaceEachLineAndPad(t *testing.T) {
 	`
 	assert.Equal(t, "  \n  foo\n  bar baz\n  \n", trimSpaceEachLineAndPad(foo, "  "))
 }
+
+func TestCronSpec(t *testing.T) {
+
+	expectAccept := []string{
+		`"* * * * *"`,
+		`"0-10 * * * *"`,
+		`"* 0-5,8,12 * * *"`,
+	}
+
+	expectFail := []string{
+		`* * * *`,
+		``,
+		`23`,
+		`"@reboot"`,
+		`"@every 1h30m"`,
+		`"@daily"`,
+		`* * * * * *`,
+	}
+
+	for _, input := range expectAccept {
+		t.Run(input, func(t *testing.T) {
+			s := fmt.Sprintf("spec: %s\n", input)
+			var v struct {
+				Spec CronSpec
+			}
+			v.Spec.Schedule = nil
+			t.Logf("input:\n%s", s)
+			err := yaml.UnmarshalStrict([]byte(s), &v)
+			t.Logf("error: %T %s", err, err)
+			require.NoError(t, err)
+			require.NotNil(t, v.Spec.Schedule)
+		})
+	}
+
+	for _, input := range expectFail {
+		t.Run(input, func(t *testing.T) {
+			s := fmt.Sprintf("spec: %s\n", input)
+			var v struct {
+				Spec CronSpec
+			}
+			v.Spec.Schedule = nil
+			t.Logf("input: %q", s)
+			err := yaml.UnmarshalStrict([]byte(s), &v)
+			t.Logf("error: %T %s", err, err)
+			require.Error(t, err)
+			require.Nil(t, v.Spec.Schedule)
+		})
+	}
+
+}

config/samples/quickstart_continuous_server_backup_receiver.yml

@@ -9,7 +9,4 @@ jobs:
       key: "/etc/zrepl/backups.key"
       client_cns:
         - "prod"
-  recv:
-    placeholder:
-      encryption: inherit # use 'off' if sender uses send.encrypted
   root_fs: "storage/zrepl/sink"

config/samples/quickstart_continuous_server_backup_sender.yml

@@ -9,8 +9,8 @@ jobs:
     key:  /etc/zrepl/prod.key
     server_cn: "backups"
   filesystems: {
-    "zroot/var/db": true,
-    "zroot/usr/home<": true,
+    "zroot<": true,
+    "zroot/var/tmp<": false,
     "zroot/usr/home/paranoid": false
   }
   snapshotting:

config/samples/quickstart_fan_out_replication_source.yml

@@ -0,0 +1,59 @@
+jobs:
+# Separate job for snapshots and pruning
+- name: snapshots
+  type: snap
+  filesystems:
+    'tank<': true # all filesystems
+  snapshotting:
+    type: periodic
+    prefix: zrepl_
+    interval: 10m
+  pruning:
+    keep:
+      # Keep non-zrepl snapshots
+      - type: regex
+        negate: true
+        regex: '^zrepl_'
+      # Time-based snapshot retention
+      - type: grid
+        grid: 1x1h(keep=all) | 24x1h | 30x1d | 12x30d
+        regex: '^zrepl_'
+
+# Source job for target B
+- name: target_b
+  type: source
+  serve:
+    type: tls
+    listen: :8888
+    ca: /etc/zrepl/b.example.com.crt
+    cert: /etc/zrepl/a.example.com.crt
+    key: /etc/zrepl/a.example.com.key
+    client_cns:
+      - b.example.com
+  filesystems:
+    'tank<': true # all filesystems
+  # Snapshots are handled by the separate snap job
+  snapshotting:
+    type: manual
+
+# Source job for target C
+- name: target_c
+  type: source
+  serve:
+    type: tls
+    listen: :8889
+    ca: /etc/zrepl/c.example.com.crt
+    cert: /etc/zrepl/a.example.com.crt
+    key: /etc/zrepl/a.example.com.key
+    client_cns:
+      - c.example.com
+  filesystems:
+    'tank<': true # all filesystems
+  # Snapshots are handled by the separate snap job
+  snapshotting:
+    type: manual
+
+# Source jobs for remaining targets. Each one should listen on a different port
+# and reference the correct certificate and client CN.
+# - name: target_c
+#   ...

config/samples/quickstart_fan_out_replication_target.yml

@@ -0,0 +1,30 @@
+jobs:
+# Pull from source server A
+- name: source_a
+  type: pull
+  connect:
+    type: tls
+    # Use the correct port for this specific client (eg. B is 8888, C is 8889, etc.)
+    address: a.example.com:8888
+    ca: /etc/zrepl/a.example.com.crt
+    # Use the correct key pair for this specific client
+    cert: /etc/zrepl/b.example.com.crt
+    key: /etc/zrepl/b.example.com.key
+    server_cn: a.example.com
+  root_fs: pool0/backup
+  interval: 10m
+  pruning:
+    keep_sender:
+      # Source does the pruning in its snap job
+      - type: regex
+        regex: '.*'
+    # Receiver-side pruning can be configured as desired on each target server
+    keep_receiver:
+      # Keep non-zrepl snapshots
+      - type: regex
+        negate: true
+        regex: '^zrepl_'
+      # Time-based snapshot retention
+      - type: grid
+        grid: 1x1h(keep=all) | 24x1h | 30x1d | 12x30d
+        regex: '^zrepl_'

config/samples/snap_cron.yml

@@ -0,0 +1,14 @@
+jobs:
+- name: snapjob
+  type: snap
+  filesystems: {
+    "tank<": true,
+  }
+  snapshotting:
+    type: cron
+    prefix: zrepl_snapjob_
+    cron: "*/5 * * * *"
+  pruning:
+    keep:
+      - type: last_n
+        count: 60

daemon/daemon.go

@@ -51,7 +51,7 @@ func Run(ctx context.Context, conf *config.Config) error {
 	}
 	outlets.Add(newPrometheusLogOutlet(), logger.Debug)
 
-	confJobs, err := job.JobsFromConfig(conf)
+	confJobs, err := job.JobsFromConfig(conf, config.ParseFlagsNone)
 	if err != nil {
 		return errors.Wrap(err, "cannot build jobs from config")
 	}

daemon/hooks/hook_docs.go

@@ -5,7 +5,7 @@
 //
 // This package also provides all supported hook type implementations and abstractions around them.
 //
-// Use For Other Kinds Of ExpectStepReports
+// # Use For Other Kinds Of ExpectStepReports
 //
 // This package REQUIRES REFACTORING before it can be used for other activities than snapshots, e.g. pre- and post-replication:
 //
@@ -15,7 +15,7 @@
 // The hook implementations should move out of this package.
 // However, there is a lot of tight coupling which to untangle isn't worth it ATM.
 //
-// How This Package Is Used By Package Snapper
+// # How This Package Is Used By Package Snapper
 //
 // Deserialize a config.List using ListFromConfig().
 // Then it MUST filter the list to only contain hooks for a particular filesystem using
@@ -30,5 +30,4 @@
 // Command hooks make it available in the environment variable ZREPL_DRYRUN.
 //
 // Plan.Report() can be called while Plan.Run() is executing to give an overview of plan execution progress (future use in "zrepl status").
-//
 package hooks

daemon/hooks/hook_type_command.go

@@ -93,7 +93,14 @@ func (r *CommandHookReport) String() string {
 		cmdLine.WriteString(fmt.Sprintf("%s'%s'", sep, a))
 	}
 
-	return fmt.Sprintf("command hook invocation: \"%s\"", cmdLine.String()) // no %q to make copy-pastable
+	var msg string
+	if r.Err == nil {
+		msg = "command hook"
+	} else {
+		msg = fmt.Sprintf("command hook failed with %q", r.Err)
+	}
+
+	return fmt.Sprintf("%s: \"%s\"", msg, cmdLine.String()) // no %q to make copy-pastable
 }
 func (r *CommandHookReport) Error() string {
 	if r.Err == nil {

daemon/hooks/hook_type_mysql_lock_tables.go

@@ -17,19 +17,22 @@ import (
 	"github.com/zrepl/zrepl/zfs"
 )
 
+// Hook to implement the following recommmendation from MySQL docs
 // https://dev.mysql.com/doc/mysql-backup-excerpt/5.7/en/backup-methods.html
 //
-// Making Backups Using a File System Snapshot:
+//	Making Backups Using a File System Snapshot:
 //
-//  If you are using a Veritas file system, you can make a backup like this:
+//	If you are using a Veritas file system, you can make a backup like this:
 //
-//    	From a client program, execute FLUSH TABLES WITH READ LOCK.
-//    	From another shell, execute mount vxfs snapshot.
-//    	From the first client, execute UNLOCK TABLES.
-//    	Copy files from the snapshot.
-//    	Unmount the snapshot.
+//	   	From a client program, execute FLUSH TABLES WITH READ LOCK.
+//	   	From another shell, execute mount vxfs snapshot.
+//	   	From the first client, execute UNLOCK TABLES.
+//	   	Copy files from the snapshot.
+//	   	Unmount the snapshot.
 //
-//	Similar snapshot capabilities may be available in other file systems, such as LVM or ZFS.
+//		Similar snapshot capabilities may be available in other file systems, such as LVM or ZFS.
+//
+
 type MySQLLockTables struct {
 	errIsFatal  bool
 	connector   sqldriver.Connector

daemon/hooks/hooks_test.go

@@ -161,7 +161,7 @@ jobs:
 					ExpectedEdge: hooks.Pre,
 					ExpectStatus: hooks.StepErr,
 					OutputTest:   containsTest(fmt.Sprintf("TEST ERROR pre_testing %s@%s", testFSName, testSnapshotName)),
-					ErrorTest:    regexpTest("^command hook invocation.*exit status 1$"),
+					ErrorTest:    regexpTest("^command hook failed.*exit status 1$"),
 				},
 				expectStep{ExpectedEdge: hooks.Callback, ExpectStatus: hooks.StepOk},
 				expectStep{
@@ -185,7 +185,7 @@ jobs:
 					ExpectedEdge: hooks.Pre,
 					ExpectStatus: hooks.StepErr,
 					OutputTest:   containsTest(fmt.Sprintf("TEST ERROR pre_testing %s@%s", testFSName, testSnapshotName)),
-					ErrorTest:    regexpTest("^command hook invocation.*exit status 1$"),
+					ErrorTest:    regexpTest("^command hook failed.*exit status 1$"),
 				},
 				expectStep{
 					ExpectedEdge: hooks.Pre,
@@ -234,7 +234,7 @@ jobs:
 					ExpectedEdge: hooks.Post,
 					ExpectStatus: hooks.StepErr,
 					OutputTest:   containsTest(fmt.Sprintf("TEST ERROR post_testing %s@%s", testFSName, testSnapshotName)),
-					ErrorTest:    regexpTest("^command hook invocation.*exit status 1$"),
+					ErrorTest:    regexpTest("^command hook failed.*exit status 1$"),
 				},
 			},
 		},
@@ -267,7 +267,7 @@ jobs:
 					ExpectedEdge: hooks.Pre,
 					ExpectStatus: hooks.StepErr,
 					OutputTest:   containsTest(fmt.Sprintf("TEST ERROR pre_testing %s@%s", testFSName, testSnapshotName)),
-					ErrorTest:    regexpTest("^command hook invocation.*exit status 1$"),
+					ErrorTest:    regexpTest("^command hook failed.*exit status 1$"),
 				},
 				expectStep{ExpectedEdge: hooks.Callback, ExpectStatus: hooks.StepOk},
 				expectStep{
@@ -295,7 +295,7 @@ jobs:
 					ExpectedEdge: hooks.Pre,
 					ExpectStatus: hooks.StepErr,
 					OutputTest:   containsTest(fmt.Sprintf("TEST ERROR pre_testing %s@%s", testFSName, testSnapshotName)),
-					ErrorTest:    regexpTest("^command hook invocation.*exit status 1$"),
+					ErrorTest:    regexpTest("^command hook failed.*exit status 1$"),
 				},
 				expectStep{ExpectedEdge: hooks.Callback, ExpectStatus: hooks.StepOk},
 				expectStep{

daemon/job/active.go

@@ -101,7 +101,7 @@ type modePush struct {
 	receiver      *rpc.Client
 	senderConfig  *endpoint.SenderConfig
 	plannerPolicy *logic.PlannerPolicy
-	snapper       *snapper.PeriodicOrManual
+	snapper       snapper.Snapper
 }
 
 func (m *modePush) ConnectEndpoints(ctx context.Context, connecter transport.Connecter) {
@@ -137,7 +137,8 @@ func (m *modePush) RunPeriodic(ctx context.Context, wakeUpCommon chan<- struct{}
 }
 
 func (m *modePush) SnapperReport() *snapper.Report {
-	return m.snapper.Report()
+	r := m.snapper.Report()
+	return &r
 }
 
 func (m *modePush) ResetConnectBackoff() {
@@ -162,8 +163,13 @@ func modePushFromConfig(g *config.Global, in *config.PushJob, jobID endpoint.Job
 		return nil, errors.Wrap(err, "field `replication`")
 	}
 
+	conflictResolution, err := logic.ConflictResolutionFromConfig(in.ConflictResolution)
+	if err != nil {
+		return nil, errors.Wrap(err, "field `conflict_resolution`")
+	}
+
 	m.plannerPolicy = &logic.PlannerPolicy{
-		EncryptedSend:             logic.TriFromBool(in.Send.Encrypted),
+		ConflictResolution:        conflictResolution,
 		ReplicationConfig:         replicationConfig,
 		SizeEstimationConcurrency: in.Replication.Concurrency.SizeEstimates,
 	}
@@ -261,8 +267,13 @@ func modePullFromConfig(g *config.Global, in *config.PullJob, jobID endpoint.Job
 		return nil, errors.Wrap(err, "field `replication`")
 	}
 
+	conflictResolution, err := logic.ConflictResolutionFromConfig(in.ConflictResolution)
+	if err != nil {
+		return nil, errors.Wrap(err, "field `conflict_resolution`")
+	}
+
 	m.plannerPolicy = &logic.PlannerPolicy{
-		EncryptedSend:             logic.DontCare,
+		ConflictResolution:        conflictResolution,
 		ReplicationConfig:         replicationConfig,
 		SizeEstimationConcurrency: in.Replication.Concurrency.SizeEstimates,
 	}
@@ -288,7 +299,7 @@ func replicationDriverConfigFromConfig(in *config.Replication) (c driver.Config,
 	return c, err
 }
 
-func activeSide(g *config.Global, in *config.ActiveJob, configJob interface{}) (j *ActiveSide, err error) {
+func activeSide(g *config.Global, in *config.ActiveJob, configJob interface{}, parseFlags config.ParseFlags) (j *ActiveSide, err error) {
 
 	j = &ActiveSide{}
 	j.name, err = endpoint.MakeJobID(in.Name)
@@ -337,7 +348,7 @@ func activeSide(g *config.Global, in *config.ActiveJob, configJob interface{}) (
 		ConstLabels: prometheus.Labels{"zrepl_job": j.name.String()},
 	})
 
-	j.connecter, err = fromconfig.ConnecterFromConfig(g, in.Connect)
+	j.connecter, err = fromconfig.ConnecterFromConfig(g, in.Connect, parseFlags)
 	if err != nil {
 		return nil, errors.Wrap(err, "cannot build client")
 	}

daemon/job/build_jobs.go

@@ -11,10 +11,10 @@ import (
 	"github.com/zrepl/zrepl/util/bandwidthlimit"
 )
 
-func JobsFromConfig(c *config.Config) ([]Job, error) {
+func JobsFromConfig(c *config.Config, parseFlags config.ParseFlags) ([]Job, error) {
 	js := make([]Job, len(c.Jobs))
 	for i := range c.Jobs {
-		j, err := buildJob(c.Global, c.Jobs[i])
+		j, err := buildJob(c.Global, c.Jobs[i], parseFlags)
 		if err != nil {
 			return nil, err
 		}
@@ -42,19 +42,19 @@ func JobsFromConfig(c *config.Config) ([]Job, error) {
 	return js, nil
 }
 
-func buildJob(c *config.Global, in config.JobEnum) (j Job, err error) {
+func buildJob(c *config.Global, in config.JobEnum, parseFlags config.ParseFlags) (j Job, err error) {
 	cannotBuildJob := func(e error, name string) (Job, error) {
 		return nil, errors.Wrapf(e, "cannot build job %q", name)
 	}
 	// FIXME prettify this
 	switch v := in.Ret.(type) {
 	case *config.SinkJob:
-		j, err = passiveSideFromConfig(c, &v.PassiveJob, v)
+		j, err = passiveSideFromConfig(c, &v.PassiveJob, v, parseFlags)
 		if err != nil {
 			return cannotBuildJob(err, v.Name)
 		}
 	case *config.SourceJob:
-		j, err = passiveSideFromConfig(c, &v.PassiveJob, v)
+		j, err = passiveSideFromConfig(c, &v.PassiveJob, v, parseFlags)
 		if err != nil {
 			return cannotBuildJob(err, v.Name)
 		}
@@ -64,12 +64,12 @@ func buildJob(c *config.Global, in config.JobEnum) (j Job, err error) {
 			return cannotBuildJob(err, v.Name)
 		}
 	case *config.PushJob:
-		j, err = activeSide(c, &v.ActiveJob, v)
+		j, err = activeSide(c, &v.ActiveJob, v, parseFlags)
 		if err != nil {
 			return cannotBuildJob(err, v.Name)
 		}
 	case *config.PullJob:
-		j, err = activeSide(c, &v.ActiveJob, v)
+		j, err = activeSide(c, &v.ActiveJob, v, parseFlags)
 		if err != nil {
 			return cannotBuildJob(err, v.Name)
 		}

daemon/job/build_jobs_test.go

@@ -11,7 +11,6 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/zrepl/zrepl/config"
-	"github.com/zrepl/zrepl/transport/tls"
 )
 
 func TestValidateReceivingSidesDoNotOverlap(t *testing.T) {
@@ -96,7 +95,7 @@ jobs:
 			conf, err := config.ParseConfigBytes([]byte(fill(c.jobName)))
 			require.NoError(t, err, "not expecting yaml-config to know about job ids")
 			require.NotNil(t, conf)
-			jobs, err := JobsFromConfig(conf)
+			jobs, err := JobsFromConfig(conf, config.ParseFlagsNone)
 
 			if c.valid {
 				assert.NoError(t, err)
@@ -153,8 +152,7 @@ func TestSampleConfigsAreBuiltWithoutErrors(t *testing.T) {
 			t.Logf("file: %s", p)
 			t.Log(pretty.Sprint(c))
 
-			tls.FakeCertificateLoading(t)
-			jobs, err := JobsFromConfig(c)
+			jobs, err := JobsFromConfig(c, config.ParseFlagsNoCertCheck)
 			t.Logf("jobs: %#v", jobs)
 			require.NoError(t, err)
 
@@ -299,7 +297,7 @@ jobs:
 			t.Logf("testing config:\n%s", cstr)
 			c, err := config.ParseConfigBytes([]byte(cstr))
 			require.NoError(t, err)
-			jobs, err := JobsFromConfig(c)
+			jobs, err := JobsFromConfig(c, config.ParseFlagsNone)
 			if ts.expectOk != nil {
 				require.NoError(t, err)
 				require.NotNil(t, c)

daemon/job/passive.go

@@ -58,7 +58,7 @@ func modeSinkFromConfig(g *config.Global, in *config.SinkJob, jobID endpoint.Job
 
 type modeSource struct {
 	senderConfig *endpoint.SenderConfig
-	snapper      *snapper.PeriodicOrManual
+	snapper      snapper.Snapper
 }
 
 func modeSourceFromConfig(g *config.Global, in *config.SourceJob, jobID endpoint.JobID) (m *modeSource, err error) {
@@ -88,10 +88,11 @@ func (m *modeSource) RunPeriodic(ctx context.Context) {
 }
 
 func (m *modeSource) SnapperReport() *snapper.Report {
-	return m.snapper.Report()
+	r := m.snapper.Report()
+	return &r
 }
 
-func passiveSideFromConfig(g *config.Global, in *config.PassiveJob, configJob interface{}) (s *PassiveSide, err error) {
+func passiveSideFromConfig(g *config.Global, in *config.PassiveJob, configJob interface{}, parseFlags config.ParseFlags) (s *PassiveSide, err error) {
 
 	s = &PassiveSide{}
 
@@ -110,7 +111,7 @@ func passiveSideFromConfig(g *config.Global, in *config.PassiveJob, configJob in
 		return nil, err // no wrapping necessary
 	}
 
-	if s.listen, err = fromconfig.ListenerFactoryFromConfig(g, in.Serve); err != nil {
+	if s.listen, err = fromconfig.ListenerFactoryFromConfig(g, in.Serve, parseFlags); err != nil {
 		return nil, errors.Wrap(err, "cannot build listener factory")
 	}
 

daemon/job/snapjob.go

@@ -26,7 +26,7 @@ import (
 type SnapJob struct {
 	name     endpoint.JobID
 	fsfilter zfs.DatasetFilter
-	snapper  *snapper.PeriodicOrManual
+	snapper  snapper.Snapper
 
 	prunerFactory *pruner.LocalPrunerFactory
 
@@ -86,7 +86,8 @@ func (j *SnapJob) Status() *Status {
 		s.Pruning = j.pruner.Report()
 	}
 	j.prunerMtx.Unlock()
-	s.Snapshotting = j.snapper.Report()
+	r := j.snapper.Report()
+	s.Snapshotting = &r
 	return &Status{Type: t, JobSpecific: s}
 }
 
@@ -137,7 +138,7 @@ outer:
 // TODO:
 // This is a work-around for the current package daemon/pruner
 // and package pruning.Snapshot limitation: they require the
-//  `Replicated` getter method be present, but obviously,
+// `Replicated` getter method be present, but obviously,
 // a local job like SnapJob can't deliver on that.
 // But the pruner.Pruner gives up on an FS if no replication
 // cursor is present, which is why this pruner returns the

daemon/logging/trace/trace.go

@@ -1,6 +1,6 @@
 // package trace provides activity tracing via ctx through Tasks and Spans
 //
-// Basic Concepts
+// # Basic Concepts
 //
 // Tracing can be used to identify where a piece of code spends its time.
 //
@@ -10,51 +10,50 @@
 // to tech-savvy users (albeit not developers).
 //
 // This package provides the concept of Tasks and Spans to express what activity is happening within an application:
-//
-//  - Neither task nor span is really tangible but instead contained within the context.Context tree
-//  - Tasks represent concurrent activity (i.e. goroutines).
-//  - Spans represent a semantic stack trace within a task.
-//
+// - Neither task nor span is really tangible but instead contained within the context.Context tree
+// - Tasks represent concurrent activity (i.e. goroutines).
+// - Spans represent a semantic stack trace within a task.
 // As a consequence, whenever a context is propagated across goroutine boundary, you need to create a child task:
 //
-//   go func(ctx context.Context) {
-//     ctx, endTask = WithTask(ctx, "what-happens-inside-the-child-task")
-//     defer endTask()
-//     // ...
-//   }(ctx)
+//	go func(ctx context.Context) {
+//	  ctx, endTask = WithTask(ctx, "what-happens-inside-the-child-task")
+//	  defer endTask()
+//	  // ...
+//	}(ctx)
 //
 // Within the task, you can open up a hierarchy of spans.
 // In contrast to tasks, which have can multiple concurrently running child tasks,
 // spans must nest and not cross the goroutine boundary.
 //
-//  ctx, endSpan = WithSpan(ctx, "copy-dir")
-//  defer endSpan()
-//  for _, f := range dir.Files() {
-//    func() {
-//      ctx, endSpan := WithSpan(ctx, fmt.Sprintf("copy-file %q", f))
-//      defer endspan()
-//      b, _ := ioutil.ReadFile(f)
-//      _ = ioutil.WriteFile(f + ".copy", b, 0600)
-//    }()
-//  }
+//	ctx, endSpan = WithSpan(ctx, "copy-dir")
+//	defer endSpan()
+//	for _, f := range dir.Files() {
+//	  func() {
+//	    ctx, endSpan := WithSpan(ctx, fmt.Sprintf("copy-file %q", f))
+//	    defer endspan()
+//	    b, _ := ioutil.ReadFile(f)
+//	    _ = ioutil.WriteFile(f + ".copy", b, 0600)
+//	  }()
+//	}
 //
 // In combination:
-//  ctx, endTask = WithTask(ctx, "copy-dirs")
-//  defer endTask()
-//  for i := range dirs {
-//    go func(dir string) {
-//      ctx, endTask := WithTask(ctx, "copy-dir")
-//      defer endTask()
-//      for _, f := range filesIn(dir) {
-//        func() {
-//          ctx, endSpan := WithSpan(ctx, fmt.Sprintf("copy-file %q", f))
-//          defer endspan()
-//          b, _ := ioutil.ReadFile(f)
-//          _ = ioutil.WriteFile(f + ".copy", b, 0600)
-//        }()
-//      }
-//    }()
-//  }
+//
+//	ctx, endTask = WithTask(ctx, "copy-dirs")
+//	defer endTask()
+//	for i := range dirs {
+//	  go func(dir string) {
+//	    ctx, endTask := WithTask(ctx, "copy-dir")
+//	    defer endTask()
+//	    for _, f := range filesIn(dir) {
+//	      func() {
+//	        ctx, endSpan := WithSpan(ctx, fmt.Sprintf("copy-file %q", f))
+//	        defer endspan()
+//	        b, _ := ioutil.ReadFile(f)
+//	        _ = ioutil.WriteFile(f + ".copy", b, 0600)
+//	      }()
+//	    }
+//	  }()
+//	}
 //
 // Note that a span ends at the time you call endSpan - not before and not after that.
 // If you violate the stack-like nesting of spans by forgetting an endSpan() invocation,
@@ -65,8 +64,7 @@
 //
 // Recovering from endSpan() or endTask() panics will corrupt the trace stack and lead to corrupt tracefile output.
 //
-//
-// Best Practices For Naming Tasks And Spans
+// # Best Practices For Naming Tasks And Spans
 //
 // Tasks should always have string constants as names, and must not contain the `#` character. WHy?
 // First, the visualization by chrome://tracing draws a horizontal bar for each task in the trace.
@@ -74,8 +72,7 @@
 // Note that the `#NUM` suffix will be reused if a task has ended, in order to avoid an
 // infinite number of horizontal bars in the visualization.
 //
-//
-// Chrome-compatible Tracefile Support
+// # Chrome-compatible Tracefile Support
 //
 // The activity trace generated by usage of WithTask and WithSpan can be rendered to a JSON output file
 // that can be loaded into chrome://tracing .

