Updated PR Branch with master

vendor/github.com/google/go-containerregistry/pkg/authn/helper.go

@@ -72,7 +72,7 @@ func (h *helper) Authorization() (string, error) {
 
 	var out bytes.Buffer
 	cmd.Stdout = &out
-	err := h.r.Run(cmd)
+	cmdErr := h.r.Run(cmd)
 
 	// If we see this specific message, it means the domain wasn't found
 	// and we should fall back on anonymous auth.
@@ -81,16 +81,22 @@ func (h *helper) Authorization() (string, error) {
 		return Anonymous.Authorization()
 	}
 
-	if err != nil {
-		return "", err
-	}
-
 	// Any other output should be parsed as JSON and the Username / Secret
 	// fields used for Basic authentication.
 	ho := helperOutput{}
 	if err := json.Unmarshal([]byte(output), &ho); err != nil {
+		if cmdErr != nil {
+			// If we failed to parse output, it won't contain Secret, so returning it
+			// in an error should be fine.
+			return "", fmt.Errorf("invoking %s: %v; output: %s", helperName, cmdErr, output)
+		}
 		return "", err
 	}
+
+	if cmdErr != nil {
+		return "", fmt.Errorf("invoking %s: %v", helperName, cmdErr)
+	}
+
 	b := Basic{Username: ho.Username, Password: ho.Secret}
 	return b.Authorization()
 }

vendor/github.com/google/go-containerregistry/pkg/authn/k8schain/doc.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// package k8schain exposes an implementation of the authn.Keychain interface
+// Package k8schain exposes an implementation of the authn.Keychain interface
 // based on the semantics the Kubelet follows when pulling the images for a
 // Pod in Kubernetes.
 package k8schain

vendor/github.com/google/go-containerregistry/pkg/authn/k8schain/k8schain.go

@@ -17,7 +17,7 @@ package k8schain
 import (
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"

vendor/github.com/google/go-containerregistry/pkg/name/digest.go

@@ -73,14 +73,14 @@ func NewDigest(name string, strict Strictness) (Digest, error) {
 	base := parts[0]
 	digest := parts[1]
 
-	// We don't require a digest, but if we get one check it's valid,
-	// even when not being strict.
-	// If we are being strict, we want to validate the digest regardless in case
-	// it's empty.
-	if digest != "" || strict == StrictValidation {
-		if err := checkDigest(digest); err != nil {
-			return Digest{}, err
-		}
+	// Always check that the digest is valid.
+	if err := checkDigest(digest); err != nil {
+		return Digest{}, err
+	}
+
+	tag, err := NewTag(base, strict)
+	if err == nil {
+		base = tag.Repository.Name()
 	}
 
 	repo, err := NewRepository(base, strict)

vendor/github.com/google/go-containerregistry/pkg/name/registry.go

@@ -15,12 +15,14 @@
 package name
 
 import (
+	"net"
 	"net/url"
 	"regexp"
 	"strings"
 )
 
 const (
+	// DefaultRegistry is Docker Hub, assumed when a hostname is omitted.
 	DefaultRegistry      = "index.docker.io"
 	defaultRegistryAlias = "docker.io"
 )
@@ -63,11 +65,29 @@ func (r Registry) Scope(string) string {
 	return "registry:catalog:*"
 }
 
+func (r Registry) isRFC1918() bool {
+	ipStr := strings.Split(r.Name(), ":")[0]
+	ip := net.ParseIP(ipStr)
+	if ip == nil {
+		return false
+	}
+	for _, cidr := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"} {
+		_, block, _ := net.ParseCIDR(cidr)
+		if block.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
+
 // Scheme returns https scheme for all the endpoints except localhost or when explicitly defined.
 func (r Registry) Scheme() string {
 	if r.insecure {
 		return "http"
 	}
+	if r.isRFC1918() {
+		return "http"
+	}
 	if strings.HasPrefix(r.Name(), "localhost:") {
 		return "http"
 	}

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

@@ -21,27 +21,28 @@ import (
 )
 
 // ConfigFile is the configuration file that holds the metadata describing
-// how to launch a container.  The names of the fields are chosen to reflect
-// the JSON payload of the ConfigFile as defined here: https://git.io/vrAEY
+// how to launch a container. See:
+// https://github.com/opencontainers/image-spec/blob/master/config.md
 type ConfigFile struct {
 	Architecture    string    `json:"architecture"`
-	Container       string    `json:"container"`
-	Created         Time      `json:"created"`
-	DockerVersion   string    `json:"docker_version"`
-	History         []History `json:"history"`
+	Author          string    `json:"author,omitempty"`
+	Container       string    `json:"container,omitempty"`
+	Created         Time      `json:"created,omitempty"`
+	DockerVersion   string    `json:"docker_version,omitempty"`
+	History         []History `json:"history,omitempty"`
 	OS              string    `json:"os"`
 	RootFS          RootFS    `json:"rootfs"`
 	Config          Config    `json:"config"`
-	ContainerConfig Config    `json:"container_config"`
-	OSVersion       string    `json:"osversion"`
+	ContainerConfig Config    `json:"container_config,omitempty"`
+	OSVersion       string    `json:"osversion,omitempty"`
 }
 
 // History is one entry of a list recording how this container image was built.
 type History struct {
-	Author     string `json:"author"`
-	Created    Time   `json:"created"`
-	CreatedBy  string `json:"created_by"`
-	Comment    string `json:"comment"`
+	Author     string `json:"author,omitempty"`
+	Created    Time   `json:"created,omitempty"`
+	CreatedBy  string `json:"created_by,omitempty"`
+	Comment    string `json:"comment,omitempty"`
 	EmptyLayer bool   `json:"empty_layer,omitempty"`
 }
 

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

@@ -20,11 +20,10 @@ import (
 	"io"
 	"io/ioutil"
 
-	"github.com/google/go-containerregistry/pkg/v1/tarball"
-
 	"github.com/docker/docker/client"
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/tarball"
 )
 
 // image accesses an image from a docker daemon
@@ -42,6 +41,7 @@ type imageOpener struct {
 	buffered bool
 }
 
+// ImageOption is a functional option for Image.
 type ImageOption func(*imageOpener) error
 
 func (i *imageOpener) Open() (v1.Image, error) {
@@ -66,7 +66,7 @@ func (i *imageOpener) Open() (v1.Image, error) {
 	return img, nil
 }
 
-// API interface for testing.
+// ImageSaver is an interface for testing.
 type ImageSaver interface {
 	ImageSave(context.Context, []string) (io.ReadCloser, error)
 }

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

@@ -14,12 +14,14 @@
 
 package daemon
 
+// WithBufferedOpener buffers the image.
 func WithBufferedOpener() ImageOption {
 	return func(i *imageOpener) error {
 		return i.setBuffered(true)
 	}
 }
 
+// WithUnbufferedOpener streams the image to avoid buffering.
 func WithUnbufferedOpener() ImageOption {
 	return func(i *imageOpener) error {
 		return i.setBuffered(false)

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

@@ -19,22 +19,21 @@ import (
 	"io"
 	"io/ioutil"
 
-	"github.com/pkg/errors"
-
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/client"
-
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/tarball"
+	"github.com/pkg/errors"
 )
 
-// API interface for testing.
+// ImageLoader is an interface for testing.
 type ImageLoader interface {
 	ImageLoad(context.Context, io.Reader, bool) (types.ImageLoadResponse, error)
+	ImageTag(context.Context, string, string) error
 }
 
-// This is a variable so we can override in tests.
+// GetImageLoader is a variable so we can override in tests.
 var GetImageLoader = func() (ImageLoader, error) {
 	cli, err := client.NewEnvClient()
 	if err != nil {
@@ -44,6 +43,16 @@ var GetImageLoader = func() (ImageLoader, error) {
 	return cli, nil
 }
 
+// Tag adds a tag to an already existent image.
+func Tag(src, dest name.Tag) error {
+	cli, err := GetImageLoader()
+	if err != nil {
+		return err
+	}
+
+	return cli.ImageTag(context.Background(), src.String(), dest.String())
+}
+
 // Write saves the image into the daemon as the given tag.
 func Write(tag name.Tag, img v1.Image) (string, error) {
 	cli, err := GetImageLoader()

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

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package v1 defines structured types for OCI v1 images
+//go:generate deepcopy-gen -O zz_deepcopy_generated --go-header-file $BOILER_PLATE_FILE -i .
 // +k8s:deepcopy-gen=package
 
-//go:generate deepcopy-gen -O zz_deepcopy_generated --go-header-file $BOILER_PLATE_FILE -i .
+// Package v1 defines structured types for OCI v1 images
 package v1

vendor/github.com/google/go-containerregistry/pkg/v1/empty/index.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 empty
+
+import (
+	"encoding/json"
+	"errors"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+// Index is a singleton empty index, think: FROM scratch.
+var Index = emptyIndex{}
+
+type emptyIndex struct{}
+
+func (i emptyIndex) MediaType() (types.MediaType, error) {
+	return types.OCIImageIndex, nil
+}
+
+func (i emptyIndex) Digest() (v1.Hash, error) {
+	return partial.Digest(i)
+}
+
+func (i emptyIndex) IndexManifest() (*v1.IndexManifest, error) {
+	return &v1.IndexManifest{
+		SchemaVersion: 2,
+	}, nil
+}
+
+func (i emptyIndex) RawManifest() ([]byte, error) {
+	im, err := i.IndexManifest()
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(im)
+}
+
+func (i emptyIndex) Image(v1.Hash) (v1.Image, error) {
+	return nil, errors.New("empty index")
+}
+
+func (i emptyIndex) ImageIndex(v1.Hash) (v1.ImageIndex, error) {
+	return nil, errors.New("empty index")
+}

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

@@ -49,7 +49,7 @@ func NewHash(s string) (Hash, error) {
 }
 
 // MarshalJSON implements json.Marshaler
-func (h *Hash) MarshalJSON() ([]byte, error) {
+func (h Hash) MarshalJSON() ([]byte, error) {
 	return json.Marshal(h.String())
 }
 

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

@@ -24,9 +24,6 @@ type Image interface {
 	// The order of the list is oldest/base layer first, and most-recent/top layer last.
 	Layers() ([]Layer, error)
 
-	// BlobSet returns an unordered collection of all the blobs in the image.
-	BlobSet() (map[Hash]struct{}, error)
-
 	// MediaType of this image's manifest.
 	MediaType() (types.MediaType, error)
 

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

@@ -18,6 +18,7 @@ import (
 	"github.com/google/go-containerregistry/pkg/v1/types"
 )
 
