update vendored go-containerregistry

integration/integration_test.go

@@ -275,7 +275,7 @@ func numLayers(image string) (int, error) {
 	if err != nil {
 		return 0, err
 	}
-	img, err := daemon.Image(ref, &daemon.ReadOptions{})
+	img, err := daemon.Image(ref)
 	if err != nil {
 		return 0, err
 	}

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

@@ -30,14 +30,42 @@ import (
 // image accesses an image from a docker daemon
 type image struct {
 	v1.Image
-}
 
-type ReadOptions struct {
-	Buffer bool
+	opener tarball.Opener
+	ref    name.Reference
 }
 
 var _ v1.Image = (*image)(nil)
 
+type imageOpener struct {
+	ref      name.Reference
+	buffered bool
+}
+
+type ImageOption func(*imageOpener) error
+
+func (i *imageOpener) Open() (v1.Image, error) {
+	var opener tarball.Opener
+	var err error
+	if i.buffered {
+		opener, err = bufferedOpener(i.ref)
+	} else {
+		opener, err = unbufferedOpener(i.ref)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	tb, err := tarball.Image(opener, nil)
+	if err != nil {
+		return nil, err
+	}
+	img := &image{
+		Image: tb,
+	}
+	return img, nil
+}
+
 // API interface for testing.
 type ImageSaver interface {
 	ImageSave(context.Context, []string) (io.ReadCloser, error)
@@ -83,25 +111,18 @@ func unbufferedOpener(ref name.Reference) (tarball.Opener, error) {
 	}, nil
 }
 
-// Image exposes an image reference from within the Docker daemon.
-func Image(ref name.Reference, ro *ReadOptions) (v1.Image, error) {
-	var opener tarball.Opener
-	var err error
-	if ro.Buffer {
-		opener, err = bufferedOpener(ref)
-	} else {
-		opener, err = unbufferedOpener(ref)
+// Image provides access to an image reference from the Docker daemon,
+// applying functional options to the underlying imageOpener before
+// resolving the reference into a v1.Image.
+func Image(ref name.Reference, options ...ImageOption) (v1.Image, error) {
+	i := &imageOpener{
+		ref:      ref,
+		buffered: true, // buffer by default
 	}
-	if err != nil {
-		return nil, err
+	for _, option := range options {
+		if err := option(i); err != nil {
+			return nil, err
+		}
 	}
-
-	tb, err := tarball.Image(opener, nil)
-	if err != nil {
-		return nil, err
-	}
-	img := &image{
-		Image: tb,
-	}
-	return img, nil
+	return i.Open()
 }

vendor/github.com/google/go-containerregistry/pkg/v1/daemon/options.go

@@ -0,0 +1,32 @@
+// 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 daemon
+
+func WithBufferedOpener() ImageOption {
+	return func(i *imageOpener) error {
+		return i.setBuffered(true)
+	}
+}
+
+func WithUnbufferedOpener() ImageOption {
+	return func(i *imageOpener) error {
+		return i.setBuffered(false)
+	}
+}
+
+func (i *imageOpener) setBuffered(buffer bool) error {
+	i.buffered = buffer
+	return nil
+}