Merge pull request #29339 from dmcgowan/plugins-abstract-download-manager

Abstract layerstore from pull/push distribution code

cli/command/image/pull.go

@@ -74,7 +74,7 @@ func runPull(dockerCli *command.DockerCli, opts pullOptions) error {
 		err = imagePullPrivileged(ctx, dockerCli, authConfig, distributionRef.String(), requestPrivilege, opts.all)
 	}
 	if err != nil {
-		if strings.Contains(err.Error(), "target is a plugin") {
+		if strings.Contains(err.Error(), "target is plugin") {
 			return errors.New(err.Error() + " - Use `docker plugin install`")
 		}
 		return err

daemon/image_pull.go

@@ -89,15 +89,18 @@ func (daemon *Daemon) pullImageWithReference(ctx context.Context, ref reference.
 	}()
 
 	imagePullConfig := &distribution.ImagePullConfig{
-		MetaHeaders:      metaHeaders,
-		AuthConfig:       authConfig,
-		ProgressOutput:   progress.ChanOutput(progressChan),
-		RegistryService:  daemon.RegistryService,
-		ImageEventLogger: daemon.LogImageEvent,
-		MetadataStore:    daemon.distributionMetadataStore,
-		ImageStore:       daemon.imageStore,
-		ReferenceStore:   daemon.referenceStore,
-		DownloadManager:  daemon.downloadManager,
+		Config: distribution.Config{
+			MetaHeaders:      metaHeaders,
+			AuthConfig:       authConfig,
+			ProgressOutput:   progress.ChanOutput(progressChan),
+			RegistryService:  daemon.RegistryService,
+			ImageEventLogger: daemon.LogImageEvent,
+			MetadataStore:    daemon.distributionMetadataStore,
+			ImageStore:       distribution.NewImageConfigStoreFromStore(daemon.imageStore),
+			ReferenceStore:   daemon.referenceStore,
+		},
+		DownloadManager: daemon.downloadManager,
+		Schema2Types:    distribution.ImageTypes,
 	}
 
 	err := distribution.Pull(ctx, ref, imagePullConfig)

daemon/image_push.go

@@ -3,6 +3,7 @@ package daemon
 import (
 	"io"
 
+	"github.com/docker/distribution/manifest/schema2"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/distribution"
 	"github.com/docker/docker/pkg/progress"
@@ -38,17 +39,20 @@ func (daemon *Daemon) PushImage(ctx context.Context, image, tag string, metaHead
 	}()
 
 	imagePushConfig := &distribution.ImagePushConfig{
-		MetaHeaders:      metaHeaders,
-		AuthConfig:       authConfig,
-		ProgressOutput:   progress.ChanOutput(progressChan),
-		RegistryService:  daemon.RegistryService,
-		ImageEventLogger: daemon.LogImageEvent,
-		MetadataStore:    daemon.distributionMetadataStore,
-		LayerStore:       daemon.layerStore,
-		ImageStore:       daemon.imageStore,
-		ReferenceStore:   daemon.referenceStore,
-		TrustKey:         daemon.trustKey,
-		UploadManager:    daemon.uploadManager,
+		Config: distribution.Config{
+			MetaHeaders:      metaHeaders,
+			AuthConfig:       authConfig,
+			ProgressOutput:   progress.ChanOutput(progressChan),
+			RegistryService:  daemon.RegistryService,
+			ImageEventLogger: daemon.LogImageEvent,
+			MetadataStore:    daemon.distributionMetadataStore,
+			ImageStore:       distribution.NewImageConfigStoreFromStore(daemon.imageStore),
+			ReferenceStore:   daemon.referenceStore,
+		},
+		ConfigMediaType: schema2.MediaTypeImageConfig,
+		LayerStore:      distribution.NewLayerProviderFromStore(daemon.layerStore),
+		TrustKey:        daemon.trustKey,
+		UploadManager:   daemon.uploadManager,
 	}
 
 	err = distribution.Push(ctx, ref, imagePushConfig)

