zfs: seperate implementation pkg from plugin pkg and revendor

Signed-off-by: Siddharth Yadav <sedflix@gmail.com>

cmd/containerd/builtins_zfs_linux.go

@@ -18,4 +18,4 @@
 
 package main
 
-import _ "github.com/containerd/zfs"
+import _ "github.com/containerd/zfs/plugin"

vendor.conf

@@ -99,7 +99,7 @@ github.com/fullsailor/pkcs7                         8306686428a5fe132eac8cb7c484
 gopkg.in/square/go-jose.v2                          v2.3.1
 
 # zfs dependencies
-github.com/containerd/zfs                           9abf673ca6ff9ab8d9bd776a4ceff8f6dc699c3d
+github.com/containerd/zfs                           0a33824f23a2ab8ec84166f47b571ecb793b0354
 github.com/mistifyio/go-zfs                         f784269be439d704d3dfa1906f45dd848fed2beb
 
 # aufs dependencies

vendor/github.com/containerd/zfs/README.md

@@ -7,26 +7,11 @@ ZFS snapshotter plugin for containerd.
 
 This plugin is tested on Linux with Ubuntu.  It should be compatible with FreeBSD.
 
-
-## Compile
-
-To compile containerd with ZFS support, add the import into the `$GOPATH/src/github.com/containerd/containerd/cmd/containerd/builtins_zfs.go` file.
-
-```go
-// +build linux freebsd
-
-package main
-
-import (
-        _ "github.com/containerd/zfs"
-)
-```
-
-Please refer to [`.travis.yml`](.travis.yml) for the latest containerd version known to work with.
-
-
 ## Usage
 
+The plugin is built-in by default since containerd 1.1.
+No need to recompile containerd or execute a proxy snapshotter process.
+
 1. Set up a ZFS filesystem.
 The ZFS filesystem name is arbitrary but the mount point needs to be `/var/lib/containerd/io.containerd.snapshotter.v1.zfs`, when the containerd root is set to `/var/lib/containerd`.
 ```console

vendor/github.com/containerd/zfs/go.mod

@@ -0,0 +1,23 @@
+module github.com/containerd/zfs
+
+go 1.13
+
+require (
+	github.com/Microsoft/hcsshim v0.8.7 // indirect
+	github.com/containerd/containerd v1.3.1-0.20191213020239-082f7e3aed57
+	github.com/containerd/continuity v0.0.0-20191127005431-f65d91d395eb
+	github.com/containerd/ttrpc v0.0.0-20191028202541-4f1b8fe65a5c // indirect
+	github.com/containerd/typeurl v0.0.0-20190911142611-5eb25027c9fd // indirect
+	github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c // indirect
+	github.com/gogo/protobuf v1.3.1 // indirect
+	github.com/google/go-cmp v0.3.1 // indirect
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/mistifyio/go-zfs v2.1.2-0.20190413222219-f784269be439+incompatible
+	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
+	github.com/opencontainers/image-spec v1.0.1 // indirect
+	github.com/opencontainers/runc v1.0.0-rc9 // indirect
+	github.com/pkg/errors v0.8.1
+	go.etcd.io/bbolt v1.3.3 // indirect
+	golang.org/x/sys v0.0.0-20191210023423-ac6580df4449 // indirect
+	google.golang.org/grpc v1.25.1 // indirect
+)

vendor/github.com/containerd/zfs/plugin/plugin.go

@@ -0,0 +1,58 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package plugin
+
+import (
+	"github.com/containerd/containerd/platforms"
+	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/zfs"
+	"github.com/pkg/errors"
+)
+
+
+// Config represents configuration for the zfs plugin
+type Config struct {
+	// Root directory for the plugin
+	RootPath string `toml:"root_path"`
+}
+
+func init() {
+	plugin.Register(&plugin.Registration{
+		Type: plugin.SnapshotPlugin,
+		ID:   "zfs",
+		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
+			ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
+
+			// get config
+			config, ok := ic.Config.(*Config)
+			if !ok {
+				return nil, errors.New("invalid zfs configuration")
+			}
+			// use default ic.Root as root path if config doesn't have a valid root path
+			root := ic.Root
+			if len(config.RootPath) != 0 {
+				root = config.RootPath
+			}
+			ic.Meta.Exports["root"] = root
+			snapshotter, err := zfs.NewSnapshotter(root)
+			if err != nil {
+				return nil, errors.Wrap(plugin.ErrSkipPlugin, err.Error())
+			}
+			return snapshotter, nil
+		},
+	})
+}

vendor/github.com/containerd/zfs/zfs.go

@@ -20,16 +20,13 @@ package zfs
 
 import (
 	"context"
-	"path/filepath"
-
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/mount"
-	"github.com/containerd/containerd/platforms"
-	"github.com/containerd/containerd/plugin"
 	"github.com/containerd/containerd/snapshots"
 	"github.com/containerd/containerd/snapshots/storage"
 	zfs "github.com/mistifyio/go-zfs"
 	"github.com/pkg/errors"
+	"path/filepath"
 )
 
 const (
@@ -39,17 +36,6 @@ const (
 	snapshotSuffix = "snapshot"
 )
 
-func init() {
-	plugin.Register(&plugin.Registration{
-		Type: plugin.SnapshotPlugin,
-		ID:   "zfs",
-		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
-			ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
-			ic.Meta.Exports["root"] = ic.Root
-			return NewSnapshotter(ic.Root)
-		},
-	})
-}
 
 type snapshotter struct {
 	dataset *zfs.Dataset
@@ -66,7 +52,7 @@ func NewSnapshotter(root string) (snapshots.Snapshotter, error) {
 		return nil, err
 	}
 	if m.FSType != "zfs" {
-		return nil, errors.Wrapf(plugin.ErrSkipPlugin, "path %s must be a zfs filesystem to be used with the zfs snapshotter", root)
+		return nil, errors.Errorf("path %s must be a zfs filesystem to be used with the zfs snapshotter", root)
 	}
 	dataset, err := zfs.GetDataset(m.Source)
 	if err != nil {