daemon/logging/trace/trace_convenience.go

@@ -11,8 +11,6 @@ import (
 // use like this:
 //
 //	defer WithSpanFromStackUpdateCtx(&existingCtx)()
-//
-//
 func WithSpanFromStackUpdateCtx(ctx *context.Context) DoneFunc {
 	childSpanCtx, end := WithSpan(*ctx, getMyCallerOrPanic())
 	*ctx = childSpanCtx

daemon/snapper/cron.go

@@ -0,0 +1,152 @@
+package snapper
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/pkg/errors"
+
+	"github.com/zrepl/zrepl/config"
+	"github.com/zrepl/zrepl/daemon/hooks"
+	"github.com/zrepl/zrepl/util/suspendresumesafetimer"
+	"github.com/zrepl/zrepl/zfs"
+)
+
+func cronFromConfig(fsf zfs.DatasetFilter, in config.SnapshottingCron) (*Cron, error) {
+
+	hooksList, err := hooks.ListFromConfig(&in.Hooks)
+	if err != nil {
+		return nil, errors.Wrap(err, "hook config error")
+	}
+	planArgs := planArgs{
+		prefix:          in.Prefix,
+		timestampFormat: in.TimestampFormat,
+		hooks:           hooksList,
+	}
+	return &Cron{config: in, fsf: fsf, planArgs: planArgs}, nil
+}
+
+type Cron struct {
+	config   config.SnapshottingCron
+	fsf      zfs.DatasetFilter
+	planArgs planArgs
+
+	mtx sync.RWMutex
+
+	running                 bool
+	wakeupTime              time.Time // zero value means uninit
+	lastError               error
+	lastPlan                *plan
+	wakeupWhileRunningCount int
+}
+
+func (s *Cron) Run(ctx context.Context, snapshotsTaken chan<- struct{}) {
+
+	for {
+		now := time.Now()
+		s.mtx.Lock()
+		s.wakeupTime = s.config.Cron.Schedule.Next(now)
+		s.mtx.Unlock()
+
+		ctxDone := suspendresumesafetimer.SleepUntil(ctx, s.wakeupTime)
+		if ctxDone != nil {
+			return
+		}
+
+		getLogger(ctx).Debug("cron timer fired")
+		s.mtx.Lock()
+		if s.running {
+			getLogger(ctx).Warn("snapshotting triggered according to cron rules but previous snapshotting is not done; not taking a snapshot this time")
+			s.wakeupWhileRunningCount++
+			s.mtx.Unlock()
+			continue
+		}
+		s.lastError = nil
+		s.lastPlan = nil
+		s.wakeupWhileRunningCount = 0
+		s.running = true
+		s.mtx.Unlock()
+		go func() {
+			err := s.do(ctx)
+			s.mtx.Lock()
+			s.lastError = err
+			s.running = false
+			s.mtx.Unlock()
+
+			select {
+			case snapshotsTaken <- struct{}{}:
+			default:
+				if snapshotsTaken != nil {
+					getLogger(ctx).Warn("callback channel is full, discarding snapshot update event")
+				}
+			}
+		}()
+	}
+
+}
+
+func (s *Cron) do(ctx context.Context) error {
+	fss, err := zfs.ZFSListMapping(ctx, s.fsf)
+	if err != nil {
+		return errors.Wrap(err, "cannot list filesystems")
+	}
+	p := makePlan(s.planArgs, fss)
+
+	s.mtx.Lock()
+	s.lastPlan = p
+	s.lastError = nil
+	s.mtx.Unlock()
+
+	ok := p.execute(ctx, false)
+	if !ok {
+		return errors.New("one or more snapshots could not be created, check logs for details")
+	} else {
+		return nil
+	}
+}
+
+type CronState string
+
+const (
+	CronStateRunning CronState = "running"
+	CronStateWaiting CronState = "waiting"
+)
+
+type CronReport struct {
+	State      CronState
+	WakeupTime time.Time
+	Errors     []string
+	Progress   []*ReportFilesystem
+}
+
+func (s *Cron) Report() Report {
+
+	s.mtx.Lock()
+	defer s.mtx.Unlock()
+
+	r := CronReport{}
+
+	r.WakeupTime = s.wakeupTime
+
+	if s.running {
+		r.State = CronStateRunning
+	} else {
+		r.State = CronStateWaiting
+	}
+
+	if s.lastError != nil {
+		r.Errors = append(r.Errors, s.lastError.Error())
+	}
+	if s.wakeupWhileRunningCount > 0 {
+		r.Errors = append(r.Errors, fmt.Sprintf("cron frequency is too high; snapshots were not taken %d times", s.wakeupWhileRunningCount))
+	}
+
+	r.Progress = nil
+	if s.lastPlan != nil {
+		r.Progress = s.lastPlan.report()
+	}
+
+	return Report{Type: TypeCron, Cron: &r}
+}

daemon/snapper/cron_test.go

@@ -0,0 +1,68 @@
+package snapper
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/zrepl/yaml-config"
+
+	"github.com/zrepl/zrepl/config"
+)
+
+func TestCronLibraryWorks(t *testing.T) {
+
+	type testCase struct {
+		spec   string
+		in     time.Time
+		expect time.Time
+	}
+	dhm := func(day, hour, minutes int) time.Time {
+		return time.Date(2022, 7, day, hour, minutes, 0, 0, time.UTC)
+	}
+	hm := func(hour, minutes int) time.Time {
+		return dhm(23, hour, minutes)
+	}
+
+	tcs := []testCase{
+		{"0-10 * * * *", dhm(17, 1, 10), dhm(17, 2, 0)},
+		{"0-10 * * * *", dhm(17, 23, 10), dhm(18, 0, 0)},
+		{"0-10 * * * *", hm(1, 9), hm(1, 10)},
+		{"0-10 * * * *", hm(1, 9), hm(1, 10)},
+
+		{"1,3,5 * * * *", hm(1, 1), hm(1, 3)},
+		{"1,3,5 * * * *", hm(1, 2), hm(1, 3)},
+		{"1,3,5 * * * *", hm(1, 3), hm(1, 5)},
+		{"1,3,5 * * * *", hm(1, 5), hm(2, 1)},
+
+		{"* 0-5,8,12 * * *", hm(0, 0), hm(0, 1)},
+		{"* 0-5,8,12 * * *", hm(4, 59), hm(5, 0)},
+		{"* 0-5,8,12 * * *", hm(5, 0), hm(5, 1)},
+		{"* 0-5,8,12 * * *", hm(5, 59), hm(8, 0)},
+		{"* 0-5,8,12 * * *", hm(8, 59), hm(12, 0)},
+
+		// https://github.com/zrepl/zrepl/pull/614#issuecomment-1188358989
+		{"53 17,18,19 * * *", dhm(23, 17, 52), dhm(23, 17, 53)},
+		{"53 17,18,19 * * *", dhm(23, 17, 53), dhm(23, 18, 53)},
+		{"53 17,18,19 * * *", dhm(23, 18, 53), dhm(23, 19, 53)},
+		{"53 17,18,19 * * *", dhm(23, 19, 53), dhm(24 /* ! */, 17, 53)},
+	}
+
+	for i, tc := range tcs {
+		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+			var s struct {
+				Cron config.CronSpec `yaml:"cron"`
+			}
+			inp := fmt.Sprintf("cron: %q", tc.spec)
+			fmt.Println("spec is ", inp)
+			err := yaml.UnmarshalStrict([]byte(inp), &s)
+			require.NoError(t, err)
+
+			actual := s.Cron.Schedule.Next(tc.in)
+			assert.Equal(t, tc.expect, actual)
+		})
+	}
+
+}

daemon/snapper/impl.go

@@ -0,0 +1,268 @@
+package snapper
+
+import (
+	"context"
+	"fmt"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/zrepl/zrepl/daemon/hooks"
+	"github.com/zrepl/zrepl/daemon/logging"
+	"github.com/zrepl/zrepl/util/chainlock"
+	"github.com/zrepl/zrepl/zfs"
+)
+
+type planArgs struct {
+	prefix          string
+	timestampFormat string
+	hooks           *hooks.List
+}
+
+type plan struct {
+	mtx   chainlock.L
+	args  planArgs
+	snaps map[*zfs.DatasetPath]*snapProgress
+}
+
+func makePlan(args planArgs, fss []*zfs.DatasetPath) *plan {
+	snaps := make(map[*zfs.DatasetPath]*snapProgress, len(fss))
+	for _, fs := range fss {
+		snaps[fs] = &snapProgress{state: SnapPending}
+	}
+	return &plan{snaps: snaps, args: args}
+}
+
+//go:generate stringer -type=SnapState
+type SnapState uint
+
+const (
+	SnapPending SnapState = 1 << iota
+	SnapStarted
+	SnapDone
+	SnapError
+)
+
+// All fields protected by Snapper.mtx
+type snapProgress struct {
+	state SnapState
+
+	// SnapStarted, SnapDone, SnapError
+	name     string
+	startAt  time.Time
+	hookPlan *hooks.Plan
+
+	// SnapDone
+	doneAt time.Time
+
+	// SnapErr TODO disambiguate state
+	runResults hooks.PlanReport
+}
+
+func (plan *plan) formatNow(format string) string {
+	now := time.Now().UTC()
+	switch strings.ToLower(format) {
+	case "dense":
+		format = "20060102_150405_000"
+	case "human":
+		format = "2006-01-02_15:04:05"
+	case "iso-8601":
+		format = "2006-01-02T15:04:05.000Z"
+	case "unix-seconds":
+		return strconv.FormatInt(now.Unix(), 10)
+	}
+	return now.Format(format)
+}
+
+func (plan *plan) execute(ctx context.Context, dryRun bool) (ok bool) {
+
+	hookMatchCount := make(map[hooks.Hook]int, len(*plan.args.hooks))
+	for _, h := range *plan.args.hooks {
+		hookMatchCount[h] = 0
+	}
+
+	anyFsHadErr := false
+	// TODO channel programs -> allow a little jitter?
+	for fs, progress := range plan.snaps {
+		suffix := plan.formatNow(plan.args.timestampFormat)
+		snapname := fmt.Sprintf("%s%s", plan.args.prefix, suffix)
+
+		ctx := logging.WithInjectedField(ctx, "fs", fs.ToString())
+		ctx = logging.WithInjectedField(ctx, "snap", snapname)
+
+		hookEnvExtra := hooks.Env{
+			hooks.EnvFS:       fs.ToString(),
+			hooks.EnvSnapshot: snapname,
+		}
+
+		jobCallback := hooks.NewCallbackHookForFilesystem("snapshot", fs, func(ctx context.Context) (err error) {
+			l := getLogger(ctx)
+			l.Debug("create snapshot")
+			err = zfs.ZFSSnapshot(ctx, fs, snapname, false) // TODO propagate context to ZFSSnapshot
+			if err != nil {
+				l.WithError(err).Error("cannot create snapshot")
+			}
+			return
+		})
+
+		fsHadErr := false
+		var hookPlanReport hooks.PlanReport
+		var hookPlan *hooks.Plan
+		{
+			filteredHooks, err := plan.args.hooks.CopyFilteredForFilesystem(fs)
+			if err != nil {
+				getLogger(ctx).WithError(err).Error("unexpected filter error")
+				fsHadErr = true
+				goto updateFSState
+			}
+			// account for running hooks
+			for _, h := range filteredHooks {
+				hookMatchCount[h] = hookMatchCount[h] + 1
+			}
+
+			var planErr error
+			hookPlan, planErr = hooks.NewPlan(&filteredHooks, hooks.PhaseSnapshot, jobCallback, hookEnvExtra)
+			if planErr != nil {
+				fsHadErr = true
+				getLogger(ctx).WithError(planErr).Error("cannot create job hook plan")
+				goto updateFSState
+			}
+		}
+
+		plan.mtx.HoldWhile(func() {
+			progress.name = snapname
+			progress.startAt = time.Now()
+			progress.hookPlan = hookPlan
+			progress.state = SnapStarted
+		})
+
+		{
+			getLogger(ctx).WithField("report", hookPlan.Report().String()).Debug("begin run job plan")
+			hookPlan.Run(ctx, dryRun)
+			hookPlanReport = hookPlan.Report()
+			fsHadErr = hookPlanReport.HadError() // not just fatal errors
+			if fsHadErr {
+				getLogger(ctx).WithField("report", hookPlanReport.String()).Error("end run job plan with error")
+			} else {
+				getLogger(ctx).WithField("report", hookPlanReport.String()).Info("end run job plan successful")
+			}
+		}
+
+	updateFSState:
+		anyFsHadErr = anyFsHadErr || fsHadErr
+		plan.mtx.HoldWhile(func() {
+			progress.doneAt = time.Now()
+			progress.state = SnapDone
+			if fsHadErr {
+				progress.state = SnapError
+			}
+			progress.runResults = hookPlanReport
+		})
+	}
+
+	for h, mc := range hookMatchCount {
+		if mc == 0 {
+			hookIdx := -1
+			for idx, ah := range *plan.args.hooks {
+				if ah == h {
+					hookIdx = idx
+					break
+				}
+			}
+			getLogger(ctx).WithField("hook", h.String()).WithField("hook_number", hookIdx+1).Warn("hook did not match any snapshotted filesystems")
+		}
+	}
+
+	return !anyFsHadErr
+}
+
+type ReportFilesystem struct {
+	Path  string
+	State SnapState
+
+	// Valid in SnapStarted and later
+	SnapName      string
+	StartAt       time.Time
+	Hooks         string
+	HooksHadError bool
+
+	// Valid in SnapDone | SnapError
+	DoneAt time.Time
+}
+
+func (plan *plan) report() []*ReportFilesystem {
+	plan.mtx.Lock()
+	defer plan.mtx.Unlock()
+
+	pReps := make([]*ReportFilesystem, 0, len(plan.snaps))
+	for fs, p := range plan.snaps {
+		var hooksStr string
+		var hooksHadError bool
+		if p.hookPlan != nil {
+			hooksStr, hooksHadError = p.report()
+		}
+		pReps = append(pReps, &ReportFilesystem{
+			Path:          fs.ToString(),
+			State:         p.state,
+			SnapName:      p.name,
+			StartAt:       p.startAt,
+			DoneAt:        p.doneAt,
+			Hooks:         hooksStr,
+			HooksHadError: hooksHadError,
+		})
+	}
+
+	sort.Slice(pReps, func(i, j int) bool {
+		return strings.Compare(pReps[i].Path, pReps[j].Path) == -1
+	})
+
+	return pReps
+}
+
+func (p *snapProgress) report() (hooksStr string, hooksHadError bool) {
+	hr := p.hookPlan.Report()
+	// FIXME: technically this belongs into client
+	// but we can't serialize hooks.Step ATM
+	rightPad := func(str string, length int, pad string) string {
+		if len(str) > length {
+			return str[:length]
+		}
+		return str + strings.Repeat(pad, length-len(str))
+	}
+	hooksHadError = hr.HadError()
+	rows := make([][]string, len(hr))
+	const numCols = 4
+	lens := make([]int, numCols)
+	for i, e := range hr {
+		rows[i] = make([]string, numCols)
+		rows[i][0] = fmt.Sprintf("%d", i+1)
+		rows[i][1] = e.Status.String()
+		runTime := "..."
+		if e.Status != hooks.StepPending {
+			runTime = e.End.Sub(e.Begin).Round(time.Millisecond).String()
+		}
+		rows[i][2] = runTime
+		rows[i][3] = ""
+		if e.Report != nil {
+			rows[i][3] = e.Report.String()
+		}
+		for j, col := range lens {
+			if len(rows[i][j]) > col {
+				lens[j] = len(rows[i][j])
+			}
+		}
+	}
+	rowsFlat := make([]string, len(hr))
+	for i, r := range rows {
+		colsPadded := make([]string, len(r))
+		for j, c := range r[:len(r)-1] {
+			colsPadded[j] = rightPad(c, lens[j], " ")
+		}
+		colsPadded[len(r)-1] = r[len(r)-1]
+		rowsFlat[i] = strings.Join(colsPadded, " ")
+	}
+	hooksStr = strings.Join(rowsFlat, "\n")
+
+	return hooksStr, hooksHadError
+}

daemon/snapper/manual.go

@@ -0,0 +1,15 @@
+package snapper
+
+import (
+	"context"
+)
+
+type manual struct{}
+
+func (s *manual) Run(ctx context.Context, wakeUpCommon chan<- struct{}) {
+	// nothing to do
+}
+
+func (s *manual) Report() Report {
+	return Report{Type: TypeManual, Manual: &struct{}{}}
+}

daemon/snapper/periodic.go

@@ -0,0 +1,394 @@
+package snapper
+
+import (
+	"context"
+	"fmt"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/pkg/errors"
+
+	"github.com/zrepl/zrepl/daemon/logging/trace"
+
+	"github.com/zrepl/zrepl/config"
+	"github.com/zrepl/zrepl/daemon/hooks"
+	"github.com/zrepl/zrepl/daemon/logging"
+	"github.com/zrepl/zrepl/util/envconst"
+	"github.com/zrepl/zrepl/util/suspendresumesafetimer"
+	"github.com/zrepl/zrepl/zfs"
+)
+
+func periodicFromConfig(g *config.Global, fsf zfs.DatasetFilter, in *config.SnapshottingPeriodic) (*Periodic, error) {
+	if in.Prefix == "" {
+		return nil, errors.New("prefix must not be empty")
+	}
+	if in.Interval.Duration() <= 0 {
+		return nil, errors.New("interval must be positive")
+	}
+
+	hookList, err := hooks.ListFromConfig(&in.Hooks)
+	if err != nil {
+		return nil, errors.Wrap(err, "hook config error")
+	}
+
+	args := periodicArgs{
+		interval: in.Interval.Duration(),
+		fsf:      fsf,
+		planArgs: planArgs{
+			prefix:          in.Prefix,
+			timestampFormat: in.TimestampFormat,
+			hooks:           hookList,
+		},
+		// ctx and log is set in Run()
+	}
+
+	return &Periodic{state: SyncUp, args: args}, nil
+}
+
+type periodicArgs struct {
+	ctx            context.Context
+	interval       time.Duration
+	fsf            zfs.DatasetFilter
+	planArgs       planArgs
+	snapshotsTaken chan<- struct{}
+	dryRun         bool
+}
+
+type Periodic struct {
+	args periodicArgs
+
+	mtx   sync.Mutex
+	state State
+
+	// set in state Plan, used in Waiting
+	lastInvocation time.Time
+
+	// valid for state Snapshotting
+	plan *plan
+
+	// valid for state SyncUp and Waiting
+	sleepUntil time.Time
+
+	// valid for state Err
+	err error
+}
+
+//go:generate stringer -type=State
+type State uint
+
+const (
+	SyncUp State = 1 << iota
+	SyncUpErrWait
+	Planning
+	Snapshotting
+	Waiting
+	ErrorWait
+	Stopped
+)
+
+func (s State) sf() state {
+	m := map[State]state{
+		SyncUp:        periodicStateSyncUp,
+		SyncUpErrWait: periodicStateWait,
+		Planning:      periodicStatePlan,
+		Snapshotting:  periodicStateSnapshot,
+		Waiting:       periodicStateWait,
+		ErrorWait:     periodicStateWait,
+		Stopped:       nil,
+	}
+	return m[s]
+}
+
+type updater func(u func(*Periodic)) State
+type state func(a periodicArgs, u updater) state
+
+func (s *Periodic) Run(ctx context.Context, snapshotsTaken chan<- struct{}) {
+	defer trace.WithSpanFromStackUpdateCtx(&ctx)()
+	getLogger(ctx).Debug("start")
+	defer getLogger(ctx).Debug("stop")
+
+	s.args.snapshotsTaken = snapshotsTaken
+	s.args.ctx = ctx
+	s.args.dryRun = false // for future expansion
+
+	u := func(u func(*Periodic)) State {
+		s.mtx.Lock()
+		defer s.mtx.Unlock()
+		if u != nil {
+			u(s)
+		}
+		return s.state
+	}
+
+	var st state = periodicStateSyncUp
+
+	for st != nil {
+		pre := u(nil)
+		st = st(s.args, u)
+		post := u(nil)
+		getLogger(ctx).
+			WithField("transition", fmt.Sprintf("%s=>%s", pre, post)).
+			Debug("state transition")
+
+	}
+
+}
+
+func onErr(err error, u updater) state {
+	return u(func(s *Periodic) {
+		s.err = err
+		preState := s.state
+		switch s.state {
+		case SyncUp:
+			s.state = SyncUpErrWait
+		case Planning:
+			fallthrough
+		case Snapshotting:
+			s.state = ErrorWait
+		}
+		getLogger(s.args.ctx).WithError(err).WithField("pre_state", preState).WithField("post_state", s.state).Error("snapshotting error")
+	}).sf()
+}
+
+func onMainCtxDone(ctx context.Context, u updater) state {
+	return u(func(s *Periodic) {
+		s.err = ctx.Err()
+		s.state = Stopped
+	}).sf()
+}
+
+func periodicStateSyncUp(a periodicArgs, u updater) state {
+	u(func(snapper *Periodic) {
+		snapper.lastInvocation = time.Now()
+	})
+	fss, err := listFSes(a.ctx, a.fsf)
+	if err != nil {
+		return onErr(err, u)
+	}
+	syncPoint, err := findSyncPoint(a.ctx, fss, a.planArgs.prefix, a.interval)
+	if err != nil {
+		return onErr(err, u)
+	}
+	u(func(s *Periodic) {
+		s.sleepUntil = syncPoint
+	})
+	ctxDone := suspendresumesafetimer.SleepUntil(a.ctx, syncPoint)
+	if ctxDone != nil {
+		return onMainCtxDone(a.ctx, u)
+	}
+	return u(func(s *Periodic) {
+		s.state = Planning
+	}).sf()
+}
+
+func periodicStatePlan(a periodicArgs, u updater) state {
+	u(func(snapper *Periodic) {
+		snapper.lastInvocation = time.Now()
+	})
+	fss, err := listFSes(a.ctx, a.fsf)
+	if err != nil {
+		return onErr(err, u)
+	}
+	p := makePlan(a.planArgs, fss)
+	return u(func(s *Periodic) {
+		s.state = Snapshotting
+		s.plan = p
+		s.err = nil
+	}).sf()
+}
+
+func periodicStateSnapshot(a periodicArgs, u updater) state {
+
+	var plan *plan
+	u(func(snapper *Periodic) {
+		plan = snapper.plan
+	})
+
+	ok := plan.execute(a.ctx, false)
+
+	select {
+	case a.snapshotsTaken <- struct{}{}:
+	default:
+		if a.snapshotsTaken != nil {
+			getLogger(a.ctx).Warn("callback channel is full, discarding snapshot update event")
+		}
+	}
+
+	return u(func(snapper *Periodic) {
+		if !ok {
+			snapper.state = ErrorWait
+			snapper.err = errors.New("one or more snapshots could not be created, check logs for details")
+		} else {
+			snapper.state = Waiting
+			snapper.err = nil
+		}
+	}).sf()
+}
+
+func periodicStateWait(a periodicArgs, u updater) state {
+	var sleepUntil time.Time
+	u(func(snapper *Periodic) {
+		lastTick := snapper.lastInvocation
+		snapper.sleepUntil = lastTick.Add(a.interval)
+		sleepUntil = snapper.sleepUntil
+		log := getLogger(a.ctx).WithField("sleep_until", sleepUntil).WithField("duration", a.interval)
+		logFunc := log.Debug
+		if snapper.state == ErrorWait || snapper.state == SyncUpErrWait {
+			logFunc = log.Error
+		}
+		logFunc("enter wait-state after error")
+	})
+
+	ctxDone := suspendresumesafetimer.SleepUntil(a.ctx, sleepUntil)
+	if ctxDone != nil {
+		return onMainCtxDone(a.ctx, u)
+	}
+	return u(func(snapper *Periodic) {
+		snapper.state = Planning
+	}).sf()
+}
+
+func listFSes(ctx context.Context, mf zfs.DatasetFilter) (fss []*zfs.DatasetPath, err error) {
+	return zfs.ZFSListMapping(ctx, mf)
+}
+
+var syncUpWarnNoSnapshotUntilSyncupMinDuration = envconst.Duration("ZREPL_SNAPPER_SYNCUP_WARN_MIN_DURATION", 1*time.Second)
+
+// see docs/snapshotting.rst
+func findSyncPoint(ctx context.Context, fss []*zfs.DatasetPath, prefix string, interval time.Duration) (syncPoint time.Time, err error) {
+
+	const (
+		prioHasVersions int = iota
+		prioNoVersions
+	)
+
+	type snapTime struct {
+		ds   *zfs.DatasetPath
+		prio int // lower is higher
+		time time.Time
+	}
+
+	if len(fss) == 0 {
+		return time.Now(), nil
+	}
+
+	snaptimes := make([]snapTime, 0, len(fss))
+	hardErrs := 0
+
+	now := time.Now()
+
+	getLogger(ctx).Debug("examine filesystem state to find sync point")
+	for _, d := range fss {
+		ctx := logging.WithInjectedField(ctx, "fs", d.ToString())
+		syncPoint, err := findSyncPointFSNextOptimalSnapshotTime(ctx, now, interval, prefix, d)
+		if err == findSyncPointFSNoFilesystemVersionsErr {
+			snaptimes = append(snaptimes, snapTime{
+				ds:   d,
+				prio: prioNoVersions,
+				time: now,
+			})
+		} else if err != nil {
+			hardErrs++
+			getLogger(ctx).WithError(err).Error("cannot determine optimal sync point for this filesystem")
+		} else {
+			getLogger(ctx).WithField("syncPoint", syncPoint).Debug("found optimal sync point for this filesystem")
+			snaptimes = append(snaptimes, snapTime{
+				ds:   d,
+				prio: prioHasVersions,
+				time: syncPoint,
+			})
+		}
+	}
+
+	if hardErrs == len(fss) {
+		return time.Time{}, fmt.Errorf("hard errors in determining sync point for every matching filesystem")
+	}
+
+	if len(snaptimes) == 0 {
+		panic("implementation error: loop must either inc hardErrs or add result to snaptimes")
+	}
+
+	// sort ascending by (prio,time)
+	// => those filesystems with versions win over those without any
+	sort.Slice(snaptimes, func(i, j int) bool {
+		if snaptimes[i].prio == snaptimes[j].prio {
+			return snaptimes[i].time.Before(snaptimes[j].time)
+		}
+		return snaptimes[i].prio < snaptimes[j].prio
+	})
+
+	winnerSyncPoint := snaptimes[0].time
+	l := getLogger(ctx).WithField("syncPoint", winnerSyncPoint.String())
+	l.Info("determined sync point")
+	if winnerSyncPoint.Sub(now) > syncUpWarnNoSnapshotUntilSyncupMinDuration {
+		for _, st := range snaptimes {
+			if st.prio == prioNoVersions {
+				l.WithField("fs", st.ds.ToString()).Warn("filesystem will not be snapshotted until sync point")
+			}
+		}
+	}
+
+	return snaptimes[0].time, nil
+
+}
+
+var findSyncPointFSNoFilesystemVersionsErr = fmt.Errorf("no filesystem versions")
+
+func findSyncPointFSNextOptimalSnapshotTime(ctx context.Context, now time.Time, interval time.Duration, prefix string, d *zfs.DatasetPath) (time.Time, error) {
+
+	fsvs, err := zfs.ZFSListFilesystemVersions(ctx, d, zfs.ListFilesystemVersionsOptions{
+		Types:           zfs.Snapshots,
+		ShortnamePrefix: prefix,
+	})
+	if err != nil {
+		return time.Time{}, errors.Wrap(err, "list filesystem versions")
+	}
+	if len(fsvs) <= 0 {
+		return time.Time{}, findSyncPointFSNoFilesystemVersionsErr
+	}
+
+	// Sort versions by creation
+	sort.SliceStable(fsvs, func(i, j int) bool {
+		return fsvs[i].CreateTXG < fsvs[j].CreateTXG
+	})
+
+	latest := fsvs[len(fsvs)-1]
+	getLogger(ctx).WithField("creation", latest.Creation).Debug("found latest snapshot")
+
+	since := now.Sub(latest.Creation)
+	if since < 0 {
+		return time.Time{}, fmt.Errorf("snapshot %q is from the future: creation=%q now=%q", latest.ToAbsPath(d), latest.Creation, now)
+	}
+
+	return latest.Creation.Add(interval), nil
+}
+
+type PeriodicReport struct {
+	State State
+	// valid in state SyncUp and Waiting
+	SleepUntil time.Time
+	// valid in state Err
+	Error string
+	// valid in state Snapshotting
+	Progress []*ReportFilesystem
+}
+
+func (s *Periodic) Report() Report {
+	s.mtx.Lock()
+	defer s.mtx.Unlock()
+
+	var progress []*ReportFilesystem = nil
+	if s.plan != nil {
+		progress = s.plan.report()
+	}
+
+	r := &PeriodicReport{
+		State:      s.state,
+		SleepUntil: s.sleepUntil,
+		Error:      errOrEmptyString(s.err),
+		Progress:   progress,
+	}
+
+	return Report{Type: TypePeriodic, Periodic: r}
+}

daemon/snapper/snapper.go

@@ -3,497 +3,40 @@ package snapper
 import (
 	"context"
 	"fmt"
-	"sort"
-	"sync"
-	"time"
-
-	"github.com/pkg/errors"
-
-	"github.com/zrepl/zrepl/daemon/logging/trace"
 