distribution/config.go

@@ -0,0 +1,233 @@
+package distribution
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"runtime"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/digest"
+	"github.com/docker/distribution/manifest/schema2"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/distribution/metadata"
+	"github.com/docker/docker/distribution/xfer"
+	"github.com/docker/docker/image"
+	"github.com/docker/docker/layer"
+	"github.com/docker/docker/pkg/progress"
+	"github.com/docker/docker/reference"
+	"github.com/docker/docker/registry"
+	"github.com/docker/libtrust"
+	"golang.org/x/net/context"
+)
+
+// Config stores configuration for communicating
+// with a registry.
+type Config struct {
+	// MetaHeaders stores HTTP headers with metadata about the image
+	MetaHeaders map[string][]string
+	// AuthConfig holds authentication credentials for authenticating with
+	// the registry.
+	AuthConfig *types.AuthConfig
+	// ProgressOutput is the interface for showing the status of the pull
+	// operation.
+	ProgressOutput progress.Output
+	// RegistryService is the registry service to use for TLS configuration
+	// and endpoint lookup.
+	RegistryService registry.Service
+	// ImageEventLogger notifies events for a given image
+	ImageEventLogger func(id, name, action string)
+	// MetadataStore is the storage backend for distribution-specific
+	// metadata.
+	MetadataStore metadata.Store
+	// ImageStore manages images.
+	ImageStore ImageConfigStore
+	// ReferenceStore manages tags. This value is optional, when excluded
+	// content will not be tagged.
+	ReferenceStore reference.Store
+	// RequireSchema2 ensures that only schema2 manifests are used.
+	RequireSchema2 bool
+}
+
+// ImagePullConfig stores pull configuration.
+type ImagePullConfig struct {
+	Config
+
+	// DownloadManager manages concurrent pulls.
+	DownloadManager RootFSDownloadManager
+	// Schema2Types is the valid schema2 configuration types allowed
+	// by the pull operation.
+	Schema2Types []string
+}
+
+// ImagePushConfig stores push configuration.
+type ImagePushConfig struct {
+	Config
+
+	// ConfigMediaType is the configuration media type for
+	// schema2 manifests.
+	ConfigMediaType string
+	// LayerStore manages layers.
+	LayerStore PushLayerProvider
+	// TrustKey is the private key for legacy signatures. This is typically
+	// an ephemeral key, since these signatures are no longer verified.
+	TrustKey libtrust.PrivateKey
+	// UploadManager dispatches uploads.
+	UploadManager *xfer.LayerUploadManager
+}
+
+// ImageConfigStore handles storing and getting image configurations
+// by digest. Allows getting an image configurations rootfs from the
+// configuration.
+type ImageConfigStore interface {
+	Put([]byte) (digest.Digest, error)
+	Get(digest.Digest) ([]byte, error)
+	RootFSFromConfig([]byte) (*image.RootFS, error)
+}
+
+// PushLayerProvider provides layers to be pushed by ChainID.
+type PushLayerProvider interface {
+	Get(layer.ChainID) (PushLayer, error)
+}
+
+// PushLayer is a pushable layer with metadata about the layer
+// and access to the content of the layer.
+type PushLayer interface {
+	ChainID() layer.ChainID
+	DiffID() layer.DiffID
+	Parent() PushLayer
+	Open() (io.ReadCloser, error)
+	Size() (int64, error)
+	MediaType() string
+	Release()
+}
+
+// RootFSDownloadManager handles downloading of the rootfs
+type RootFSDownloadManager interface {
+	// Download downloads the layers into the given initial rootfs and
+	// returns the final rootfs.
+	// Given progress output to track download progress
+	// Returns function to release download resources
+	Download(ctx context.Context, initialRootFS image.RootFS, layers []xfer.DownloadDescriptor, progressOutput progress.Output) (image.RootFS, func(), error)
+}
+
+type imageConfigStore struct {
+	image.Store
+}
+
+// NewImageConfigStoreFromStore returns an ImageConfigStore backed
+// by an image.Store for container images.
+func NewImageConfigStoreFromStore(is image.Store) ImageConfigStore {
+	return &imageConfigStore{
+		Store: is,
+	}
+}
+
+func (s *imageConfigStore) Put(c []byte) (digest.Digest, error) {
+	id, err := s.Store.Create(c)
+	return digest.Digest(id), err
+}
+
+func (s *imageConfigStore) Get(d digest.Digest) ([]byte, error) {
+	img, err := s.Store.Get(image.IDFromDigest(d))
+	if err != nil {
+		return nil, err
+	}
+	return img.RawJSON(), nil
+}
+
+func (s *imageConfigStore) RootFSFromConfig(c []byte) (*image.RootFS, error) {
+	var unmarshalledConfig image.Image
+	if err := json.Unmarshal(c, &unmarshalledConfig); err != nil {
+		return nil, err
+	}
+
+	// fail immediately on windows
+	if runtime.GOOS == "windows" && unmarshalledConfig.OS == "linux" {
+		return nil, fmt.Errorf("image operating system %q cannot be used on this platform", unmarshalledConfig.OS)
+	}
+
+	return unmarshalledConfig.RootFS, nil
+}
+
+type storeLayerProvider struct {
+	ls layer.Store
+}
+
+// NewLayerProviderFromStore returns a layer provider backed by
+// an instance of LayerStore. Only getting layers as gzipped
+// tars is supported.
+func NewLayerProviderFromStore(ls layer.Store) PushLayerProvider {
+	return &storeLayerProvider{
+		ls: ls,
+	}
+}
+
+func (p *storeLayerProvider) Get(lid layer.ChainID) (PushLayer, error) {
+	if lid == "" {
+		return &storeLayer{
+			Layer: layer.EmptyLayer,
+		}, nil
+	}
+	l, err := p.ls.Get(lid)
+	if err != nil {
+		return nil, err
+	}
+
+	sl := storeLayer{
+		Layer: l,
+		ls:    p.ls,
+	}
+	if d, ok := l.(distribution.Describable); ok {
+		return &describableStoreLayer{
+			storeLayer:  sl,
+			describable: d,
+		}, nil
+	}
+
+	return &sl, nil
+}
+
+type storeLayer struct {
+	layer.Layer
+	ls layer.Store
+}
+
+func (l *storeLayer) Parent() PushLayer {
+	p := l.Layer.Parent()
+	if p == nil {
+		return nil
+	}
+	return &storeLayer{
+		Layer: p,
+		ls:    l.ls,
+	}
+}
+
+func (l *storeLayer) Open() (io.ReadCloser, error) {
+	return l.Layer.TarStream()
+}
+
+func (l *storeLayer) Size() (int64, error) {
+	return l.Layer.DiffSize()
+}
+
+func (l *storeLayer) MediaType() string {
+	// layer store always returns uncompressed tars
+	return schema2.MediaTypeUncompressedLayer
+}
+
+func (l *storeLayer) Release() {
+	if l.ls != nil {
+		layer.ReleaseAndLog(l.ls, l.Layer)
+	}
+}
+
+type describableStoreLayer struct {
+	storeLayer
+	describable distribution.Describable
+}
+
+func (l *describableStoreLayer) Descriptor() distribution.Descriptor {
+	return l.describable.Descriptor()
+}

distribution/pull.go

@@ -6,42 +6,13 @@ import (
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/distribution/digest"
 	"github.com/docker/docker/api"
-	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/distribution/metadata"
-	"github.com/docker/docker/distribution/xfer"
-	"github.com/docker/docker/image"
 	"github.com/docker/docker/pkg/progress"
 	"github.com/docker/docker/reference"
 	"github.com/docker/docker/registry"
 	"golang.org/x/net/context"
 )
 
