WIP: fix encrypt-on-recv

fixes https://github.com/zrepl/zrepl/issues/504

.circleci/config.yml

@@ -358,7 +358,7 @@ jobs:
           subcommand: docdep
       - run:
           command: |
-            git config --global user.email "me@cschwarz.com"
+            git config --global user.email "zreplbot@cschwarz.com"
             git config --global user.name "zrepl-github-io-ci"
 
       # https://circleci.com/docs/2.0/add-ssh-key/#adding-multiple-keys-with-blank-hostnames

client/status/viewmodel/render.go

@@ -356,9 +356,17 @@ func renderReplicationReport(t *stringbuilder.B, rep *report.Report, history *by
 		// Progress: [---------------]
 		expected, replicated, containsInvalidSizeEstimates := latest.BytesSum()
 		rate, changeCount := history.Update(replicated)
+		eta := time.Duration(0)
+		if rate > 0 {
+			eta = time.Duration((expected-replicated)/rate) * time.Second
+		}
+
 		t.Write("Progress: ")
 		t.DrawBar(50, replicated, expected, changeCount)
 		t.Write(fmt.Sprintf(" %s / %s @ %s/s", ByteCountBinary(replicated), ByteCountBinary(expected), ByteCountBinary(rate)))
+		if eta != 0 {
+			t.Write(fmt.Sprintf(" (%s remaining)", humanizeDuration(eta)))
+		}
 		t.Newline()
 		if containsInvalidSizeEstimates {
 			t.Write("NOTE: not all steps could be size-estimated, total estimate is likely imprecise!")
@@ -383,6 +391,30 @@ func renderReplicationReport(t *stringbuilder.B, rep *report.Report, history *by
 	}
 }
 
+func humanizeDuration(duration time.Duration) string {
+	days := int64(duration.Hours() / 24)
+	hours := int64(math.Mod(duration.Hours(), 24))
+	minutes := int64(math.Mod(duration.Minutes(), 60))
+	seconds := int64(math.Mod(duration.Seconds(), 60))
+
+	var parts []string
+
+	force := false
+	chunks := []int64{days, hours, minutes, seconds}
+	for i, chunk := range chunks {
+		if force || chunk > 0 {
+			padding := 0
+			if force {
+				padding = 2
+			}
+			parts = append(parts, fmt.Sprintf("%*d%c", padding, chunk, "dhms"[i]))
+			force = true
+		}
+	}
+
+	return strings.Join(parts, " ")
+}
+
 func renderPrunerReport(t *stringbuilder.B, r *pruner.Report, fsfilter FilterFunc) {
 	if r == nil {
 		t.Printf("...\n")

config/samples/quickstart_backup_to_external_disk.yml

@@ -5,7 +5,7 @@
 # quick start section which inlines this example.
 #
 # CUSTOMIZATIONS YOU WILL LIKELY WANT TO APPLY:
-# - adjust the name of the production pool `system` in the `filesystems` filter of jobs `snapjob` and `push_to_derive`
+# - adjust the name of the production pool `system` in the `filesystems` filter of jobs `snapjob` and `push_to_drive`
 # - adjust the name of the backup pool `backuppool` in the `backuppool_sink` job
 # - adjust the occurences of `myhostname` to the name of the system you are backing up (cannot be easily changed once you start replicating)
 # - make sure the `zrepl_` prefix is not being used by any other zfs tools you might have installed (it likely isn't)
@@ -85,4 +85,4 @@ jobs:
   root_fs: "backuppool/zrepl/sink"
   serve:
     type: local
-    listener_name: backuppool_sink
+    listener_name: backuppool_sink

docs/publish.sh

@@ -1,6 +1,5 @@
 #!/bin/bash
-set -eo pipefail
-
+set -euo pipefail
 
 NON_INTERACTIVE=false
 DO_CLONE=false
@@ -13,7 +12,7 @@ while getopts "ca" arg; do
             DO_CLONE=true
             ;;
         *)
-            echo invalid option
+            echo "invalid option '-$arg'"
             exit 1
             ;;
     esac
@@ -27,11 +26,6 @@ checkout_repo_msg() {
     echo "clone ${GHPAGESREPO} to ${PUBLICDIR}:"
 }
 