 	"github.com/zrepl/zrepl/config"
-	"github.com/zrepl/zrepl/daemon/hooks"
-	"github.com/zrepl/zrepl/daemon/logging"
-	"github.com/zrepl/zrepl/logger"
-	"github.com/zrepl/zrepl/util/envconst"
 	"github.com/zrepl/zrepl/zfs"
 )
 
-//go:generate stringer -type=SnapState
-type SnapState uint
+type Type string
 
 const (
-	SnapPending SnapState = 1 << iota
-	SnapStarted
-	SnapDone
-	SnapError
+	TypePeriodic Type = "periodic"
+	TypeCron     Type = "cron"
+	TypeManual   Type = "manual"
 )
 
-// All fields protected by Snapper.mtx
-type snapProgress struct {
-	state SnapState
-
-	// SnapStarted, SnapDone, SnapError
-	name     string
-	startAt  time.Time
-	hookPlan *hooks.Plan
-
-	// SnapDone
-	doneAt time.Time
-
-	// SnapErr TODO disambiguate state
-	runResults hooks.PlanReport
+type Snapper interface {
+	Run(ctx context.Context, snapshotsTaken chan<- struct{})
+	Report() Report
 }
 
-type args struct {
-	ctx            context.Context
-	prefix         string
-	interval       time.Duration
-	fsf            zfs.DatasetFilter
-	snapshotsTaken chan<- struct{}
-	hooks          *hooks.List
-	dryRun         bool
+type Report struct {
+	Type     Type
+	Periodic *PeriodicReport
+	Cron     *CronReport
+	Manual   *struct{}
 }
 
-type Snapper struct {
-	args args
-
-	mtx   sync.Mutex
-	state State
-
-	// set in state Plan, used in Waiting
-	lastInvocation time.Time
-
-	// valid for state Snapshotting
-	plan map[*zfs.DatasetPath]*snapProgress
-
-	// valid for state SyncUp and Waiting
-	sleepUntil time.Time
-
-	// valid for state Err
-	err error
-}
-
-//go:generate stringer -type=State
-type State uint
-
-const (
-	SyncUp State = 1 << iota
-	SyncUpErrWait
-	Planning
-	Snapshotting
-	Waiting
-	ErrorWait
-	Stopped
-)
-
-func (s State) sf() state {
-	m := map[State]state{
-		SyncUp:        syncUp,
-		SyncUpErrWait: wait,
-		Planning:      plan,
-		Snapshotting:  snapshot,
-		Waiting:       wait,
-		ErrorWait:     wait,
-		Stopped:       nil,
-	}
-	return m[s]
-}
-
-type updater func(u func(*Snapper)) State
-type state func(a args, u updater) state
-
-type Logger = logger.Logger
-
-func getLogger(ctx context.Context) Logger {
-	return logging.GetLogger(ctx, logging.SubsysSnapshot)
-}
-
-func PeriodicFromConfig(g *config.Global, fsf zfs.DatasetFilter, in *config.SnapshottingPeriodic) (*Snapper, error) {
-	if in.Prefix == "" {
-		return nil, errors.New("prefix must not be empty")
-	}
-	if in.Interval <= 0 {
-		return nil, errors.New("interval must be positive")
-	}
-
-	hookList, err := hooks.ListFromConfig(&in.Hooks)
-	if err != nil {
-		return nil, errors.Wrap(err, "hook config error")
-	}
-
-	args := args{
-		prefix:   in.Prefix,
-		interval: in.Interval,
-		fsf:      fsf,
-		hooks:    hookList,
-		// ctx and log is set in Run()
-	}
-
-	return &Snapper{state: SyncUp, args: args}, nil
-}
-
-func (s *Snapper) Run(ctx context.Context, snapshotsTaken chan<- struct{}) {
-	defer trace.WithSpanFromStackUpdateCtx(&ctx)()
-	getLogger(ctx).Debug("start")
-	defer getLogger(ctx).Debug("stop")
-
-	s.args.snapshotsTaken = snapshotsTaken
-	s.args.ctx = ctx
-	s.args.dryRun = false // for future expansion
-
-	u := func(u func(*Snapper)) State {
-		s.mtx.Lock()
-		defer s.mtx.Unlock()
-		if u != nil {
-			u(s)
-		}
-		return s.state
-	}
-
-	var st state = syncUp
-
-	for st != nil {
-		pre := u(nil)
-		st = st(s.args, u)
-		post := u(nil)
-		getLogger(ctx).
-			WithField("transition", fmt.Sprintf("%s=>%s", pre, post)).
-			Debug("state transition")
-
-	}
-
-}
-
-func onErr(err error, u updater) state {
-	return u(func(s *Snapper) {
-		s.err = err
-		preState := s.state
-		switch s.state {
-		case SyncUp:
-			s.state = SyncUpErrWait
-		case Planning:
-			fallthrough
-		case Snapshotting:
-			s.state = ErrorWait
-		}
-		getLogger(s.args.ctx).WithError(err).WithField("pre_state", preState).WithField("post_state", s.state).Error("snapshotting error")
-	}).sf()
-}
-
-func onMainCtxDone(ctx context.Context, u updater) state {
-	return u(func(s *Snapper) {
-		s.err = ctx.Err()
-		s.state = Stopped
-	}).sf()
-}
-
-func syncUp(a args, u updater) state {
-	u(func(snapper *Snapper) {
-		snapper.lastInvocation = time.Now()
-	})
-	fss, err := listFSes(a.ctx, a.fsf)
-	if err != nil {
-		return onErr(err, u)
-	}
-	syncPoint, err := findSyncPoint(a.ctx, fss, a.prefix, a.interval)
-	if err != nil {
-		return onErr(err, u)
-	}
-	u(func(s *Snapper) {
-		s.sleepUntil = syncPoint
-	})
-	t := time.NewTimer(time.Until(syncPoint))
-	defer t.Stop()
-	select {
-	case <-t.C:
-		return u(func(s *Snapper) {
-			s.state = Planning
-		}).sf()
-	case <-a.ctx.Done():
-		return onMainCtxDone(a.ctx, u)
-	}
-}
-
-func plan(a args, u updater) state {
-	u(func(snapper *Snapper) {
-		snapper.lastInvocation = time.Now()
-	})
-	fss, err := listFSes(a.ctx, a.fsf)
-	if err != nil {
-		return onErr(err, u)
-	}
-
-	plan := make(map[*zfs.DatasetPath]*snapProgress, len(fss))
-	for _, fs := range fss {
-		plan[fs] = &snapProgress{state: SnapPending}
-	}
-	return u(func(s *Snapper) {
-		s.state = Snapshotting
-		s.plan = plan
-		s.err = nil
-	}).sf()
-}
-
-func snapshot(a args, u updater) state {
-
-	var plan map[*zfs.DatasetPath]*snapProgress
-	u(func(snapper *Snapper) {
-		plan = snapper.plan
-	})
-
-	hookMatchCount := make(map[hooks.Hook]int, len(*a.hooks))
-	for _, h := range *a.hooks {
-		hookMatchCount[h] = 0
-	}
-
-	anyFsHadErr := false
-	// TODO channel programs -> allow a little jitter?
-	for fs, progress := range plan {
-		suffix := time.Now().In(time.UTC).Format("20060102_150405_000")
-		snapname := fmt.Sprintf("%s%s", a.prefix, suffix)
-
-		ctx := logging.WithInjectedField(a.ctx, "fs", fs.ToString())
-		ctx = logging.WithInjectedField(ctx, "snap", snapname)
-
-		hookEnvExtra := hooks.Env{
-			hooks.EnvFS:       fs.ToString(),
-			hooks.EnvSnapshot: snapname,
-		}
-
-		jobCallback := hooks.NewCallbackHookForFilesystem("snapshot", fs, func(ctx context.Context) (err error) {
-			l := getLogger(ctx)
-			l.Debug("create snapshot")
-			err = zfs.ZFSSnapshot(ctx, fs, snapname, false) // TODO propagate context to ZFSSnapshot
-			if err != nil {
-				l.WithError(err).Error("cannot create snapshot")
-			}
-			return
-		})
-
-		fsHadErr := false
-		var planReport hooks.PlanReport
-		var plan *hooks.Plan
-		{
-			filteredHooks, err := a.hooks.CopyFilteredForFilesystem(fs)
-			if err != nil {
-				getLogger(ctx).WithError(err).Error("unexpected filter error")
-				fsHadErr = true
-				goto updateFSState
-			}
-			// account for running hooks
-			for _, h := range filteredHooks {
-				hookMatchCount[h] = hookMatchCount[h] + 1
-			}
-
-			var planErr error
-			plan, planErr = hooks.NewPlan(&filteredHooks, hooks.PhaseSnapshot, jobCallback, hookEnvExtra)
-			if planErr != nil {
-				fsHadErr = true
-				getLogger(ctx).WithError(planErr).Error("cannot create job hook plan")
-				goto updateFSState
-			}
-		}
-		u(func(snapper *Snapper) {
-			progress.name = snapname
-			progress.startAt = time.Now()
-			progress.hookPlan = plan
-			progress.state = SnapStarted
-		})
-		{
-			getLogger(ctx).WithField("report", plan.Report().String()).Debug("begin run job plan")
-			plan.Run(ctx, a.dryRun)
-			planReport = plan.Report()
-			fsHadErr = planReport.HadError() // not just fatal errors
-			if fsHadErr {
-				getLogger(ctx).WithField("report", planReport.String()).Error("end run job plan with error")
-			} else {
-				getLogger(ctx).WithField("report", planReport.String()).Info("end run job plan successful")
-			}
-		}
-
-	updateFSState:
-		anyFsHadErr = anyFsHadErr || fsHadErr
-		u(func(snapper *Snapper) {
-			progress.doneAt = time.Now()
-			progress.state = SnapDone
-			if fsHadErr {
-				progress.state = SnapError
-			}
-			progress.runResults = planReport
-		})
-	}
-
-	select {
-	case a.snapshotsTaken <- struct{}{}:
+func FromConfig(g *config.Global, fsf zfs.DatasetFilter, in config.SnapshottingEnum) (Snapper, error) {
+	switch v := in.Ret.(type) {
+	case *config.SnapshottingPeriodic:
+		return periodicFromConfig(g, fsf, v)
+	case *config.SnapshottingCron:
+		return cronFromConfig(fsf, *v)
+	case *config.SnapshottingManual:
+		return &manual{}, nil
 	default:
-		if a.snapshotsTaken != nil {
-			getLogger(a.ctx).Warn("callback channel is full, discarding snapshot update event")
-		}
-	}
-
-	for h, mc := range hookMatchCount {
-		if mc == 0 {
-			hookIdx := -1
-			for idx, ah := range *a.hooks {
-				if ah == h {
-					hookIdx = idx
-					break
-				}
-			}
-			getLogger(a.ctx).WithField("hook", h.String()).WithField("hook_number", hookIdx+1).Warn("hook did not match any snapshotted filesystems")
-		}
-	}
-
-	return u(func(snapper *Snapper) {
-		if anyFsHadErr {
-			snapper.state = ErrorWait
-			snapper.err = errors.New("one or more snapshots could not be created, check logs for details")
-		} else {
-			snapper.state = Waiting
-			snapper.err = nil
-		}
-	}).sf()
-}
-
-func wait(a args, u updater) state {
-	var sleepUntil time.Time
-	u(func(snapper *Snapper) {
-		lastTick := snapper.lastInvocation
-		snapper.sleepUntil = lastTick.Add(a.interval)
-		sleepUntil = snapper.sleepUntil
-		log := getLogger(a.ctx).WithField("sleep_until", sleepUntil).WithField("duration", a.interval)
-		logFunc := log.Debug
-		if snapper.state == ErrorWait || snapper.state == SyncUpErrWait {
-			logFunc = log.Error
-		}
-		logFunc("enter wait-state after error")
-	})
-
-	t := time.NewTimer(time.Until(sleepUntil))
-	defer t.Stop()
-
-	select {
-	case <-t.C:
-		return u(func(snapper *Snapper) {
-			snapper.state = Planning
-		}).sf()
-	case <-a.ctx.Done():
-		return onMainCtxDone(a.ctx, u)
+		return nil, fmt.Errorf("unknown snapshotting type %T", v)
 	}
 }
-
-func listFSes(ctx context.Context, mf zfs.DatasetFilter) (fss []*zfs.DatasetPath, err error) {
-	return zfs.ZFSListMapping(ctx, mf)
-}
-
-var syncUpWarnNoSnapshotUntilSyncupMinDuration = envconst.Duration("ZREPL_SNAPPER_SYNCUP_WARN_MIN_DURATION", 1*time.Second)
-
-// see docs/snapshotting.rst
-func findSyncPoint(ctx context.Context, fss []*zfs.DatasetPath, prefix string, interval time.Duration) (syncPoint time.Time, err error) {
-
-	const (
-		prioHasVersions int = iota
-		prioNoVersions
-	)
-
-	type snapTime struct {
-		ds   *zfs.DatasetPath
-		prio int // lower is higher
-		time time.Time
-	}
-
-	if len(fss) == 0 {
-		return time.Now(), nil
-	}
-
-	snaptimes := make([]snapTime, 0, len(fss))
-	hardErrs := 0
-
-	now := time.Now()
-
-	getLogger(ctx).Debug("examine filesystem state to find sync point")
-	for _, d := range fss {
-		ctx := logging.WithInjectedField(ctx, "fs", d.ToString())
-		syncPoint, err := findSyncPointFSNextOptimalSnapshotTime(ctx, now, interval, prefix, d)
-		if err == findSyncPointFSNoFilesystemVersionsErr {
-			snaptimes = append(snaptimes, snapTime{
-				ds:   d,
-				prio: prioNoVersions,
-				time: now,
-			})
-		} else if err != nil {
-			hardErrs++
-			getLogger(ctx).WithError(err).Error("cannot determine optimal sync point for this filesystem")
-		} else {
-			getLogger(ctx).WithField("syncPoint", syncPoint).Debug("found optimal sync point for this filesystem")
-			snaptimes = append(snaptimes, snapTime{
-				ds:   d,
-				prio: prioHasVersions,
-				time: syncPoint,
-			})
-		}
-	}
-
-	if hardErrs == len(fss) {
-		return time.Time{}, fmt.Errorf("hard errors in determining sync point for every matching filesystem")
-	}
-
-	if len(snaptimes) == 0 {
-		panic("implementation error: loop must either inc hardErrs or add result to snaptimes")
-	}
-
-	// sort ascending by (prio,time)
-	// => those filesystems with versions win over those without any
-	sort.Slice(snaptimes, func(i, j int) bool {
-		if snaptimes[i].prio == snaptimes[j].prio {
-			return snaptimes[i].time.Before(snaptimes[j].time)
-		}
-		return snaptimes[i].prio < snaptimes[j].prio
-	})
-
-	winnerSyncPoint := snaptimes[0].time
-	l := getLogger(ctx).WithField("syncPoint", winnerSyncPoint.String())
-	l.Info("determined sync point")
-	if winnerSyncPoint.Sub(now) > syncUpWarnNoSnapshotUntilSyncupMinDuration {
-		for _, st := range snaptimes {
-			if st.prio == prioNoVersions {
-				l.WithField("fs", st.ds.ToString()).Warn("filesystem will not be snapshotted until sync point")
-			}
-		}
-	}
-
-	return snaptimes[0].time, nil
-
-}
-
-var findSyncPointFSNoFilesystemVersionsErr = fmt.Errorf("no filesystem versions")
-
-func findSyncPointFSNextOptimalSnapshotTime(ctx context.Context, now time.Time, interval time.Duration, prefix string, d *zfs.DatasetPath) (time.Time, error) {
-
-	fsvs, err := zfs.ZFSListFilesystemVersions(ctx, d, zfs.ListFilesystemVersionsOptions{
-		Types:           zfs.Snapshots,
-		ShortnamePrefix: prefix,
-	})
-	if err != nil {
-		return time.Time{}, errors.Wrap(err, "list filesystem versions")
-	}
-	if len(fsvs) <= 0 {
-		return time.Time{}, findSyncPointFSNoFilesystemVersionsErr
-	}
-
-	// Sort versions by creation
-	sort.SliceStable(fsvs, func(i, j int) bool {
-		return fsvs[i].CreateTXG < fsvs[j].CreateTXG
-	})
-
-	latest := fsvs[len(fsvs)-1]
-	getLogger(ctx).WithField("creation", latest.Creation).Debug("found latest snapshot")
-
-	since := now.Sub(latest.Creation)
-	if since < 0 {
-		return time.Time{}, fmt.Errorf("snapshot %q is from the future: creation=%q now=%q", latest.ToAbsPath(d), latest.Creation, now)
-	}
-
-	return latest.Creation.Add(interval), nil
-}

daemon/snapper/snapper_all.go

@@ -1,48 +0,0 @@
-package snapper
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/zrepl/zrepl/config"
-	"github.com/zrepl/zrepl/zfs"
-)
-
-// FIXME: properly abstract snapshotting:
-//   - split up things that trigger snapshotting from the mechanism
-//     - timer-based trigger (periodic)
-//     - call from control socket (manual)
-//     - mixed modes?
-//   - support a `zrepl snapshot JOBNAME` subcommand for config.SnapshottingManual
-type PeriodicOrManual struct {
-	s *Snapper
-}
-
-func (s *PeriodicOrManual) Run(ctx context.Context, wakeUpCommon chan<- struct{}) {
-	if s.s != nil {
-		s.s.Run(ctx, wakeUpCommon)
-	}
-}
-
-// Returns nil if manual
-func (s *PeriodicOrManual) Report() *Report {
-	if s.s != nil {
-		return s.s.Report()
-	}
-	return nil
-}
-
-func FromConfig(g *config.Global, fsf zfs.DatasetFilter, in config.SnapshottingEnum) (*PeriodicOrManual, error) {
-	switch v := in.Ret.(type) {
-	case *config.SnapshottingPeriodic:
-		snapper, err := PeriodicFromConfig(g, fsf, v)
-		if err != nil {
-			return nil, err
-		}
-		return &PeriodicOrManual{snapper}, nil
-	case *config.SnapshottingManual:
-		return &PeriodicOrManual{}, nil
-	default:
-		return nil, fmt.Errorf("unknown snapshotting type %T", v)
-	}
-}

daemon/snapper/snapper_report.go

@@ -1,118 +0,0 @@
-package snapper
-
-import (
-	"fmt"
-	"sort"
-	"strings"
-	"time"
-
-	"github.com/zrepl/zrepl/daemon/hooks"
-)
-
-type Report struct {
-	State State
-	// valid in state SyncUp and Waiting
-	SleepUntil time.Time
-	// valid in state Err
-	Error string
-	// valid in state Snapshotting
-	Progress []*ReportFilesystem
-}
-
-type ReportFilesystem struct {
-	Path  string
-	State SnapState
-
-	// Valid in SnapStarted and later
-	SnapName      string
-	StartAt       time.Time
-	Hooks         string
-	HooksHadError bool
-
-	// Valid in SnapDone | SnapError
-	DoneAt time.Time
-}
-
-func errOrEmptyString(e error) string {
-	if e != nil {
-		return e.Error()
-	}
-	return ""
-}
-
-func (s *Snapper) Report() *Report {
-	s.mtx.Lock()
-	defer s.mtx.Unlock()
-
-	pReps := make([]*ReportFilesystem, 0, len(s.plan))
-	for fs, p := range s.plan {
-		var hooksStr string
-		var hooksHadError bool
-		if p.hookPlan != nil {
-			hr := p.hookPlan.Report()
-			// FIXME: technically this belongs into client
-			// but we can't serialize hooks.Step ATM
-			rightPad := func(str string, length int, pad string) string {
-				if len(str) > length {
-					return str[:length]
-				}
-				return str + strings.Repeat(pad, length-len(str))
-			}
-			hooksHadError = hr.HadError()
-			rows := make([][]string, len(hr))
-			const numCols = 4
-			lens := make([]int, numCols)
-			for i, e := range hr {
-				rows[i] = make([]string, numCols)
-				rows[i][0] = fmt.Sprintf("%d", i+1)
-				rows[i][1] = e.Status.String()
-				runTime := "..."
-				if e.Status != hooks.StepPending {
-					runTime = e.End.Sub(e.Begin).Round(time.Millisecond).String()
-				}
-				rows[i][2] = runTime
-				rows[i][3] = ""
-				if e.Report != nil {
-					rows[i][3] = e.Report.String()
-				}
-				for j, col := range lens {
-					if len(rows[i][j]) > col {
-						lens[j] = len(rows[i][j])
-					}
-				}
-			}
-			rowsFlat := make([]string, len(hr))
-			for i, r := range rows {
-				colsPadded := make([]string, len(r))
-				for j, c := range r[:len(r)-1] {
-					colsPadded[j] = rightPad(c, lens[j], " ")
-				}
-				colsPadded[len(r)-1] = r[len(r)-1]
-				rowsFlat[i] = strings.Join(colsPadded, " ")
-			}
-			hooksStr = strings.Join(rowsFlat, "\n")
-		}
-		pReps = append(pReps, &ReportFilesystem{
-			Path:          fs.ToString(),
-			State:         p.state,
-			SnapName:      p.name,
-			StartAt:       p.startAt,
-			DoneAt:        p.doneAt,
-			Hooks:         hooksStr,
-			HooksHadError: hooksHadError,
-		})
-	}
-
-	sort.Slice(pReps, func(i, j int) bool {
-		return strings.Compare(pReps[i].Path, pReps[j].Path) == -1
-	})
-
-	r := &Report{
-		State:      s.state,
-		SleepUntil: s.sleepUntil,
-		Error:      errOrEmptyString(s.err),
-		Progress:   pReps,
-	}
-
-	return r
-}

daemon/snapper/util.go

@@ -0,0 +1,21 @@
+package snapper
+
+import (
+	"context"
+
+	"github.com/zrepl/zrepl/daemon/logging"
+	"github.com/zrepl/zrepl/logger"
+)
+
+type Logger = logger.Logger
+
+func getLogger(ctx context.Context) Logger {
+	return logging.GetLogger(ctx, logging.SubsysSnapshot)
+}
+
+func errOrEmptyString(e error) string {
+	if e != nil {
+		return e.Error()
+	}
+	return ""
+}

dist/grafana/grafana-prometheus-zrepl.json

@@ -249,7 +249,7 @@
             "stack": true,
             "steppedLine": false,
             "targets": [{
-                "expr": "zrepl_version_daemon{job='$prom_job_name'}",
+                "expr": "sgn(zrepl_start_time{job='$prom_job_name'})",
                 "format": "time_series",
                 "interval": "",
                 "intervalFactor": 1,
@@ -1235,7 +1235,7 @@
         ]
     },
     "timezone": "",
-    "title": "zrepl 0.3",
+    "title": "zrepl",
     "uid": "etQuvBnGz",
-    "version": 7
+    "version": 8
 }

dist/systemd/zrepl.service

@@ -9,6 +9,9 @@ ExecStart=/usr/local/bin/zrepl --config /etc/zrepl/zrepl.yml daemon
 RuntimeDirectory=zrepl zrepl/stdinserver
 RuntimeDirectoryMode=0700
 
+# Make Go produce coredumps
+Environment=GOTRACEBACK='crash'
+
 ProtectSystem=strict
 #PrivateDevices=yes # TODO ZFS needs access to /dev/zfs, could we limit this?
 ProtectKernelTunables=yes
@@ -27,7 +30,8 @@ ProtectHome=read-only
 # SystemCallFilter
 #   ~@privileged doesn't work with Ubuntu 18.04 ssh
 SystemCallFilter=~ @mount @cpu-emulation @keyring @module @obsolete @raw-io @debug @clock @resources
-
+# Go1.19 added automatic RLIMIT_NOFILE changes, so, we need to allow that
+SystemCallFilter= setrlimit
 
 [Install]
 WantedBy=multi-user.target

docs/changelog.rst

@@ -16,6 +16,70 @@ Changelog
 The changelog summarizes bugfixes that are deemed relevant for users and package maintainers.
 Developers should consult the git commit log or GitHub issue tracker.
 