-// ImagePullConfig stores pull configuration.
-type ImagePullConfig struct {
-	// MetaHeaders stores HTTP headers with metadata about the image
-	MetaHeaders map[string][]string
-	// AuthConfig holds authentication credentials for authenticating with
-	// the registry.
-	AuthConfig *types.AuthConfig
-	// ProgressOutput is the interface for showing the status of the pull
-	// operation.
-	ProgressOutput progress.Output
-	// RegistryService is the registry service to use for TLS configuration
-	// and endpoint lookup.
-	RegistryService registry.Service
-	// ImageEventLogger notifies events for a given image
-	ImageEventLogger func(id, name, action string)
-	// MetadataStore is the storage backend for distribution-specific
-	// metadata.
-	MetadataStore metadata.Store
-	// ImageStore manages images.
-	ImageStore image.Store
-	// ReferenceStore manages tags.
-	ReferenceStore reference.Store
-	// DownloadManager manages concurrent pulls.
-	DownloadManager *xfer.LayerDownloadManager
-}
-
 // Puller is an interface that abstracts pulling for different API versions.
 type Puller interface {
 	// Pull tries to pull the image referenced by `tag`
@@ -117,6 +88,10 @@ func Pull(ctx context.Context, ref reference.Named, imagePullConfig *ImagePullCo
 		confirmedTLSRegistries = make(map[string]struct{})
 	)
 	for _, endpoint := range endpoints {
+		if imagePullConfig.RequireSchema2 && endpoint.Version == registry.APIVersion1 {
+			continue
+		}
+
 		if confirmedV2 && endpoint.Version == registry.APIVersion1 {
 			logrus.Debugf("Skipping v1 endpoint %s because v2 registry was detected", endpoint.URL)
 			continue

distribution/pull_v1.go

@@ -243,13 +243,15 @@ func (p *v1Puller) pullImage(ctx context.Context, v1ID, endpoint string, localNa
 		return err
 	}
 
-	imageID, err := p.config.ImageStore.Create(config)
+	imageID, err := p.config.ImageStore.Put(config)
 	if err != nil {
 		return err
 	}
 
-	if err := p.config.ReferenceStore.AddTag(localNameRef, imageID.Digest(), true); err != nil {
-		return err
+	if p.config.ReferenceStore != nil {
+		if err := p.config.ReferenceStore.AddTag(localNameRef, imageID, true); err != nil {
+			return err
+		}
 	}
 
 	return nil

distribution/pull_v2.go

@@ -33,9 +33,8 @@ import (
 )
 
 var (
-	errRootFSMismatch  = errors.New("layers from manifest don't match image configuration")
-	errMediaTypePlugin = errors.New("target is a plugin")
-	errRootFSInvalid   = errors.New("invalid rootfs in image configuration")
+	errRootFSMismatch = errors.New("layers from manifest don't match image configuration")
+	errRootFSInvalid  = errors.New("invalid rootfs in image configuration")
 )
 
 // ImageConfigPullError is an error pulling the image config blob
@@ -355,8 +354,19 @@ func (p *v2Puller) pullV2Tag(ctx context.Context, ref reference.Named) (tagUpdat
 	}
 
 	if m, ok := manifest.(*schema2.DeserializedManifest); ok {
-		if m.Manifest.Config.MediaType == schema2.MediaTypePluginConfig {
-			return false, errMediaTypePlugin
+		var allowedMediatype bool
+		for _, t := range p.config.Schema2Types {
+			if m.Manifest.Config.MediaType == t {
+				allowedMediatype = true
+				break
+			}
+		}
+		if !allowedMediatype {
+			configClass := mediaTypeClasses[m.Manifest.Config.MediaType]
+			if configClass == "" {
+				configClass = "unknown"
+			}
+			return false, fmt.Errorf("target is %s", configClass)
 		}
 	}
 
@@ -374,6 +384,9 @@ func (p *v2Puller) pullV2Tag(ctx context.Context, ref reference.Named) (tagUpdat
 
 	switch v := manifest.(type) {
 	case *schema1.SignedManifest:
+		if p.config.RequireSchema2 {
+			return false, fmt.Errorf("invalid manifest: not schema2")
+		}
 		id, manifestDigest, err = p.pullSchema1(ctx, ref, v)
 		if err != nil {
 			return false, err
@@ -394,25 +407,27 @@ func (p *v2Puller) pullV2Tag(ctx context.Context, ref reference.Named) (tagUpdat
 
 	progress.Message(p.config.ProgressOutput, "", "Digest: "+manifestDigest.String())
 
-	oldTagID, err := p.config.ReferenceStore.Get(ref)
-	if err == nil {
-		if oldTagID == id {
-			return false, addDigestReference(p.config.ReferenceStore, ref, manifestDigest, id)
-		}
-	} else if err != reference.ErrDoesNotExist {
-		return false, err
-	}
-
-	if canonical, ok := ref.(reference.Canonical); ok {
-		if err = p.config.ReferenceStore.AddDigest(canonical, id, true); err != nil {
-			return false, err
-		}
-	} else {
-		if err = addDigestReference(p.config.ReferenceStore, ref, manifestDigest, id); err != nil {
+	if p.config.ReferenceStore != nil {
+		oldTagID, err := p.config.ReferenceStore.Get(ref)
+		if err == nil {
+			if oldTagID == id {
+				return false, addDigestReference(p.config.ReferenceStore, ref, manifestDigest, id)
+			}
+		} else if err != reference.ErrDoesNotExist {
 			return false, err
 		}
-		if err = p.config.ReferenceStore.AddTag(ref, id, true); err != nil {
-			return false, err
+
+		if canonical, ok := ref.(reference.Canonical); ok {
+			if err = p.config.ReferenceStore.AddDigest(canonical, id, true); err != nil {
+				return false, err
+			}
+		} else {
+			if err = addDigestReference(p.config.ReferenceStore, ref, manifestDigest, id); err != nil {
+				return false, err
+			}
+			if err = p.config.ReferenceStore.AddTag(ref, id, true); err != nil {
+				return false, err
+			}
 		}
 	}
 	return true, nil
@@ -481,14 +496,14 @@ func (p *v2Puller) pullSchema1(ctx context.Context, ref reference.Named, unverif
 		return "", "", err
 	}
 