+// ImageIndex defines the interface for interacting with an OCI image index.
 type ImageIndex interface {
 	// MediaType of this image's manifest.
 	MediaType() (types.MediaType, error)
@@ -28,6 +29,12 @@ type ImageIndex interface {
 	// IndexManifest returns this image index's manifest object.
 	IndexManifest() (*IndexManifest, error)
 
-	// RawIndexManifest returns the serialized bytes of IndexManifest().
-	RawIndexManifest() ([]byte, error)
+	// RawManifest returns the serialized bytes of IndexManifest().
+	RawManifest() ([]byte, error)
+
+	// Image returns a v1.Image that this ImageIndex references.
+	Image(Hash) (Image, error)
+
+	// ImageIndex returns a v1.ImageIndex that this ImageIndex references.
+	ImageIndex(Hash) (ImageIndex, error)
 }

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

@@ -23,7 +23,7 @@ import (
 
 // Manifest represents the OCI image manifest in a structured way.
 type Manifest struct {
-	SchemaVersion int64             `json:"schemaVersion"`
+	SchemaVersion int64             `json:"schemaVersion,omitempty"`
 	MediaType     types.MediaType   `json:"mediaType"`
 	Config        Descriptor        `json:"config"`
 	Layers        []Descriptor      `json:"layers"`

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

@@ -26,9 +26,10 @@ import (
 	"strings"
 	"time"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/empty"
 	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/stream"
 	"github.com/google/go-containerregistry/pkg/v1/tarball"
 	"github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
@@ -58,77 +59,14 @@ func Append(base v1.Image, adds ...Addendum) (v1.Image, error) {
 	if len(adds) == 0 {
 		return base, nil
 	}
-
 	if err := validate(adds); err != nil {
 		return nil, err
 	}
 
-	m, err := base.Manifest()
-	if err != nil {
-		return nil, err
-	}
-
-	cf, err := base.ConfigFile()
-	if err != nil {
-		return nil, err
-	}
-
-	image := &image{
-		Image:      base,
-		manifest:   m.DeepCopy(),
-		configFile: cf.DeepCopy(),
-		diffIDMap:  make(map[v1.Hash]v1.Layer),
-		digestMap:  make(map[v1.Hash]v1.Layer),
-	}
-
-	diffIDs := image.configFile.RootFS.DiffIDs
-	history := image.configFile.History
-
-	for _, add := range adds {
-		diffID, err := add.Layer.DiffID()
-		if err != nil {
-			return nil, err
-		}
-		diffIDs = append(diffIDs, diffID)
-		history = append(history, add.History)
-		image.diffIDMap[diffID] = add.Layer
-	}
-
-	manifestLayers := image.manifest.Layers
-
-	for _, add := range adds {
-		d := v1.Descriptor{
-			MediaType: types.DockerLayer,
-		}
-
-		if d.Size, err = add.Layer.Size(); err != nil {
-			return nil, err
-		}
-
-		if d.Digest, err = add.Layer.Digest(); err != nil {
-			return nil, err
-		}
-
-		manifestLayers = append(manifestLayers, d)
-		image.digestMap[d.Digest] = add.Layer
-	}
-
-	image.configFile.RootFS.DiffIDs = diffIDs
-	image.configFile.History = history
-	image.manifest.Layers = manifestLayers
-
-	rcfg, err := image.RawConfigFile()
-	if err != nil {
-		return nil, err
-	}
-	d, sz, err := v1.SHA256(bytes.NewBuffer(rcfg))
-	if err != nil {
-		return nil, err
-	}
-	image.manifest.Config.Digest = d
-	image.manifest.Config.Size = sz
-
-	return image, nil
+	return &image{
+		base: base,
+		adds: adds,
+	}, nil
 }
 
 // Config mutates the provided v1.Image to have the provided v1.Config
@@ -150,22 +88,11 @@ func configFile(base v1.Image, cfg *v1.ConfigFile) (v1.Image, error) {
 	}
 
 	image := &image{
-		Image:      base,
+		base:       base,
 		manifest:   m.DeepCopy(),
 		configFile: cfg,
-		digestMap:  make(map[v1.Hash]v1.Layer),
 	}
 
-	rcfg, err := image.RawConfigFile()
-	if err != nil {
-		return nil, err
-	}
-	d, sz, err := v1.SHA256(bytes.NewBuffer(rcfg))
-	if err != nil {
-		return nil, err
-	}
-	image.manifest.Config.Digest = d
-	image.manifest.Config.Size = sz
 	return image, nil
 }
 
@@ -183,16 +110,118 @@ func CreatedAt(base v1.Image, created v1.Time) (v1.Image, error) {
 }
 
 type image struct {
-	v1.Image
+	base v1.Image
+	adds []Addendum
+
+	computed   bool
 	configFile *v1.ConfigFile
 	manifest   *v1.Manifest
 	diffIDMap  map[v1.Hash]v1.Layer
 	digestMap  map[v1.Hash]v1.Layer
 }
 
+var _ v1.Image = (*image)(nil)
+
+func (i *image) MediaType() (types.MediaType, error) { return i.base.MediaType() }
+
+func (i *image) compute() error {
+	// Don't re-compute if already computed.
+	if i.computed {
+		return nil
+	}
+	var configFile *v1.ConfigFile
+	if i.configFile != nil {
+		configFile = i.configFile
+	} else {
+		cf, err := i.base.ConfigFile()
+		if err != nil {
+			return err
+		}
+		configFile = cf.DeepCopy()
+	}
+	diffIDs := configFile.RootFS.DiffIDs
+	history := configFile.History
+
+	diffIDMap := make(map[v1.Hash]v1.Layer)
+	digestMap := make(map[v1.Hash]v1.Layer)
+
+	for _, add := range i.adds {
+		diffID, err := add.Layer.DiffID()
+		if err != nil {
+			return err
+		}
+		diffIDs = append(diffIDs, diffID)
+		history = append(history, add.History)
+		diffIDMap[diffID] = add.Layer
+	}
+
+	m, err := i.base.Manifest()
+	if err != nil {
+		return err
+	}
+	manifest := m.DeepCopy()
+	manifestLayers := manifest.Layers
+	for _, add := range i.adds {
+		d := v1.Descriptor{
+			MediaType: types.DockerLayer,
+		}
+
+		var err error
+		if d.Size, err = add.Layer.Size(); err != nil {
+			return err
+		}
+
+		if d.Digest, err = add.Layer.Digest(); err != nil {
+			return err
+		}
+
+		manifestLayers = append(manifestLayers, d)
+		digestMap[d.Digest] = add.Layer
+	}
+
+	configFile.RootFS.DiffIDs = diffIDs
+	configFile.History = history
+
+	manifest.Layers = manifestLayers
+
+	rcfg, err := json.Marshal(configFile)
+	if err != nil {
+		return err
+	}
+	d, sz, err := v1.SHA256(bytes.NewBuffer(rcfg))
+	if err != nil {
+		return err
+	}
+	manifest.Config.Digest = d
+	manifest.Config.Size = sz
+
+	i.configFile = configFile
+	i.manifest = manifest
+	i.diffIDMap = diffIDMap
+	i.digestMap = digestMap
+	i.computed = true
+	return nil
+}
+
 // 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.
 func (i *image) Layers() ([]v1.Layer, error) {
+	if err := i.compute(); err == stream.ErrNotComputed {
+		// Image contains a streamable layer which has not yet been
+		// consumed. Just return the layers we have in case the caller
+		// is going to consume the layers.
+		layers, err := i.base.Layers()
+		if err != nil {
+			return nil, err
+		}
+		for _, add := range i.adds {
+			layers = append(layers, add.Layer)
+		}
+		return layers, nil
+	} else if err != nil {
+		return nil, err
+	}
+
 	diffIDs, err := partial.DiffIDs(i)
 	if err != nil {
 		return nil, err
@@ -208,38 +237,51 @@ func (i *image) Layers() ([]v1.Layer, error) {
 	return ls, nil
 }
 
-// BlobSet returns an unordered collection of all the blobs in the image.
-func (i *image) BlobSet() (map[v1.Hash]struct{}, error) {
-	return partial.BlobSet(i)
-}
-
 // ConfigName returns the hash of the image's config file.
 func (i *image) ConfigName() (v1.Hash, error) {
+	if err := i.compute(); err != nil {
+		return v1.Hash{}, err
+	}
 	return partial.ConfigName(i)
 }
 
 // ConfigFile returns this image's config file.
 func (i *image) ConfigFile() (*v1.ConfigFile, error) {
+	if err := i.compute(); err != nil {
+		return nil, err
+	}
 	return i.configFile, nil
 }
 
 // RawConfigFile returns the serialized bytes of ConfigFile()
 func (i *image) RawConfigFile() ([]byte, error) {
+	if err := i.compute(); err != nil {
+		return nil, err
+	}
 	return json.Marshal(i.configFile)
 }
 
 // Digest returns the sha256 of this image's manifest.
 func (i *image) Digest() (v1.Hash, error) {
+	if err := i.compute(); err != nil {
+		return v1.Hash{}, err
+	}
 	return partial.Digest(i)
 }
 
 // Manifest returns this image's Manifest object.
 func (i *image) Manifest() (*v1.Manifest, error) {
+	if err := i.compute(); err != nil {
+		return nil, err
+	}
 	return i.manifest, nil
 }
 
 // RawManifest returns the serialized bytes of Manifest()
 func (i *image) RawManifest() ([]byte, error) {
+	if err := i.compute(); err != nil {
+		return nil, err
+	}
 	return json.Marshal(i.manifest)
 }
 
@@ -254,7 +296,7 @@ func (i *image) LayerByDigest(h v1.Hash) (v1.Layer, error) {
 	if layer, ok := i.digestMap[h]; ok {
 		return layer, nil
 	}
-	return i.Image.LayerByDigest(h)
+	return i.base.LayerByDigest(h)
 }
 
 // LayerByDiffID is an analog to LayerByDigest, looking up by "diff id"
@@ -263,7 +305,7 @@ func (i *image) LayerByDiffID(h v1.Hash) (v1.Layer, error) {
 	if layer, ok := i.diffIDMap[h]; ok {
 		return layer, nil
 	}
-	return i.Image.LayerByDiffID(h)
+	return i.base.LayerByDiffID(h)
 }
 
 func validate(adds []Addendum) error {
@@ -468,6 +510,10 @@ func layerTime(layer v1.Layer, t time.Time) (v1.Layer, error) {
 		}
 	}
 
+	if err := tarWriter.Close(); err != nil {
+		return nil, err
+	}
+
 	b := w.Bytes()
 	// gzip the contents, then create the layer
 	opener := func() (io.ReadCloser, error) {

vendor/github.com/google/go-containerregistry/pkg/v1/mutate/rebase.go

@@ -17,10 +17,11 @@ package mutate
 import (
 	"fmt"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/empty"
 )
 