+Next Release
+------------
+
+The plan for the next release is to revisit how zrepl does snapshot management.
+High-level goals:
+
+- Make it easy to decouple snapshot management (snapshotting, pruning) from replication.
+- Ability to include/exclude snapshots from replication.
+  This is useful for aforementioned decoupling, e.g., separate snapshot prefixes for local & remote replication.
+  Also, it makes explicit that by default, zrepl replicates all snapshots, and that
+  replication has no concept of "zrepl-created snapshots", which is a common misconception.
+- Use of ``zfs snapshot`` comma syntax or channel programs to take snapshots of multiple
+  datasets atomically.
+- Provide an alternative to the ``grid`` pruning policy.
+  Most likely something based on hourly/daily/weekly/monthly "trains" plus a count.
+- Ability to prune at the granularity of the **group** of snapshots created at a given
+  time, as opposed to the individual snapshots within a dataset.
+  Maybe this will be addressed by the alternative to the ``grid`` pruning policy,
+  as it will likely be more predictable.
+
+Those changes will likely come with some breakage in the config.
+However, I want to avoid breaking **use cases** that are satisfied by the current design.
+There will be beta/RC releases to give users a chance to evaluate.
+
+0.6
+---
+
+* |feature| :ref:`Schedule-based snapshotting<job-snapshotting--cron>` using ``cron`` syntax instead of an interval.
+* |feature| Configurable initial replication policy.
+  When a filesystem is first replicated to a receiver, this control whether just the newest
+  snapshot will be replicated vs. all existing snapshots. Learn more :ref:`in the docs <conflict_resolution-initial_replication>`.
+* |feature| Configurable timestamp format for snapshot names via :ref:`timestamp_format<job-snapshotting-timestamp_format>`
+  (Thanks, `@ydylla <https://github.com/ydylla>`_).
+* |feature| Add ``ZREPL_DESTROY_MAX_BATCH_SIZE`` env var (default 0=unlimited)
+  (Thanks, `@3nprob <https://github.com/3nprob>`_).
+* |feature| Add ``zrepl configcheck --skip-cert-check`` flag (Thanks, `@cole-h <https://github.com/cole-h>`_).
+* |bugfix| Fix resuming from interrupted replications that use ``send.raw`` on unencrypted datasets.
+
+  * The send options introduced in zrepl 0.4 allow users to specify additional zfs send flags for zrepl to use.
+    Before this fix, when setting ``send.raw=true`` on a job that replicates unencrypted datasets,
+    zrepl would not allow an interrupted replication to resume.
+    The reason were overly cautious checks to support the ``send.encrypted`` option.
+  * This bugfix removes these checks from the replication planner.
+    This makes ``send.encrypted`` a sender-side-only concern, much like all other ``send.*`` flags.
+  * However, this means that the ``zrepl status`` UI no longer indicates whether a replication step uses encrypted sends or not.
+    The setting is still effective though.
+
+* |break| convert Prometheus metric ``zrepl_version_daemon`` to ``zrepl_start_time`` metric
+
+  * The metric still reports the zrepl version in a label.
+    But the metric *value* is now the Unix timestamp at the time the daemon was started.
+    The Grafana dashboard in :repomasterlink:`dist/grafana` has been updated.
+
+* |bugfix| transient zrepl status error: ``Post "http://unix/status": EOF``
+* |bugfix| don't treat receive-side bookmarks as a replication conflict.
+  This facilitates chaining of replication jobs. See :issue:`490`.
+* |bugfix| workaround for Go/gRPC problem on Illumos where zrepl would
+  crash when using the ``local`` transport type (:issue:`598`).
+* |bugfix| fix active child tasks panic that cold occur during replication plannig (:issue:`193abbe`)
+* |bugfix| ``zrepl status`` off-by-one error in display of completed step count (:commit:`ce6701f`)
+* |bugfix| Allow using day & week units for ``snapshotting.interval`` (:commit:`ffb1d89`)
+* |docs| ``docs/overview`` improvements (Thanks, `@jtagcat <https://github.com/jtagcat>`_).
+* |maint| Update to Go 1.19.
+
 0.5
 ---
 

docs/configuration.rst

@@ -13,6 +13,7 @@ Configuration
     configuration/filter_syntax
     configuration/sendrecvoptions
     configuration/replication
+    configuration/conflict_resolution
     configuration/snapshotting
     configuration/prune
     configuration/logging

docs/configuration/conflict_resolution.rst

@@ -0,0 +1,36 @@
+.. include:: ../global.rst.inc
+
+
+Conflict Resolution Options
+===========================
+
+
+::
+
+   jobs:
+   - type: push
+     filesystems: ...
+     conflict_resolution:
+       initial_replication: most_recent | all | fail # default: most_recent
+
+     ...
+
+.. _conflict_resolution-initial_replication:
+
+
+``initial_replication`` option
+------------------------------
+
+The ``initial_replication`` option determines how many snapshots zrepl replicates if the filesystem has not been replicated before.
+If ``most_recent`` (the default), the initial replication will only transfer the most recent snapshot, while ignoring previous snapshots.
+If all snapshots should be replicated, specify ``all``.
+Use ``fail`` to make replication of the filesystem fail in case there is no corresponding fileystem on the receiver.
+
+For example, suppose there are snapshosts ``tank@1``, ``tank@2``, ``tank@3`` on a sender.
+Then ``most_recent`` will replicate just ``@3``, but ``all`` will replicate ``@1``, ``@2``, and ``@3``.
+
+If initial replication is interrupted, and there is at least one (maybe partial) snapshot on the receiver, zrepl will always resume in **incremental mode**.
+And that is regardless of where the initial replication was interrupted.
+
+For example, if ``initial_replication: all`` and the transfer of ``@1`` is interrupted, zrepl would retry/resume at ``@1``.
+And even if the user changes the config to ``initial_replication: most_recent`` before resuming, **incremental mode** will still resume at ``@1``.

docs/configuration/misc.rst

@@ -1,3 +1,5 @@
+.. _miscellaneous:
+
 Miscellaneous
 =============
 

docs/configuration/overview.rst

@@ -3,16 +3,17 @@ Overview & Terminology
 ======================
 
 All work zrepl does is performed by the zrepl daemon which is configured in a single YAML configuration file loaded on startup.
-The following paths are considered:
+The following paths are searched, in this order:
 
-* If set, the location specified via the global ``--config`` flag
-* ``/etc/zrepl/zrepl.yml``
-* ``/usr/local/etc/zrepl/zrepl.yml``
+1. The path specified via the global ``--config`` flag
+2. ``/etc/zrepl/zrepl.yml``
+3. ``/usr/local/etc/zrepl/zrepl.yml``
 
-The ``zrepl configcheck`` subcommand can be used to validate the configuration.
-The command will output nothing and exit with zero status code if the configuration is valid.
+``zrepl configcheck`` can be used to validate the configuration.
+If the configuration is valid, it will output nothing and exit with code ``0``.
 The error messages vary in quality and usefulness: please report confusing config errors to the tracking :issue:`155`.
-Full example configs such as in the :ref:`quick-start guides <quickstart-toc>` or the :sampleconf:`/` directory might also be helpful.
+
+Full example configs are available at :ref:`quick-start guides <quickstart-toc>` and :sampleconf:`/`.
 However, copy-pasting examples is no substitute for reading documentation!
 
 Config File Structure
@@ -26,9 +27,8 @@ Config File Structure
      type: push
    - ...
 
-zrepl is configured using a single YAML configuration file with two main sections: ``global`` and ``jobs``.
-The ``global`` section is filled with sensible defaults and is covered later in this chapter.
-The ``jobs`` section is a list of jobs which we are going to explain now.
+A zrepl configuration file is divided in to two main sections: ``global`` and ``jobs``.
+``global`` has sensible defaults. It is covered in :ref:`logging <logging>`, :ref:`monitoring <monitoring>` \& :ref:`miscellaneous <miscellaneous>`.
 
 .. _job-overview:
 
@@ -42,8 +42,7 @@ Jobs are identified by their ``name``, both in log files and the ``zrepl status`
 .. NOTE::
    The job name is persisted in several places on disk and thus :issue:`cannot be changed easily<327>`.
 
-
-Replication always happens between a pair of jobs: one is the **active side**, and one the **passive side**.
+Replication always happens between a pair of jobs: one **active side** and one **passive side**.
 The active side connects to the passive side using a :ref:`transport <transport>` and starts executing the replication logic.
 The passive side responds to requests from the active side after checking its permissions.
 
@@ -72,30 +71,29 @@ How the Active Side Works
 
 The active side (:ref:`push <job-push>` and :ref:`pull <job-pull>` job) executes the replication and pruning logic:
 
-* Wakeup because of finished snapshotting (``push`` job) or pull interval ticker (``pull`` job).
-* Connect to the corresponding passive side using a :ref:`transport <transport>` and instantiate an RPC client.
-* Replicate data from the sending to the receiving side (see below).
-* Prune on sender & receiver.
+1. Wakeup after snapshotting (``push`` job) or pull interval ticker (``pull`` job).
+2. Connect to the passive side and instantiate an RPC client.
+3. Replicate data from the sender to the receiver.
+4. Prune on sender & receiver.
 
 .. TIP::
-  The progress of the active side can be watched live using the ``zrepl status`` subcommand.
+  The progress of the active side can be watched live using ``zrepl status``.
 
 .. _overview-passive-side--client-identity:
 
 How the Passive Side Works
 --------------------------
 
-The passive side (:ref:`sink <job-sink>` and :ref:`source <job-source>`) waits for connections from the corresponding active side,
-using the transport listener type specified in the ``serve`` field of the job configuration.
-When a client connects, the transport listener performS listener-specific access control (cert validation, IP ACLs, etc)
-and determines the *client identity*.
-The passive side job then uses this client identity as follows:
+The passive side (:ref:`sink <job-sink>` and :ref:`source <job-source>`) waits for connections from the active side,
+on the :ref:`transport <transport>` specified with ``serve`` in the job configuration.
+The respective transport then perfoms authentication & authorization, resulting in a stable *client identity*.
+The passive side job uses this *client identity* as follows:
 
-* The ``sink`` job maps requests from different client identities to their respective sub-filesystem tree ``root_fs/${client_identity}``.
-* The ``source`` might, in the future, embed the client identity in :ref:`zrepl's ZFS abstraction names <zrepl-zfs-abstractions>` in order to support multi-host replication.
+   * In ``sink`` jobs, to map requests from different *client identities* to their respective sub-filesystem tree ``root_fs/${client_identity}``.
+   * *In the future, ``source`` might embed the client identity in :ref:`zrepl's ZFS abstraction names <zrepl-zfs-abstractions>`, to support multi-host replication.*
 
 .. TIP::
-   The implementation of the ``sink`` job requires that the connecting client identities be a valid ZFS filesystem name components.
+   The use of the client identity in the ``sink`` job implies that it must be usable as a ZFS ZFS filesystem name component.
 
 .. _overview-how-replication-works:
 
@@ -106,7 +104,7 @@ One of the major design goals of the replication module is to avoid any duplicat
 As such, the code works on abstract senders and receiver **endpoints**, where typically one will be implemented by a local program object and the other is an RPC client instance.
 Regardless of push- or pull-style setup, the logic executes on the active side, i.e. in the ``push`` or ``pull`` job.
 
-The following high-level steps take place during replication and can be monitored using the ``zrepl status`` subcommand:
+The following high-level steps take place during replication and can be monitored using ``zrepl status``:
 
 * Plan the replication:
 
@@ -233,22 +231,11 @@ The ``zrepl zfs-abstraction list`` command provides a listing of all bookmarks a
 
     More details can be found in the design document :repomasterlink:`replication/design.md`.
 
-Limitations
-^^^^^^^^^^^
 
-.. ATTENTION::
+Caveats With Complex Setups (More Than 2 Jobs or Machines)
+----------------------------------------------------------
 
-    Currently, zrepl does not replicate filesystem properties.
-    When receiving a filesystem, it is never mounted (`-u` flag)  and `mountpoint=none` is set.
-    This is temporary and being worked on :issue:`24`.
-
-
-.. _jobs-multiple-jobs:
-
-Multiple Jobs & More than 2 Machines
-------------------------------------
-
-The quick-start guides focus on simple setups with a single sender and a single receiver.
+Most users are served well with a single sender and a single receiver job.
 This section documents considerations for more complex setups.
 
 .. ATTENTION::
@@ -262,7 +249,7 @@ This section documents considerations for more complex setups.
 
    If you can't find your desired configuration, have questions or would like to see improvements to multi-job setups, please `open an issue on GitHub <https://github.com/zrepl/zrepl/issues/new>`_.
 
-Multiple Jobs on one Machine
+Multiple Jobs on One Machine
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 As a general rule, multiple jobs configured on one machine **must operate on disjoint sets of filesystems**.
 Otherwise, concurrently running jobs might interfere when operating on the same filesystem.
@@ -281,18 +268,53 @@ On your setup, ensure that
   This scenario is detailed in one of the :ref:`quick-start guides <quickstart-backup-to-external-disk>`.
 
 
-More Than 2 Machines
+Two Or More Machines
 ^^^^^^^^^^^^^^^^^^^^
 
 This section might be relevant to users who wish to *fan-in* (N machines replicate to 1) or *fan-out* (replicate 1 machine to N machines).
 
 **Working setups**:
 
-* N ``push`` identities, 1 ``sink`` (as long as the different push jobs have a different :ref:`client identity <overview-passive-side--client-identity>`)
+* **Fan-in: N servers replicated to one receiver, disjoint dataset trees.**
 
-  * ``sink`` constrains each client to a disjoint sub-tree of the sink-side dataset hierarchy ``${root_fs}/${client_identity}``.
+  * This is the common use case of a centralized backup server.
+
+  * Implementation:
+
+    * N ``push`` jobs (one per sender server), 1 ``sink`` (as long as the different push jobs have a different :ref:`client identity <overview-passive-side--client-identity>`)
+    * N ``source`` jobs (one per sender server), N ``pull`` on the receiver server (unique names, disjoint  ``root_fs``)
+
+  * The ``sink`` job automatically constrains each client to a disjoint sub-tree of the sink-side dataset hierarchy ``${root_fs}/${client_identity}``.
     Therefore, the different clients cannot interfere.
 
+  * The ``pull`` job only pulls from one host, so it's up to the zrepl user to ensure that the different ``pull`` jobs don't interfere.
+
+.. _fan-out-replication:
+
+* **Fan-out: 1 server replicated to N receivers**
+
+  * Can be implemented either in a pull or push fashion.
+
+    * **pull setup**: 1 ``pull`` job on each receiver server, each with a corresponding **unique** ``source`` job on the sender server.
+    * **push setup**: 1 ``sink`` job on each receiver server, each with a corresponding **unique** ``push`` job on the sender server.
+
+  * It is critical that we have one sending-side job (``source``, ``push``) per receiver.
+    The reason is that :ref:`zrepl's ZFS abstractions <zrepl-zfs-abstractions>` (``zrepl zfs-abstraction list``) include the name of the ``source``/``push`` job, but not the receive-side job name or client identity (see :issue:`380`).
+    As a counter-example, suppose we used multiple ``pull`` jobs with only one ``source`` job.
+    All ``pull`` jobs would share the same :ref:`replication cursor bookmark <replication-cursor-and-last-received-hold>` and trip over each other, breaking incremental replication guarantees quickly.
+    The anlogous problem exists for 1 ``push`` to N ``sink`` jobs.
+
+  * The ``filesystems`` matched by the sending side jobs (``source``, ``push``) need not necessarily be disjoint.
+    For this to work, we need to avoid interference between snapshotting and pruning of the different sending jobs.
+    The solution is to centralize sender-side snapshot management in a separate ``snap`` job.
+    Snapshotting in the ``source``/``push`` job should then be disabled (``type: manual``).
+    And sender-side pruning (``keep_sender``) needs to be disabled in the active side (``pull`` / ``push``), since that'll be done by the ``snap job``.
+
+  * **Restore limitations**: when restoring from one of the ``pull`` targets (e.g., using ``zfs send -R``), the replication cursor bookmarks don't exist on the restored system.
+    This can break incremental replication to all other receive-sides after restore.
+
+  * See :ref:`the fan-out replication quick-start guide <quickstart-fan-out-replication>` for an example of this setup.
+
 
 **Setups that do not work**:
 

docs/configuration/sendrecvoptions.rst

@@ -149,7 +149,7 @@ Recv Options
 Jump to
 :ref:`properties <job-recv-options--inherit-and-override>` ,
 :ref:`bandwidth_limit <job-send-recv-options--bandwidth-limit>` , and
-:ref:`bandwidth_limit <job-recv-options--placeholder>`.
+:ref:`placeholder <job-recv-options--placeholder>`.
 
 .. _job-recv-options--inherit-and-override:
 
@@ -227,7 +227,12 @@ and property replication is enabled, the receiver must :ref:`inherit the followi
 .. _job-recv-options--placeholder:
 
 Placeholders
-------------
+~~~~~~~~~~~~
+
+::
+
+   placeholder:
+     encryption: unspecified | off | inherit
 
 During replication, zrepl :ref:`creates placeholder datasets <replication-placeholder-property>` on the receiving side if the sending side's ``filesystems`` filter creates gaps in the dataset hierarchy.
 This is generally fully transparent to the user.

docs/configuration/snapshotting.rst

@@ -5,53 +5,138 @@
 Taking Snaphots
 ===============
 
-The ``push``, ``source`` and ``snap`` jobs can automatically take periodic snapshots of the filesystems matched by the ``filesystems`` filter field.
-The snapshot names are composed of a user-defined prefix followed by a UTC date formatted like ``20060102_150405_000``.
-We use UTC because it will avoid name conflicts when switching time zones or between summer and winter time.
+You can configure zrepl to take snapshots of the filesystems in the ``filesystems`` field specified in ``push``, ``source`` and ``snap`` jobs.
 
-When a job is started, the snapshotter attempts to get the snapshotting rhythms of the matched ``filesystems`` in sync because snapshotting all filesystems at the same time results in a more consistent backup.
-To find that sync point, the most recent snapshot, made by the snapshotter, in any of the matched ``filesystems`` is used.
-A filesystem that does not have snapshots by the snapshotter has lower priority than filesystem that do, and thus might not be snapshotted (and replicated) until it is snapshotted at the next sync point.
+The following snapshotting types are supported:
 
-For ``push`` jobs, replication is automatically triggered after all filesystems have been snapshotted.
 
-Note that the ``zrepl signal wakeup JOB`` subcommand does not trigger snapshotting.
+.. list-table::
+    :widths: 20 70
+    :header-rows: 1
 
+    * - ``snapshotting.type``
+      - Comment
+    * - ``periodic``
+      - Ensure that snapshots are taken at a particular interval.
+    * - ``cron``
+      - Use cron spec to take snapshots at particular points in time.
+    * - ``manual``
+      - zrepl does not take any snapshots by itself.
+
+The ``periodic`` and ``cron`` snapshotting types share some common options and behavior:
+
+* **Naming:** The snapshot names are composed of a user-defined ``prefix`` followed by a UTC date formatted like ``20060102_150405_000``.
+  We use UTC because it will avoid name conflicts when switching time zones or between summer and winter time.
+* **Hooks:** You can configure hooks to run before or after zrepl takes the snapshots. See :ref:`below <job-snapshotting-hooks>` for details.
+* **Push replication:** After creating all snapshots, the snapshotter will wake up the replication part of the job, if it's a ``push`` job.
+  Note that snapshotting is decoupled from replication, i.e., if it is down or takes too long, snapshots will still be taken.
+  Note further that other jobs are not woken up by snapshotting.
+
+.. NOTE::
+
+   There is **no concept of ownership** of the snapshots that are created by ``periodic`` or ``cron``.
+   Thus, there is no distinction between zrepl-created snapshots and user-created snapshots during replication or pruning.
+
+   In particular, pruning will take all snapshots into consideration by default.
+   To constrain pruning to just zrepl-created snapshots:
+
+     1. Assign a unique `prefix` to the snapshotter and
+     2. Use the ``regex`` functionality of the various pruning ``keep`` rules to just consider snapshots with that prefix.
+
+  There is currently no way to constrain replication to just zrepl-created snapshots.
+  Follow and comment at :issue:`403` if you need this functionality.
+
+.. NOTE::
+
+  The ``zrepl signal wakeup JOB`` subcommand does not trigger snapshotting.
+
+``periodic`` Snapshotting
+-------------------------
 
 ::
 
-    jobs:
-    - type: push
-      filesystems: {
-        "<": true,
-        "tmp": false
-      }
-      snapshotting:
-        type: periodic
-        prefix: zrepl_
-        interval: 10m
-        hooks: ...
-      ...
+   jobs:
+   - ...
+     filesystems: { ... }
+     snapshotting:
+       type: periodic
+       prefix: zrepl_
+       interval: 10m
+       # Timestamp format that is used as snapshot suffix.
+       # Can be any of "dense" (default), "human", "iso-8601", "unix-seconds" or a custom Go time format (see https://go.dev/src/time/format.go)
+       timestamp_format: dense
+       hooks: ...
+    pruning: ...
 
-There is also a ``manual`` snapshotting type, which covers the following use cases:
+The ``periodic`` snapshotter ensures that snapshots are taken in the specified ``interval``.
+If you use zrepl for backup, this translates into your recovery point objective (RPO).
+To meet your RPO, you still need to monitor that replication, which happens asynchronously to snapshotting, actually works.
 
-* Existing infrastructure for automatic snapshots: you only want to use this zrepl job for replication.
-* Handling snapshotting through a separate ``snap`` job.
+It is desirable to get all ``filesystems`` snapshotted simultaneously because it results in a more consistent backup.
+To accomplish this while still maintaining the ``interval``, the ``periodic`` snapshotter attempts to get the snapshotting rhythms in sync.
+To find that sync point, the most recent snapshot, created by the snapshotter, in any of the matched ``filesystems`` is used.
+A filesystem that does not have snapshots by the snapshotter has lower priority than filesystem that do, and thus might not be snapshotted (and replicated) until it is snapshotted at the next sync point.
+The snapshotter uses the ``prefix`` to identify which snapshots it created.
 
-Note that you will have to trigger replication manually using the ``zrepl signal wakeup JOB`` subcommand in that case.
+.. _job-snapshotting--cron:
+
+``cron`` Snapshotting
+---------------------
+
+::
+
+   jobs:
+   - type: snap
+     filesystems: { ... }
+     snapshotting:
+       type: cron
+       prefix: zrepl_
+       # (second, optional) minute hour day-of-month month day-of-week
+       # This example takes snapshots daily at 3:00.
+       cron: "0 3 * * *"
+       # Timestamp format that is used as snapshot suffix.
+       # Can be any of "dense" (default), "human", "iso-8601", "unix-seconds" or a custom Go time format (see https://go.dev/src/time/format.go)
+       timestamp_format: dense
+     pruning: ...
+
+In ``cron`` mode, the snapshotter takes snaphots at fixed points in time.
+See https://en.wikipedia.org/wiki/Cron for details on the syntax.
+zrepl uses the ``the github.com/robfig/cron/v3`` Go package for parsing.
+An optional field for "seconds" is supported to take snapshots at sub-minute frequencies.
+
+.. _job-snapshotting-timestamp_format:
+
+Timestamp Format
+~~~~~~~~~~~~~~~~
+
+The ``cron`` and ``periodic`` snapshotter support configuring a custom timestamp format that is used as suffix for the snapshot name.
+It can be used by setting ``timestamp_format`` to any of the following values:
+
+* ``dense`` (default) looks like ``20060102_150405_000``
+* ``human`` looks like ``2006-01-02_15:04:05``
+* ``iso-8601`` looks like ``2006-01-02T15:04:05.000Z``
+* ``unix-seconds`` looks like ``1136214245``
+* Any custom Go time format accepted by `time.Time#Format <https://go.dev/src/time/format.go>`_.
+
+
+``manual`` Snapshotting
+-----------------------
 
 ::
 
    jobs:
    - type: push
-     filesystems: {
-       "<": true,
-       "tmp": false
-     }
      snapshotting:
        type: manual
      ...
 
+In ``manual`` mode, zrepl does not take snapshots by itself.
+Manual snapshotting is most useful if you have existing infrastructure for snapshot management.
+Or, if you want to decouple snapshot management from replication using a zrepl ``snap`` job.
+See :ref:`this quickstart guide <quickstart-backup-to-external-disk>` for an example.
+
+To trigger replication after taking snapshots, use the ``zrepl signal wakeup JOB`` command.
+
 .. _job-snapshotting-hooks:
 
 Pre- and Post-Snapshot Hooks

docs/global.rst.inc

@@ -5,7 +5,7 @@
 
 .. |GitHub license| image:: https://img.shields.io/github/license/zrepl/zrepl.svg
    :target: https://github.com/zrepl/zrepl/blob/master/LICENSE
-.. |Language: Go| image:: https://img.shields.io/badge/language-Go-6ad7e5.svg
+.. |Language: Go| image:: https://img.shields.io/badge/lang-Go-6ad7e5.svg
    :target: https://golang.org/
 .. |User Docs| image:: https://img.shields.io/badge/docs-web-blue.svg
    :target: https://zrepl.github.io
@@ -13,13 +13,14 @@
    :target: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=R5QSXJVYHGX96
 .. |Donate via Liberapay| image:: https://img.shields.io/liberapay/patrons/zrepl.svg?logo=liberapay
    :target: https://liberapay.com/zrepl/donate
-.. |Donate via Patreon| image:: https://img.shields.io/badge/dynamic/json?color=yellow&label=Patreon&query=data.attributes.patron_count&suffix=%20patrons&url=https%3A%2F%2Fwww.patreon.com%2Fapi%2Fcampaigns%2F3095079
+.. |Donate via Patreon| image:: https://img.shields.io/badge/dynamic/json?color=yellow&label=Patreon&query=data.attributes.patron_count&url=https%3A%2F%2Fwww.patreon.com%2Fapi%2Fcampaigns%2F3095079
    :target: https://www.patreon.com/zrepl
 .. |Donate via GitHub Sponsors| image:: https://img.shields.io/static/v1?label=Sponsor&message=%E2%9D%A4&logo=GitHub&style=flat&color=yellow
    :target: https://github.com/sponsors/problame
 .. |Twitter| image:: https://img.shields.io/twitter/url/https/github.com/zrepl/zrepl.svg?style=social
    :target: https://twitter.com/intent/tweet?text=Wow:&url=https%3A%2F%2Fgithub.com%2Fzrepl%2Fzrepl
-
+.. |Matrix| image:: https://img.shields.io/badge/chat-matrix-blue.svg
+   :target: https://matrix.to/#/#zrepl:matrix.org
 
 .. |serve-transport| replace:: :ref:`serve specification<transport>`
 .. |connect-transport| replace:: :ref:`connect specification<transport>`

docs/index.rst

@@ -5,7 +5,7 @@
 
 .. include:: global.rst.inc
 
-|GitHub license| |Language: Go| |Twitter| |Donate via Patreon| |Donate via GitHub Sponsors| |Donate via Liberapay| |Donate via PayPal|
+|GitHub license| |Language: Go| |Twitter| |Donate via Patreon| |Donate via GitHub Sponsors| |Donate via Liberapay| |Donate via PayPal| |Matrix|
 
 
 zrepl - ZFS replication
@@ -137,5 +137,6 @@ Table of Contents
    pr
    changelog
    GitHub Repository & Issue Tracker <https://github.com/zrepl/zrepl>
+   Chat: Matrix <https://matrix.to/#/#zrepl:matrix.org>
    supporters
 

docs/quickstart.rst

@@ -33,6 +33,7 @@ Keep the :ref:`full config documentation <configuration_toc>` handy if a config
 
    quickstart/continuous_server_backup
    quickstart/backup_to_external_disk
+   quickstart/fan_out_replication
 
 Use ``zrepl configcheck`` to validate your configuration.
 No output indicates that everything is fine.

docs/quickstart/backup_to_external_disk.rst

@@ -13,7 +13,7 @@ Thus, we only keep one hour worth of high-resolution snapshots, then fade them o
 
 At the end of each work day, we connect our external disk that serves as our workstation's local offline backup.
 We want zrepl to inspect the filesystems and snapshots on the external pool, figure out which snapshots were created since the last time we connected the external disk, and use incremental replication to efficiently mirror our workstation to our backup disk.
-Afterwards, we want to clean up old snapshots on the backup pool: we want to keep all snapshots younger than one hour, 24 for each hor of the first day, then 360 daily backups.
+Afterwards, we want to clean up old snapshots on the backup pool: we want to keep all snapshots younger than one hour, 24 for each hour of the first day, then 360 daily backups.
 
 A few additional requirements:
 

docs/quickstart/continuous_server_backup.rst

@@ -9,13 +9,13 @@ This config example shows how we can backup our ZFS-based server to another mach
 
 * Production server ``prod`` with filesystems to back up:
 
-  * ``zroot/var/db``
-  * ``zroot/usr/home`` and all its child filesystems
-  * **except** ``zroot/usr/home/paranoid`` belonging to a user doing backups themselves
+  * The entire pool ``zroot``
+  * except ``zroot/var/tmp`` and all child datasets of it
+  * and except ``zroot/usr/home/paranoid`` which belongs to a user doing backups themselves.
 
-* Backup server ``backups`` with
+* Backup server ``backups`` with a dataset sub-tree for use by zrepl:
 
-  * Filesystem ``storage/zrepl/sink/prod`` + children dedicated to backups of ``prod``
+  * In our example, that will be ``storage/zrepl/sink/prod``.
 
