implement local replication using new local transport

The new local transport uses socketpair() and a switchboard based on
client identities.
The special local job type is gone, which is good since it does not fit
into the 'Active/Passive side ' + 'mode' concept used to implement the
duality of push/sink | pull/source.

config/config.go

@@ -59,16 +59,6 @@ type SourceJob struct {
 	Filesystems FilesystemsFilter `yaml:"filesystems"`
 }
 
-type LocalJob struct {
-	Type         string                `yaml:"type"`
-	Name         string                `yaml:"name"`
-	Filesystems FilesystemsFilter `yaml:"filesystems"`
-	RootDataset string          `yaml:"root_dataset"`
-	Snapshotting Snapshotting          `yaml:"snapshotting"`
-	Pruning      PruningSenderReceiver `yaml:"pruning"`
-	Debug        JobDebugSettings      `yaml:"debug,optional"`
-}
-
 type FilesystemsFilter map[string]bool
 
 type Snapshotting struct {
@@ -171,6 +161,11 @@ type SSHStdinserverConnect struct {
 	DialTimeout          time.Duration `yaml:"dial_timeout,positive,default=10s"`
 }
 
+type LocalConnect struct {
+	ConnectCommon `yaml:",inline"`
+	ClientIdentity string `yaml:"client_identity"`
+}
+
 type ServeEnum struct {
 	Ret interface{}
 }
@@ -201,6 +196,10 @@ type StdinserverServer struct {
 	ClientIdentities []string `yaml:"client_identities"`
 }
 
+type LocalServe struct {
+	ServeCommon `yaml:",inline"`
+}
+
 type PruningEnum struct {
 	Ret interface{}
 }
@@ -311,7 +310,6 @@ func (t *JobEnum) UnmarshalYAML(u func(interface{}, bool) error) (err error) {
 		"sink":   &SinkJob{},
 		"pull":   &PullJob{},
 		"source": &SourceJob{},
-		"local":  &LocalJob{},
 	})
 	return
 }
@@ -321,6 +319,7 @@ func (t *ConnectEnum) UnmarshalYAML(u func(interface{}, bool) error) (err error)
 		"tcp":             &TCPConnect{},
 		"tls":             &TLSConnect{},
 		"ssh+stdinserver": &SSHStdinserverConnect{},
+		"local": 		   &LocalConnect{},
 	})
 	return
 }
@@ -330,6 +329,7 @@ func (t *ServeEnum) UnmarshalYAML(u func(interface{}, bool) error) (err error) {
 		"tcp":         &TCPServe{},
 		"tls":         &TLSServe{},
 		"stdinserver": &StdinserverServer{},
+		"local"      : &LocalServe{},
 	})
 	return
 }

config/samples/local.yml

@@ -1,26 +1,28 @@
 
 jobs:
-- name: mirror_local
-  type: local
-  # snapshot the filesystems matched by the left-hand-side of the mapping
-  # every 10m with zrepl_ as prefix
-  filesystems: {
-    "pool1/var/db<": true,
-    "pool1/usr/home<": true,
-    "pool1/usr/home/paranoid": false, #don't backup paranoid user
-    "pool1/poudriere/ports<": false #don't backup the ports trees
-  }
-  # TODO FIXME enforce that the tree under root_dataset and the trees allowed (true) by filesystems are non-overlapping
-  root_dataset: "pool2/backups/pool1"
+  - type: sink
+    name: "local_sink"
+    root_dataset: "storage/zrepl/sink"
+    serve:
+      type: local
 
-  snapshotting:
-    snapshot_prefix: zrepl_
-    interval: 10m
-
-  pruning:
-    keep_sender:
-    - type: not_replicated
-    keep_receiver:
-    - type: grid
-      grid: 1x1h(keep=all) | 24x1h | 35x1d | 6x30d
-      keep_bookmarks: all
+  - type: push
+    name: "backup_system"
+    connect:
+      type: local
+      client_identity: local_backup
+    filesystems: {
+      "system<": true,
+    }
+    snapshotting:
+      snapshot_prefix: zrepl_
+      interval: 10m
+    pruning:
+      keep_sender:
+      - type: not_replicated
+      - type: last_n
+        count: 10
+      keep_receiver:
+      - type: grid
+        grid: 1x1h(keep=all) | 24x1h | 35x1d | 6x30d
+        keep_bookmarks: all