-exit_msg() {
-    echo "error, exiting..."
-}
-trap exit_msg EXIT
-
 if ! type sphinx-versioning >/dev/null; then
     echo "install sphinx-versioning and come back"
     exit 1
@@ -71,6 +65,9 @@ git reset --hard origin/master
 
 echo "cleaning GitHub pages repo"
 git rm -rf .
+cat > .gitignore <<EOF
+**/.doctrees
+EOF
 
 popd
 
@@ -96,7 +93,13 @@ COMMIT_MSG="sphinx-versioning render from publish.sh - $(date -u) - ${CURRENT_CO
 pushd "$PUBLICDIR"
 
 echo "adding and commiting all changes in GitHub pages repo"
+git add .gitignore
 git add -A
-git commit -m "$COMMIT_MSG"
+if [ "$(git status --porcelain)" != "" ]; then
+    git commit -m "$COMMIT_MSG"
+else
+    echo "nothing to commit"
+fi
+echo "pushing to GitHub pages repo"
 git push origin master
 

zfs/placeholder.go

@@ -90,6 +90,40 @@ func ZFSCreatePlaceholderFilesystem(ctx context.Context, fs *DatasetPath, parent
 		"-o", fmt.Sprintf("%s=%s", PlaceholderPropertyName, placeholderPropertyOn),
 		"-o", "mountpoint=none",
 	}
+
+	// xxx handle encryption not supported
+	props, err := zfsGet(ctx, parent.ToString(), []string{"keystatus"}, SourceAny)
+	if err != nil {
+		return errors.Wrap(err, "cannot determine key status")
+	}
+	keystatus := props.Get("keystatus") // xxx ability to distringuish `-` from ``
+	if keystatus == "" {
+		// parent is unencrypted => placeholder inherits encryption
+	} else if keystatus == "available" {
+		// parent is encrypted but since the key is loaded we can create an encrypted placeholder dataset
+		// without `-o encryption=off`
+	} else if keystatus == "unavailable" {
+		// parent is encrypted but keys are not loaded, either because
+		//  1) it's a send-encrypted dataset, or because
+		//  2) the user forgot to zfs load-key the root_fs or above
+		// In both cases we can't create an encrypted placeholder dataset.
+		// In case 1), we want to create an unencrypted placeholder through `-o encryption=off`.
+		// In case 2), `-o encryption=off` is harmful security-wise because it breaks the encrypt-on-receiver use case (https://github.com/zrepl/zrepl/issues/504)
+		// 			   I.e., all children of the placeholder won't be encrypted because they inherit encryption=off
+		//
+		// => we could attempt to distinguish the cases by being more context sensitive
+		//    (i.e., check whether the encryption root is root_fs or a parent thereof)
+		//    However, that's always going to be imprecise, and a wrong decision there is harmful security-wise.
+		//
+		// => thus the safe choice is to never use `-o encryption=off` by default
+		//    only if we know for sure that the stream is encrypted should we create placeholders with `-o encryption=off`
+		//    => this knowledge can be achieved through one of the following means:
+		//		a) have the sender indicate it to us in the RPC request (it's ok to trust them in this particular case since lying only hurts _their_ data's confidentiality)
+		// 		b) have the user acknowledge it in the receiver config
+	} else {
+		return errors.Errorf("unknown keystatus value %q for dataset %q", keystatus, parent.ToString())
+	}
+
 	if parentEncrypted, err := ZFSGetEncryptionEnabled(ctx, parent.ToString()); err != nil {
 		return errors.Wrap(err, "cannot determine encryption support")
 	} else if parentEncrypted {