 Our backup solution should fulfill the following requirements:
 

docs/quickstart/fan_out_replication.rst

@@ -0,0 +1,93 @@
+.. include:: ../global.rst.inc
+
+.. _quickstart-fan-out-replication:
+
+Fan-out replication
+===================
+
+This quick-start example demonstrates how to implement a fan-out replication setup where datasets on a server (A) are replicated to multiple targets (B, C, etc.).
+
+This example uses multiple ``source`` jobs on server A and ``pull`` jobs on the target servers.
+
+.. WARNING::
+
+   Before implementing this setup, please see the caveats listed in the :ref:`fan-out replication configuration overview <fan-out-replication>`.
+
+Overview
+--------
+
+On the source server (A), there should be:
+
+* A ``snap`` job
+
+  * Creates the snapshots
+  * Handles the pruning of snapshots
+
+* A ``source`` job for target B
+
+  * Accepts connections from server B and B only
+
+* Further ``source`` jobs for each additional target (C, D, etc.)
+
+  * Listens on a unique port
+  * Only accepts connections from the specific target
+
+On each target server, there should be:
+
+* A ``pull`` job that connects to the corresponding ``source`` job on A
+
+  * ``prune_sender`` should keep all snapshots since A's ``snap`` job handles the pruning
+  * ``prune_receiver`` can be configured as appropriate on each target server
+
+Generate TLS Certificates
+-------------------------
+
+Mutual TLS via the :ref:`TLS client authentication transport <transport-tcp+tlsclientauth>` can be used to secure the connections between the servers. In this example, a self-signed certificate is created for each server without setting up a CA.
+
+.. code-block:: bash
+
+    source=a.example.com
+    targets=(
+        b.example.com
+        c.example.com
+        # ...
+    )
+
+    for server in "${source}" "${targets[@]}"; do
+        openssl req -x509 -sha256 -nodes \
+            -newkey rsa:4096 \
+            -days 365 \
+            -keyout "${server}.key" \
+            -out "${server}.crt" \
+            -addext "subjectAltName = DNS:${server}" \
+            -subj "/CN=${server}"
+    done
+
+    # Distribute each host's keypair
+    for server in "${source}" "${targets[@]}"; do
+        ssh root@"${server}" mkdir /etc/zrepl
+        scp "${server}".{crt,key} root@"${server}":/etc/zrepl/
+    done
+
+    # Distribute target certificates to the source
+    scp "${targets[@]/%/.crt}" root@"${source}":/etc/zrepl/
+
+    # Distribute source certificate to the targets
+    for server in "${targets[@]}"; do
+        scp "${source}.crt" root@"${server}":/etc/zrepl/
+    done
+
+Configure source server A
+-------------------------
+
+.. literalinclude:: ../../config/samples/quickstart_fan_out_replication_source.yml
+
+Configure each target server
+----------------------------
+
+.. literalinclude:: ../../config/samples/quickstart_fan_out_replication_target.yml
+
+Go Back To Quickstart Guide
+---------------------------
+
+:ref:`Click here <quickstart-apply-config>` to go back to the quickstart guide.

docs/requirements.txt

@@ -25,6 +25,6 @@ sphinxcontrib-htmlhelp==1.0.2
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
--e git://github.com/rwblair/sphinxcontrib-versioning.git@7e3885a389a809e17ea55261316b7b0e98dbf98f#egg=sphinxcontrib-versioning
+git+https://github.com/rwblair/sphinxcontrib-versioning.git@7e3885a389a809e17ea55261316b7b0e98dbf98f#egg=sphinxcontrib-versioning
 sphinxcontrib-websupport==1.1.2
 urllib3==1.25.3

docs/usage.rst

@@ -26,7 +26,7 @@ CLI Overview
     * - ``zrepl daemon``
       - run the daemon, required for all zrepl functionality
     * - ``zrepl status``
-      - show job activity, or with ``--raw`` for JSON output
+      - show job activity, or with ``--mode raw`` for JSON output
     * - ``zrepl stdinserver``
       - see :ref:`transport-ssh+stdinserver`
     * - ``zrepl signal wakeup JOB``

endpoint/endpoint.go

@@ -105,15 +105,10 @@ func (s *Sender) ListFilesystems(ctx context.Context, r *pdu.ListFilesystemReq)
 	}
 	rfss := make([]*pdu.Filesystem, len(fss))
 	for i := range fss {
-		encEnabled, err := zfs.ZFSGetEncryptionEnabled(ctx, fss[i].ToString())
-		if err != nil {
-			return nil, errors.Wrap(err, "cannot get filesystem encryption status")
-		}
 		rfss[i] = &pdu.Filesystem{
 			Path: fss[i].ToString(),
 			// ResumeToken does not make sense from Sender
 			IsPlaceholder: false, // sender FSs are never placeholders
-			IsEncrypted:   encEnabled,
 		}
 	}
 	res := &pdu.ListFilesystemRes{Filesystems: rfss}
@@ -165,23 +160,6 @@ func (s *Sender) sendMakeArgs(ctx context.Context, r *pdu.SendReq) (sendArgs zfs
 	if err != nil {
 		return sendArgs, err
 	}
-	switch r.Encrypted {
-	case pdu.Tri_DontCare:
-		// use s.encrypt setting
-		// ok, fallthrough outer
-	case pdu.Tri_False:
-		if s.config.Encrypt.B {
-			return sendArgs, errors.New("only encrypted sends allowed (send -w + encryption!= off), but unencrypted send requested")
-		}
-		// fallthrough outer
-	case pdu.Tri_True:
-		if !s.config.Encrypt.B {
-			return sendArgs, errors.New("only unencrypted sends allowed, but encrypted send requested")
-		}
-		// fallthrough outer
-	default:
-		return sendArgs, fmt.Errorf("unknown pdu.Tri variant %q", r.Encrypted)
-	}
 
 	sendArgsUnvalidated := zfs.ZFSSendArgsUnvalidated{
 		FS:   r.Filesystem,
@@ -461,7 +439,7 @@ type FSMap interface { // FIXME unused
 }
 
 // NOTE: when adding members to this struct, remember
-//       to add them to `ReceiverConfig.copyIn()`
+// to add them to `ReceiverConfig.copyIn()`
 type ReceiverConfig struct {
 	JobID JobID
 
@@ -658,11 +636,6 @@ func (s *Receiver) ListFilesystems(ctx context.Context, req *pdu.ListFilesystemR
 			l.WithError(err).Error("cannot get receive resume token")
 			return nil, err
 		}
-		encEnabled, err := zfs.ZFSGetEncryptionEnabled(ctx, a.ToString())
-		if err != nil {
-			l.WithError(err).Error("cannot get encryption enabled status")
-			return nil, err
-		}
 		l.WithField("receive_resume_token", token).Debug("receive resume token")
 
 		a.TrimPrefix(root)
@@ -671,7 +644,6 @@ func (s *Receiver) ListFilesystems(ctx context.Context, req *pdu.ListFilesystemR
 			Path:          a.ToString(),
 			IsPlaceholder: ph.IsPlaceholder,
 			ResumeToken:   token,
-			IsEncrypted:   encEnabled,
 		}
 		fss = append(fss, fs)
 	}

endpoint/endpoint_zfs_abstraction.go

@@ -168,7 +168,7 @@ func (s AbstractionTypeSet) String() string {
 	for i := range s {
 		sts = append(sts, string(i))
 	}
-	sts = sort.StringSlice(sts)
+	sort.Strings(sts)
 	return strings.Join(sts, ",")
 }
 
@@ -516,10 +516,12 @@ func (e ListAbstractionsErrors) Error() string {
 }
 
 func ListAbstractions(ctx context.Context, query ListZFSHoldsAndBookmarksQuery) (out []Abstraction, outErrs []ListAbstractionsError, err error) {
-	outChan, outErrsChan, err := ListAbstractionsStreamed(ctx, query)
+	outChan, outErrsChan, drainDone, err := ListAbstractionsStreamed(ctx, query)
 	if err != nil {
 		return nil, nil, err
 	}
+	defer drainDone()
+
 	var wg sync.WaitGroup
 	wg.Add(1)
 	go func() {
@@ -540,19 +542,20 @@ func ListAbstractions(ctx context.Context, query ListZFSHoldsAndBookmarksQuery)
 }
 
 // if err != nil, the returned channels are both nil
-// if err == nil, both channels must be fully drained by the caller to avoid leaking goroutines
-func ListAbstractionsStreamed(ctx context.Context, query ListZFSHoldsAndBookmarksQuery) (<-chan Abstraction, <-chan ListAbstractionsError, error) {
+// if err == nil, both channels must be fully drained by the caller to avoid leaking goroutines.
+// After draining is done, the caller must call the returned drainDone func.
+func ListAbstractionsStreamed(ctx context.Context, query ListZFSHoldsAndBookmarksQuery) (_ <-chan Abstraction, _ <-chan ListAbstractionsError, drainDone func(), _ error) {
 
 	// impl note: structure the query processing in such a way that
 	// a minimum amount of zfs shell-outs needs to be done
 
 	if err := query.Validate(); err != nil {
-		return nil, nil, errors.Wrap(err, "validate query")
+		return nil, nil, nil, errors.Wrap(err, "validate query")
 	}
 
 	fss, err := query.FS.Filesystems(ctx)
 	if err != nil {
-		return nil, nil, errors.Wrap(err, "list filesystems")
+		return nil, nil, nil, errors.Wrap(err, "list filesystems")
 	}
 
 	outErrs := make(chan ListAbstractionsError)
@@ -574,7 +577,6 @@ func ListAbstractionsStreamed(ctx context.Context, query ListZFSHoldsAndBookmark
 	sem := semaphore.New(int64(query.Concurrency))
 	ctx, endTask := trace.WithTask(ctx, "list-abstractions-streamed-producer")
 	go func() {
-		defer endTask()
 		defer close(out)
 		defer close(outErrs)
 
@@ -596,7 +598,11 @@ func ListAbstractionsStreamed(ctx context.Context, query ListZFSHoldsAndBookmark
 		}
 	}()
 
-	return out, outErrs, nil
+	drainDone = func() {
+		endTask()
+	}
+
+	return out, outErrs, drainDone, nil
 }
 
 func listAbstractionsImplFS(ctx context.Context, fs string, query *ListZFSHoldsAndBookmarksQuery, emitCandidate putListAbstraction, errCb putListAbstractionErr) {
@@ -813,7 +819,7 @@ func listStaleFiltering(abs []Abstraction, sinceBound *CreateTXGRangeBound) *Sta
 		l := by[k]
 
 		if k.Type == AbstractionStepHold {
-			// all older than the most recent cursor are stale, others are always live
+			// all step holds older than the most recent cursor are stale, others are always live
 
 			// if we don't have a replication cursor yet, use untilBound = nil
 			// to consider all steps stale (...at first)
@@ -821,11 +827,10 @@ func listStaleFiltering(abs []Abstraction, sinceBound *CreateTXGRangeBound) *Sta
 			{
 				sfnsc := stepFirstNotStaleCandidates[k.fsAndJobId]
 
-				// if there's a replication cursor, use it as a cutoff between live and stale
-				// if there's none, we are in initial replication and only need to keep
-				// the most recent step hold live, since that's what our initial replication strategy
-				// uses (both initially and on resume)
-				// (FIXME hardcoded replication strategy)
+				// If there's a replication cursor, use it as a cutoff between live and stale
+				// for both cursors and holds.
+				// If there's no cursor, we are in initial replication and only need to keep
+				// the most recent step hold live, which hold the .To of the initial send step.
 				if sfnsc.cursor != nil {
 					untilBound = &CreateTXGRangeBound{
 						CreateTXG: (*sfnsc.cursor).GetCreateTXG(),
@@ -858,7 +863,7 @@ func listStaleFiltering(abs []Abstraction, sinceBound *CreateTXGRangeBound) *Sta
 			}
 
 		} else if k.Type == AbstractionReplicationCursorBookmarkV2 || k.Type == AbstractionLastReceivedHold {
-			// all but the most recent are stale by definition (we always _move_ them)
+			// all cursors but the most recent cursor are stale by definition (we always _move_ them)
 			// NOTE: must not use firstNotStale in this branch, not computed for these types
 
 			// sort descending (highest createtxg first), then cut off

endpoint/endpoint_zfs_abstraction_replication_cursor.go

@@ -23,7 +23,7 @@ func replicationCursorBookmarkNameImpl(fs string, guid uint64, jobid string) (st
 
 var ErrV1ReplicationCursor = fmt.Errorf("bookmark name is a v1-replication cursor")
 
-//err != nil always means that the bookmark is not a valid replication bookmark
+// err != nil always means that the bookmark is not a valid replication bookmark
 //
 // Returns ErrV1ReplicationCursor as error if the bookmark is a v1 replication cursor
 func ParseReplicationCursorBookmarkName(fullname string) (uint64, JobID, error) {

go.mod

@@ -15,14 +15,12 @@ require (
 	github.com/google/uuid v1.1.2
 	github.com/jinzhu/copier v0.0.0-20170922082739-db4671f3a9b8
 	github.com/juju/ratelimit v1.0.1
-	github.com/kisielk/gotool v1.0.0 // indirect
+	github.com/k0kubun/colorstring v0.0.0-20150214042306-9440f1994b88 // indirect
 	github.com/kr/pretty v0.1.0
 	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/lib/pq v1.2.0
 	github.com/mattn/go-colorable v0.1.4 // indirect
 	github.com/mattn/go-isatty v0.0.8
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // // go1.12 mod tidy adds this dependency as 'indirect', but go1.13 mod tidy removes it if the trailing comment is 'indirect' => add this comment to make the build work without changing go.mod on both go1.12 and go1.13
-	github.com/modern-go/reflect2 v1.0.1 // go1.12 mod tidy adds this dependency as 'indirect', but go1.13 mod tidy removes it if the trailing comment is 'indirect' => add this comment to make the build work without changing go.mod on both go1.12 and go1.13
 	github.com/montanaflynn/stats v0.5.0
 	github.com/onsi/ginkgo v1.10.2 // indirect
 	github.com/onsi/gomega v1.7.0 // indirect
@@ -31,21 +29,23 @@ require (
 	github.com/problame/go-netssh v0.0.0-20200601114649-26439f9f0dc5
 	github.com/prometheus/client_golang v1.2.1
 	github.com/prometheus/common v0.7.0
-	github.com/sergi/go-diff v1.0.1-0.20180205163309-da645544ed44 // go1.12 thinks it needs this
+	github.com/robfig/cron/v3 v3.0.1
+	github.com/sergi/go-diff v1.0.1-0.20180205163309-da645544ed44 // indirect; go1.12 thinks it needs this
 	github.com/spf13/cobra v0.0.2
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.6.1
 	github.com/willf/bitset v1.1.10
 	github.com/yudai/gojsondiff v0.0.0-20170107030110-7b1b7adf999d
-	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // go1.12 thinks it needs this
+	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // indirect; go1.12 thinks it needs this
+	github.com/yudai/pp v2.0.1+incompatible // indirect
 	github.com/zrepl/yaml-config v0.0.0-20191220194647-cbb6b0cf4bdd
 	gitlab.com/tslocum/cview v1.5.3
 	golang.org/x/net v0.0.0-20210119194325-5f4716e94777
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
 	golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135
-	gonum.org/v1/gonum v0.7.0 // indirect
 	google.golang.org/genproto v0.0.0-20210122163508-8081c04a3579 // indirect
 	google.golang.org/grpc v1.35.0
 	google.golang.org/protobuf v1.25.0
+	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
 )

go.sum

@@ -1,20 +1,12 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/DATA-DOG/go-sqlmock v1.3.3 h1:CWUqKXe0s8A2z6qCgkP4Kru7wC11YoAnoupUKFDnH08=
 github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
-github.com/OpenPeeDeeP/depguard v0.0.0-20180806142446-a69c782687b2/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
-github.com/OpenPeeDeeP/depguard v0.0.0-20181229194401-1f388ab2d810/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
-github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
-github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 h1:Hs82Z41s6SdL1CELW+XaDYmOH4hkBN4/N9og/AsOv7E=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alvaroloes/enumer v1.1.1/go.mod h1:FxrjvuXoDAx9isTJrv4c+T410zFi0DtXIT0m65DJ+Wo=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -24,9 +16,6 @@ github.com/cespare/xxhash/v2 v2.1.0 h1:yTUvW7Vhb89inJ+8irsUqiWjh8iT6sQPZiQzI6ReG
 github.com/cespare/xxhash/v2 v2.1.0/go.mod h1:dgIUBU3pDso/gPgZ1osOZ0iQf77oPR28Tjxl5dIMyVM=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -34,10 +23,8 @@ github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymF
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/fatih/color v1.6.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
-github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ftrvxmtrx/fd v0.0.0-20150925145434-c6d800382fff h1:zk1wwii7uXmI0znwU+lqg+wFL9G5+vm5I+9rv2let60=
@@ -46,24 +33,18 @@ github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdk
 github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
 github.com/gdamore/tcell v1.2.0 h1:ikixzsxc8K8o3V2/CEmyoEW8mJZaNYQQ3NP3VIQdUe4=
 github.com/gdamore/tcell v1.2.0/go.mod h1:Hjvr+Ofd+gLglo7RYKxxnzCBmev3BzsS67MebKS4zMM=
-github.com/gdamore/tcell v1.4.0 h1:vUnHwJRvcPQa3tzi+0QI4U9JINXYJlOz9yiaiPQ2wMU=
 github.com/gdamore/tcell/v2 v2.0.0-dev/go.mod h1:vSVL/GV5mCSlPC6thFP5kfOFdM9MGZcalipmpTxTgQA=
 github.com/gdamore/tcell/v2 v2.1.1-0.20201225194624-29bb185874fd/go.mod h1:vSVL/GV5mCSlPC6thFP5kfOFdM9MGZcalipmpTxTgQA=
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@@ -76,86 +57,30 @@ github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn
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@@ -394,23 +220,16 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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@@ -419,59 +238,30 @@ golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7w
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-golang.org/x/tools v0.0.0-20181117154741-2ddaf7f79a09/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20181205014116-22934f0fdb62/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190110163146-51295c7ec13a/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190121143147-24cd39ecf745/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190206041539-40960b6deb8e h1:Io7mpb+aUAGF0MKxbyQ7HQl1VgB+cL6ZJZUFaFNqVV4=
-golang.org/x/tools v0.0.0-20190206041539-40960b6deb8e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190213192042-740235f6c0d8/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190311215038-5c2858a9cfe5/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190322203728-c1a832b0ad89/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190521203540-521d6ed310dd/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135 h1:5Beo0mZN8dRzgrMMkDp0jc8YXQKx9DiJ2k1dkvGsn5A=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/tools v0.0.0-20190524210228-3d17549cdc6b/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-gonum.org/v1/gonum v0.0.0-20180816165407-929014505bf4/go.mod h1:Y+Yx5eoAFn32cQvJDxZx5Dpnq+c3wtXuadVZAcxbbBo=
-gonum.org/v1/gonum v0.7.0 h1:Hdks0L0hgznZLG9nzXb8vZ0rRvqNvAcgAp84y7Mwkgw=
-gonum.org/v1/gonum v0.7.0/go.mod h1:L02bwd0sqlsvRv41G7wGWFCsVNZFv/k1xzGIxeANHGM=
-gonum.org/v1/netlib v0.0.0-20190313105609-8cb42192e0e0/go.mod h1:wa6Ws7BG/ESfp6dHfk7C6KdzKA7wR7u/rKwOGE66zvw=
-gonum.org/v1/plot v0.0.0-20190515093506-e2840ee46a6b/go.mod h1:Wt8AAjI+ypCyYX3nZBvf6cAIx93T+c/OS2HFAYskSZc=
-google.golang.org/appengine v1.1.0 h1:igQkv0AAhEIvTEpD5LIpAfav2eeVO9HBTjvKHVJPRSs=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898 h1:yvw+zsSmSM02Z5H3ZdEV7B7Ql7eFrjQTnmByJvK+3J8=
-google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 h1:+kGHl1aib/qcwaRi1CbqBZ1rk19r85MNUf8HaBghugY=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/genproto v0.0.0-20210122163508-8081c04a3579 h1:Iwh0ba2kTgq2Q6mJiXhzrrjD7h11nEVnbMHFmp0/HsQ=
 google.golang.org/genproto v0.0.0-20210122163508-8081c04a3579/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
-google.golang.org/grpc v1.17.0 h1:TRJYBgMclJvGYn2rIMjj+h9KtMt5r1Ij7ODVRIZkwhk=
-google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
-google.golang.org/grpc v1.27.0 h1:rRYRFMVgRv6E0D70Skyfsr28tDXIuuPZyWGMPdMcnXg=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.35.0 h1:TwIQcH3es+MojMVojxxfQ3l3OF2KzlRxML2xZq0kRo8=
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
@@ -486,32 +276,20 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
+gopkg.in/go-playground/assert.v1 v1.2.1 h1:xoYuJVE7KT85PYWrN730RguIQO0ePzVRfFMXadIrXTM=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
-mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
-mvdan.cc/unparam v0.0.0-20190209190245-fbb59629db34/go.mod h1:H6SUd1XjIs+qQCyskXg5OFSrilMRUkD8ePJpHKDPaeY=
-mvdan.cc/unparam v0.0.0-20190310220240-1b9ccfa71afe/go.mod h1:BnhuWBAqxH3+J5bDybdxgw5ZfS+DsVd4iylsKQePN8o=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
-sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=
-sourcegraph.com/sqs/pbtypes v1.0.0/go.mod h1:3AciMUv4qUuRHRHhOG4TZOB+72GdPVz5k+c648qsFS4=

platformtest/harness/harness.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"container/list"
 	"context"
 	"flag"
 	"fmt"
@@ -53,6 +54,40 @@ type HarnessArgs struct {
 	Run                   string
 }
 
+type invocation struct {
+	runFunc  tests.Case
+	idstring string
+	result   *testCaseResult
+	children map[string]*invocation
+}
+
+func newInvocation(runFunc tests.Case, id string) *invocation {
+	return &invocation{
+		runFunc:  runFunc,
+		idstring: id,
+		children: make(map[string]*invocation),
+	}
+}
+
+func (i *invocation) String() string {
+	idsuffix := ""
+	if i.idstring != "" {
+		idsuffix = fmt.Sprintf(": %s", i.idstring)
+	}
+	return fmt.Sprintf("%s%s", i.runFunc.String(), idsuffix)
+}
+
+func (i *invocation) RegisterChild(c *invocation) error {
+	if c.idstring == "" {
+		return fmt.Errorf("child must have id string")
+	}
+	if oc := i.children[c.idstring]; oc != nil {
+		return fmt.Errorf("idstring %q is already taken by %s", c.idstring, oc)
+	}
+	i.children[c.idstring] = c
+	return nil
+}
+
 func HarnessRun(args HarnessArgs) error {
 
 	runRE := regexp.MustCompile(args.Run)
@@ -79,21 +114,19 @@ func HarnessRun(args HarnessArgs) error {
 	ctx = logging.WithLoggers(ctx, logging.SubsystemLoggersWithUniversalLogger(logger))
 	ex := platformtest.NewEx(logger)
 
-	type invocation struct {
-		runFunc tests.Case
-		result  *testCaseResult
-	}
-
-	invocations := make([]*invocation, 0, len(tests.Cases))
+	testQueue := list.New()
 	for _, c := range tests.Cases {
 		if runRE.MatchString(c.String()) {
-			invocations = append(invocations, &invocation{runFunc: c})
+			testQueue.PushBack(newInvocation(c, ""))
 		}
 	}
 
-	for _, inv := range invocations {
+	completedTests := list.New()
 
-		bold.Printf("BEGIN TEST CASE %s\n", inv.runFunc.String())
+	for testQueue.Len() > 0 {
+		inv := testQueue.Remove(testQueue.Front()).(*invocation)
+
+		bold.Printf("BEGIN TEST CASE %s\n", inv)
 
 		pool, err := platformtest.CreateOrReplaceZpool(ctx, ex, args.CreateArgs)
 		if err != nil {
@@ -103,6 +136,15 @@ func HarnessRun(args HarnessArgs) error {
 		ctx := &platformtest.Context{
 			Context:     ctx,
 			RootDataset: filepath.Join(pool.Name(), "rootds"),
+			QueueSubtest: func(id string, stf func(*platformtest.Context)) {
+				stinv := newInvocation(stf, id)
+				err := inv.RegisterChild(stinv)
+				if err != nil {
+					panic(err)
+				}
+				bold.Printf(" QUEUING SUBTEST %q\n", id)
+				testQueue.PushFront(stinv)
+			},
 		}
 
 		res := runTestCase(ctx, ex, inv.runFunc)
@@ -120,6 +162,8 @@ func HarnessRun(args HarnessArgs) error {
 			panic(fmt.Sprintf("error destroying test pool: %s", err))
 		}
 