+// Rebase returns a new v1.Image where the oldBase in orig is replaced by newBase.
 func Rebase(orig, oldBase, newBase v1.Image) (v1.Image, error) {
 	// Verify that oldBase's layers are present in orig, otherwise orig is
 	// not based on oldBase at all.

vendor/github.com/google/go-containerregistry/pkg/v1/partial/compressed.go

@@ -17,7 +17,7 @@ package partial
 import (
 	"io"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
 )
 
@@ -91,11 +91,6 @@ type compressedImageExtender struct {
 // Assert that our extender type completes the v1.Image interface
 var _ v1.Image = (*compressedImageExtender)(nil)
 
-// BlobSet implements v1.Image
-func (i *compressedImageExtender) BlobSet() (map[v1.Hash]struct{}, error) {
-	return BlobSet(i)
-}
-
 // Digest implements v1.Image
 func (i *compressedImageExtender) Digest() (v1.Hash, error) {
 	return Digest(i)
@@ -125,11 +120,6 @@ func (i *compressedImageExtender) Layers() ([]v1.Layer, error) {
 
 // LayerByDigest implements v1.Image
 func (i *compressedImageExtender) LayerByDigest(h v1.Hash) (v1.Layer, error) {
-	if cfgName, err := i.ConfigName(); err != nil {
-		return nil, err
-	} else if cfgName == h {
-		return ConfigLayer(i)
-	}
 	cl, err := i.CompressedImageCore.LayerByDigest(h)
 	if err != nil {
 		return nil, err

vendor/github.com/google/go-containerregistry/pkg/v1/partial/uncompressed.go

@@ -19,7 +19,7 @@ import (
 	"io"
 	"sync"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
 )
@@ -112,11 +112,6 @@ type uncompressedImageExtender struct {
 // Assert that our extender type completes the v1.Image interface
 var _ v1.Image = (*uncompressedImageExtender)(nil)
 
-// BlobSet implements v1.Image
-func (i *uncompressedImageExtender) BlobSet() (map[v1.Hash]struct{}, error) {
-	return BlobSet(i)
-}
-
 // Digest implements v1.Image
 func (i *uncompressedImageExtender) Digest() (v1.Hash, error) {
 	return Digest(i)
@@ -220,13 +215,6 @@ func (i *uncompressedImageExtender) LayerByDiffID(diffID v1.Hash) (v1.Layer, err
 
 // LayerByDigest implements v1.Image
 func (i *uncompressedImageExtender) LayerByDigest(h v1.Hash) (v1.Layer, error) {
-	// Support returning the ConfigFile when asked for its hash.
-	if cfgName, err := i.ConfigName(); err != nil {
-		return nil, err
-	} else if cfgName == h {
-		return ConfigLayer(i)
-	}
-
 	diffID, err := BlobToDiffID(i, h)
 	if err != nil {
 		return nil, err

vendor/github.com/google/go-containerregistry/pkg/v1/partial/with.go

@@ -19,8 +19,9 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/ioutil"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
 )
 
@@ -49,8 +50,6 @@ func ConfigName(i WithRawConfigFile) (v1.Hash, error) {
 	return h, err
 }
 
-// configLayer implements v1.Layer from the raw config bytes.
-// This is so that clients (e.g. remote) can access the config as a blob.
 type configLayer struct {
 	hash    v1.Hash
 	content []byte
@@ -68,12 +67,12 @@ func (cl *configLayer) DiffID() (v1.Hash, error) {
 
 // Uncompressed implements v1.Layer
 func (cl *configLayer) Uncompressed() (io.ReadCloser, error) {
-	return v1util.NopReadCloser(bytes.NewBuffer(cl.content)), nil
+	return ioutil.NopCloser(bytes.NewBuffer(cl.content)), nil
 }
 
 // Compressed implements v1.Layer
 func (cl *configLayer) Compressed() (io.ReadCloser, error) {
-	return v1util.NopReadCloser(bytes.NewBuffer(cl.content)), nil
+	return ioutil.NopCloser(bytes.NewBuffer(cl.content)), nil
 }
 
 // Size implements v1.Layer
@@ -83,6 +82,8 @@ func (cl *configLayer) Size() (int64, error) {
 
 var _ v1.Layer = (*configLayer)(nil)
 
+// ConfigLayer implements v1.Layer from the raw config bytes.
+// This is so that clients (e.g. remote) can access the config as a blob.
 func ConfigLayer(i WithRawConfigFile) (v1.Layer, error) {
 	h, err := ConfigName(i)
 	if err != nil {
@@ -190,20 +191,6 @@ func FSLayers(i WithManifest) ([]v1.Hash, error) {
 	return fsl, nil
 }
 
-// BlobSet is a helper for implementing v1.Image
-func BlobSet(i WithManifest) (map[v1.Hash]struct{}, error) {
-	m, err := i.Manifest()
-	if err != nil {
-		return nil, err
-	}
-	bs := make(map[v1.Hash]struct{})
-	for _, l := range m.Layers {
-		bs[l.Digest] = struct{}{}
-	}
-	bs[m.Config.Digest] = struct{}{}
-	return bs, nil
-}
-
 // BlobSize is a helper for implementing v1.Image
 func BlobSize(i WithManifest, h v1.Hash) (int64, error) {
 	m, err := i.Manifest()

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

@@ -20,12 +20,12 @@ import (
 	"crypto/rand"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"time"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/partial"
 	"github.com/google/go-containerregistry/pkg/v1/types"
-	"github.com/google/go-containerregistry/pkg/v1/v1util"
 )
 
 // uncompressedLayer implements partial.UncompressedLayer from raw bytes.
@@ -42,7 +42,7 @@ func (ul *uncompressedLayer) DiffID() (v1.Hash, error) {
 
 // Uncompressed implements partial.UncompressedLayer
 func (ul *uncompressedLayer) Uncompressed() (io.ReadCloser, error) {
-	return v1util.NopReadCloser(bytes.NewBuffer(ul.content)), nil
+	return ioutil.NopCloser(bytes.NewBuffer(ul.content)), nil
 }
 
 var _ partial.UncompressedLayer = (*uncompressedLayer)(nil)
@@ -54,14 +54,18 @@ func Image(byteSize, layers int64) (v1.Image, error) {
 		var b bytes.Buffer
 		tw := tar.NewWriter(&b)
 		if err := tw.WriteHeader(&tar.Header{
-			Name: fmt.Sprintf("random_file_%d.txt", i),
-			Size: byteSize,
+			Name:     fmt.Sprintf("random_file_%d.txt", i),
+			Size:     byteSize,
+			Typeflag: tar.TypeRegA,
 		}); err != nil {
 			return nil, err
 		}
 		if _, err := io.CopyN(tw, rand.Reader, byteSize); err != nil {
 			return nil, err
 		}
+		if err := tw.Close(); err != nil {
+			return nil, err
+		}
 		bts := b.Bytes()
 		h, _, err := v1.SHA256(bytes.NewReader(bts))
 		if err != nil {
@@ -75,6 +79,9 @@ func Image(byteSize, layers int64) (v1.Image, error) {
 
 	cfg := &v1.ConfigFile{}
 
+	// Some clients check this.
+	cfg.RootFS.Type = "layers"
+
 	// It is ok that iteration order is random in Go, because this is the random image anyways.
 	for k := range layerz {
 		cfg.RootFS.DiffIDs = append(cfg.RootFS.DiffIDs, k)

vendor/github.com/google/go-containerregistry/pkg/v1/random/index.go

@@ -0,0 +1,106 @@
+// 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 random
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+type randomIndex struct {
+	images   map[v1.Hash]v1.Image
+	manifest *v1.IndexManifest
+}
+
+// Index returns a pseudo-randomly generated ImageIndex with count images, each
+// having the given number of layers of size byteSize.
+func Index(byteSize, layers, count int64) (v1.ImageIndex, error) {
+	manifest := v1.IndexManifest{
+		SchemaVersion: 2,
+		Manifests:     []v1.Descriptor{},
+	}
+
+	images := make(map[v1.Hash]v1.Image)
+	for i := int64(0); i < count; i++ {
+		img, err := Image(byteSize, layers)
+		if err != nil {
+			return nil, err
+		}
+
+		rawManifest, err := img.RawManifest()
+		if err != nil {
+			return nil, err
+		}
+		digest, size, err := v1.SHA256(bytes.NewReader(rawManifest))
+		if err != nil {
+			return nil, err
+		}
+		mediaType, err := img.MediaType()
+		if err != nil {
+			return nil, err
+		}
+
+		manifest.Manifests = append(manifest.Manifests, v1.Descriptor{
+			Digest:    digest,
+			Size:      size,
+			MediaType: mediaType,
+		})
+
+		images[digest] = img
+	}
+
+	return &randomIndex{
+		images:   images,
+		manifest: &manifest,
+	}, nil
+}
+
+func (i *randomIndex) MediaType() (types.MediaType, error) {
+	return types.OCIImageIndex, nil
+}
+
+func (i *randomIndex) Digest() (v1.Hash, error) {
+	return partial.Digest(i)
+}
+
+func (i *randomIndex) IndexManifest() (*v1.IndexManifest, error) {
+	return i.manifest, nil
+}
+
+func (i *randomIndex) RawManifest() ([]byte, error) {
+	m, err := i.IndexManifest()
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(m)
+}
+
+func (i *randomIndex) Image(h v1.Hash) (v1.Image, error) {
+	if img, ok := i.images[h]; ok {
+		return img, nil
+	}
+
+	return nil, fmt.Errorf("image not found: %v", h)
+}
+
+func (i *randomIndex) ImageIndex(h v1.Hash) (v1.ImageIndex, error) {
+	// This is a single level index (for now?).
+	return nil, fmt.Errorf("image not found: %v", h)
+}

vendor/github.com/google/go-containerregistry/pkg/v1/remote/check.go

@@ -0,0 +1,56 @@
+package remote
+
+import (
+	"net/http"
+
+	"github.com/google/go-containerregistry/pkg/authn"
+	"github.com/google/go-containerregistry/pkg/name"
+	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
+)
+
+// CheckPushPermission returns an error if the given keychain cannot authorize
+// a push operation to the given ref.
+//
+// This can be useful to check whether the caller has permission to push an
+// image before doing work to construct the image.
+//
+// TODO(#412): Remove the need for this method.
+func CheckPushPermission(ref name.Reference, kc authn.Keychain, t http.RoundTripper) error {
+	auth, err := kc.Resolve(ref.Context().Registry)
+	if err != nil {
+		return err
+	}
+
+	scopes := []string{ref.Scope(transport.PushScope)}
+	tr, err := transport.New(ref.Context().Registry, auth, t, scopes)
+	if err != nil {
+		return err
+	}
+	// TODO(jasonhall): Against GCR, just doing the token handshake is
+	// enough, but this doesn't extend to Dockerhub
+	// (https://github.com/docker/hub-feedback/issues/1771), so we actually
+	// need to initiate an upload to tell whether the credentials can
+	// authorize a push. Figure out how to return early here when we can,
+	// to avoid a roundtrip for spec-compliant registries.
+	w := writer{
+		ref:    ref,
+		client: &http.Client{Transport: tr},
+	}
+	loc, _, err := w.initiateUpload("", "")
+	if loc != "" {
+		// Since we're only initiating the upload to check whether we
+		// can, we should attempt to cancel it, in case initiating
+		// reserves some resources on the server. We shouldn't wait for
+		// cancelling to complete, and we don't care if it fails.
+		go w.cancelUpload(loc)
+	}
+	return err
+}
+
+func (w *writer) cancelUpload(loc string) {
+	req, err := http.NewRequest(http.MethodDelete, loc, nil)
+	if err != nil {
+		return
+	}
+	_, _ = w.client.Do(req)
+}