-	imageID, err := p.config.ImageStore.Create(config)
+	imageID, err := p.config.ImageStore.Put(config)
 	if err != nil {
 		return "", "", err
 	}
 
 	manifestDigest = digest.FromBytes(unverifiedManifest.Canonical)
 
-	return imageID.Digest(), manifestDigest, nil
+	return imageID, manifestDigest, nil
 }
 
 func (p *v2Puller) pullSchema2(ctx context.Context, ref reference.Named, mfst *schema2.DeserializedManifest) (id digest.Digest, manifestDigest digest.Digest, err error) {
@@ -498,7 +513,7 @@ func (p *v2Puller) pullSchema2(ctx context.Context, ref reference.Named, mfst *s
 	}
 
 	target := mfst.Target()
-	if _, err := p.config.ImageStore.Get(image.IDFromDigest(target.Digest)); err == nil {
+	if _, err := p.config.ImageStore.Get(target.Digest); err == nil {
 		// If the image already exists locally, no need to pull
 		// anything.
 		return target.Digest, manifestDigest, nil
@@ -537,9 +552,9 @@ func (p *v2Puller) pullSchema2(ctx context.Context, ref reference.Named, mfst *s
 	}()
 
 	var (
-		configJSON         []byte       // raw serialized image config
-		unmarshalledConfig image.Image  // deserialized image config
-		downloadRootFS     image.RootFS // rootFS to use for registering layers.
+		configJSON       []byte        // raw serialized image config
+		downloadedRootFS *image.RootFS // rootFS from registered layers
+		configRootFS     *image.RootFS // rootFS from configuration
 	)
 
 	// https://github.com/docker/docker/issues/24766 - Err on the side of caution,
@@ -551,84 +566,87 @@ func (p *v2Puller) pullSchema2(ctx context.Context, ref reference.Named, mfst *s
 	// check to block Windows images being pulled on Linux is implemented, it
 	// may be necessary to perform the same type of serialisation.
 	if runtime.GOOS == "windows" {
-		configJSON, unmarshalledConfig, err = receiveConfig(configChan, errChan)
+		configJSON, configRootFS, err = receiveConfig(p.config.ImageStore, configChan, errChan)
 		if err != nil {
 			return "", "", err
 		}
 
-		if unmarshalledConfig.RootFS == nil {
+		if configRootFS == nil {
 			return "", "", errRootFSInvalid
 		}
-
-		if unmarshalledConfig.OS == "linux" {
-			return "", "", fmt.Errorf("image operating system %q cannot be used on this platform", unmarshalledConfig.OS)
-		}
 	}
 
-	downloadRootFS = *image.NewRootFS()
-
-	rootFS, release, err := p.config.DownloadManager.Download(ctx, downloadRootFS, descriptors, p.config.ProgressOutput)
-	if err != nil {
-		if configJSON != nil {
-			// Already received the config
-			return "", "", err
-		}
-		select {
-		case err = <-errChan:
-			return "", "", err
-		default:
-			cancel()
+	if p.config.DownloadManager != nil {
+		downloadRootFS := *image.NewRootFS()
+		rootFS, release, err := p.config.DownloadManager.Download(ctx, downloadRootFS, descriptors, p.config.ProgressOutput)
+		if err != nil {
+			if configJSON != nil {
+				// Already received the config
+				return "", "", err
+			}
 			select {
-			case <-configChan:
-			case <-errChan:
+			case err = <-errChan:
+				return "", "", err
+			default:
+				cancel()
+				select {
+				case <-configChan:
+				case <-errChan:
+				}
+				return "", "", err
 			}
-			return "", "", err
 		}
+		if release != nil {
+			defer release()
+		}
+
+		downloadedRootFS = &rootFS
 	}
-	defer release()
 
 	if configJSON == nil {
-		configJSON, unmarshalledConfig, err = receiveConfig(configChan, errChan)
+		configJSON, configRootFS, err = receiveConfig(p.config.ImageStore, configChan, errChan)
 		if err != nil {
 			return "", "", err
 		}
 
-		if unmarshalledConfig.RootFS == nil {
+		if configRootFS == nil {
 			return "", "", errRootFSInvalid
 		}
 	}
 
-	// The DiffIDs returned in rootFS MUST match those in the config.
-	// Otherwise the image config could be referencing layers that aren't
-	// included in the manifest.
-	if len(rootFS.DiffIDs) != len(unmarshalledConfig.RootFS.DiffIDs) {
-		return "", "", errRootFSMismatch
-	}
-
-	for i := range rootFS.DiffIDs {
-		if rootFS.DiffIDs[i] != unmarshalledConfig.RootFS.DiffIDs[i] {
+	if downloadedRootFS != nil {
+		// The DiffIDs returned in rootFS MUST match those in the config.
+		// Otherwise the image config could be referencing layers that aren't
+		// included in the manifest.
+		if len(downloadedRootFS.DiffIDs) != len(configRootFS.DiffIDs) {
 			return "", "", errRootFSMismatch
 		}
+
+		for i := range downloadedRootFS.DiffIDs {
+			if downloadedRootFS.DiffIDs[i] != configRootFS.DiffIDs[i] {
+				return "", "", errRootFSMismatch
+			}
+		}
 	}
 
-	imageID, err := p.config.ImageStore.Create(configJSON)
+	imageID, err := p.config.ImageStore.Put(configJSON)
 	if err != nil {
 		return "", "", err
 	}
 
-	return imageID.Digest(), manifestDigest, nil
+	return imageID, manifestDigest, nil
 }
 