+		completedTests.PushBack(inv)
+
 		if res.failed {
 			boldRed.Printf("TEST FAILED\n")
 		} else if res.skipped {
@@ -136,7 +180,8 @@ func HarnessRun(args HarnessArgs) error {
 	var summary struct {
 		succ, fail, skip []*invocation
 	}
-	for _, inv := range invocations {
+	for completedTests.Len() > 0 {
+		inv := completedTests.Remove(completedTests.Front()).(*invocation)
 		var bucket *[]*invocation
 		if inv.result.failed {
 			bucket = &summary.fail
@@ -157,7 +202,7 @@ func HarnessRun(args HarnessArgs) error {
 		}
 		fmt.Printf("\n")
 		for _, inv := range bucket {
-			fmt.Printf("  %s\n", inv.runFunc.String())
+			fmt.Printf("  %s\n", inv)
 		}
 	}
 	printBucket("PASSING TESTS", boldGreen, summary.succ)

platformtest/platformtest.go

@@ -11,6 +11,13 @@ import (
 type Context struct {
 	context.Context
 	RootDataset string
+	// Use this callback from a top-level test case to queue the
+	// execution of sub-tests after this test case is complete.
+	//
+	// Note that the testing harness executes the subtest
+	// _after_ the current top-level test. Hence, the subtest
+	// cannot use any ZFS state of the top-level test.
+	QueueSubtest func(id string, stf func(*Context))
 }
 
 var FailNowSentinel = fmt.Errorf("platformtest: FailNow called on context")

platformtest/tests/generated_cases.go

@@ -21,6 +21,9 @@ var Cases = []Case{BatchDestroy,
 	ReplicationIncrementalCleansUpStaleAbstractionsWithoutCacheOnSecondReplication,
 	ReplicationIncrementalDestroysStepHoldsIffIncrementalStepHoldsAreDisabledButStepHoldsExist,
 	ReplicationIncrementalIsPossibleIfCommonSnapshotIsDestroyed,
+	ReplicationInitialAll,
+	ReplicationInitialFail,
+	ReplicationInitialMostRecent,
 	ReplicationIsResumableFullSend__both_GuaranteeResumability,
 	ReplicationIsResumableFullSend__initial_GuaranteeIncrementalReplication_incremental_GuaranteeIncrementalReplication,
 	ReplicationIsResumableFullSend__initial_GuaranteeResumability_incremental_GuaranteeIncrementalReplication,
@@ -33,6 +36,7 @@ var Cases = []Case{BatchDestroy,
 	ReplicationStepCompletedLostBehavior__GuaranteeResumability,
 	ResumableRecvAndTokenHandling,
 	ResumeTokenParsing,
+	SendArgsValidationEE_EncryptionAndRaw,
 	SendArgsValidationEncryptedSendOfUnencryptedDatasetForbidden__EncryptionSupported_false,
 	SendArgsValidationEncryptedSendOfUnencryptedDatasetForbidden__EncryptionSupported_true,
 	SendArgsValidationResumeTokenDifferentFilesystemForbidden,

platformtest/tests/replication.go

@@ -35,15 +35,17 @@ import (
 // of a new sender and receiver instance and one blocking invocation
 // of the replication engine without encryption
 type replicationInvocation struct {
-	sjid, rjid         endpoint.JobID
-	sfs                string
-	sfilter            *filters.DatasetMapFilter
-	rfsRoot            string
-	interceptSender    func(e *endpoint.Sender) logic.Sender
-	interceptReceiver  func(e *endpoint.Receiver) logic.Receiver
-	guarantee          *pdu.ReplicationConfigProtection
-	senderConfigHook   func(*endpoint.SenderConfig)
-	receiverConfigHook func(*endpoint.ReceiverConfig)
+	sjid, rjid             endpoint.JobID
+	sfs                    string
+	sfilter                *filters.DatasetMapFilter
+	rfsRoot                string
+	interceptSender        func(e *endpoint.Sender) logic.Sender
+	interceptReceiver      func(e *endpoint.Receiver) logic.Receiver
+	guarantee              *pdu.ReplicationConfigProtection
+	senderConfigHook       func(*endpoint.SenderConfig)
+	receiverConfigHook     func(*endpoint.ReceiverConfig)
+	plannerPolicyHook      func(*logic.PlannerPolicy)
+	skipSendArgsValidation bool
 }
 
 func (i replicationInvocation) Do(ctx *platformtest.Context) *report.Report {
@@ -91,15 +93,25 @@ func (i replicationInvocation) Do(ctx *platformtest.Context) *report.Report {
 	sender := i.interceptSender(endpoint.NewSender(senderConfig))
 	receiver := i.interceptReceiver(endpoint.NewReceiver(receiverConfig))
 	plannerPolicy := logic.PlannerPolicy{
-		EncryptedSend: logic.TriFromBool(false),
 		ReplicationConfig: &pdu.ReplicationConfig{
 			Protection: i.guarantee,
 		},
+		ConflictResolution: &logic.ConflictResolution{
+			InitialReplication: logic.InitialReplicationAutoResolutionMostRecent,
+		},
 		SizeEstimationConcurrency: 1,
 	}
+	if i.plannerPolicyHook != nil {
+		i.plannerPolicyHook(&plannerPolicy)
+	}
+
+	var doCtx context.Context = ctx
+	if i.skipSendArgsValidation {
+		doCtx = zfs.ZFSSendArgsSkipValidation(ctx)
+	}
 
 	report, wait := replication.Do(
-		ctx,
+		doCtx,
 		driver.Config{
 			MaxAttempts:              1,
 			StepQueueConcurrency:     1,
@@ -1306,3 +1318,79 @@ func ReplicationPlaceholderEncryption__EncryptOnReceiverUseCase__WorksIfConfigur
 	require.NoError(ctx, err)
 	require.Equal(ctx, rfsRoot, props.Get("encryptionroot"))
 }
+
+func replicationInitialImpl(ctx *platformtest.Context, iras logic.InitialReplicationAutoResolution, expectExactRfsSnaps []string) *report.Report {
+	// reverse order for snap names to expose sorting assumptions
+	platformtest.Run(ctx, platformtest.PanicErr, ctx.RootDataset, `
+		CREATEROOT
+		+  "sender"
+		+  "sender@3"
+		+  "sender@2"
+		+  "sender@1"
+		+  "receiver"
+		R  zfs create -p "${ROOTDS}/receiver/${ROOTDS}"
+	`)
+
+	sjid := endpoint.MustMakeJobID("sender-job")
+	rjid := endpoint.MustMakeJobID("receiver-job")
+
+	sfs := ctx.RootDataset + "/sender"
+	rfsRoot := ctx.RootDataset + "/receiver"
+
+	rep := replicationInvocation{
+		sjid:      sjid,
+		rjid:      rjid,
+		sfs:       sfs,
+		rfsRoot:   rfsRoot,
+		guarantee: pdu.ReplicationConfigProtectionWithKind(pdu.ReplicationGuaranteeKind_GuaranteeResumability),
+		plannerPolicyHook: func(pp *logic.PlannerPolicy) {
+			pp.ConflictResolution.InitialReplication = iras
+		},
+	}
+	rfs := rep.ReceiveSideFilesystem()
+
+	// first replication
+	report := rep.Do(ctx)
+	ctx.Logf("\n%s", pretty.Sprint(report))
+
+	versions, err := zfs.ZFSListFilesystemVersions(ctx, mustDatasetPath(rfs), zfs.ListFilesystemVersionsOptions{Types: zfs.Snapshots})
+	if _, ok := err.(*zfs.DatasetDoesNotExist); ok {
+		versions = nil
+	} else {
+		require.NoError(ctx, err)
+	}
+
+	bySnapName := make(map[string]int)
+	for _, v := range versions {
+		bySnapName[v.GetName()] += 1
+	}
+	for _, v := range expectExactRfsSnaps {
+		bySnapName[v] -= 1
+	}
+
+	for _, v := range bySnapName {
+		if v != 0 {
+			ctx.Logf("unexpected snaps:\n%#v", bySnapName)
+			ctx.FailNow()
+		}
+	}
+
+	return report
+}
+
+func ReplicationInitialAll(ctx *platformtest.Context) {
+	replicationInitialImpl(ctx, logic.InitialReplicationAutoResolutionAll, []string{"3", "2", "1"})
+}
+
+func ReplicationInitialMostRecent(ctx *platformtest.Context) {
+	replicationInitialImpl(ctx, logic.InitialReplicationAutoResolutionMostRecent, []string{"1"})
+}
+
+func ReplicationInitialFail(ctx *platformtest.Context) {
+	report := replicationInitialImpl(ctx, logic.InitialReplicationAutoResolutionFail, []string{})
+	require.Len(ctx, report.Attempts, 1)
+	require.Nil(ctx, report.Attempts[0].PlanError)
+	require.Len(ctx, report.Attempts[0].Filesystems, 1)
+	require.NotNil(ctx, report.Attempts[0].Filesystems[0].PlanError)
+	require.Contains(ctx, report.Attempts[0].Filesystems[0].PlanError.Err, "automatic conflict resolution for initial replication is disabled in config")
+}

platformtest/tests/sendArgsValidation.go

@@ -2,10 +2,16 @@ package tests
 
 import (
 	"fmt"
+	"path"
 
+	"github.com/kr/pretty"
 	"github.com/stretchr/testify/require"
 
+	"github.com/zrepl/zrepl/endpoint"
 	"github.com/zrepl/zrepl/platformtest"
+	"github.com/zrepl/zrepl/replication/logic"
+	"github.com/zrepl/zrepl/replication/logic/pdu"
+	"github.com/zrepl/zrepl/replication/report"
 	"github.com/zrepl/zrepl/util/nodefault"
 	"github.com/zrepl/zrepl/zfs"
 )
@@ -208,3 +214,225 @@ func SendArgsValidationResumeTokenDifferentFilesystemForbidden(ctx *platformtest
 	require.True(ctx, ok)
 	require.Equal(ctx, mismatchError.What, zfs.ZFSSendArgsResumeTokenMismatchFilesystem)
 }
+
+type sendArgsValidationEndToEndTestOutcome string
+
+const (
+	ValidationAccepts sendArgsValidationEndToEndTestOutcome = "accept"
+	ValidationRejects sendArgsValidationEndToEndTestOutcome = "rejects"
+)
+
+type sendArgsValidationEndToEndTest struct {
+	encryptedSenderFilesystem             bool
+	senderConfigHook                      func(config *endpoint.SenderConfig)
+	expectedOutcome                       sendArgsValidationEndToEndTestOutcome
+	outcomeRejectsInspectError            func(require.TestingT, *report.FilesystemReport, bool)
+	inspectReceiverFSAfterSuccessfulCycle func(rfs string)
+}
+
+func implSendArgsValidationEndToEndTest(ctx *platformtest.Context, setup sendArgsValidationEndToEndTest) {
+
+	senderEncrypted := ""
+	if setup.encryptedSenderFilesystem {
+		senderEncrypted = "encrypted"
+	}
+
+	platformtest.Run(ctx, platformtest.PanicErr, ctx.RootDataset, fmt.Sprintf(`
+		CREATEROOT
+		+  "sender" %s
+		+  "receiver"
+		R  zfs create -p "${ROOTDS}/receiver/${ROOTDS}"
+	`, senderEncrypted))
+
+	sjid := endpoint.MustMakeJobID("sender-job")
+	rjid := endpoint.MustMakeJobID("receiver-job")
+
+	sfs := ctx.RootDataset + "/sender"
+	rfsRoot := ctx.RootDataset + "/receiver"
+
+	sfsmp, err := zfs.ZFSGetMountpoint(ctx, sfs)
+	require.NoError(ctx, err)
+	require.True(ctx, sfsmp.Mounted)
+
+	// Two cycles. one initial replication, one incremental replication.
+	// Within each cycle: interrupt replication at least once.
+	// This exercises both the no-resume-token-present and the resume-token-present validation code paths.
+initial_then_incremental:
+	for i := 0; i < 2; i++ {
+		writeDummyData(path.Join(sfsmp.Mountpoint, "dummy.data"), 2*(1<<20))
+		mustSnapshot(ctx, fmt.Sprintf("%s@%d", sfs, i))
+
+		rep := replicationInvocation{
+			sjid:             sjid,
+			rjid:             rjid,
+			sfs:              sfs,
+			rfsRoot:          rfsRoot,
+			senderConfigHook: setup.senderConfigHook,
+			interceptSender: func(e *endpoint.Sender) logic.Sender {
+				return &PartialSender{Sender: e, failAfterByteCount: 1 << 20}
+			},
+			guarantee:              pdu.ReplicationConfigProtectionWithKind(pdu.ReplicationGuaranteeKind_GuaranteeResumability),
+			skipSendArgsValidation: false,
+		}
+
+		rfs := rep.ReceiveSideFilesystem()
+
+		// PartialSender interrupts after 1MiB, and we wrote 2 MiB of data
+		// => Give it 3 attempts to replicate. after that, we should have a stable outcome
+		var lastReport *report.Report
+		lastResumeToken := ""
+	interrupt_current_step:
+		for j := 0; j < 3; j++ {
+
+			lastReport = rep.Do(ctx)
+			ctx.Logf("\nreport=%s", pretty.Sprint(lastReport))
+			require.Len(ctx, lastReport.Attempts, 1)
+			require.Len(ctx, lastReport.Attempts[0].Filesystems, 1)
+			lastReportFS := lastReport.Attempts[0].Filesystems[0]
+
+			var rfsExists bool
+			rfsResumeToken, err := zfs.ZFSGetReceiveResumeTokenOrEmptyStringIfNotSupported(ctx, mustDatasetPath(rfs))
+			if err != nil {
+				_, ok := err.(*zfs.DatasetDoesNotExist) // no shadow
+				require.True(ctx, ok, "no other errors expected")
+				rfsExists = false
+				rfsResumeToken = ""
+			} else {
+				rfsExists = true
+			}
+
+			if setup.expectedOutcome == ValidationRejects {
+
+				// When expecting rejection, it should manifest immediately, before sending anything.
+				// This is tested in the j=0 iteration (for both initial and incremental repl (i=0, i=1)).
+				// But we also want to assert correct behavior in case zrepl observes resume tokens.
+				// Specifically, cases where the send parameters encoded in the token conflict with the
+				// configured encryption policy.
+				// Hence, for scenarios that are expected to reject, after we validated that they reject
+				// for the non-resuming case (j==0), fabricate a resuming scenario by temporarily disabling
+				// send args validation. After fabricating the scenario, proceed into j==1 to exercise
+				// the resume token validation.
+				if j == 0 {
+					if i == 0 {
+						require.False(ctx, rfsExists, "the sender should not have sent anything")
+					} else {
+						// we fabricate a scenario where rfsExists below, hence can't assert non-existence anymore
+					}
+
+					ctx.Logf("skipping send args validation to test resuming case")
+
+					rep.skipSendArgsValidation = true
+					setupResumeReport := rep.Do(ctx)
+					ctx.Logf("setupResumeReport=%s", pretty.Sprint(setupResumeReport))
+					rep.skipSendArgsValidation = false
+					rt, err := zfs.ZFSGetReceiveResumeTokenOrEmptyStringIfNotSupported(ctx, mustDatasetPath(rfs))
+					require.NoError(ctx, err)
+					require.NotEmpty(ctx, rt, "we disabled send args validation, so the .Do above should have resulted in a resume token on rfs")
+					lastResumeToken = rt
+					continue interrupt_current_step // next iteration will test resume case with send args validation enabled
+				} else { // j > 0
+					require.Equal(ctx, lastResumeToken, rfsResumeToken, "we expect policy to refuse replication, no progress must happen")
+					_, err := zfs.ZFSGetFilesystemVersion(ctx, fmt.Sprintf("%s@%d", rfs, i))
+					_, ok := err.(*zfs.DatasetDoesNotExist)
+					require.True(ctx, ok, "another check that no progress is happening")
+				}
+
+				setup.outcomeRejectsInspectError(ctx, lastReportFS, j == 0)
+
+				// XXX: check rejection cases for incremental replication as well
+				break initial_then_incremental
+
+			} else {
+				require.Equal(ctx, ValidationAccepts, setup.expectedOutcome)
+				_, err := zfs.ZFSGetFilesystemVersion(ctx, fmt.Sprintf("%s@%d", rfs, i))
+				_, notExist := err.(*zfs.DatasetDoesNotExist)
+				if notExist {
+					require.NotEmpty(ctx, rfsResumeToken)
+					continue interrupt_current_step // next iteration will resume
+				} else {
+					require.NoError(ctx, err)
+					// version exists
+
+					// make sure all the filesystem versions we created so far were replicated by the replication loop
+					for j := 0; j <= i; j++ {
+						_ = fsversion(ctx, rfs, fmt.Sprintf("@%d", j))
+					}
+
+					setup.inspectReceiverFSAfterSuccessfulCycle(rfs)
+					continue initial_then_incremental
+				}
+			}
+		}
+
+	}
+
+}
+
+func SendArgsValidationEE_EncryptionAndRaw(ctx *platformtest.Context) {
+	type TC struct {
+		// create sender filesystem with encryption enabled yes/no
+		SFSEnc              bool
+		SndEnc              bool // send flag
+		SndRaw              bool // send flag
+		RFSEnc              bool
+		Outcome             sendArgsValidationEndToEndTestOutcome
+		RejectErrorNoResume string
+		RejectErrorResume   string
+	}
+	tcs := []TC{
+		// Sender FS is unencrypted
+		{SFSEnc: false, SndEnc: false, SndRaw: false, RFSEnc: false, Outcome: ValidationAccepts},
+		{SFSEnc: false, SndEnc: false, SndRaw: true, RFSEnc: false, Outcome: ValidationAccepts}, // allow unencrypted raw sends (#503)
+		{SFSEnc: false, SndEnc: true, SndRaw: false, RFSEnc: false, Outcome: ValidationRejects,
+			RejectErrorNoResume: `encrypted send mandated by policy, but filesystem .* is not encrypted`,
+			RejectErrorResume:   `encrypted send mandated by policy, but filesystem .* is not encrypted`,
+		},
+		{SFSEnc: false, SndEnc: true, SndRaw: true, RFSEnc: false, Outcome: ValidationRejects,
+			RejectErrorNoResume: `encrypted send mandated by policy, but filesystem .* is not encrypted`,
+			RejectErrorResume:   `encrypted send mandated by policy, but filesystem .* is not encrypted`,
+		},
+		// Sender FS is encrypted
+		{SFSEnc: true, SndEnc: false, SndRaw: false, RFSEnc: false, Outcome: ValidationAccepts}, // passes because keys are loaded, thus can send plain.
+		{SFSEnc: true, SndEnc: false, SndRaw: true, RFSEnc: false, Outcome: ValidationRejects,
+			RejectErrorNoResume: `policy mandates raw\+unencrypted sends, but filesystem .* is encrypted`,
+			RejectErrorResume:   `resume token has rawok=true which would result in encrypted send, but policy mandates unencrypted sends only`,
+		},
+		{SFSEnc: true, SndEnc: true, SndRaw: false, RFSEnc: true, Outcome: ValidationAccepts},
+		{SFSEnc: true, SndEnc: true, SndRaw: true, RFSEnc: true, Outcome: ValidationAccepts},
+	}
+
+	for _, tc := range tcs {
+		tc := tc // closure would copy by ref otherwise
+		ctx.QueueSubtest(fmt.Sprintf("%#v", tc), func(ctx *platformtest.Context) {
+			implSendArgsValidationEndToEndTest(ctx, sendArgsValidationEndToEndTest{
+				encryptedSenderFilesystem: tc.SFSEnc,
+				senderConfigHook: func(c *endpoint.SenderConfig) {
+					c.Encrypt = &nodefault.Bool{B: tc.SndEnc}
+					c.SendRaw = tc.SndRaw
+				},
+				expectedOutcome: tc.Outcome,
+				outcomeRejectsInspectError: func(ctx require.TestingT, fr *report.FilesystemReport, isResume bool) {
+					// this callback is only called for ValidationRejects
+
+					// validation should be failing during dry send => planning stage
+					// XXX mock out ZFS to ensure we never call a zfs send that would send data
+					// if we're expecting validation to fail
+					require.Equal(ctx, report.FilesystemPlanningErrored, fr.State)
+
+					if isResume {
+						require.NotEmpty(ctx, tc.RejectErrorResume)
+						require.Regexp(ctx, tc.RejectErrorResume, fr.PlanError)
+					} else {
+						require.NotEmpty(ctx, tc.RejectErrorNoResume)
+						require.Regexp(ctx, tc.RejectErrorNoResume, fr.PlanError)
+					}
+				},
+				inspectReceiverFSAfterSuccessfulCycle: func(rfs string) {
+					enabled, err := zfs.ZFSGetEncryptionEnabled(ctx, rfs)
+					require.NoError(ctx, err)
+					require.Equal(ctx, tc.RFSEnc, enabled, "receiver filesystem encryption settings unexpected")
+				},
+			})
+		})
+	}
+}

replication/driver/replication_driver.go

@@ -797,7 +797,7 @@ func (a *attempt) errorReport() *errorReport {
 			r.byClass[class] = errs
 		}
 		for _, err := range r.flattened {
-			if neterr, ok := err.Err.(net.Error); ok && neterr.Temporary() {
+			if neterr, ok := err.Err.(net.Error); ok && neterr.Timeout() {
 				putClass(err, errorClassTemporaryConnectivityRelated)
 				continue
 			}

replication/driver/replication_driver_debug.go

@@ -13,7 +13,7 @@ func init() {
 	}
 }
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "repl: driver: %s\n", fmt.Sprintf(format, args...))
@@ -22,7 +22,7 @@ func debug(format string, args ...interface{}) {
 
 type debugFunc func(format string, args ...interface{})
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func debugPrefix(prefixFormat string, prefixFormatArgs ...interface{}) debugFunc {
 	prefix := fmt.Sprintf(prefixFormat, prefixFormatArgs...)
 	return func(format string, args ...interface{}) {

replication/logic/diff/diff.go

@@ -49,6 +49,23 @@ func (c *ConflictDiverged) Error() string {
 	return buf.String()
 }
 
+type ConflictNoSenderSnapshots struct{}
+
+func (c *ConflictNoSenderSnapshots) Error() string {
+	return "no snapshots available on sender side"
+}
+
+type ConflictMostRecentSnapshotAlreadyPresent struct {
+	SortedSenderVersions, SortedReceiverVersions []*FilesystemVersion
+	CommonAncestor                               *FilesystemVersion
+}
+
+func (c *ConflictMostRecentSnapshotAlreadyPresent) Error() string {
+	var buf strings.Builder
+	fmt.Fprintf(&buf, "the most recent sender snapshot is already present on the receiver (guid=%v, name=%q)", c.CommonAncestor.GetGuid(), c.CommonAncestor.RelName())
+	return buf.String()
+}
+
 func SortVersionListByCreateTXGThenBookmarkLTSnapshot(fsvslice []*FilesystemVersion) []*FilesystemVersion {
 	lesser := func(s []*FilesystemVersion) func(i, j int) bool {
 		return func(i, j int) bool {
@@ -71,9 +88,27 @@ func SortVersionListByCreateTXGThenBookmarkLTSnapshot(fsvslice []*FilesystemVers
 	return sorted
 }
 
-// conflict may be a *ConflictDiverged or a *ConflictNoCommonAncestor
+func StripBookmarksFromVersionList(fsvslice []*FilesystemVersion) []*FilesystemVersion {
+	fslice := make([]*FilesystemVersion, 0, len(fsvslice))
+	for _, fv := range fsvslice {
+		if fv.Type != FilesystemVersion_Bookmark {
+			fslice = append(fslice, fv)
+		}
+	}
+	return fslice
+}
+
 func IncrementalPath(receiver, sender []*FilesystemVersion) (incPath []*FilesystemVersion, conflict error) {
 
+	// Receive-side bookmarks can't be used as incremental-from,
+	// and don't cause recv to fail if there is a newer bookmark than incremetal-form on the receiver.
+	// So, simply mask them out.
+	// This will also hide them in the report, but it keeps the code in this function simple,
+	// and a user who complains about them missing in a conflict message will likely require
+	// more education about bookmarks than a slightly more accurate error message. They'll get
+	// that when they open an issue.
+	receiver = StripBookmarksFromVersionList(receiver)
+
 	receiver = SortVersionListByCreateTXGThenBookmarkLTSnapshot(receiver)
 	sender = SortVersionListByCreateTXGThenBookmarkLTSnapshot(sender)
 
@@ -98,9 +133,13 @@ findCandidate:
 
 	// handle failure cases
 	if !mrcaCandidate.found {
-		return nil, &ConflictNoCommonAncestor{
-			SortedSenderVersions:   sender,
-			SortedReceiverVersions: receiver,
+		if len(sender) == 0 {
+			return nil, &ConflictNoSenderSnapshots{}
+		} else {
+			return nil, &ConflictNoCommonAncestor{
+				SortedSenderVersions:   sender,
+				SortedReceiverVersions: receiver,
+			}
 		}
 	} else if mrcaCandidate.r != len(receiver)-1 {
 		return nil, &ConflictDiverged{
@@ -125,7 +164,11 @@ findCandidate:
 	}
 	if len(incPath) == 1 {
 		// nothing to do
-		incPath = incPath[1:]
+		return nil, &ConflictMostRecentSnapshotAlreadyPresent{
+			SortedSenderVersions:   sender,
+			SortedReceiverVersions: receiver,
+			CommonAncestor:         sender[mrcaCandidate.s],
+		}
 	}
 	return incPath, nil
 }

replication/logic/diff/diff_test.go

@@ -96,12 +96,37 @@ func TestIncrementalPath_SnapshotsOnly(t *testing.T) {
 		assert.Equal(t, l("@c,3", "@d,4"), path)
 	})
 
-	// sender with earlier but also current version as sender is not a conflict
+	// nothing to do if fully shared history
+	doTest(l("@a,1", "@b,2"), l("@a,1", "@b,2"), func(incpath []*FilesystemVersion, conflict error) {
+		assert.Nil(t, incpath)
+		assert.NotNil(t, conflict)
+		_, ok := conflict.(*ConflictMostRecentSnapshotAlreadyPresent)
+		assert.True(t, ok)
+	})
+
+	// ...but it's sufficient if the most recent snapshot is present
 	doTest(l("@c,3"), l("@a,1", "@b,2", "@c,3"), func(path []*FilesystemVersion, conflict error) {
-		t.Logf("path: %#v", path)
-		t.Logf("conflict: %#v", conflict)
-		assert.Empty(t, path)
-		assert.Nil(t, conflict)
+		assert.Nil(t, path)
+		_, ok := conflict.(*ConflictMostRecentSnapshotAlreadyPresent)
+		assert.True(t, ok)
+	})
+
+	// no sender snapshots errors: empty receiver
+	doTest(l(), l(), func(incpath []*FilesystemVersion, conflict error) {
+		assert.Nil(t, incpath)
+		assert.NotNil(t, conflict)
+		t.Logf("%T", conflict)
+		_, ok := conflict.(*ConflictNoSenderSnapshots)
+		assert.True(t, ok)
+	})
+
+	// no sender snapshots errors: snapshots on receiver
+	doTest(l("@a,1"), l(), func(incpath []*FilesystemVersion, conflict error) {
+		assert.Nil(t, incpath)
+		assert.NotNil(t, conflict)
+		t.Logf("%T", conflict)
+		_, ok := conflict.(*ConflictNoSenderSnapshots)
+		assert.True(t, ok)
 	})
 
 }
@@ -127,4 +152,18 @@ func TestIncrementalPath_BookmarkSupport(t *testing.T) {
 		assert.Equal(t, l("@a,1", "@b,2"), path)
 	})
 
+	// test that receive-side bookmarks younger than the most recent common ancestor do not cause a conflict
+	doTest(l("@a,1", "#b,2"), l("@a,1", "@c,3"), func(path []*FilesystemVersion, conflict error) {
+		assert.NoError(t, conflict)
+		require.Len(t, path, 2)
+		assert.Equal(t, l("@a,1")[0], path[0])
+		assert.Equal(t, l("@c,3")[0], path[1])
+	})
+	doTest(l("#a,1"), l("@a,1", "@b,2"), func(path []*FilesystemVersion, conflict error) {
+		assert.Nil(t, path)
+		ca, ok := conflict.(*ConflictNoCommonAncestor)
+		require.True(t, ok)
+		assert.Equal(t, l(), ca.SortedReceiverVersions, "See comment in IncrementalPath() on why we don't include the boomkmark here")
+	})
+
 }

replication/logic/initialreplicationautoresolution_enumer.go

@@ -0,0 +1,62 @@
+// Code generated by "enumer -type=InitialReplicationAutoResolution -trimprefix=InitialReplicationAutoResolution"; DO NOT EDIT.
+
+//
+package logic
+
+import (
+	"fmt"
+)
+
+const (
+	_InitialReplicationAutoResolutionName_0 = "MostRecentAll"
+	_InitialReplicationAutoResolutionName_1 = "Fail"
+)
+
+var (
+	_InitialReplicationAutoResolutionIndex_0 = [...]uint8{0, 10, 13}
+	_InitialReplicationAutoResolutionIndex_1 = [...]uint8{0, 4}
+)
+
+func (i InitialReplicationAutoResolution) String() string {
+	switch {
+	case 1 <= i && i <= 2:
+		i -= 1
+		return _InitialReplicationAutoResolutionName_0[_InitialReplicationAutoResolutionIndex_0[i]:_InitialReplicationAutoResolutionIndex_0[i+1]]
+	case i == 4:
+		return _InitialReplicationAutoResolutionName_1
+	default:
+		return fmt.Sprintf("InitialReplicationAutoResolution(%d)", i)
+	}
+}
+
+var _InitialReplicationAutoResolutionValues = []InitialReplicationAutoResolution{1, 2, 4}
+
+var _InitialReplicationAutoResolutionNameToValueMap = map[string]InitialReplicationAutoResolution{
+	_InitialReplicationAutoResolutionName_0[0:10]:  1,
+	_InitialReplicationAutoResolutionName_0[10:13]: 2,
+	_InitialReplicationAutoResolutionName_1[0:4]:   4,
+}
+
+// InitialReplicationAutoResolutionString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func InitialReplicationAutoResolutionString(s string) (InitialReplicationAutoResolution, error) {
+	if val, ok := _InitialReplicationAutoResolutionNameToValueMap[s]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to InitialReplicationAutoResolution values", s)
+}
+
+// InitialReplicationAutoResolutionValues returns all values of the enum
+func InitialReplicationAutoResolutionValues() []InitialReplicationAutoResolution {
+	return _InitialReplicationAutoResolutionValues
+}
+
+// IsAInitialReplicationAutoResolution returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i InitialReplicationAutoResolution) IsAInitialReplicationAutoResolution() bool {
+	for _, v := range _InitialReplicationAutoResolutionValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

replication/logic/pdu/pdu.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.12.4
+// 	protoc        v3.14.0
 // source: pdu.proto
 
 package pdu
@@ -25,55 +25,6 @@ const (
 // of the legacy proto package is being used.
 const _ = proto.ProtoPackageIsVersion4
 