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

@@ -21,27 +21,35 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/url"
+	"strings"
 	"sync"
 
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/partial"
 	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
 	"github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
 )
 
+var defaultPlatform = v1.Platform{
+	Architecture: "amd64",
+	OS:           "linux",
+}
+
 // remoteImage accesses an image from a remote registry
 type remoteImage struct {
-	ref          name.Reference
-	client       *http.Client
+	fetcher
 	manifestLock sync.Mutex // Protects manifest
 	manifest     []byte
 	configLock   sync.Mutex // Protects config
 	config       []byte
+	mediaType    types.MediaType
+	platform     v1.Platform
 }
 
+// ImageOption is a functional option for Image.
 type ImageOption func(*imageOpener) error
 
 var _ partial.CompressedImageCore = (*remoteImage)(nil)
@@ -51,6 +59,7 @@ type imageOpener struct {
 	transport http.RoundTripper
 	ref       name.Reference
 	client    *http.Client
+	platform  v1.Platform
 }
 
 func (i *imageOpener) Open() (v1.Image, error) {
@@ -59,8 +68,11 @@ func (i *imageOpener) Open() (v1.Image, error) {
 		return nil, err
 	}
 	ri := &remoteImage{
-		ref:    i.ref,
-		client: &http.Client{Transport: tr},
+		fetcher: fetcher{
+			Ref:    i.ref,
+			Client: &http.Client{Transport: tr},
+		},
+		platform: i.platform,
 	}
 	imgCore, err := partial.CompressedToImage(ri)
 	if err != nil {
@@ -81,6 +93,7 @@ func Image(ref name.Reference, options ...ImageOption) (v1.Image, error) {
 		auth:      authn.Anonymous,
 		transport: http.DefaultTransport,
 		ref:       ref,
+		platform:  defaultPlatform,
 	}
 
 	for _, option := range options {
@@ -91,58 +104,57 @@ func Image(ref name.Reference, options ...ImageOption) (v1.Image, error) {
 	return img.Open()
 }
 
-func (r *remoteImage) url(resource, identifier string) url.URL {
+// fetcher implements methods for reading from a remote image.
+type fetcher struct {
+	Ref    name.Reference
+	Client *http.Client
+}
+
+// url returns a url.Url for the specified path in the context of this remote image reference.
+func (f *fetcher) url(resource, identifier string) url.URL {
 	return url.URL{
-		Scheme: r.ref.Context().Registry.Scheme(),
-		Host:   r.ref.Context().RegistryStr(),
-		Path:   fmt.Sprintf("/v2/%s/%s/%s", r.ref.Context().RepositoryStr(), resource, identifier),
+		Scheme: f.Ref.Context().Registry.Scheme(),
+		Host:   f.Ref.Context().RegistryStr(),
+		Path:   fmt.Sprintf("/v2/%s/%s/%s", f.Ref.Context().RepositoryStr(), resource, identifier),
 	}
 }
 
-func (r *remoteImage) MediaType() (types.MediaType, error) {
-	// TODO(jonjohnsonjr): Determine this based on response.
-	return types.DockerManifestSchema2, nil
-}
-
-// TODO(jonjohnsonjr): Handle manifest lists.
-func (r *remoteImage) RawManifest() ([]byte, error) {
-	r.manifestLock.Lock()
-	defer r.manifestLock.Unlock()
-	if r.manifest != nil {
-		return r.manifest, nil
-	}
-
-	u := r.url("manifests", r.ref.Identifier())
+func (f *fetcher) fetchManifest(acceptable []types.MediaType) ([]byte, *v1.Descriptor, error) {
+	u := f.url("manifests", f.Ref.Identifier())
 	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
-	// TODO(jonjohnsonjr): Accept OCI manifest, manifest list, and image index.
-	req.Header.Set("Accept", string(types.DockerManifestSchema2))
-	resp, err := r.client.Do(req)
+	accept := []string{}
+	for _, mt := range acceptable {
+		accept = append(accept, string(mt))
+	}
+	req.Header.Set("Accept", strings.Join(accept, ","))
+
+	resp, err := f.Client.Do(req)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	defer resp.Body.Close()
 
-	if err := CheckError(resp, http.StatusOK); err != nil {
-		return nil, err
+	if err := transport.CheckError(resp, http.StatusOK); err != nil {
+		return nil, nil, err
 	}
 
 	manifest, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
-	digest, _, err := v1.SHA256(bytes.NewReader(manifest))
+	digest, size, err := v1.SHA256(bytes.NewReader(manifest))
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
 	// Validate the digest matches what we asked for, if pulling by digest.
-	if dgst, ok := r.ref.(name.Digest); ok {
+	if dgst, ok := f.Ref.(name.Digest); ok {
 		if digest.String() != dgst.DigestStr() {
-			return nil, fmt.Errorf("manifest digest: %q does not match requested digest: %q for %q", digest, dgst.DigestStr(), r.ref)
+			return nil, nil, fmt.Errorf("manifest digest: %q does not match requested digest: %q for %q", digest, dgst.DigestStr(), f.Ref)
 		}
 	} else {
 		// Do nothing for tags; I give up.
@@ -155,6 +167,52 @@ func (r *remoteImage) RawManifest() ([]byte, error) {
 		// https://github.com/GoogleContainerTools/kaniko/issues/298
 	}
 
+	// Return all this info since we have to calculate it anyway.
+	desc := v1.Descriptor{
+		Digest:    digest,
+		Size:      size,
+		MediaType: types.MediaType(resp.Header.Get("Content-Type")),
+	}
+
+	return manifest, &desc, nil
+}
+
+func (r *remoteImage) MediaType() (types.MediaType, error) {
+	if string(r.mediaType) != "" {
+		return r.mediaType, nil
+	}
+	return types.DockerManifestSchema2, nil
+}
+
+// TODO(jonjohnsonjr): Handle manifest lists.
+func (r *remoteImage) RawManifest() ([]byte, error) {
+	r.manifestLock.Lock()
+	defer r.manifestLock.Unlock()
+	if r.manifest != nil {
+		return r.manifest, nil
+	}
+
+	acceptable := []types.MediaType{
+		types.DockerManifestSchema2,
+		types.OCIManifestSchema1,
+		// We'll resolve these to an image based on the platform.
+		types.DockerManifestList,
+		types.OCIImageIndex,
+	}
+	manifest, desc, err := r.fetchManifest(acceptable)
+	if err != nil {
+		return nil, err
+	}
+
+	// We want an image but the registry has an index, resolve it to an image.
+	for desc.MediaType == types.DockerManifestList || desc.MediaType == types.OCIImageIndex {
+		manifest, desc, err = r.matchImage(manifest)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	r.mediaType = desc.MediaType
 	r.manifest = manifest
 	return r.manifest, nil
 }
@@ -202,12 +260,12 @@ func (rl *remoteLayer) Digest() (v1.Hash, error) {
 // Compressed implements partial.CompressedLayer
 func (rl *remoteLayer) Compressed() (io.ReadCloser, error) {
 	u := rl.ri.url("blobs", rl.digest.String())
-	resp, err := rl.ri.client.Get(u.String())
+	resp, err := rl.ri.Client.Get(u.String())
 	if err != nil {
 		return nil, err
 	}
 
-	if err := CheckError(resp, http.StatusOK); err != nil {
+	if err := transport.CheckError(resp, http.StatusOK); err != nil {
 		resp.Body.Close()
 		return nil, err
 	}
@@ -244,3 +302,36 @@ func (r *remoteImage) LayerByDigest(h v1.Hash) (partial.CompressedLayer, error)
 		digest: h,
 	}, nil
 }
+
+// This naively matches the first manifest with matching Architecture and OS.
+//
+// We should probably use this instead:
+//	 github.com/containerd/containerd/platforms
+//
+// But first we'd need to migrate to:
+//   github.com/opencontainers/image-spec/specs-go/v1
+func (r *remoteImage) matchImage(rawIndex []byte) ([]byte, *v1.Descriptor, error) {
+	index, err := v1.ParseIndexManifest(bytes.NewReader(rawIndex))
+	if err != nil {
+		return nil, nil, err
+	}
+	for _, childDesc := range index.Manifests {
+		// If platform is missing from child descriptor, assume it's amd64/linux.
+		p := defaultPlatform
+		if childDesc.Platform != nil {
+			p = *childDesc.Platform
+		}
+		if r.platform.Architecture == p.Architecture && r.platform.OS == p.OS {
+			childRef, err := name.ParseReference(fmt.Sprintf("%s@%s", r.Ref.Context(), childDesc.Digest), name.StrictValidation)
+			if err != nil {
+				return nil, nil, err
+			}
+			r.fetcher = fetcher{
+				Client: r.Client,
+				Ref:    childRef,
+			}
+			return r.fetchManifest([]types.MediaType{childDesc.MediaType})
+		}
+	}
+	return nil, nil, fmt.Errorf("no matching image for %s/%s, index: %s", r.platform.Architecture, r.platform.OS, string(rawIndex))
+}

