Update vendor

vendor/github.com/google/go-containerregistry/pkg/v1/image.go

@@ -0,0 +1,59 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// 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 v1
+
+import (
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+// Image defines the interface for interacting with an OCI v1 image.
+type Image interface {
+	// Layers returns the ordered collection of filesystem layers that comprise this image.
+	// The order of the list is oldest/base layer first, and most-recent/top layer last.
+	Layers() ([]Layer, error)
+
+	// MediaType of this image's manifest.
+	MediaType() (types.MediaType, error)
+
+	// Size returns the size of the manifest.
+	Size() (int64, error)
+
+	// ConfigName returns the hash of the image's config file, also known as
+	// the Image ID.
+	ConfigName() (Hash, error)
+
+	// ConfigFile returns this image's config file.
+	ConfigFile() (*ConfigFile, error)
+
+	// RawConfigFile returns the serialized bytes of ConfigFile().
+	RawConfigFile() ([]byte, error)
+
+	// Digest returns the sha256 of this image's manifest.
+	Digest() (Hash, error)
+
+	// Manifest returns this image's Manifest object.
+	Manifest() (*Manifest, error)
+
+	// RawManifest returns the serialized bytes of Manifest()
+	RawManifest() ([]byte, error)
+
+	// LayerByDigest returns a Layer for interacting with a particular layer of
+	// the image, looking it up by "digest" (the compressed hash).
+	LayerByDigest(Hash) (Layer, error)
+
+	// LayerByDiffID is an analog to LayerByDigest, looking up by "diff id"
+	// (the uncompressed hash).
+	LayerByDiffID(Hash) (Layer, error)
+}