-func receiveConfig(configChan <-chan []byte, errChan <-chan error) ([]byte, image.Image, error) {
+func receiveConfig(s ImageConfigStore, configChan <-chan []byte, errChan <-chan error) ([]byte, *image.RootFS, error) {
 	select {
 	case configJSON := <-configChan:
-		var unmarshalledConfig image.Image
-		if err := json.Unmarshal(configJSON, &unmarshalledConfig); err != nil {
-			return nil, image.Image{}, err
+		rootfs, err := s.RootFSFromConfig(configJSON)
+		if err != nil {
+			return nil, nil, err
 		}
-		return configJSON, unmarshalledConfig, nil
+		return configJSON, rootfs, nil
 	case err := <-errChan:
-		return nil, image.Image{}, err
+		return nil, nil, err
 		// Don't need a case for ctx.Done in the select because cancellation
 		// will trigger an error in p.pullSchema2ImageConfig.
 	}

distribution/push.go

@@ -7,49 +7,13 @@ import (
 	"io"
 
 	"github.com/Sirupsen/logrus"
-	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/distribution/metadata"
-	"github.com/docker/docker/distribution/xfer"
-	"github.com/docker/docker/image"
-	"github.com/docker/docker/layer"
 	"github.com/docker/docker/pkg/progress"
 	"github.com/docker/docker/reference"
 	"github.com/docker/docker/registry"
-	"github.com/docker/libtrust"
 	"golang.org/x/net/context"
 )
 
-// ImagePushConfig stores push configuration.
-type ImagePushConfig struct {
-	// MetaHeaders store HTTP headers with metadata about the image
-	MetaHeaders map[string][]string
-	// AuthConfig holds authentication credentials for authenticating with
-	// the registry.
-	AuthConfig *types.AuthConfig
-	// ProgressOutput is the interface for showing the status of the push
-	// operation.
-	ProgressOutput progress.Output
-	// RegistryService is the registry service to use for TLS configuration
-	// and endpoint lookup.
-	RegistryService registry.Service
-	// ImageEventLogger notifies events for a given image
-	ImageEventLogger func(id, name, action string)
-	// MetadataStore is the storage backend for distribution-specific
-	// metadata.
-	MetadataStore metadata.Store
-	// LayerStore manages layers.
-	LayerStore layer.Store
-	// ImageStore manages images.
-	ImageStore image.Store
-	// ReferenceStore manages tags.
-	ReferenceStore reference.Store
-	// TrustKey is the private key for legacy signatures. This is typically
-	// an ephemeral key, since these signatures are no longer verified.
-	TrustKey libtrust.PrivateKey
-	// UploadManager dispatches uploads.
-	UploadManager *xfer.LayerUploadManager
-}
-
 // Pusher is an interface that abstracts pushing for different API versions.
 type Pusher interface {
 	// Push tries to push the image configured at the creation of Pusher.
@@ -127,6 +91,9 @@ func Push(ctx context.Context, ref reference.Named, imagePushConfig *ImagePushCo
 	)
 
 	for _, endpoint := range endpoints {
+		if imagePushConfig.RequireSchema2 && endpoint.Version == registry.APIVersion1 {
+			continue
+		}
 		if confirmedV2 && endpoint.Version == registry.APIVersion1 {
 			logrus.Debugf("Skipping v1 endpoint %s because v2 registry was detected", endpoint.URL)
 			continue

distribution/push_v1.go

@@ -137,7 +137,7 @@ func newV1DependencyImage(l layer.Layer, parent *v1DependencyImage) *v1Dependenc
 }
 
 // Retrieve the all the images to be uploaded in the correct order
-func (p *v1Pusher) getImageList() (imageList []v1Image, tagsByImage map[image.ID][]string, referencedLayers []layer.Layer, err error) {
+func (p *v1Pusher) getImageList() (imageList []v1Image, tagsByImage map[image.ID][]string, referencedLayers []PushLayer, err error) {
 	tagsByImage = make(map[image.ID][]string)
 
 	// Ignore digest references
@@ -202,24 +202,30 @@ func (p *v1Pusher) getImageList() (imageList []v1Image, tagsByImage map[image.ID
 	return
 }
 
-func (p *v1Pusher) imageListForTag(imgID image.ID, dependenciesSeen map[layer.ChainID]*v1DependencyImage, referencedLayers *[]layer.Layer) (imageListForThisTag []v1Image, err error) {
-	img, err := p.config.ImageStore.Get(imgID)
+func (p *v1Pusher) imageListForTag(imgID image.ID, dependenciesSeen map[layer.ChainID]*v1DependencyImage, referencedLayers *[]PushLayer) (imageListForThisTag []v1Image, err error) {
+	ics, ok := p.config.ImageStore.(*imageConfigStore)
+	if !ok {
+		return nil, fmt.Errorf("only image store images supported for v1 push")
+	}
+	img, err := ics.Store.Get(imgID)
 	if err != nil {
 		return nil, err
 	}
 
 	topLayerID := img.RootFS.ChainID()
 
-	var l layer.Layer
-	if topLayerID == "" {
-		l = layer.EmptyLayer
-	} else {
-		l, err = p.config.LayerStore.Get(topLayerID)
-		*referencedLayers = append(*referencedLayers, l)
-		if err != nil {
-			return nil, fmt.Errorf("failed to get top layer from image: %v", err)
-		}
+	pl, err := p.config.LayerStore.Get(topLayerID)
+	*referencedLayers = append(*referencedLayers, pl)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get top layer from image: %v", err)
+	}
+
+	// V1 push is deprecated, only support existing layerstore layers
+	lsl, ok := pl.(*storeLayer)
+	if !ok {
+		return nil, fmt.Errorf("only layer store layers supported for v1 push")
 	}
+	l := lsl.Layer
 
 	dependencyImages, parent := generateDependencyImages(l.Parent(), dependenciesSeen)
 