vendor/github.com/google/go-containerregistry/pkg/v1/remote/index.go

@@ -0,0 +1,139 @@
+// 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 remote
+
+import (
+	"bytes"
+	"fmt"
+	"net/http"
+	"sync"
+
+	"github.com/google/go-containerregistry/pkg/authn"
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+// remoteIndex accesses an index from a remote registry
+type remoteIndex struct {
+	fetcher
+	manifestLock sync.Mutex // Protects manifest
+	manifest     []byte
+	mediaType    types.MediaType
+}
+
+// Index provides access to a remote index reference, applying functional options
+// to the underlying imageOpener before resolving the reference into a v1.ImageIndex.
+func Index(ref name.Reference, options ...ImageOption) (v1.ImageIndex, error) {
+	i := &imageOpener{
+		auth:      authn.Anonymous,
+		transport: http.DefaultTransport,
+		ref:       ref,
+	}
+
+	for _, option := range options {
+		if err := option(i); err != nil {
+			return nil, err
+		}
+	}
+	tr, err := transport.New(i.ref.Context().Registry, i.auth, i.transport, []string{i.ref.Scope(transport.PullScope)})
+	if err != nil {
+		return nil, err
+	}
+	return &remoteIndex{
+		fetcher: fetcher{
+			Ref:    i.ref,
+			Client: &http.Client{Transport: tr},
+		},
+	}, nil
+}
+
+func (r *remoteIndex) MediaType() (types.MediaType, error) {
+	if string(r.mediaType) != "" {
+		return r.mediaType, nil
+	}
+	return types.DockerManifestList, nil
+}
+
+func (r *remoteIndex) Digest() (v1.Hash, error) {
+	return partial.Digest(r)
+}
+
+func (r *remoteIndex) RawManifest() ([]byte, error) {
+	r.manifestLock.Lock()
+	defer r.manifestLock.Unlock()
+	if r.manifest != nil {
+		return r.manifest, nil
+	}
+
+	acceptable := []types.MediaType{
+		types.DockerManifestList,
+		types.OCIImageIndex,
+	}
+	manifest, desc, err := r.fetchManifest(acceptable)
+	if err != nil {
+		return nil, err
+	}
+
+	r.mediaType = desc.MediaType
+	r.manifest = manifest
+	return r.manifest, nil
+}
+
+func (r *remoteIndex) IndexManifest() (*v1.IndexManifest, error) {
+	b, err := r.RawManifest()
+	if err != nil {
+		return nil, err
+	}
+	return v1.ParseIndexManifest(bytes.NewReader(b))
+}
+
+func (r *remoteIndex) Image(h v1.Hash) (v1.Image, error) {
+	imgRef, err := name.ParseReference(fmt.Sprintf("%s@%s", r.Ref.Context(), h), name.StrictValidation)
+	if err != nil {
+		return nil, err
+	}
+	ri := &remoteImage{
+		fetcher: fetcher{
+			Ref:    imgRef,
+			Client: r.Client,
+		},
+	}
+	imgCore, err := partial.CompressedToImage(ri)
+	if err != nil {
+		return imgCore, err
+	}
+	// Wrap the v1.Layers returned by this v1.Image in a hint for downstream
+	// remote.Write calls to facilitate cross-repo "mounting".
+	return &mountableImage{
+		Image:     imgCore,
+		Reference: r.Ref,
+	}, nil
+}
+
+func (r *remoteIndex) ImageIndex(h v1.Hash) (v1.ImageIndex, error) {
+	idxRef, err := name.ParseReference(fmt.Sprintf("%s@%s", r.Ref.Context(), h), name.StrictValidation)
+	if err != nil {
+		return nil, err
+	}
+	return &remoteIndex{
+		fetcher: fetcher{
+			Ref:    idxRef,
+			Client: r.Client,
+		},
+	}, nil
+}

vendor/github.com/google/go-containerregistry/pkg/v1/remote/list.go

@@ -25,12 +25,12 @@ import (
 	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
 )
 
-type Tags struct {
+type tags struct {
 	Name string   `json:"name"`
 	Tags []string `json:"tags"`
 }
 
-// TODO(jonjohnsonjr): return []name.Tag?
+// List calls /tags/list for the given repository.
 func List(repo name.Repository, auth authn.Authenticator, t http.RoundTripper) ([]string, error) {
 	scopes := []string{repo.Scope(transport.PullScope)}
 	tr, err := transport.New(repo.Registry, auth, t, scopes)
@@ -51,14 +51,14 @@ func List(repo name.Repository, auth authn.Authenticator, t http.RoundTripper) (
 	}
 	defer resp.Body.Close()
 
-	if err := CheckError(resp, http.StatusOK); err != nil {
+	if err := transport.CheckError(resp, http.StatusOK); err != nil {
 		return nil, err
 	}
 
-	tags := Tags{}
-	if err := json.NewDecoder(resp.Body).Decode(&tags); err != nil {
+	parsed := tags{}
+	if err := json.NewDecoder(resp.Body).Decode(&parsed); err != nil {
 		return nil, err
 	}
 
-	return tags.Tags, nil
+	return parsed.Tags, nil
 }

vendor/github.com/google/go-containerregistry/pkg/v1/remote/mount.go

@@ -16,7 +16,7 @@ package remote
 
 import (
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 )
 
 // MountableLayer wraps a v1.Layer in a shim that enables the layer to be

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

@@ -19,6 +19,7 @@ import (
 	"net/http"
 
 	"github.com/google/go-containerregistry/pkg/authn"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 )
 
 // WithTransport is a functional option for overriding the default transport
@@ -54,3 +55,10 @@ func WithAuthFromKeychain(keys authn.Keychain) ImageOption {
 		return nil
 	}
 }
+
+func WithPlatform(p v1.Platform) ImageOption {
+	return func(i *imageOpener) error {
+		i.platform = p
+		return nil
+	}
+}

vendor/github.com/google/go-containerregistry/pkg/v1/remote/transport/bearer.go

@@ -15,9 +15,8 @@
 package transport
 
 import (
-	"fmt"
-
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -40,6 +39,8 @@ type bearerTransport struct {
 	// See https://docs.docker.com/registry/spec/auth/token/
 	service string
 	scopes  []string
+	// Scheme we should use, determined by ping response.
+	scheme string
 }
 
 var _ http.RoundTripper = (*bearerTransport)(nil)
@@ -61,6 +62,8 @@ func (bt *bearerTransport) RoundTrip(in *http.Request) (*http.Response, error) {
 			in.Header.Set("Authorization", hdr)
 		}
 		in.Header.Set("User-Agent", transportName)
+
+		in.URL.Scheme = bt.scheme
 		return bt.inner.RoundTrip(in)
 	}
 
@@ -103,6 +106,10 @@ func (bt *bearerTransport) refresh() error {
 	}
 	defer resp.Body.Close()
 
+	if err := CheckError(resp, http.StatusOK); err != nil {
+		return err
+	}
+
 	content, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return err

vendor/github.com/google/go-containerregistry/pkg/v1/remote/transport/error.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package remote
+package transport
 
 import (
 	"encoding/json"
@@ -35,7 +35,7 @@ var _ error = (*Error)(nil)
 func (e *Error) Error() string {
 	switch len(e.Errors) {
 	case 0:
-		return "<empty remote.Error response>"
+		return "<empty transport.Error response>"
 	case 1:
 		return e.Errors[0].String()
 	default:
@@ -55,9 +55,13 @@ type Diagnostic struct {
 	Detail  interface{} `json:"detail,omitempty"`
 }
 
-// String stringifies the Diagnostic
+// String stringifies the Diagnostic in the form: $Code: $Message[; $Detail]
 func (d Diagnostic) String() string {
-	return fmt.Sprintf("%s: %q", d.Code, d.Message)
+	msg := fmt.Sprintf("%s: %s", d.Code, d.Message)
+	if d.Detail != nil {
+		msg = fmt.Sprintf("%s; %v", msg, d.Detail)
+	}
+	return msg
 }
 
 // ErrorCode is an enumeration of supported error codes.
@@ -83,6 +87,7 @@ const (
 	UnsupportedErrorCode         ErrorCode = "UNSUPPORTED"
 )
 
+// CheckError returns a structured error if the response status is not in codes.
 func CheckError(resp *http.Response, codes ...int) error {
 	for _, code := range codes {
 		if resp.StatusCode == code {

vendor/github.com/google/go-containerregistry/pkg/v1/remote/transport/ping.go

@@ -36,6 +36,9 @@ type pingResp struct {
 	// Following the challenge there are often key/value pairs
 	// e.g. Bearer service="gcr.io",realm="https://auth.gcr.io/v36/tokenz"
 	parameters map[string]string
+
+	// The registry's scheme to use. Communicates whether we fell back to http.
+	scheme string
 }
 
 func (c challenge) Canonical() challenge {
@@ -63,31 +66,50 @@ func parseChallenge(suffix string) map[string]string {
 func ping(reg name.Registry, t http.RoundTripper) (*pingResp, error) {
 	client := http.Client{Transport: t}
 
-	url := fmt.Sprintf("%s://%s/v2/", reg.Scheme(), reg.Name())
-	resp, err := client.Get(url)
-	if err != nil {
-		return nil, err
+	// This first attempts to use "https" for every request, falling back to http
+	// if the registry matches our localhost heuristic or if it is intentionally
+	// set to insecure via name.NewInsecureRegistry.
+	schemes := []string{"https"}
+	if reg.Scheme() == "http" {
+		schemes = append(schemes, "http")
 	}
-	defer resp.Body.Close()
 
-	switch resp.StatusCode {
-	case http.StatusOK:
-		// If we get a 200, then no authentication is needed.
-		return &pingResp{challenge: anonymous}, nil
-	case http.StatusUnauthorized:
-		wac := resp.Header.Get(http.CanonicalHeaderKey("WWW-Authenticate"))
-		if parts := strings.SplitN(wac, " ", 2); len(parts) == 2 {
-			// If there are two parts, then parse the challenge parameters.
+	var connErr error
+	for _, scheme := range schemes {
+		url := fmt.Sprintf("%s://%s/v2/", scheme, reg.Name())
+		resp, err := client.Get(url)
+		if err != nil {
+			connErr = err
+			// Potentially retry with http.
+			continue
+		}
+		defer resp.Body.Close()
+
+		switch resp.StatusCode {
+		case http.StatusOK:
+			// If we get a 200, then no authentication is needed.
 			return &pingResp{
-				challenge:  challenge(parts[0]).Canonical(),
-				parameters: parseChallenge(parts[1]),
+				challenge: anonymous,
+				scheme:    scheme,
 			}, nil
+		case http.StatusUnauthorized:
+			wac := resp.Header.Get(http.CanonicalHeaderKey("WWW-Authenticate"))
+			if parts := strings.SplitN(wac, " ", 2); len(parts) == 2 {
+				// If there are two parts, then parse the challenge parameters.
+				return &pingResp{
+					challenge:  challenge(parts[0]).Canonical(),
+					parameters: parseChallenge(parts[1]),
+					scheme:     scheme,
+				}, nil
+			}
+			// Otherwise, just return the challenge without parameters.
+			return &pingResp{
+				challenge: challenge(wac).Canonical(),
+				scheme:    scheme,
+			}, nil
+		default:
+			return nil, fmt.Errorf("unrecognized HTTP status: %v", resp.Status)
 		}
-		// Otherwise, just return the challenge without parameters.
-		return &pingResp{
-			challenge: challenge(wac).Canonical(),
-		}, nil
-	default:
-		return nil, fmt.Errorf("unrecognized HTTP status: %v", resp.Status)
 	}
+	return nil, connErr
 }

vendor/github.com/google/go-containerregistry/pkg/v1/remote/transport/transport.go