-type Tri int32
-
-const (
-	Tri_DontCare Tri = 0
-	Tri_False    Tri = 1
-	Tri_True     Tri = 2
-)
-
-// Enum value maps for Tri.
-var (
-	Tri_name = map[int32]string{
-		0: "DontCare",
-		1: "False",
-		2: "True",
-	}
-	Tri_value = map[string]int32{
-		"DontCare": 0,
-		"False":    1,
-		"True":     2,
-	}
-)
-
-func (x Tri) Enum() *Tri {
-	p := new(Tri)
-	*p = x
-	return p
-}
-
-func (x Tri) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (Tri) Descriptor() protoreflect.EnumDescriptor {
-	return file_pdu_proto_enumTypes[0].Descriptor()
-}
-
-func (Tri) Type() protoreflect.EnumType {
-	return &file_pdu_proto_enumTypes[0]
-}
-
-func (x Tri) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use Tri.Descriptor instead.
-func (Tri) EnumDescriptor() ([]byte, []int) {
-	return file_pdu_proto_rawDescGZIP(), []int{0}
-}
-
 type ReplicationGuaranteeKind int32
 
 const (
@@ -110,11 +61,11 @@ func (x ReplicationGuaranteeKind) String() string {
 }
 
 func (ReplicationGuaranteeKind) Descriptor() protoreflect.EnumDescriptor {
-	return file_pdu_proto_enumTypes[1].Descriptor()
+	return file_pdu_proto_enumTypes[0].Descriptor()
 }
 
 func (ReplicationGuaranteeKind) Type() protoreflect.EnumType {
-	return &file_pdu_proto_enumTypes[1]
+	return &file_pdu_proto_enumTypes[0]
 }
 
 func (x ReplicationGuaranteeKind) Number() protoreflect.EnumNumber {
@@ -123,7 +74,7 @@ func (x ReplicationGuaranteeKind) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use ReplicationGuaranteeKind.Descriptor instead.
 func (ReplicationGuaranteeKind) EnumDescriptor() ([]byte, []int) {
-	return file_pdu_proto_rawDescGZIP(), []int{1}
+	return file_pdu_proto_rawDescGZIP(), []int{0}
 }
 
 type FilesystemVersion_VersionType int32
@@ -156,11 +107,11 @@ func (x FilesystemVersion_VersionType) String() string {
 }
 
 func (FilesystemVersion_VersionType) Descriptor() protoreflect.EnumDescriptor {
-	return file_pdu_proto_enumTypes[2].Descriptor()
+	return file_pdu_proto_enumTypes[1].Descriptor()
 }
 
 func (FilesystemVersion_VersionType) Type() protoreflect.EnumType {
-	return &file_pdu_proto_enumTypes[2]
+	return &file_pdu_proto_enumTypes[1]
 }
 
 func (x FilesystemVersion_VersionType) Number() protoreflect.EnumNumber {
@@ -265,7 +216,6 @@ type Filesystem struct {
 	Path          string `protobuf:"bytes,1,opt,name=Path,proto3" json:"Path,omitempty"`
 	ResumeToken   string `protobuf:"bytes,2,opt,name=ResumeToken,proto3" json:"ResumeToken,omitempty"`
 	IsPlaceholder bool   `protobuf:"varint,3,opt,name=IsPlaceholder,proto3" json:"IsPlaceholder,omitempty"`
-	IsEncrypted   bool   `protobuf:"varint,4,opt,name=IsEncrypted,proto3" json:"IsEncrypted,omitempty"`
 }
 
 func (x *Filesystem) Reset() {
@@ -321,13 +271,6 @@ func (x *Filesystem) GetIsPlaceholder() bool {
 	return false
 }
 
-func (x *Filesystem) GetIsEncrypted() bool {
-	if x != nil {
-		return x.IsEncrypted
-	}
-	return false
-}
-
 type ListFilesystemVersionsReq struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -517,7 +460,6 @@ type SendReq struct {
 	// ResumeToken is not empty, the GUIDs of From and To MUST correspond to those
 	// encoded in the ResumeToken. Otherwise, the Sender MUST return an error.
 	ResumeToken       string             `protobuf:"bytes,4,opt,name=ResumeToken,proto3" json:"ResumeToken,omitempty"`
-	Encrypted         Tri                `protobuf:"varint,5,opt,name=Encrypted,proto3,enum=Tri" json:"Encrypted,omitempty"`
 	ReplicationConfig *ReplicationConfig `protobuf:"bytes,6,opt,name=ReplicationConfig,proto3" json:"ReplicationConfig,omitempty"`
 }
 
@@ -581,13 +523,6 @@ func (x *SendReq) GetResumeToken() string {
 	return ""
 }
 
-func (x *SendReq) GetEncrypted() Tri {
-	if x != nil {
-		return x.Encrypted
-	}
-	return Tri_DontCare
-}
-
 func (x *SendReq) GetReplicationConfig() *ReplicationConfig {
 	if x != nil {
 		return x.ReplicationConfig
@@ -1396,162 +1331,155 @@ var file_pdu_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1566,71 +1494,69 @@ func file_pdu_proto_rawDescGZIP() []byte {
 	return file_pdu_proto_rawDescData
 }
 
-var file_pdu_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
+var file_pdu_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_pdu_proto_msgTypes = make([]protoimpl.MessageInfo, 22)
 var file_pdu_proto_goTypes = []interface{}{
-	(Tri)(0),                            // 0: Tri
-	(ReplicationGuaranteeKind)(0),       // 1: ReplicationGuaranteeKind
-	(FilesystemVersion_VersionType)(0),  // 2: FilesystemVersion.VersionType
-	(*ListFilesystemReq)(nil),           // 3: ListFilesystemReq
-	(*ListFilesystemRes)(nil),           // 4: ListFilesystemRes
-	(*Filesystem)(nil),                  // 5: Filesystem
-	(*ListFilesystemVersionsReq)(nil),   // 6: ListFilesystemVersionsReq
-	(*ListFilesystemVersionsRes)(nil),   // 7: ListFilesystemVersionsRes
-	(*FilesystemVersion)(nil),           // 8: FilesystemVersion
-	(*SendReq)(nil),                     // 9: SendReq
-	(*ReplicationConfig)(nil),           // 10: ReplicationConfig
-	(*ReplicationConfigProtection)(nil), // 11: ReplicationConfigProtection
-	(*Property)(nil),                    // 12: Property
-	(*SendRes)(nil),                     // 13: SendRes
-	(*SendCompletedReq)(nil),            // 14: SendCompletedReq
-	(*SendCompletedRes)(nil),            // 15: SendCompletedRes
-	(*ReceiveReq)(nil),                  // 16: ReceiveReq
-	(*ReceiveRes)(nil),                  // 17: ReceiveRes
-	(*DestroySnapshotsReq)(nil),         // 18: DestroySnapshotsReq
-	(*DestroySnapshotRes)(nil),          // 19: DestroySnapshotRes
-	(*DestroySnapshotsRes)(nil),         // 20: DestroySnapshotsRes
-	(*ReplicationCursorReq)(nil),        // 21: ReplicationCursorReq
-	(*ReplicationCursorRes)(nil),        // 22: ReplicationCursorRes
-	(*PingReq)(nil),                     // 23: PingReq
-	(*PingRes)(nil),                     // 24: PingRes
+	(ReplicationGuaranteeKind)(0),       // 0: ReplicationGuaranteeKind
+	(FilesystemVersion_VersionType)(0),  // 1: FilesystemVersion.VersionType
+	(*ListFilesystemReq)(nil),           // 2: ListFilesystemReq
+	(*ListFilesystemRes)(nil),           // 3: ListFilesystemRes
+	(*Filesystem)(nil),                  // 4: Filesystem
+	(*ListFilesystemVersionsReq)(nil),   // 5: ListFilesystemVersionsReq
+	(*ListFilesystemVersionsRes)(nil),   // 6: ListFilesystemVersionsRes
+	(*FilesystemVersion)(nil),           // 7: FilesystemVersion
+	(*SendReq)(nil),                     // 8: SendReq
+	(*ReplicationConfig)(nil),           // 9: ReplicationConfig
+	(*ReplicationConfigProtection)(nil), // 10: ReplicationConfigProtection
+	(*Property)(nil),                    // 11: Property
+	(*SendRes)(nil),                     // 12: SendRes
+	(*SendCompletedReq)(nil),            // 13: SendCompletedReq
+	(*SendCompletedRes)(nil),            // 14: SendCompletedRes
+	(*ReceiveReq)(nil),                  // 15: ReceiveReq
+	(*ReceiveRes)(nil),                  // 16: ReceiveRes
+	(*DestroySnapshotsReq)(nil),         // 17: DestroySnapshotsReq
+	(*DestroySnapshotRes)(nil),          // 18: DestroySnapshotRes
+	(*DestroySnapshotsRes)(nil),         // 19: DestroySnapshotsRes
+	(*ReplicationCursorReq)(nil),        // 20: ReplicationCursorReq
+	(*ReplicationCursorRes)(nil),        // 21: ReplicationCursorRes
+	(*PingReq)(nil),                     // 22: PingReq
+	(*PingRes)(nil),                     // 23: PingRes
 }
 var file_pdu_proto_depIdxs = []int32{
-	5,  // 0: ListFilesystemRes.Filesystems:type_name -> Filesystem
-	8,  // 1: ListFilesystemVersionsRes.Versions:type_name -> FilesystemVersion
-	2,  // 2: FilesystemVersion.Type:type_name -> FilesystemVersion.VersionType
-	8,  // 3: SendReq.From:type_name -> FilesystemVersion
-	8,  // 4: SendReq.To:type_name -> FilesystemVersion
-	0,  // 5: SendReq.Encrypted:type_name -> Tri
-	10, // 6: SendReq.ReplicationConfig:type_name -> ReplicationConfig
-	11, // 7: ReplicationConfig.protection:type_name -> ReplicationConfigProtection
-	1,  // 8: ReplicationConfigProtection.Initial:type_name -> ReplicationGuaranteeKind
-	1,  // 9: ReplicationConfigProtection.Incremental:type_name -> ReplicationGuaranteeKind
-	9,  // 10: SendCompletedReq.OriginalReq:type_name -> SendReq
-	8,  // 11: ReceiveReq.To:type_name -> FilesystemVersion
-	10, // 12: ReceiveReq.ReplicationConfig:type_name -> ReplicationConfig
-	8,  // 13: DestroySnapshotsReq.Snapshots:type_name -> FilesystemVersion
-	8,  // 14: DestroySnapshotRes.Snapshot:type_name -> FilesystemVersion
-	19, // 15: DestroySnapshotsRes.Results:type_name -> DestroySnapshotRes
-	23, // 16: Replication.Ping:input_type -> PingReq
-	3,  // 17: Replication.ListFilesystems:input_type -> ListFilesystemReq
-	6,  // 18: Replication.ListFilesystemVersions:input_type -> ListFilesystemVersionsReq
-	18, // 19: Replication.DestroySnapshots:input_type -> DestroySnapshotsReq
-	21, // 20: Replication.ReplicationCursor:input_type -> ReplicationCursorReq
-	9,  // 21: Replication.SendDry:input_type -> SendReq
-	14, // 22: Replication.SendCompleted:input_type -> SendCompletedReq
-	24, // 23: Replication.Ping:output_type -> PingRes
-	4,  // 24: Replication.ListFilesystems:output_type -> ListFilesystemRes
-	7,  // 25: Replication.ListFilesystemVersions:output_type -> ListFilesystemVersionsRes
-	20, // 26: Replication.DestroySnapshots:output_type -> DestroySnapshotsRes
-	22, // 27: Replication.ReplicationCursor:output_type -> ReplicationCursorRes
-	13, // 28: Replication.SendDry:output_type -> SendRes
-	15, // 29: Replication.SendCompleted:output_type -> SendCompletedRes
-	23, // [23:30] is the sub-list for method output_type
-	16, // [16:23] is the sub-list for method input_type
-	16, // [16:16] is the sub-list for extension type_name
-	16, // [16:16] is the sub-list for extension extendee
-	0,  // [0:16] is the sub-list for field type_name
+	4,  // 0: ListFilesystemRes.Filesystems:type_name -> Filesystem
+	7,  // 1: ListFilesystemVersionsRes.Versions:type_name -> FilesystemVersion
+	1,  // 2: FilesystemVersion.Type:type_name -> FilesystemVersion.VersionType
+	7,  // 3: SendReq.From:type_name -> FilesystemVersion
+	7,  // 4: SendReq.To:type_name -> FilesystemVersion
+	9,  // 5: SendReq.ReplicationConfig:type_name -> ReplicationConfig
+	10, // 6: ReplicationConfig.protection:type_name -> ReplicationConfigProtection
+	0,  // 7: ReplicationConfigProtection.Initial:type_name -> ReplicationGuaranteeKind
+	0,  // 8: ReplicationConfigProtection.Incremental:type_name -> ReplicationGuaranteeKind
+	8,  // 9: SendCompletedReq.OriginalReq:type_name -> SendReq
+	7,  // 10: ReceiveReq.To:type_name -> FilesystemVersion
+	9,  // 11: ReceiveReq.ReplicationConfig:type_name -> ReplicationConfig
+	7,  // 12: DestroySnapshotsReq.Snapshots:type_name -> FilesystemVersion
+	7,  // 13: DestroySnapshotRes.Snapshot:type_name -> FilesystemVersion
+	18, // 14: DestroySnapshotsRes.Results:type_name -> DestroySnapshotRes
+	22, // 15: Replication.Ping:input_type -> PingReq
+	2,  // 16: Replication.ListFilesystems:input_type -> ListFilesystemReq
+	5,  // 17: Replication.ListFilesystemVersions:input_type -> ListFilesystemVersionsReq
+	17, // 18: Replication.DestroySnapshots:input_type -> DestroySnapshotsReq
+	20, // 19: Replication.ReplicationCursor:input_type -> ReplicationCursorReq
+	8,  // 20: Replication.SendDry:input_type -> SendReq
+	13, // 21: Replication.SendCompleted:input_type -> SendCompletedReq
+	23, // 22: Replication.Ping:output_type -> PingRes
+	3,  // 23: Replication.ListFilesystems:output_type -> ListFilesystemRes
+	6,  // 24: Replication.ListFilesystemVersions:output_type -> ListFilesystemVersionsRes
+	19, // 25: Replication.DestroySnapshots:output_type -> DestroySnapshotsRes
+	21, // 26: Replication.ReplicationCursor:output_type -> ReplicationCursorRes
+	12, // 27: Replication.SendDry:output_type -> SendRes
+	14, // 28: Replication.SendCompleted:output_type -> SendCompletedRes
+	22, // [22:29] is the sub-list for method output_type
+	15, // [15:22] is the sub-list for method input_type
+	15, // [15:15] is the sub-list for extension type_name
+	15, // [15:15] is the sub-list for extension extendee
+	0,  // [0:15] is the sub-list for field type_name
 }
 
 func init() { file_pdu_proto_init() }
@@ -1913,7 +1839,7 @@ func file_pdu_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_pdu_proto_rawDesc,
-			NumEnums:      3,
+			NumEnums:      2,
 			NumMessages:   22,
 			NumExtensions: 0,
 			NumServices:   1,

replication/logic/pdu/pdu.proto

@@ -21,7 +21,6 @@ message Filesystem {
   string Path = 1;
   string ResumeToken = 2;
   bool IsPlaceholder = 3;
-  bool IsEncrypted = 4;
 }
 
 message ListFilesystemVersionsReq { string Filesystem = 1; }
@@ -40,12 +39,6 @@ message FilesystemVersion {
   string Creation = 5; // RFC 3339
 }
 
-enum Tri {
-  DontCare = 0;
-  False = 1;
-  True = 2;
-}
-
 message SendReq {
   string Filesystem = 1;
   // May be empty / null to request a full transfer of To
@@ -59,7 +52,6 @@ message SendReq {
   // ResumeToken is not empty, the GUIDs of From and To MUST correspond to those
   // encoded in the ResumeToken. Otherwise, the Sender MUST return an error.
   string ResumeToken = 4;
-  Tri Encrypted = 5;
 
   ReplicationConfig ReplicationConfig = 6;
 }

replication/logic/replication_logic.go

@@ -156,8 +156,7 @@ type Step struct {
 
 	parent      *Filesystem
 	from, to    *pdu.FilesystemVersion // from may be nil, indicating full send
-	encrypt     tri
-	resumeToken string // empty means no resume token shall be used
+	resumeToken string                 // empty means no resume token shall be used
 
 	expectedSize uint64 // 0 means no size estimate present / possible
 
@@ -201,22 +200,10 @@ func (s *Step) ReportInfo() *report.StepInfo {
 	if s.from != nil {
 		from = s.from.RelName()
 	}
-	var encrypted report.EncryptedEnum
-	switch s.encrypt {
-	case DontCare:
-		encrypted = report.EncryptedSenderDependent
-	case True:
-		encrypted = report.EncryptedTrue
-	case False:
-		encrypted = report.EncryptedFalse
-	default:
-		panic(fmt.Sprintf("unknown variant %s", s.encrypt))
-	}
 	return &report.StepInfo{
 		From:            from,
 		To:              s.to.RelName(),
 		Resumed:         s.resumeToken != "",
-		Encrypted:       encrypted,
 		BytesExpected:   s.expectedSize,
 		BytesReplicated: byteCounter,
 	}
@@ -235,25 +222,55 @@ func NewPlanner(secsPerState *prometheus.HistogramVec, bytesReplicated *promethe
 		promBytesReplicated: bytesReplicated,
 	}
 }
-func resolveConflict(conflict error) (path []*pdu.FilesystemVersion, msg string) {
+
+func tryAutoresolveConflict(conflict error, policy ConflictResolution) (path []*pdu.FilesystemVersion, reason error) {
+
+	if _, ok := conflict.(*ConflictMostRecentSnapshotAlreadyPresent); ok {
+		// replicatoin is a no-op
+		return nil, nil
+	}
+
 	if noCommonAncestor, ok := conflict.(*ConflictNoCommonAncestor); ok {
 		if len(noCommonAncestor.SortedReceiverVersions) == 0 {
-			// TODO this is hard-coded replication policy: most recent snapshot as source
-			// NOTE: Keep in sync with listStaleFiltering, it depends on this hard-coded assumption
-			var mostRecentSnap *pdu.FilesystemVersion
-			for n := len(noCommonAncestor.SortedSenderVersions) - 1; n >= 0; n-- {
-				if noCommonAncestor.SortedSenderVersions[n].Type == pdu.FilesystemVersion_Snapshot {
-					mostRecentSnap = noCommonAncestor.SortedSenderVersions[n]
-					break
+
+			if len(noCommonAncestor.SortedSenderVersions) == 0 {
+				return nil, fmt.Errorf("no snapshots available on sender side")
+			}
+
+			switch policy.InitialReplication {
+
+			case InitialReplicationAutoResolutionMostRecent:
+
+				var mostRecentSnap *pdu.FilesystemVersion
+				for n := len(noCommonAncestor.SortedSenderVersions) - 1; n >= 0; n-- {
+					if noCommonAncestor.SortedSenderVersions[n].Type == pdu.FilesystemVersion_Snapshot {
+						mostRecentSnap = noCommonAncestor.SortedSenderVersions[n]
+						break
+					}
 				}
+				return []*pdu.FilesystemVersion{nil, mostRecentSnap}, nil
+
+			case InitialReplicationAutoResolutionAll:
+
+				path = append(path, nil)
+
+				for n := 0; n < len(noCommonAncestor.SortedSenderVersions); n++ {
+					if noCommonAncestor.SortedSenderVersions[n].Type == pdu.FilesystemVersion_Snapshot {
+						path = append(path, noCommonAncestor.SortedSenderVersions[n])
+					}
+				}
+				return path, nil
+
+			case InitialReplicationAutoResolutionFail:
+
+				return nil, fmt.Errorf("automatic conflict resolution for initial replication is disabled in config")
+
+			default:
+				panic(fmt.Sprintf("unimplemented: %#v", policy.InitialReplication))
 			}
-			if mostRecentSnap == nil {
-				return nil, "no snapshots available on sender side"
-			}
-			return []*pdu.FilesystemVersion{mostRecentSnap}, fmt.Sprintf("start replication at most recent snapshot %s", mostRecentSnap.RelName())
 		}
 	}
-	return nil, "no automated way to handle conflict type"
+	return nil, conflict
 }
 
 func (p *Planner) doPlanning(ctx context.Context) ([]*Filesystem, error) {
@@ -316,10 +333,6 @@ func (fs *Filesystem) doPlanning(ctx context.Context) ([]*Step, error) {
 
 	log(ctx).Debug("assessing filesystem")
 
-	if fs.policy.EncryptedSend == True && !fs.senderFS.GetIsEncrypted() {
-		return nil, fmt.Errorf("sender filesystem is not encrypted but policy mandates encrypted send")
-	}
-
 	sfsvsres, err := fs.sender.ListFilesystemVersions(ctx, &pdu.ListFilesystemVersionsReq{Filesystem: fs.Path})
 	if err != nil {
 		log(ctx).WithError(err).Error("cannot get remote filesystem versions")
@@ -393,24 +406,7 @@ func (fs *Filesystem) doPlanning(ctx context.Context) ([]*Step, error) {
 			}
 		}
 
-		encryptionMatches := false
-		switch fs.policy.EncryptedSend {
-		case True:
-			encryptionMatches = resumeToken.RawOK && resumeToken.CompressOK
-		case False:
-			encryptionMatches = !resumeToken.RawOK && !resumeToken.CompressOK
-		case DontCare:
-			encryptionMatches = true
-		}
-
-		log(ctx).WithField("fromVersion", fromVersion).
-			WithField("toVersion", toVersion).
-			WithField("encryptionMatches", encryptionMatches).
-			Debug("result of resume-token-matching to sender's versions")
-
-		if !encryptionMatches {
-			return nil, fmt.Errorf("resume token `rawok`=%v and `compressok`=%v are incompatible with encryption policy=%v", resumeToken.RawOK, resumeToken.CompressOK, fs.policy.EncryptedSend)
-		} else if toVersion == nil {
+		if toVersion == nil {
 			return nil, fmt.Errorf("resume token `toguid` = %v not found on sender (`toname` = %q)", resumeToken.ToGUID, resumeToken.ToName)
 		} else if fromVersion == toVersion {
 			return nil, fmt.Errorf("resume token `fromguid` and `toguid` match same version on sener")
@@ -422,9 +418,8 @@ func (fs *Filesystem) doPlanning(ctx context.Context) ([]*Step, error) {
 			sender:   fs.sender,
 			receiver: fs.receiver,
 
-			from:    fromVersion,
-			to:      toVersion,
-			encrypt: fs.policy.EncryptedSend,
+			from: fromVersion,
+			to:   toVersion,
 
 			resumeToken: resumeTokenRaw,
 		}
@@ -450,47 +445,37 @@ func (fs *Filesystem) doPlanning(ctx context.Context) ([]*Step, error) {
 				receiver: fs.receiver,
 				from:     remainingSFSVs[i],
 				to:       remainingSFSVs[i+1],
-				encrypt:  fs.policy.EncryptedSend,
 			})
 		}
 	} else { // resumeToken == nil
 		path, conflict := IncrementalPath(rfsvs, sfsvs)
 		if conflict != nil {
-			var msg string
-			path, msg = resolveConflict(conflict) // no shadowing allowed!
-			if path != nil {
-				log(ctx).WithField("conflict", conflict).Info("conflict")
-				log(ctx).WithField("resolution", msg).Info("automatically resolved")
+			updPath, updConflict := tryAutoresolveConflict(conflict, *fs.policy.ConflictResolution)
+			if updConflict == nil {
+				log(ctx).WithField("conflict", conflict).Info("conflict automatically resolved")
+
 			} else {
-				log(ctx).WithField("conflict", conflict).Error("conflict")
-				log(ctx).WithField("problem", msg).Error("cannot resolve conflict")
+				log(ctx).WithField("conflict", conflict).Error("cannot resolve conflict")
 			}
+			path, conflict = updPath, updConflict
 		}
-		if len(path) == 0 {
+		if conflict != nil {
 			return nil, conflict
 		}
-
-		steps = make([]*Step, 0, len(path)) // shadow
-		if len(path) == 1 {
-			steps = append(steps, &Step{
-				parent:   fs,
-				sender:   fs.sender,
-				receiver: fs.receiver,
-
-				from:    nil,
-				to:      path[0],
-				encrypt: fs.policy.EncryptedSend,
-			})
+		if len(path) == 0 {
+			steps = nil
+		} else if len(path) == 1 {
+			panic(fmt.Sprintf("len(path) must be two for incremental repl, and initial repl must start with nil, got path[0]=%#v", path[0]))
 		} else {
+			steps = make([]*Step, 0, len(path)) // shadow
 			for i := 0; i < len(path)-1; i++ {
 				steps = append(steps, &Step{
 					parent:   fs,
 					sender:   fs.sender,
 					receiver: fs.receiver,
 
-					from:    path[i],
-					to:      path[i+1],
-					encrypt: fs.policy.EncryptedSend,
+					from: path[i], // nil in case of initial repl
+					to:   path[i+1],
 				})
 			}
 		}
@@ -570,7 +555,6 @@ func (s *Step) buildSendRequest() (sr *pdu.SendReq) {
 		Filesystem:        fs,
 		From:              s.from, // may be nil
 		To:                s.to,
-		Encrypted:         s.encrypt.ToPDU(),
 		ResumeToken:       s.resumeToken,
 		ReplicationConfig: s.parent.policy.ReplicationConfig,
 	}

replication/logic/replication_logic_policy.go

@@ -1,6 +1,9 @@
 package logic
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/go-playground/validator"
 	"github.com/pkg/errors"
 
@@ -8,16 +11,73 @@ import (
 	"github.com/zrepl/zrepl/replication/logic/pdu"
 )
 