@@ -365,7 +371,7 @@ func (p *v1Pusher) pushRepository(ctx context.Context) error {
 	imgList, tags, referencedLayers, err := p.getImageList()
 	defer func() {
 		for _, l := range referencedLayers {
-			p.config.LayerStore.Release(l)
+			l.Release()
 		}
 	}()
 	if err != nil {

distribution/push_v2.go

@@ -20,7 +20,6 @@ import (
 	"github.com/docker/distribution/registry/client"
 	"github.com/docker/docker/distribution/metadata"
 	"github.com/docker/docker/distribution/xfer"
-	"github.com/docker/docker/image"
 	"github.com/docker/docker/layer"
 	"github.com/docker/docker/pkg/ioutils"
 	"github.com/docker/docker/pkg/progress"
@@ -123,23 +122,21 @@ func (p *v2Pusher) pushV2Repository(ctx context.Context) (err error) {
 func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, id digest.Digest) error {
 	logrus.Debugf("Pushing repository: %s", ref.String())
 
-	img, err := p.config.ImageStore.Get(image.IDFromDigest(id))
+	imgConfig, err := p.config.ImageStore.Get(id)
 	if err != nil {
 		return fmt.Errorf("could not find image from tag %s: %v", ref.String(), err)
 	}
 
-	var l layer.Layer
+	rootfs, err := p.config.ImageStore.RootFSFromConfig(imgConfig)
+	if err != nil {
+		return fmt.Errorf("unable to get rootfs for image %s: %s", ref.String(), err)
+	}
 
-	topLayerID := img.RootFS.ChainID()
-	if topLayerID == "" {
-		l = layer.EmptyLayer
-	} else {
-		l, err = p.config.LayerStore.Get(topLayerID)
-		if err != nil {
-			return fmt.Errorf("failed to get top layer from image: %v", err)
-		}
-		defer layer.ReleaseAndLog(p.config.LayerStore, l)
+	l, err := p.config.LayerStore.Get(rootfs.ChainID())
+	if err != nil {
+		return fmt.Errorf("failed to get top layer from image: %v", err)
 	}
+	defer l.Release()
 
 	hmacKey, err := metadata.ComputeV2MetadataHMACKey(p.config.AuthConfig)
 	if err != nil {
@@ -158,7 +155,7 @@ func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, id
 	}
 
 	// Loop bounds condition is to avoid pushing the base layer on Windows.
-	for i := 0; i < len(img.RootFS.DiffIDs); i++ {
+	for i := 0; i < len(rootfs.DiffIDs); i++ {
 		descriptor := descriptorTemplate
 		descriptor.layer = l
 		descriptor.checkedDigests = make(map[digest.Digest]struct{})
@@ -172,7 +169,7 @@ func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, id
 	}
 
 	// Try schema2 first
-	builder := schema2.NewManifestBuilder(p.repo.Blobs(ctx), img.RawJSON())
+	builder := schema2.NewManifestBuilder(p.repo.Blobs(ctx), p.config.ConfigMediaType, imgConfig)
 	manifest, err := manifestFromBuilder(ctx, builder, descriptors)
 	if err != nil {
 		return err
@@ -185,7 +182,7 @@ func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, id
 
 	putOptions := []distribution.ManifestServiceOption{distribution.WithTag(ref.Tag())}
 	if _, err = manSvc.Put(ctx, manifest, putOptions...); err != nil {
-		if runtime.GOOS == "windows" {
+		if runtime.GOOS == "windows" || p.config.TrustKey == nil || p.config.RequireSchema2 {
 			logrus.Warnf("failed to upload schema2 manifest: %v", err)
 			return err
 		}
@@ -196,7 +193,7 @@ func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, id
 		if err != nil {
 			return err
 		}
-		builder = schema1.NewConfigManifestBuilder(p.repo.Blobs(ctx), p.config.TrustKey, manifestRef, img.RawJSON())
+		builder = schema1.NewConfigManifestBuilder(p.repo.Blobs(ctx), p.config.TrustKey, manifestRef, imgConfig)
 		manifest, err = manifestFromBuilder(ctx, builder, descriptors)
 		if err != nil {
 			return err
@@ -246,7 +243,7 @@ func manifestFromBuilder(ctx context.Context, builder distribution.ManifestBuild
 }
 
 type v2PushDescriptor struct {
-	layer             layer.Layer
+	layer             PushLayer
 	v2MetadataService metadata.V2MetadataService
 	hmacKey           []byte
 	repoInfo          reference.Named
@@ -425,26 +422,32 @@ func (pd *v2PushDescriptor) uploadUsingSession(
 	diffID layer.DiffID,
 	layerUpload distribution.BlobWriter,
 ) (distribution.Descriptor, error) {
-	arch, err := pd.layer.TarStream()
-	if err != nil {
-		return distribution.Descriptor{}, xfer.DoNotRetry{Err: err}
-	}
-
-	// don't care if this fails; best effort
-	size, _ := pd.layer.DiffSize()
-
-	reader := progress.NewProgressReader(ioutils.NewCancelReadCloser(ctx, arch), progressOutput, size, pd.ID(), "Pushing")
-	compressedReader, compressionDone := compress(reader)
-	defer func() {
+	var reader io.ReadCloser
+
+	contentReader, err := pd.layer.Open()
+	size, _ := pd.layer.Size()
+
+	reader = progress.NewProgressReader(ioutils.NewCancelReadCloser(ctx, contentReader), progressOutput, size, pd.ID(), "Pushing")
+
+	switch m := pd.layer.MediaType(); m {
+	case schema2.MediaTypeUncompressedLayer:
+		compressedReader, compressionDone := compress(reader)
+		defer func(closer io.Closer) {
+			closer.Close()
+			<-compressionDone
+		}(reader)
+		reader = compressedReader
+	case schema2.MediaTypeLayer:
+	default:
 		reader.Close()
-		<-compressionDone
-	}()
+		return distribution.Descriptor{}, fmt.Errorf("unsupported layer media type %s", m)
+	}
 
