aufs: seperate implementation pkg from plugin pkg and revendor

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

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

@@ -1,7 +1,6 @@
 # aufs snapshotter
 
 [![Build Status](https://travis-ci.org/containerd/aufs.svg?branch=master)](https://travis-ci.org/containerd/aufs)
-
 [![codecov](https://codecov.io/gh/containerd/aufs/branch/master/graph/badge.svg)](https://codecov.io/gh/containerd/aufs)
 
 

vendor/github.com/containerd/aufs/aufs.go

@@ -32,25 +32,12 @@ import (
 
 	"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"
 	"github.com/containerd/continuity/fs"
 	"github.com/pkg/errors"
 )
 
-func init() {
-	plugin.Register(&plugin.Registration{
-		Type: plugin.SnapshotPlugin,
-		ID:   "aufs",
-		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
-			ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
-			ic.Meta.Exports["root"] = ic.Root
-			return New(ic.Root)
-		},
-	})
-}
 
 var (
 	dirperm        sync.Once
@@ -65,7 +52,7 @@ type snapshotter struct {
 // New creates a new snapshotter using aufs
 func New(root string) (snapshots.Snapshotter, error) {
 	if err := supported(); err != nil {
-		return nil, errors.Wrap(plugin.ErrSkipPlugin, err.Error())
+		return nil, err
 	}
 	if err := os.MkdirAll(root, 0700); err != nil {
 		return nil, err

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

@@ -0,0 +1,22 @@
+module github.com/containerd/aufs
+
+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/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/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
+	golang.org/x/sys v0.0.0-20191210023423-ac6580df4449
+	google.golang.org/grpc v1.25.1 // indirect
+)

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

@@ -0,0 +1,60 @@
+/*
+   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/aufs"
+	"github.com/containerd/containerd/platforms"
+	"github.com/containerd/containerd/plugin"
+	"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:   "aufs",
+		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 aufs 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 := aufs.New(root)
+			if err != nil {
+				return nil, errors.Wrap(plugin.ErrSkipPlugin, err.Error())
+			}
+			return snapshotter, nil
+		},
+	})
+}