@@ -73,6 +73,7 @@ func New(reg name.Registry, auth authn.Authenticator, t http.RoundTripper, scope
 			registry: reg,
 			service:  service,
 			scopes:   scopes,
+			scheme:   pr.scheme,
 		}
 		if err := bt.refresh(); err != nil {
 			return nil, err

vendor/github.com/google/go-containerregistry/pkg/v1/remote/write.go

@@ -18,16 +18,27 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
 	"net/url"
 
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
 	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
+	"github.com/google/go-containerregistry/pkg/v1/stream"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+	"golang.org/x/sync/errgroup"
 )
 
+type manifest interface {
+	RawManifest() ([]byte, error)
+	MediaType() (types.MediaType, error)
+	Digest() (v1.Hash, error)
+}
+
 // Write pushes the provided img to the specified image reference.
 func Write(ref name.Reference, img v1.Image, auth authn.Authenticator, t http.RoundTripper) error {
 	ls, err := img.Layers()
@@ -41,48 +52,74 @@ func Write(ref name.Reference, img v1.Image, auth authn.Authenticator, t http.Ro
 		return err
 	}
 	w := writer{
-		ref:     ref,
-		client:  &http.Client{Transport: tr},
-		img:     img,
+		ref:    ref,
+		client: &http.Client{Transport: tr},
 	}
 
-	bs, err := img.BlobSet()
-	if err != nil {
-		return err
-	}
-
-	// Spin up go routines to publish each of the members of BlobSet(),
-	// and use an error channel to collect their results.
-	errCh := make(chan error)
-	defer close(errCh)
-	for h := range bs {
-		go func(h v1.Hash) {
-			errCh <- w.uploadOne(h)
-		}(h)
-	}
-
-	// Now wait for all of the blob uploads to complete.
-	var errors []error
-	for _ = range bs {
-		if err := <-errCh; err != nil {
-			errors = append(errors, err)
+	// Upload individual layers in goroutines and collect any errors.
+	// If we can dedupe by the layer digest, try to do so. If the layer is
+	// a stream.Layer, we can't dedupe and might re-upload.
+	var g errgroup.Group
+	uploaded := map[v1.Hash]bool{}
+	for _, l := range ls {
+		l := l
+		if _, ok := l.(*stream.Layer); !ok {
+			h, err := l.Digest()
+			if err != nil {
+				return err
+			}
+			// If we can determine the layer's digest ahead of
+			// time, use it to dedupe uploads.
+			if uploaded[h] {
+				continue // Already uploading.
+			}
+			uploaded[h] = true
 		}
+
+		g.Go(func() error {
+			return w.uploadOne(l)
+		})
 	}
-	if len(errors) > 0 {
-		// Return the first error we encountered.
-		return errors[0]
+
+	if l, err := partial.ConfigLayer(img); err == stream.ErrNotComputed {
+		// We can't read the ConfigLayer, because of streaming layers, since the
+		// config hasn't been calculated yet.
+		if err := g.Wait(); err != nil {
+			return err
+		}
+
+		// Now that all the layers are uploaded, upload the config file blob.
+		l, err := partial.ConfigLayer(img)
+		if err != nil {
+			return err
+		}
+		if err := w.uploadOne(l); err != nil {
+			return err
+		}
+	} else if err != nil {
+		// This is an actual error, not a streaming error, just return it.
+		return err
+	} else {
+		// We *can* read the ConfigLayer, so upload it concurrently with the layers.
+		g.Go(func() error {
+			return w.uploadOne(l)
+		})
+
+		// Wait for the layers + config.
+		if err := g.Wait(); err != nil {
+			return err
+		}
 	}
 
 	// With all of the constituent elements uploaded, upload the manifest
 	// to commit the image.
-	return w.commitImage()
+	return w.commitImage(img)
 }
 
 // writer writes the elements of an image to a remote image reference.
 type writer struct {
-	ref     name.Reference
-	client  *http.Client
-	img     v1.Image
+	ref    name.Reference
+	client *http.Client
 }
 
 // url returns a url.Url for the specified path in the context of this remote image reference.
@@ -110,11 +147,11 @@ func (w *writer) nextLocation(resp *http.Response) (string, error) {
 	return resp.Request.URL.ResolveReference(u).String(), nil
 }
 
-// checkExisting checks if a blob exists already in the repository by making a
+// checkExistingBlob checks if a blob exists already in the repository by making a
 // HEAD request to the blob store API.  GCR performs an existence check on the
 // initiation if "mount" is specified, even if no "from" sources are specified.
 // However, this is not broadly applicable to all registries, e.g. ECR.
-func (w *writer) checkExisting(h v1.Hash) (bool, error) {
+func (w *writer) checkExistingBlob(h v1.Hash) (bool, error) {
 	u := w.url(fmt.Sprintf("/v2/%s/blobs/%s", w.ref.Context().RepositoryStr(), h.String()))
 
 	resp, err := w.client.Head(u.String())
@@ -123,7 +160,31 @@ func (w *writer) checkExisting(h v1.Hash) (bool, error) {
 	}
 	defer resp.Body.Close()
 
-	if err := CheckError(resp, http.StatusOK, http.StatusNotFound); err != nil {
+	if err := transport.CheckError(resp, http.StatusOK, http.StatusNotFound); err != nil {
+		return false, err
+	}
+
+	return resp.StatusCode == http.StatusOK, nil
+}
+
+// checkExistingManifest checks if a manifest exists already in the repository
+// by making a HEAD request to the manifest API.
+func (w *writer) checkExistingManifest(h v1.Hash, mt types.MediaType) (bool, error) {
+	u := w.url(fmt.Sprintf("/v2/%s/manifests/%s", w.ref.Context().RepositoryStr(), h.String()))
+
+	req, err := http.NewRequest(http.MethodHead, u.String(), nil)
+	if err != nil {
+		return false, err
+	}
+	req.Header.Set("Accept", string(mt))
+
+	resp, err := w.client.Do(req)
+	if err != nil {
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	if err := transport.CheckError(resp, http.StatusOK, http.StatusNotFound); err != nil {
 		return false, err
 	}
 
@@ -136,20 +197,13 @@ func (w *writer) checkExisting(h v1.Hash) (bool, error) {
 // On success, the layer was either mounted (nothing more to do) or a blob
 // upload was initiated and the body of that blob should be sent to the returned
 // location.
-func (w *writer) initiateUpload(h v1.Hash) (location string, mounted bool, err error) {
+func (w *writer) initiateUpload(from, mount string) (location string, mounted bool, err error) {
 	u := w.url(fmt.Sprintf("/v2/%s/blobs/uploads/", w.ref.Context().RepositoryStr()))
-	uv := url.Values{
-		"mount": []string{h.String()},
-	}
-	l, err := w.img.LayerByDigest(h)
-	if err != nil {
-		return "", false, err
-	}
-
-	if ml, ok := l.(*MountableLayer); ok {
-		if w.ref.Context().RegistryStr() == ml.Reference.Context().RegistryStr() {
-			uv["from"] = []string{ml.Reference.Context().RepositoryStr()}
-		}
+	uv := url.Values{}
+	if mount != "" && from != "" {
+		// Quay will fail if we specify a "mount" without a "from".
+		uv["mount"] = []string{mount}
+		uv["from"] = []string{from}
 	}
 	u.RawQuery = uv.Encode()
 
@@ -160,7 +214,7 @@ func (w *writer) initiateUpload(h v1.Hash) (location string, mounted bool, err e
 	}
 	defer resp.Body.Close()
 
-	if err := CheckError(resp, http.StatusCreated, http.StatusAccepted); err != nil {
+	if err := transport.CheckError(resp, http.StatusCreated, http.StatusAccepted); err != nil {
 		return "", false, err
 	}
 
@@ -181,15 +235,7 @@ func (w *writer) initiateUpload(h v1.Hash) (location string, mounted bool, err e
 // streamBlob streams the contents of the blob to the specified location.
 // On failure, this will return an error.  On success, this will return the location
 // header indicating how to commit the streamed blob.
-func (w *writer) streamBlob(h v1.Hash, streamLocation string) (commitLocation string, err error) {
-	l, err := w.img.LayerByDigest(h)
-	if err != nil {
-		return "", err
-	}
-	blob, err := l.Compressed()
-	if err != nil {
-		return "", err
-	}
+func (w *writer) streamBlob(blob io.ReadCloser, streamLocation string) (commitLocation string, err error) {
 	defer blob.Close()
 
 	req, err := http.NewRequest(http.MethodPatch, streamLocation, blob)
@@ -203,7 +249,7 @@ func (w *writer) streamBlob(h v1.Hash, streamLocation string) (commitLocation st
 	}
 	defer resp.Body.Close()
 
-	if err := CheckError(resp, http.StatusNoContent, http.StatusAccepted, http.StatusCreated); err != nil {
+	if err := transport.CheckError(resp, http.StatusNoContent, http.StatusAccepted, http.StatusCreated); err != nil {
 		return "", err
 	}
 
@@ -212,14 +258,15 @@ func (w *writer) streamBlob(h v1.Hash, streamLocation string) (commitLocation st
 	return w.nextLocation(resp)
 }
 
-// commitBlob commits this blob by sending a PUT to the location returned from streaming the blob.
-func (w *writer) commitBlob(h v1.Hash, location string) (err error) {
+// commitBlob commits this blob by sending a PUT to the location returned from
+// streaming the blob.
+func (w *writer) commitBlob(location, digest string) error {
 	u, err := url.Parse(location)
 	if err != nil {
 		return err
 	}
 	v := u.Query()
-	v.Set("digest", h.String())
+	v.Set("digest", digest)
 	u.RawQuery = v.Encode()
 
 	req, err := http.NewRequest(http.MethodPut, u.String(), nil)
@@ -233,47 +280,82 @@ func (w *writer) commitBlob(h v1.Hash, location string) (err error) {
 	}
 	defer resp.Body.Close()
 
-	return CheckError(resp, http.StatusCreated)
+	return transport.CheckError(resp, http.StatusCreated)
 }
 