 	digester := digest.Canonical.New()
-	tee := io.TeeReader(compressedReader, digester.Hash())
+	tee := io.TeeReader(reader, digester.Hash())
 
 	nn, err := layerUpload.ReadFrom(tee)
-	compressedReader.Close()
+	reader.Close()
 	if err != nil {
 		return distribution.Descriptor{}, retryOnError(err)
 	}
@@ -568,8 +571,8 @@ attempts:
 // repository and whether the check shall be done also with digests mapped to different repositories. The
 // decision is based on layer size. The smaller the layer, the fewer attempts shall be made because the cost
 // of upload does not outweigh a latency.
-func getMaxMountAndExistenceCheckAttempts(layer layer.Layer) (maxMountAttempts, maxExistenceCheckAttempts int, checkOtherRepositories bool) {
-	size, err := layer.DiffSize()
+func getMaxMountAndExistenceCheckAttempts(layer PushLayer) (maxMountAttempts, maxExistenceCheckAttempts int, checkOtherRepositories bool) {
+	size, err := layer.Size()
 	switch {
 	// big blob
 	case size > middleLayerMaximumSize:

distribution/push_v2_test.go

@@ -387,9 +387,11 @@ func TestLayerAlreadyExists(t *testing.T) {
 		ctx := context.Background()
 		ms := &mockV2MetadataService{}
 		pd := &v2PushDescriptor{
-			hmacKey:           []byte(tc.hmacKey),
-			repoInfo:          repoInfo,
-			layer:             layer.EmptyLayer,
+			hmacKey:  []byte(tc.hmacKey),
+			repoInfo: repoInfo,
+			layer: &storeLayer{
+				Layer: layer.EmptyLayer,
+			},
 			repo:              repo,
 			v2MetadataService: ms,
 			pushState:         &pushState{remoteLayers: make(map[layer.DiffID]distribution.Descriptor)},

distribution/registry.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/docker/distribution"
+	"github.com/docker/distribution/manifest/schema2"
 	distreference "github.com/docker/distribution/reference"
 	"github.com/docker/distribution/registry/client"
 	"github.com/docker/distribution/registry/client/auth"
@@ -18,6 +19,34 @@ import (
 	"golang.org/x/net/context"
 )
 
+// ImageTypes represents the schema2 config types for images
+var ImageTypes = []string{
+	schema2.MediaTypeImageConfig,
+	// Handle unexpected values from https://github.com/docker/distribution/issues/1621
+	"application/octet-stream",
+	// Treat defaulted values as images, newer types cannot be implied
+	"",
+}
+
+// PluginTypes represents the schema2 config types for plugins
+var PluginTypes = []string{
+	schema2.MediaTypePluginConfig,
+}
+
+var mediaTypeClasses map[string]string
+
+func init() {
+	// initialize media type classes with all know types for
+	// plugin
+	mediaTypeClasses = map[string]string{}
+	for _, t := range ImageTypes {
+		mediaTypeClasses[t] = "image"
+	}
+	for _, t := range PluginTypes {
+		mediaTypeClasses[t] = "plugin"
+	}
+}
+
 // NewV2Repository returns a repository (v2 only). It creates an HTTP transport
 // providing timeout settings and authentication support, and also verifies the
 // remote API version.

distribution/registry_unit_test.go

@@ -70,10 +70,13 @@ func testTokenPassThru(t *testing.T, ts *httptest.Server) {
 		Official: false,
 	}
 	imagePullConfig := &ImagePullConfig{
-		MetaHeaders: http.Header{},
-		AuthConfig: &types.AuthConfig{
-			RegistryToken: secretRegistryToken,
+		Config: Config{
+			MetaHeaders: http.Header{},
+			AuthConfig: &types.AuthConfig{
+				RegistryToken: secretRegistryToken,
+			},
 		},
+		Schema2Types: ImageTypes,
 	}
 	puller, err := newPuller(endpoint, repoInfo, imagePullConfig)
 	if err != nil {

vendor.conf

@@ -44,7 +44,7 @@ github.com/boltdb/bolt fff57c100f4dea1905678da7e90d92429dff2904
 github.com/miekg/dns 75e6e86cc601825c5dbcd4e0c209eab180997cd7
 
 # get graph and distribution packages
-github.com/docker/distribution a6bf3dd064f15598166bca2d66a9962a9555139e
+github.com/docker/distribution 28602af35aceda2f8d571bad7ca37a54cf0250bc
 github.com/vbatts/tar-split v0.10.1
 
 # get go-zfs packages

vendor/github.com/docker/distribution/digest/digest.go

@@ -80,6 +80,11 @@ func FromBytes(p []byte) Digest {
 	return Canonical.FromBytes(p)
 }
 
+// FromString digests the input and returns a Digest.
+func FromString(s string) Digest {
+	return Canonical.FromString(s)
+}
+
 // Validate checks that the contents of d is a valid digest, returning an
 // error if not.
 func (d Digest) Validate() error {

vendor/github.com/docker/distribution/digest/digester.go

@@ -129,6 +129,11 @@ func (a Algorithm) FromBytes(p []byte) Digest {
 	return digester.Digest()
 }
 
+// FromString digests the string input and returns a Digest.
+func (a Algorithm) FromString(s string) Digest {
+	return a.FromBytes([]byte(s))
+}
+
 // TODO(stevvooe): Allow resolution of verifiers using the digest type and
 // this registration system.
 

vendor/github.com/docker/distribution/manifest/schema1/config_builder.go

@@ -240,8 +240,13 @@ func (mb *configManifestBuilder) emptyTar(ctx context.Context) (digest.Digest, e
 