+//go:generate enumer -type=InitialReplicationAutoResolution -trimprefix=InitialReplicationAutoResolution
+type InitialReplicationAutoResolution uint32
+
+const (
+	InitialReplicationAutoResolutionMostRecent InitialReplicationAutoResolution = 1 << iota
+	InitialReplicationAutoResolutionAll
+	InitialReplicationAutoResolutionFail
+)
+
+var initialReplicationAutoResolutionConfigMap = map[InitialReplicationAutoResolution]string{
+	InitialReplicationAutoResolutionMostRecent: "most_recent",
+	InitialReplicationAutoResolutionAll:        "all",
+	InitialReplicationAutoResolutionFail:       "fail",
+}
+
+func InitialReplicationAutoResolutionFromConfig(in string) (InitialReplicationAutoResolution, error) {
+	for v, s := range initialReplicationAutoResolutionConfigMap {
+		if s == in {
+			return v, nil
+		}
+	}
+	l := make([]string, 0, len(initialReplicationAutoResolutionConfigMap))
+	for _, v := range InitialReplicationAutoResolutionValues() {
+		l = append(l, initialReplicationAutoResolutionConfigMap[v])
+	}
+	return 0, fmt.Errorf("invalid value %q, must be one of %s", in, strings.Join(l, ", "))
+}
+
+type ConflictResolution struct {
+	InitialReplication InitialReplicationAutoResolution
+}
+
+func (c *ConflictResolution) Validate() error {
+	if !c.InitialReplication.IsAInitialReplicationAutoResolution() {
+		return errors.Errorf("must be one of %s", InitialReplicationAutoResolutionValues())
+	}
+	return nil
+}
+
+func ConflictResolutionFromConfig(in *config.ConflictResolution) (*ConflictResolution, error) {
+
+	initialReplication, err := InitialReplicationAutoResolutionFromConfig(in.InitialReplication)
+	if err != nil {
+		return nil, errors.Errorf("field `initial_replication` is invalid: %q is not one of %v", in.InitialReplication, InitialReplicationAutoResolutionValues())
+	}
+
+	return &ConflictResolution{
+		InitialReplication: initialReplication,
+	}, nil
+}
+
 type PlannerPolicy struct {
-	EncryptedSend             tri // all sends must be encrypted (send -w, and encryption!=off)
-	ReplicationConfig         *pdu.ReplicationConfig
-	SizeEstimationConcurrency int `validate:"gte=1"`
+	ConflictResolution        *ConflictResolution    `validate:"ne=nil"`
+	ReplicationConfig         *pdu.ReplicationConfig `validate:"ne=nil"`
+	SizeEstimationConcurrency int                    `validate:"gte=1"`
 }
 
 var validate = validator.New()
 
 func (p PlannerPolicy) Validate() error {
-	return validate.Struct(p)
+	if err := validate.Struct(p); err != nil {
+		return err
+	}
+	if err := p.ConflictResolution.Validate(); err != nil {
+		return err
+	}
+	return nil
 }
 
 func ReplicationConfigFromConfig(in *config.Replication) (*pdu.ReplicationConfig, error) {

replication/logic/replication_logic_tri.go

@@ -1,46 +0,0 @@
-package logic
-
-import (
-	"fmt"
-
-	"github.com/zrepl/zrepl/replication/logic/pdu"
-)
-
-type tri int
-
-const (
-	DontCare = 0x0
-	False    = 0x1
-	True     = 0x2
-)
-
-func (t tri) String() string {
-	switch t {
-	case DontCare:
-		return "dontcare"
-	case False:
-		return "false"
-	case True:
-		return "true"
-	}
-	panic(fmt.Sprintf("unknown variant %v", int(t)))
-}
-
-func (t tri) ToPDU() pdu.Tri {
-	switch t {
-	case DontCare:
-		return pdu.Tri_DontCare
-	case False:
-		return pdu.Tri_False
-	case True:
-		return pdu.Tri_True
-	}
-	panic(fmt.Sprintf("unknown variant %v", int(t)))
-}
-
-func TriFromBool(b bool) tri {
-	if b {
-		return True
-	}
-	return False
-}

replication/report/replication_report.go

@@ -97,18 +97,9 @@ type StepReport struct {
 	Info *StepInfo
 }
 
-type EncryptedEnum string
-
-const (
-	EncryptedTrue            EncryptedEnum = "yes"
-	EncryptedFalse           EncryptedEnum = "no"
-	EncryptedSenderDependent EncryptedEnum = "sender-dependent"
-)
-
 type StepInfo struct {
 	From, To        string
 	Resumed         bool
-	Encrypted       EncryptedEnum
 	BytesExpected   uint64
 	BytesReplicated uint64
 }

rpc/dataconn/dataconn_debug.go

@@ -14,7 +14,7 @@ func init() {
 	}
 }
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc/dataconn: %s\n", fmt.Sprintf(format, args...))

rpc/dataconn/heartbeatconn/heartbeatconn.go

@@ -24,6 +24,9 @@ func (e HeartbeatTimeout) Error() string {
 	return "heartbeat timeout"
 }
 
+// This function is deprecated in net.Error and since this
+// function is not involved in .Accept() code path, nothing
+// really needs this method to be here.
 func (e HeartbeatTimeout) Temporary() bool { return true }
 
 func (e HeartbeatTimeout) Timeout() bool { return true }

rpc/dataconn/heartbeatconn/heartbeatconn_debug.go

@@ -13,7 +13,7 @@ func init() {
 	}
 }
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc/dataconn/heartbeatconn: %s\n", fmt.Sprintf(format, args...))

rpc/dataconn/heartbeatconn/integration_test_variablereceiverate/heartbeatconn_integration_variablereceiverate.go

@@ -6,12 +6,12 @@
 // In commit 082335df5d85e1b0b9faa35ff182c71886142d3e and earlier, heartbeatconn would fail
 // this benchmark with a writev I/O timeout (here the ss(8) output at the time of failure)
 //
-//  ESTAB        33369    0                                        127.0.0.1:12345                                                127.0.0.1:57282                    users:(("heartbeatconn_i",pid=25953,fd=5))
-//	 cubic wscale:7,7 rto:203 rtt:2.992/5.849 ato:162 mss:32768 pmtu:65535 rcvmss:32741 advmss:65483 cwnd:10 bytes_sent:48 bytes_acked:48 bytes_received:195401 segs_out:44 segs_in:57 data_segs_out:6 data_segs_in:34 send 876.1Mbps lastsnd:125 lastrcv:9390 lastack:125 pacing_rate 1752.0Mbps delivery_rate 6393.8Mbps delivered:7 app_limited busy:42ms rcv_rtt:1 rcv_space:65483 rcv_ssthresh:65483 minrtt:0.029
-//	 --
-//	 ESTAB        0        3956805                                  127.0.0.1:57282                                                127.0.0.1:12345                    users:(("heartbeatconn_i",pid=26100,fd=3))
-//		  cubic wscale:7,7 rto:211 backoff:5 rtt:10.38/16.937 ato:40 mss:32768 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_sent:195401 bytes_acked:195402 bytes_received:48 segs_out:57 segs_in:45 data_segs_out:34 data_segs_in:6 send 252.5Mbps lastsnd:9390 lastrcv:125 lastack:125 pacing_rate 505.1Mbps delivery_rate 1971.0Mbps delivered:35 busy:30127ms rwnd_limited:30086ms(99.9%) rcv_space:65495 rcv_ssthresh:65495 notsent:3956805 minrtt:0.007
-//	 panic: writev tcp 127.0.0.1:57282->127.0.0.1:12345: i/o timeout
+//	 ESTAB        33369    0                                        127.0.0.1:12345                                                127.0.0.1:57282                    users:(("heartbeatconn_i",pid=25953,fd=5))
+//		 cubic wscale:7,7 rto:203 rtt:2.992/5.849 ato:162 mss:32768 pmtu:65535 rcvmss:32741 advmss:65483 cwnd:10 bytes_sent:48 bytes_acked:48 bytes_received:195401 segs_out:44 segs_in:57 data_segs_out:6 data_segs_in:34 send 876.1Mbps lastsnd:125 lastrcv:9390 lastack:125 pacing_rate 1752.0Mbps delivery_rate 6393.8Mbps delivered:7 app_limited busy:42ms rcv_rtt:1 rcv_space:65483 rcv_ssthresh:65483 minrtt:0.029
+//		 --
+//		 ESTAB        0        3956805                                  127.0.0.1:57282                                                127.0.0.1:12345                    users:(("heartbeatconn_i",pid=26100,fd=3))
+//			  cubic wscale:7,7 rto:211 backoff:5 rtt:10.38/16.937 ato:40 mss:32768 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_sent:195401 bytes_acked:195402 bytes_received:48 segs_out:57 segs_in:45 data_segs_out:34 data_segs_in:6 send 252.5Mbps lastsnd:9390 lastrcv:125 lastack:125 pacing_rate 505.1Mbps delivery_rate 1971.0Mbps delivered:35 busy:30127ms rwnd_limited:30086ms(99.9%) rcv_space:65495 rcv_ssthresh:65495 notsent:3956805 minrtt:0.007
+//		 panic: writev tcp 127.0.0.1:57282->127.0.0.1:12345: i/o timeout
 //
 // The assumed reason for those writev timeouts is the following:
 // - Sporadic server stalls (sever data handling, usually I/O) cause TCP exponential backoff on the client for client->server
@@ -22,27 +22,23 @@
 // The fix contained in the commit this message was committed with resets the deadline whenever
 // a heartbeat is received from the server.
 //
-//
 // How to run this integration test:
 //
+//	Terminal 1:
+//	   $ ZREPL_RPC_DATACONN_HEARTBEATCONN_DEBUG=1 go run heartbeatconn_integration_variablereceiverate.go  -mode server -addr 127.0.0.1:12345
+//	   rpc/dataconn/heartbeatconn: send heartbeat
+//	   rpc/dataconn/heartbeatconn: send heartbeat
+//	   ...
 //
-//  Terminal 1:
-//     $ ZREPL_RPC_DATACONN_HEARTBEATCONN_DEBUG=1 go run heartbeatconn_integration_variablereceiverate.go  -mode server -addr 127.0.0.1:12345
-//     rpc/dataconn/heartbeatconn: send heartbeat
-//     rpc/dataconn/heartbeatconn: send heartbeat
-//     ...
-//
-//  Terminal 2:
-//     $ ZREPL_RPC_DATACONN_HEARTBEATCONN_DEBUG=1 go run heartbeatconn_integration_variablereceiverate.go  -mode  client -addr 127.0.0.1:12345
-//     rpc/dataconn/heartbeatconn: received heartbeat, resetting write timeout
-//     rpc/dataconn/heartbeatconn: renew frameconn write timeout returned errT=<nil> err=%!s(<nil>)
-//     rpc/dataconn/heartbeatconn: send heartbeat
-//     rpc/dataconn/heartbeatconn: received heartbeat, resetting write timeout
-//     rpc/dataconn/heartbeatconn: renew frameconn write timeout returned errT=<nil> err=%!s(<nil>)
-//     rpc/dataconn/heartbeatconn: received heartbeat, resetting write timeout
-//     ...
-//
-//  You should observe
+//	Terminal 2:
+//	   $ ZREPL_RPC_DATACONN_HEARTBEATCONN_DEBUG=1 go run heartbeatconn_integration_variablereceiverate.go  -mode  client -addr 127.0.0.1:12345
+//	   rpc/dataconn/heartbeatconn: received heartbeat, resetting write timeout
+//	   rpc/dataconn/heartbeatconn: renew frameconn write timeout returned errT=<nil> err=%!s(<nil>)
+//	   rpc/dataconn/heartbeatconn: send heartbeat
+//	   rpc/dataconn/heartbeatconn: received heartbeat, resetting write timeout
+//	   rpc/dataconn/heartbeatconn: renew frameconn write timeout returned errT=<nil> err=%!s(<nil>)
+//	   rpc/dataconn/heartbeatconn: received heartbeat, resetting write timeout
+//	   ...
 package main
 
 import (

rpc/dataconn/microbenchmark/microbenchmark.go

@@ -2,15 +2,13 @@
 //
 // With stdin / stdout on client and server, simulating zfs send|recv piping
 //
-//   ./microbenchmark -appmode server  | pv -r > /dev/null
-//   ./microbenchmark -appmode client -direction recv < /dev/zero
-//
+//	./microbenchmark -appmode server  | pv -r > /dev/null
+//	./microbenchmark -appmode client -direction recv < /dev/zero
 //
 // Without the overhead of pipes (just protocol performance, mostly useful with perf bc no bw measurement)
 //
-//   ./microbenchmark -appmode client -direction recv -devnoopWriter -devnoopReader
-//   ./microbenchmark -appmode server -devnoopReader -devnoopWriter
-//
+//	./microbenchmark -appmode client -direction recv -devnoopWriter -devnoopReader
+//	./microbenchmark -appmode server -devnoopReader -devnoopWriter
 package main
 
 import (

rpc/dataconn/stream/stream.go

@@ -29,7 +29,7 @@ func WithLogger(ctx context.Context, log Logger) context.Context {
 	return context.WithValue(ctx, contextKeyLogger, log)
 }
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func getLog(ctx context.Context) Logger {
 	log, ok := ctx.Value(contextKeyLogger).(Logger)
 	if !ok {
@@ -181,23 +181,19 @@ func (e *ReadStreamError) Error() string {
 
 var _ net.Error = &ReadStreamError{}
 
-func (e ReadStreamError) netErr() net.Error {
-	if netErr, ok := e.Err.(net.Error); ok {
-		return netErr
-	}
-	return nil
-}
-
 func (e ReadStreamError) Timeout() bool {
-	if netErr := e.netErr(); netErr != nil {
+	if netErr, ok := e.Err.(net.Error); ok {
 		return netErr.Timeout()
 	}
 	return false
 }
 
+// This function is deprecated in net.Error and since this
+// function is not involved in .Accept() code path, nothing
+// really needs this method to be here.
 func (e ReadStreamError) Temporary() bool {
-	if netErr := e.netErr(); netErr != nil {
-		return netErr.Temporary()
+	if te, ok := e.Err.(interface{ Temporary() bool }); ok {
+		return te.Temporary()
 	}
 	return false
 }

rpc/dataconn/stream/stream_conn.go

@@ -232,7 +232,12 @@ var _ net.Error = (*closeStateErrConnectionClosed)(nil)
 func (e *closeStateErrConnectionClosed) Error() string {
 	return "connection closed"
 }
-func (e *closeStateErrConnectionClosed) Timeout() bool   { return false }
+
+func (e *closeStateErrConnectionClosed) Timeout() bool { return false }
+
+// This function is deprecated in net.Error and since this
+// function is not involved in .Accept() code path, nothing
+// really needs this method to be here.
 func (e *closeStateErrConnectionClosed) Temporary() bool { return false }
 
 func (s *closeState) CloseEntry() error {

rpc/dataconn/stream/stream_debug.go

@@ -13,7 +13,7 @@ func init() {
 	}
 }
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc/dataconn/stream: %s\n", fmt.Sprintf(format, args...))

rpc/dataconn/timeoutconn/internal/wireevaluator/wireevaluator.go

@@ -67,7 +67,7 @@ func main() {
 	case "connect":
 		tc, err := getTestCase(args.testCase)
 		noerror(err)
-		connecter, err := transportconfig.ConnecterFromConfig(global, conf.Connect)
+		connecter, err := transportconfig.ConnecterFromConfig(global, conf.Connect, config.ParseFlagsNone)
 		noerror(err)
 		wire, err := connecter.Connect(ctx)
 		noerror(err)
@@ -75,7 +75,7 @@ func main() {
 	case "serve":
 		tc, err := getTestCase(args.testCase)
 		noerror(err)
-		lf, err := transportconfig.ListenerFactoryFromConfig(global, conf.Serve)
+		lf, err := transportconfig.ListenerFactoryFromConfig(global, conf.Serve, config.ParseFlagsNone)
 		noerror(err)
 		l, err := lf()
 		noerror(err)

rpc/grpcclientidentity/authlistener_grpc_adaptor.go

@@ -118,7 +118,11 @@ func NewInterceptors(logger Logger, clientIdentityKey interface{}, interceptor I
 		if !ok {
 			panic("peer.FromContext expected to return a peer in grpc.UnaryServerInterceptor")
 		}
-		logger.WithField("peer_addr", p.Addr.String()).Debug("peer addr")
+		peerAddr := ""
+		if p.Addr != nil { // https://github.com/zrepl/zrepl/issues/598
+			peerAddr = p.Addr.String()
+		}
+		logger.WithField("peer_addr", peerAddr).Debug("peer addr")
 		a, ok := p.AuthInfo.(*authConnAuthType)
 		if !ok {
 			panic(fmt.Sprintf("NewInterceptors must be used in combination with grpc.NewTransportCredentials, but got auth type %T", p.AuthInfo))

rpc/grpcclientidentity/example/pdu/grpcauth.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.12.4
+// 	protoc        v3.14.0
 // source: grpcauth.proto
 
 package pdu

rpc/netadaptor/authlistener_netlistener_adaptor.go

@@ -1,25 +1,5 @@
 // Package netadaptor implements an adaptor from
 // transport.AuthenticatedListener to net.Listener.
-//
-// In contrast to transport.AuthenticatedListener,
-// net.Listener is commonly expected (e.g. by net/http.Server.Serve),
-// to return errors that fulfill the Temporary interface:
-//   interface Temporary { Temporary() bool }
-// Common behavior of packages consuming net.Listener is to return
-// from the serve-loop if an error returned by Accept is not Temporary,
-// i.e., does not implement the interface or is !net.Error.Temporary().
-//
-// The zrepl transport infrastructure was written with the
-// idea that Accept() may return any kind of error, and the consumer
-// would just log the error and continue calling Accept().
-// We have to adapt these listeners' behavior to the expectations
-// of net/http.Server.
-//
-// Hence, Listener does not return an error at all but blocks the
-// caller of Accept() until we get a (successfully authenticated)
-// connection without errors from the transport.
-// Accept errors returned from the transport are logged as errors
-// to the logger passed on initialization.
 package netadaptor
 
 import (

rpc/rpc_client.go

@@ -188,8 +188,8 @@ func (c *Client) WaitForConnectivity(ctx context.Context) error {
 			data, dataErr := c.dataClient.ReqPing(ctx, &req)
 			// dataClient uses transport.Connecter, which doesn't expose WaitForReady(true)
 			// => we need to mask dial timeouts
-			if err, ok := dataErr.(interface{ Temporary() bool }); ok && err.Temporary() {
-				// Rate-limit pings here in case Temporary() is a mis-classification
+			if err, ok := dataErr.(interface{ Timeout() bool }); ok && err.Timeout() {
+				// Rate-limit pings here in case Timeout() == true is a mis-classification
 				// or returns immediately (this is a tight loop in that case)
 				// TODO keep this in lockstep with controlClient
 				// 		=> don't use FailFast for control, but check that both control and data worked

rpc/rpc_debug.go

@@ -14,7 +14,7 @@ func init() {
 	}
 }
 
-//nolint[:deadcode,unused]
+//nolint:deadcode,unused
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc: %s\n", fmt.Sprintf(format, args...))

rpc/rpc_doc.go

@@ -3,7 +3,7 @@
 // The zrepl documentation refers to the client as the
 // `active side` and to the server as the `passive side`.
 //
-// Design Considerations
+// # Design Considerations
 //
 // zrepl has non-standard requirements to remote procedure calls (RPC):
 // whereas the coordination of replication (the planning phase) mostly
@@ -35,7 +35,7 @@
 //
 // Hence, this package attempts to combine the best of both worlds:
 //
-// GRPC for Coordination and Dataconn for Bulk Data Transfer
+// # GRPC for Coordination and Dataconn for Bulk Data Transfer
 //
 // This package's Client uses its transport.Connecter to maintain
 // separate control and data connections to the Server.
@@ -47,68 +47,66 @@
 // The following ASCII diagram gives an overview of how the individual
 // building blocks are glued together:
 //
-//                    +------------+
-//                    | rpc.Client |
-//                    +------------+
-//                      |         |
-//             +--------+         +------------+
-//             |                               |
-//   +---------v-----------+          +--------v------+
-//   |pdu.ReplicationClient|          |dataconn.Client|
-//   +---------------------+          +--------v------+
-//             | label:            label:      |
-//             | zrepl_control      zrepl_data |
-//             +--------+         +------------+
-//                      |         |
-//                   +--v---------v---+
-//                   |  transportmux  |
-//                   +-------+--------+
-//                           | uses
-//                   +-------v--------+
-//                   |versionhandshake|
-//                   +-------+--------+
-//                           | uses
-//                    +------v------+
-//                    |  transport  |
-//                    +------+------+
-//                           |
-//                        NETWORK
-//                           |
-//                    +------+------+
-//                    |  transport  |
-//                    +------^------+
-//                           | uses
-//                   +-------+--------+
-//                   |versionhandshake|
-//                   +-------^--------+
-//                           | uses
-//                   +-------+--------+
-//                   |  transportmux  |
-//                   +--^--------^----+
-//                      |        |
-//             +--------+        --------------+       ---
-//             |                               |        |
-//             | label:            label:      |        |
-//             | zrepl_control      zrepl_data |        |
-//       +-----+----+              +-----------+---+    |
-//       |netadaptor|              |dataconn.Server|    | rpc.Server
-//       |     +    |              +------+--------+    |
-//       |grpcclient|                     |             |
-//       |identity  |                     |             |
-//       +-----+----+                     |             |
-//             |                          |             |
-//   +---------v-----------+              |             |
-//   |pdu.ReplicationServer|              |             |
-//   +---------+-----------+              |             |
-//             |                          |            ---
-//             +----------+  +------------+
-//                        |  |
-//                    +---v--v-----+
-//                    |  Handler   |
-//                    +------------+
-//           (usually endpoint.{Sender,Receiver})
-//
-//
+//	                 +------------+
+//	                 | rpc.Client |
+//	                 +------------+
+//	                   |         |
+//	          +--------+         +------------+
+//	          |                               |
+//	+---------v-----------+          +--------v------+
+//	|pdu.ReplicationClient|          |dataconn.Client|
+//	+---------------------+          +--------v------+
+//	          | label:            label:      |
+//	          | zrepl_control      zrepl_data |
+//	          +--------+         +------------+
+//	                   |         |
+//	                +--v---------v---+
+//	                |  transportmux  |
+//	                +-------+--------+
+//	                        | uses
+//	                +-------v--------+
+//	                |versionhandshake|
+//	                +-------+--------+
+//	                        | uses
+//	                 +------v------+
+//	                 |  transport  |
+//	                 +------+------+
+//	                        |
+//	                     NETWORK
+//	                        |
+//	                 +------+------+
+//	                 |  transport  |
+//	                 +------^------+
+//	                        | uses
+//	                +-------+--------+
+//	                |versionhandshake|
+//	                +-------^--------+
+//	                        | uses
+//	                +-------+--------+
+//	                |  transportmux  |
+//	                +--^--------^----+
+//	                   |        |
+//	          +--------+        --------------+       ---
+//	          |                               |        |
+//	          | label:            label:      |        |
+//	          | zrepl_control      zrepl_data |        |
+//	    +-----+----+              +-----------+---+    |
+//	    |netadaptor|              |dataconn.Server|    | rpc.Server
+//	    |     +    |              +------+--------+    |
+//	    |grpcclient|                     |             |
+//	    |identity  |                     |             |
+//	    +-----+----+                     |             |
+//	          |                          |             |
+//	+---------v-----------+              |             |
+//	|pdu.ReplicationServer|              |             |
+//	+---------+-----------+              |             |
+//	          |                          |            ---
+//	          +----------+  +------------+
+//	                     |  |
+//	                 +---v--v-----+
+//	                 |  Handler   |
+//	                 +------------+
+//	        (usually endpoint.{Sender,Receiver})
 package rpc
 
 // edit trick for the ASCII art above:

rpc/rpc_logging.go

@@ -9,7 +9,7 @@ import (
 
 type Logger = logger.Logger
 
-/// All fields must be non-nil
+// All fields must be non-nil
 type Loggers struct {
 	General Logger
 	Control Logger

rpc/versionhandshake/versionhandshake.go

@@ -33,8 +33,47 @@ var _ net.Error = &HandshakeError{}
 
 func (e HandshakeError) Error() string { return e.msg }
 
-// Like with net.OpErr (Go issue 6163), a client failing to handshake
-// should be a temporary Accept error toward the Listener .
+// When a net.Listener.Accept() returns an error, the server must
+// decide whether to retry calling Accept() or not.
+// On some platforms (e.g., Linux), Accept() can return errors
+// related to the specific protocol connection that was supposed
+// to be returned as asocket FD. Obviously, we want to ignore,
+// maybe log, those errors and retry Accept() immediately to
+// serve other connections.
+// But there are also conditions where we get Accept() errors because
+// the process has run out of file descriptors. In that case, retrying
+// won't help. We need to close some file descriptor to make progress.
+// Note that there could be lots of open file descriptors because we
+// have accepted, and not yet closed, lots of connections in the past.
+// And then, of course there can be errors where we just want
+// to return, e.g., if there's a programming error and we're getting
+// an EBADFD or whatever.
+//
+// So, the serve loops in net/http.Server.Serve() or gRPC's server.Serve()
+// must inspect the error and decide what to do.
+// The vehicle for this is the
+//
+//	interface { Temporary() bool }
+//
+// Behavior in both of the aforementioned Serve() loops:
+//
+//   - if the error doesn't implement the interface, stop serving and return
+//   - `Temporary() == true`: retry with back-off
+//   - `Temporary() == false`: stop serving and return
+//
+// So, to make this package's HandshakeListener work with these
+// Serve() loops, we return Temporary() == true if the handshake fails.
+// In the aforementioned categories, that's the case of a per-connection
+// protocol error.
+//
+// Note: the net.Error interface has deprecated the Temporary() method
+// in go.dev/issue/45729, but there is no replacement for users of .Accept().
+// Existing users of .Accept() continue to check for the interface.
+// So, we need to continue supporting Temporary() until there's a different
+// mechanism for serve loops to decide whether to retry or not.
+// The following mailing list post proposes to eliminate the retries
+// completely, but it seems like the effort has stalled.
+// https://groups.google.com/g/golang-nuts/c/-JcZzOkyqYI/m/xwaZzjCgAwAJ
 func (e HandshakeError) Temporary() bool {
 	if e.isAcceptError {
 		return true
@@ -152,7 +191,7 @@ func (m *HandshakeMessage) DecodeReader(r io.Reader, maxLen int) error {
 
 func DoHandshakeCurrentVersion(conn net.Conn, deadline time.Time) *HandshakeError {
 	// current protocol version is hardcoded here
-	return DoHandshakeVersion(conn, deadline, 6)
+	return DoHandshakeVersion(conn, deadline, 7)
 }
 
 const HandshakeMessageMaxLen = 16 * 4096

transport/fromconfig/transport_fromconfig.go

@@ -15,7 +15,7 @@ import (
 	"github.com/zrepl/zrepl/transport/tls"
 )
 
-func ListenerFactoryFromConfig(g *config.Global, in config.ServeEnum) (transport.AuthenticatedListenerFactory, error) {
+func ListenerFactoryFromConfig(g *config.Global, in config.ServeEnum, parseFlags config.ParseFlags) (transport.AuthenticatedListenerFactory, error) {
 
 	var (
 		l   transport.AuthenticatedListenerFactory
@@ -25,7 +25,7 @@ func ListenerFactoryFromConfig(g *config.Global, in config.ServeEnum) (transport
 	case *config.TCPServe:
 		l, err = tcp.TCPListenerFactoryFromConfig(g, v)
 	case *config.TLSServe:
-		l, err = tls.TLSListenerFactoryFromConfig(g, v)
+		l, err = tls.TLSListenerFactoryFromConfig(g, v, parseFlags)
 	case *config.StdinserverServer:
 		l, err = ssh.MultiStdinserverListenerFactoryFromConfig(g, v)
 	case *config.LocalServe:
@@ -37,7 +37,7 @@ func ListenerFactoryFromConfig(g *config.Global, in config.ServeEnum) (transport
 	return l, err
 }
 
-func ConnecterFromConfig(g *config.Global, in config.ConnectEnum) (transport.Connecter, error) {
+func ConnecterFromConfig(g *config.Global, in config.ConnectEnum, parseFlags config.ParseFlags) (transport.Connecter, error) {
 	var (
 		connecter transport.Connecter
 		err       error
@@ -48,7 +48,7 @@ func ConnecterFromConfig(g *config.Global, in config.ConnectEnum) (transport.Con
 	case *config.TCPConnect:
 		connecter, err = tcp.TCPConnecterFromConfig(v)
 	case *config.TLSConnect:
-		connecter, err = tls.TLSConnecterFromConfig(v)
+		connecter, err = tls.TLSConnecterFromConfig(v, parseFlags)
 	case *config.LocalConnect:
 		connecter, err = local.LocalConnecterFromConfig(v)
 	default:

transport/tls/connect_tls.go

@@ -18,12 +18,12 @@ type TLSConnecter struct {
 	tlsConfig *tls.Config
 }
 
-func TLSConnecterFromConfig(in *config.TLSConnect) (*TLSConnecter, error) {
+func TLSConnecterFromConfig(in *config.TLSConnect, parseFlags config.ParseFlags) (*TLSConnecter, error) {
 	dialer := net.Dialer{
 		Timeout: in.DialTimeout,
 	}
 
-	if fakeCertificateLoading {
+	if parseFlags&config.ParseFlagsNoCertCheck != 0 {
 		return &TLSConnecter{in.Address, dialer, nil}, nil
 	}