 // uploadOne performs a complete upload of a single layer.
-func (w *writer) uploadOne(h v1.Hash) error {
-	existing, err := w.checkExisting(h)
-	if err != nil {
-		return err
+func (w *writer) uploadOne(l v1.Layer) error {
+	var from, mount, digest string
+	if _, ok := l.(*stream.Layer); !ok {
+		// Layer isn't streamable, we should take advantage of that to
+		// skip uploading if possible.
+		// By sending ?digest= in the request, we'll also check that
+		// our computed digest matches the one computed by the
+		// registry.
+		h, err := l.Digest()
+		if err != nil {
+			return err
+		}
+		digest = h.String()
+
+		existing, err := w.checkExistingBlob(h)
+		if err != nil {
+			return err
+		}
+		if existing {
+			log.Printf("existing blob: %v", h)
+			return nil
+		}
+
+		mount = h.String()
 	}
-	if existing {
-		log.Printf("existing blob: %v", h)
-		return nil
+	if ml, ok := l.(*MountableLayer); ok {
+		if w.ref.Context().RegistryStr() == ml.Reference.Context().RegistryStr() {
+			from = ml.Reference.Context().RepositoryStr()
+		}
 	}
 
-	location, mounted, err := w.initiateUpload(h)
+	location, mounted, err := w.initiateUpload(from, mount)
 	if err != nil {
 		return err
 	} else if mounted {
-		log.Printf("mounted blob: %v", h)
+		h, err := l.Digest()
+		if err != nil {
+			return err
+		}
+		log.Printf("mounted blob: %s", h.String())
 		return nil
 	}
 
-	location, err = w.streamBlob(h, location)
+	blob, err := l.Compressed()
+	if err != nil {
+		return err
+	}
+	location, err = w.streamBlob(blob, location)
 	if err != nil {
 		return err
 	}
 
-	if err := w.commitBlob(h, location); err != nil {
+	h, err := l.Digest()
+	if err != nil {
 		return err
 	}
-	log.Printf("pushed blob %v", h)
+	digest = h.String()
+
+	if err := w.commitBlob(location, digest); err != nil {
+		return err
+	}
+	log.Printf("pushed blob: %s", digest)
 	return nil
 }
 
 // commitImage does a PUT of the image's manifest.
-func (w *writer) commitImage() error {
-	raw, err := w.img.RawManifest()
+func (w *writer) commitImage(man manifest) error {
+	raw, err := man.RawManifest()
 	if err != nil {
 		return err
 	}
-	mt, err := w.img.MediaType()
+	mt, err := man.MediaType()
 	if err != nil {
 		return err
 	}
@@ -293,11 +375,11 @@ func (w *writer) commitImage() error {
 	}
 	defer resp.Body.Close()
 
-	if err := CheckError(resp, http.StatusOK, http.StatusCreated, http.StatusAccepted); err != nil {
+	if err := transport.CheckError(resp, http.StatusOK, http.StatusCreated, http.StatusAccepted); err != nil {
 		return err
 	}
 
-	digest, err := w.img.Digest()
+	digest, err := man.Digest()
 	if err != nil {
 		return err
 	}
@@ -324,11 +406,68 @@ func scopesForUploadingImage(ref name.Reference, layers []v1.Layer) []string {
 	// Push scope should be the first element because a few registries just look at the first scope to determine access.
 	scopes = append(scopes, ref.Scope(transport.PushScope))
 
-	for scope, _ := range scopeSet {
+	for scope := range scopeSet {
 		scopes = append(scopes, scope)
 	}
 
 	return scopes
 }
 
-// TODO(mattmoor): WriteIndex
+// WriteIndex pushes the provided ImageIndex to the specified image reference.
+// WriteIndex will attempt to push all of the referenced manifests before
+// attempting to push the ImageIndex, to retain referential integrity.
+func WriteIndex(ref name.Reference, ii v1.ImageIndex, auth authn.Authenticator, t http.RoundTripper) error {
+	index, err := ii.IndexManifest()
+	if err != nil {
+		return err
+	}
+
+	scopes := []string{ref.Scope(transport.PushScope)}
+	tr, err := transport.New(ref.Context().Registry, auth, t, scopes)
+	if err != nil {
+		return err
+	}
+	w := writer{
+		ref:    ref,
+		client: &http.Client{Transport: tr},
+	}
+
+	for _, desc := range index.Manifests {
+		ref, err := name.ParseReference(fmt.Sprintf("%s@%s", ref.Context(), desc.Digest), name.StrictValidation)
+		if err != nil {
+			return err
+		}
+		exists, err := w.checkExistingManifest(desc.Digest, desc.MediaType)
+		if err != nil {
+			return err
+		}
+		if exists {
+			log.Printf("existing manifest: %v", desc.Digest)
+			continue
+		}
+
+		switch desc.MediaType {
+		case types.OCIImageIndex, types.DockerManifestList:
+			ii, err := ii.ImageIndex(desc.Digest)
+			if err != nil {
+				return err
+			}
+
+			if err := WriteIndex(ref, ii, auth, t); err != nil {
+				return err
+			}
+		case types.OCIManifestSchema1, types.DockerManifestSchema2:
+			img, err := ii.Image(desc.Digest)
+			if err != nil {
+				return err
+			}
+			if err := Write(ref, img, auth, t); err != nil {
+				return err
+			}
+		}
+	}
+
+	// With all of the constituent elements uploaded, upload the manifest
+	// to commit the image.
+	return w.commitImage(ii)
+}

vendor/github.com/google/go-containerregistry/pkg/v1/stream/layer.go

@@ -0,0 +1,194 @@
+// 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 stream
+
+import (
+	"compress/gzip"
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"hash"
+	"io"
+	"sync"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+var (
+	// ErrNotComputed is returned when the requested value is not yet
+	// computed because the stream has not been consumed yet.
+	ErrNotComputed = errors.New("value not computed until stream is consumed")
+
+	// ErrConsumed is returned by Compressed when the underlying stream has
+	// already been consumed and closed.
+	ErrConsumed = errors.New("stream was already consumed")
+)
+
+// Layer is a streaming implementation of v1.Layer.
+type Layer struct {
+	blob     io.ReadCloser
+	consumed bool
+
+	mu             sync.Mutex
+	digest, diffID *v1.Hash
+	size           int64
+}
+
+var _ v1.Layer = (*Layer)(nil)
+
+// NewLayer creates a Layer from an io.ReadCloser.
+func NewLayer(rc io.ReadCloser) *Layer { return &Layer{blob: rc} }
+
+// Digest implements v1.Layer.
+func (l *Layer) Digest() (v1.Hash, error) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if l.digest == nil {
+		return v1.Hash{}, ErrNotComputed
+	}
+	return *l.digest, nil
+}
+
+// DiffID implements v1.Layer.
+func (l *Layer) DiffID() (v1.Hash, error) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if l.diffID == nil {
+		return v1.Hash{}, ErrNotComputed
+	}
+	return *l.diffID, nil
+}
+
+// Size implements v1.Layer.
+func (l *Layer) Size() (int64, error) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if l.size == 0 {
+		return 0, ErrNotComputed
+	}
+	return l.size, nil
+}
+
+// Uncompressed implements v1.Layer.
+func (l *Layer) Uncompressed() (io.ReadCloser, error) {
+	return nil, errors.New("NYI: stream.Layer.Uncompressed is not implemented")
+}
+
+// Compressed implements v1.Layer.
+func (l *Layer) Compressed() (io.ReadCloser, error) {
+	if l.consumed {
+		return nil, ErrConsumed
+	}
+	return newCompressedReader(l)
+}
+
+type compressedReader struct {
+	closer io.Closer // original blob's Closer.
+
+	h, zh hash.Hash // collects digests of compressed and uncompressed stream.
+	pr    io.Reader
+	count *countWriter
+
+	l *Layer // stream.Layer to update upon Close.
+}
+
+func newCompressedReader(l *Layer) (*compressedReader, error) {
+	h := sha256.New()
+	zh := sha256.New()
+	count := &countWriter{}
+
+	// gzip.Writer writes to the output stream via pipe, a hasher to
+	// capture compressed digest, and a countWriter to capture compressed
+	// size.
+	pr, pw := io.Pipe()
+	zw, err := gzip.NewWriterLevel(io.MultiWriter(pw, zh, count), gzip.BestSpeed)
+	if err != nil {
+		return nil, err
+	}
+
+	cr := &compressedReader{
+		closer: newMultiCloser(zw, l.blob),
+		pr:     pr,
+		h:      h,
+		zh:     zh,
+		count:  count,
+		l:      l,
+	}
+	go func() {
+		if _, err := io.Copy(io.MultiWriter(h, zw), l.blob); err != nil {
+			pw.CloseWithError(err)
+			return
+		}
+		// Now close the compressed reader, to flush the gzip stream
+		// and calculate digest/diffID/size. This will cause pr to
+		// return EOF which will cause readers of the Compressed stream
+		// to finish reading.
+		pw.CloseWithError(cr.Close())
+	}()
+
+	return cr, nil
+}
+
+func (cr *compressedReader) Read(b []byte) (int, error) { return cr.pr.Read(b) }
+
+func (cr *compressedReader) Close() error {
+	cr.l.mu.Lock()
+	defer cr.l.mu.Unlock()
+
+	// Close the inner ReadCloser.
+	if err := cr.closer.Close(); err != nil {
+		return err
+	}
+
+	diffID, err := v1.NewHash("sha256:" + hex.EncodeToString(cr.h.Sum(nil)))
+	if err != nil {
+		return err
+	}
+	cr.l.diffID = &diffID
+
+	digest, err := v1.NewHash("sha256:" + hex.EncodeToString(cr.zh.Sum(nil)))
+	if err != nil {
+		return err
+	}
+	cr.l.digest = &digest
+
+	cr.l.size = cr.count.n
+	cr.l.consumed = true
+	return nil
+}
+
+// countWriter counts bytes written to it.
+type countWriter struct{ n int64 }
+
+func (c *countWriter) Write(p []byte) (int, error) {
+	c.n += int64(len(p))
+	return len(p), nil
+}
+
+// multiCloser is a Closer that collects multiple Closers and Closes them in order.
+type multiCloser []io.Closer
+
+var _ io.Closer = (multiCloser)(nil)
+
+func newMultiCloser(c ...io.Closer) multiCloser { return multiCloser(c) }
+
+func (m multiCloser) Close() error {
+	for _, c := range m {
+		if err := c.Close(); err != nil {
+			return err
+		}
+	}
+	return nil
+}

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

@@ -26,7 +26,7 @@ import (
 	"sync"
 
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/partial"
 	"github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
@@ -54,6 +54,7 @@ type compressedImage struct {
 var _ partial.UncompressedImageCore = (*uncompressedImage)(nil)
 var _ partial.CompressedImageCore = (*compressedImage)(nil)
 