 // AppendReference adds a reference to the current ManifestBuilder
 func (mb *configManifestBuilder) AppendReference(d distribution.Describable) error {
-	// todo: verification here?
-	mb.descriptors = append(mb.descriptors, d.Descriptor())
+	descriptor := d.Descriptor()
+
+	if err := descriptor.Digest.Validate(); err != nil {
+		return err
+	}
+
+	mb.descriptors = append(mb.descriptors, descriptor)
 	return nil
 }
 

vendor/github.com/docker/distribution/manifest/schema2/builder.go

@@ -11,21 +11,25 @@ type builder struct {
 	// bs is a BlobService used to publish the configuration blob.
 	bs distribution.BlobService
 
+	// configMediaType is media type used to describe configuration
+	configMediaType string
+
 	// configJSON references
 	configJSON []byte
 
-	// layers is a list of layer descriptors that gets built by successive
-	// calls to AppendReference.
-	layers []distribution.Descriptor
+	// dependencies is a list of descriptors that gets built by successive
+	// calls to AppendReference. In case of image configuration these are layers.
+	dependencies []distribution.Descriptor
 }
 
 // NewManifestBuilder is used to build new manifests for the current schema
 // version. It takes a BlobService so it can publish the configuration blob
 // as part of the Build process.
-func NewManifestBuilder(bs distribution.BlobService, configJSON []byte) distribution.ManifestBuilder {
+func NewManifestBuilder(bs distribution.BlobService, configMediaType string, configJSON []byte) distribution.ManifestBuilder {
 	mb := &builder{
-		bs:         bs,
-		configJSON: make([]byte, len(configJSON)),
+		bs:              bs,
+		configMediaType: configMediaType,
+		configJSON:      make([]byte, len(configJSON)),
 	}
 	copy(mb.configJSON, configJSON)
 
@@ -36,9 +40,9 @@ func NewManifestBuilder(bs distribution.BlobService, configJSON []byte) distribu
 func (mb *builder) Build(ctx context.Context) (distribution.Manifest, error) {
 	m := Manifest{
 		Versioned: SchemaVersion,
-		Layers:    make([]distribution.Descriptor, len(mb.layers)),
+		Layers:    make([]distribution.Descriptor, len(mb.dependencies)),
 	}
-	copy(m.Layers, mb.layers)
+	copy(m.Layers, mb.dependencies)
 
 	configDigest := digest.FromBytes(mb.configJSON)
 
@@ -48,7 +52,7 @@ func (mb *builder) Build(ctx context.Context) (distribution.Manifest, error) {
 	case nil:
 		// Override MediaType, since Put always replaces the specified media
 		// type with application/octet-stream in the descriptor it returns.
-		m.Config.MediaType = MediaTypeConfig
+		m.Config.MediaType = mb.configMediaType
 		return FromStruct(m)
 	case distribution.ErrBlobUnknown:
 		// nop
@@ -57,10 +61,10 @@ func (mb *builder) Build(ctx context.Context) (distribution.Manifest, error) {
 	}
 
 	// Add config to the blob store
-	m.Config, err = mb.bs.Put(ctx, MediaTypeConfig, mb.configJSON)
+	m.Config, err = mb.bs.Put(ctx, mb.configMediaType, mb.configJSON)
 	// Override MediaType, since Put always replaces the specified media
 	// type with application/octet-stream in the descriptor it returns.
-	m.Config.MediaType = MediaTypeConfig
+	m.Config.MediaType = mb.configMediaType
 	if err != nil {
 		return nil, err
 	}
@@ -70,11 +74,11 @@ func (mb *builder) Build(ctx context.Context) (distribution.Manifest, error) {
 
 // AppendReference adds a reference to the current ManifestBuilder.
 func (mb *builder) AppendReference(d distribution.Describable) error {
-	mb.layers = append(mb.layers, d.Descriptor())
+	mb.dependencies = append(mb.dependencies, d.Descriptor())
 	return nil
 }
 
 // References returns the current references added to this builder.
 func (mb *builder) References() []distribution.Descriptor {
-	return mb.layers
+	return mb.dependencies
 }

vendor/github.com/docker/distribution/manifest/schema2/manifest.go

@@ -14,8 +14,8 @@ const (
 	// MediaTypeManifest specifies the mediaType for the current version.
 	MediaTypeManifest = "application/vnd.docker.distribution.manifest.v2+json"
 
-	// MediaTypeConfig specifies the mediaType for the image configuration.
-	MediaTypeConfig = "application/vnd.docker.container.image.v1+json"
+	// MediaTypeImageConfig specifies the mediaType for the image configuration.
+	MediaTypeImageConfig = "application/vnd.docker.container.image.v1+json"
 
 	// MediaTypePluginConfig specifies the mediaType for plugin configuration.
 	MediaTypePluginConfig = "application/vnd.docker.plugin.v1+json"
@@ -27,6 +27,10 @@ const (
 	// MediaTypeForeignLayer is the mediaType used for layers that must be
 	// downloaded from foreign URLs.
 	MediaTypeForeignLayer = "application/vnd.docker.image.rootfs.foreign.diff.tar.gzip"
+
+	// MediaTypeUncompressedLayer is the mediaType used for layers which
+	// are not compressed.
+	MediaTypeUncompressedLayer = "application/vnd.docker.image.rootfs.diff.tar"
 )
 
 var (

vendor/github.com/docker/distribution/registry/client/auth/session.go

@@ -155,7 +155,9 @@ type RepositoryScope struct {
 // using the scope grammar
 func (rs RepositoryScope) String() string {
 	repoType := "repository"
-	if rs.Class != "" {
+	// Keep existing format for image class to maintain backwards compatibility
+	// with authorization servers which do not support the expanded grammar.
+	if rs.Class != "" && rs.Class != "image" {
 		repoType = fmt.Sprintf("%s(%s)", repoType, rs.Class)
 	}
 	return fmt.Sprintf("%s:%s:%s", repoType, rs.Repository, strings.Join(rs.Actions, ","))