+// Opener is a thunk for opening a tar file.
 type Opener func() (io.ReadCloser, error)
 
 func pathOpener(path string) Opener {
@@ -62,6 +63,7 @@ func pathOpener(path string) Opener {
 	}
 }
 
+// ImageFromPath returns a v1.Image from a tarball located on path.
 func ImageFromPath(path string, tag *name.Tag) (v1.Image, error) {
 	return Image(pathOpener(path), tag)
 }

vendor/github.com/google/go-containerregistry/pkg/v1/tarball/layer.go

@@ -20,7 +20,7 @@ import (
 	"io/ioutil"
 	"os"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
 )
 

vendor/github.com/google/go-containerregistry/pkg/v1/tarball/write.go

@@ -23,36 +23,46 @@ import (
 	"os"
 
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 )
 
 // WriteToFile writes in the compressed format to a tarball, on disk.
 // This is just syntactic sugar wrapping tarball.Write with a new file.
-func WriteToFile(p string, tag name.Tag, img v1.Image) error {
+func WriteToFile(p string, ref name.Reference, img v1.Image) error {
 	w, err := os.Create(p)
 	if err != nil {
 		return err
 	}
 	defer w.Close()
 
-	return Write(tag, img, w)
+	return Write(ref, img, w)
 }
 
 // MultiWriteToFile writes in the compressed format to a tarball, on disk.
 // This is just syntactic sugar wrapping tarball.MultiWrite with a new file.
 func MultiWriteToFile(p string, tagToImage map[name.Tag]v1.Image) error {
+	var refToImage map[name.Reference]v1.Image = make(map[name.Reference]v1.Image, len(tagToImage))
+	for i, d := range tagToImage {
+		refToImage[i] = d
+	}
+	return MultiRefWriteToFile(p, refToImage)
+}
+
+// MultiRefWriteToFile writes in the compressed format to a tarball, on disk.
+// This is just syntactic sugar wrapping tarball.MultiRefWrite with a new file.
+func MultiRefWriteToFile(p string, refToImage map[name.Reference]v1.Image) error {
 	w, err := os.Create(p)
 	if err != nil {
 		return err
 	}
 	defer w.Close()
 
-	return MultiWrite(tagToImage, w)
+	return MultiRefWrite(refToImage, w)
 }
 
 // Write is a wrapper to write a single image and tag to a tarball.
-func Write(tag name.Tag, img v1.Image, w io.Writer) error {
-	return MultiWrite(map[name.Tag]v1.Image{tag: img}, w)
+func Write(ref name.Reference, img v1.Image, w io.Writer) error {
+	return MultiRefWrite(map[name.Reference]v1.Image{ref: img}, w)
 }
 
 // MultiWrite writes the contents of each image to the provided reader, in the compressed format.
@@ -61,10 +71,23 @@ func Write(tag name.Tag, img v1.Image, w io.Writer) error {
 // One file for each layer, named after the layer's SHA.
 // One file for the config blob, named after its SHA.
 func MultiWrite(tagToImage map[name.Tag]v1.Image, w io.Writer) error {
+	var refToImage map[name.Reference]v1.Image = make(map[name.Reference]v1.Image, len(tagToImage))
+	for i, d := range tagToImage {
+		refToImage[i] = d
+	}
+	return MultiRefWrite(refToImage, w)
+}
+
+// MultiRefWrite writes the contents of each image to the provided reader, in the compressed format.
+// The contents are written in the following format:
+// One manifest.json file at the top level containing information about several images.
+// One file for each layer, named after the layer's SHA.
+// One file for the config blob, named after its SHA.
+func MultiRefWrite(refToImage map[name.Reference]v1.Image, w io.Writer) error {
 	tf := tar.NewWriter(w)
 	defer tf.Close()
 
-	imageToTags := dedupTagToImage(tagToImage)
+	imageToTags := dedupRefToImage(refToImage)
 	var td tarDescriptor
 
 	for img, tags := range imageToTags {
@@ -135,14 +158,20 @@ func MultiWrite(tagToImage map[name.Tag]v1.Image, w io.Writer) error {
 	return writeTarEntry(tf, "manifest.json", bytes.NewReader(tdBytes), int64(len(tdBytes)))
 }
 
-func dedupTagToImage(tagToImage map[name.Tag]v1.Image) map[v1.Image][]string {
+func dedupRefToImage(refToImage map[name.Reference]v1.Image) map[v1.Image][]string {
 	imageToTags := make(map[v1.Image][]string)
 
-	for tag, img := range tagToImage {
-		if tags, ok := imageToTags[img]; ok {
-			imageToTags[img] = append(tags, tag.String())
+	for ref, img := range refToImage {
+		if tag, ok := ref.(name.Tag); ok {
+			if tags, ok := imageToTags[img]; ok && tags != nil {
+				imageToTags[img] = append(tags, tag.String())
+			} else {
+				imageToTags[img] = []string{tag.String()}
+			}
 		} else {
-			imageToTags[img] = []string{tag.String()}
+			if _, ok := imageToTags[img]; !ok {
+				imageToTags[img] = nil
+			}
 		}
 	}
 

vendor/github.com/google/go-containerregistry/pkg/v1/v1util/nop.go

@@ -1,40 +0,0 @@
-// 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 v1util
-
-import (
-	"io"
-)
-
-func nop() error {
-	return nil
-}
-
-// NopWriteCloser wraps the io.Writer as an io.WriteCloser with a Close() method that does nothing.
-func NopWriteCloser(w io.Writer) io.WriteCloser {
-	return &writeAndCloser{
-		Writer:    w,
-		CloseFunc: nop,
-	}
-}
-
-// NopReadCloser wraps the io.Reader as an io.ReadCloser with a Close() method that does nothing.
-// This is technically redundant with ioutil.NopCloser, but provided for symmetry and clarity.
-func NopReadCloser(r io.Reader) io.ReadCloser {
-	return &readAndCloser{
-		Reader:    r,
-		CloseFunc: nop,
-	}
-}

vendor/github.com/google/go-containerregistry/pkg/v1/v1util/verify.go

@@ -20,7 +20,7 @@ import (
 	"hash"
 	"io"
 
-	"github.com/google/go-containerregistry/pkg/v1"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 )
 
 type verifyReader struct {

vendor/github.com/google/go-containerregistry/pkg/v1/v1util/zip.go

@@ -70,56 +70,14 @@ func GunzipReadCloser(r io.ReadCloser) (io.ReadCloser, error) {
 	}, nil
 }
 
-// GzipWriteCloser returns an io.WriteCloser to which uncompressed data may be
-// written, and the compressed data is then written to the provided
-// io.WriteCloser.
-func GzipWriteCloser(w io.WriteCloser) io.WriteCloser {
-	gw := gzip.NewWriter(w)
-	return &writeAndCloser{
-		Writer: gw,
-		CloseFunc: func() error {
-			if err := gw.Close(); err != nil {
-				return err
-			}
-			return w.Close()
-		},
-	}
-}
-
-// gunzipWriteCloser implements io.WriteCloser
-// It is used to implement GunzipWriteClose.
-type gunzipWriteCloser struct {
-	*bytes.Buffer
-	writer io.WriteCloser
-}
-
-// Close implements io.WriteCloser
-func (gwc *gunzipWriteCloser) Close() error {
-	// TODO(mattmoor): How to avoid buffering this whole thing into memory?
-	gr, err := gzip.NewReader(gwc.Buffer)
-	if err != nil {
-		return err
-	}
-	if _, err := io.Copy(gwc.writer, gr); err != nil {
-		return err
-	}
-	return gwc.writer.Close()
-}
-
-// GunzipWriteCloser returns an io.WriteCloser to which compressed data may be
-// written, and the uncompressed data is then written to the provided
-// io.WriteCloser.
-func GunzipWriteCloser(w io.WriteCloser) (io.WriteCloser, error) {
-	return &gunzipWriteCloser{
-		Buffer: bytes.NewBuffer(nil),
-		writer: w,
-	}, nil
-}
-
 // IsGzipped detects whether the input stream is compressed.
 func IsGzipped(r io.Reader) (bool, error) {
 	magicHeader := make([]byte, 2)
-	if _, err := r.Read(magicHeader); err != nil {
+	n, err := r.Read(magicHeader)
+	if n == 0 && err == io.EOF {
+		return false, nil
+	}
+	if err != nil {
 		return false, err
 	}
 	return bytes.Equal(magicHeader, gzipMagicHeader), nil

vendor/github.com/otiai10/copy/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 otiai10
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/github.com/otiai10/copy/copy.go

@@ -0,0 +1,93 @@
+package copy
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+// Copy copies src to dest, doesn't matter if src is a directory or a file
+func Copy(src, dest string) error {
+	info, err := os.Lstat(src)
+	if err != nil {
+		return err
+	}
+	return copy(src, dest, info)
+}
+
+// copy dispatches copy-funcs according to the mode.
+// Because this "copy" could be called recursively,
+// "info" MUST be given here, NOT nil.
+func copy(src, dest string, info os.FileInfo) error {
+	if info.Mode()&os.ModeSymlink != 0 {
+		return lcopy(src, dest, info)
+	}
+	if info.IsDir() {
+		return dcopy(src, dest, info)
+	}
+	return fcopy(src, dest, info)
+}
+
+// fcopy is for just a file,
+// with considering existence of parent directory
+// and file permission.
+func fcopy(src, dest string, info os.FileInfo) error {
+
+	if err := os.MkdirAll(filepath.Dir(dest), os.ModePerm); err != nil {
+		return err
+	}
+
+	f, err := os.Create(dest)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if err = os.Chmod(f.Name(), info.Mode()); err != nil {
+		return err
+	}
+
+	s, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	_, err = io.Copy(f, s)
+	return err
+}
+
+// dcopy is for a directory,
+// with scanning contents inside the directory
+// and pass everything to "copy" recursively.
+func dcopy(srcdir, destdir string, info os.FileInfo) error {
+
+	if err := os.MkdirAll(destdir, info.Mode()); err != nil {
+		return err
+	}
+
+	contents, err := ioutil.ReadDir(srcdir)
+	if err != nil {
+		return err
+	}
+
+	for _, content := range contents {
+		cs, cd := filepath.Join(srcdir, content.Name()), filepath.Join(destdir, content.Name())
+		if err := copy(cs, cd, content); err != nil {
+			// If any error, exit immediately
+			return err
+		}
+	}
+	return nil
+}
+
+// lcopy is for a symlink,
+// with just creating a new symlink by replicating src symlink.
+func lcopy(src, dest string, info os.FileInfo) error {
+	src, err := os.Readlink(src)
+	if err != nil {
+		return err
+	}
+	return os.Symlink(src, dest)
+}

vendor/github.com/otiai10/copy/testdata/case03/case01

@@ -0,0 +1 @@
+./testdata/case01