Move to a single tag-store

Signed-off-by: John Howard <jhoward@microsoft.com>

daemon/daemon.go

@@ -75,7 +75,6 @@ type daemonStore struct {
 	imageStore                image.Store
 	layerStore                layer.Store
 	distributionMetadataStore dmetadata.Store
-	referenceStore            refstore.Store
 }
 
 // Daemon holds information about the Docker daemon.
@@ -103,7 +102,8 @@ type Daemon struct {
 	shutdown              bool
 	idMappings            *idtools.IDMappings
 	stores                map[string]daemonStore // By container target platform
-	PluginStore           *plugin.Store          // todo: remove
+	referenceStore        refstore.Store
+	PluginStore           *plugin.Store // todo: remove
 	pluginManager         *plugin.Manager
 	linkIndex             *linkIndex
 	containerd            libcontainerd.Client
@@ -691,7 +691,6 @@ func NewDaemon(config *config.Config, registryService registry.Service, containe
 	d.downloadManager = xfer.NewLayerDownloadManager(lsMap, *config.MaxConcurrentDownloads)
 	logrus.Debugf("Max Concurrent Uploads: %d", *config.MaxConcurrentUploads)
 	d.uploadManager = xfer.NewLayerUploadManager(*config.MaxConcurrentUploads)
-
 	for platform, ds := range d.stores {
 		imageRoot := filepath.Join(config.Root, "image", ds.graphDriver)
 		ifs, err := image.NewFSStoreBackend(filepath.Join(imageRoot, "imagedb"))
@@ -728,18 +727,30 @@ func NewDaemon(config *config.Config, registryService registry.Service, containe
 
 	eventsService := events.New()
 
+	// We have a single tag/reference store for the daemon globally. However, it's
+	// stored under the graphdriver. On host platforms which only support a single
+	// container OS, but multiple selectable graphdrivers, this means depending on which
+	// graphdriver is chosen, the global reference store is under there. For
+	// platforms which support multiple container operating systems, this is slightly
+	// more problematic as where does the global ref store get located? Fortunately,
+	// for Windows, which is currently the only daemon supporting multiple container
+	// operating systems, the list of graphdrivers available isn't user configurable.
+	// For backwards compatibility, we just put it under the windowsfilter
+	// directory regardless.
+	refStoreLocation := filepath.Join(d.stores[runtime.GOOS].imageRoot, `repositories.json`)
+	rs, err := refstore.NewReferenceStore(refStoreLocation)
+	if err != nil {
+		return nil, fmt.Errorf("Couldn't create reference store repository: %s", err)
+	}
+	d.referenceStore = rs
+
 	for platform, ds := range d.stores {
 		dms, err := dmetadata.NewFSMetadataStore(filepath.Join(ds.imageRoot, "distribution"), platform)
 		if err != nil {
 			return nil, err
 		}
 
-		rs, err := refstore.NewReferenceStore(filepath.Join(ds.imageRoot, "repositories.json"), platform)
-		if err != nil {
-			return nil, fmt.Errorf("Couldn't create Tag store repositories: %s", err)
-		}
 		ds.distributionMetadataStore = dms
-		ds.referenceStore = rs
 		d.stores[platform] = ds
 
 		// No content-addressability migration on Windows as it never supported pre-CA

daemon/disk_usage.go

@@ -20,7 +20,7 @@ func (daemon *Daemon) getLayerRefs(platform string) map[layer.ChainID]int {
 	layerRefs := map[layer.ChainID]int{}
 	for id, img := range tmpImages {
 		dgst := digest.Digest(id)
-		if len(daemon.stores[platform].referenceStore.References(dgst)) == 0 && len(daemon.stores[platform].imageStore.Children(id)) != 0 {
+		if len(daemon.referenceStore.References(dgst)) == 0 && len(daemon.stores[platform].imageStore.Children(id)) != 0 {
 			continue
 		}
 

daemon/image.go

@@ -2,6 +2,7 @@ package daemon
 
 import (
 	"fmt"
+	"runtime"
 
 	"github.com/docker/distribution/reference"
 	"github.com/docker/docker/image"
@@ -45,10 +46,17 @@ func (daemon *Daemon) GetImageIDAndPlatform(refOrID string) (image.ID, string, e
 		return "", "", errImageDoesNotExist{ref}
 	}
 
-	for platform := range daemon.stores {
-		if id, err := daemon.stores[platform].referenceStore.Get(namedRef); err == nil {
-			return image.IDFromDigest(id), platform, nil
+	if digest, err := daemon.referenceStore.Get(namedRef); err == nil {
+		// Search the image stores to get the platform, defaulting to host OS.
+		imagePlatform := runtime.GOOS
+		id := image.IDFromDigest(digest)
+		for platform := range daemon.stores {
+			if img, err := daemon.stores[platform].imageStore.Get(id); err == nil {
+				imagePlatform = img.Platform()
+				break
+			}
 		}
+		return id, imagePlatform, nil
 	}
 
 	// deprecated: repo:shortid https://github.com/docker/docker/pull/799
@@ -56,7 +64,7 @@ func (daemon *Daemon) GetImageIDAndPlatform(refOrID string) (image.ID, string, e
 		if tag := tagged.Tag(); stringid.IsShortID(stringid.TruncateID(tag)) {
 			for platform := range daemon.stores {
 				if id, err := daemon.stores[platform].imageStore.Search(tag); err == nil {
-					for _, storeRef := range daemon.stores[platform].referenceStore.References(id.Digest()) {
+					for _, storeRef := range daemon.referenceStore.References(id.Digest()) {
 						if storeRef.Name() == namedRef.Name() {
 							return id, platform, nil
 						}

daemon/image_delete.go

@@ -70,7 +70,7 @@ func (daemon *Daemon) ImageDelete(imageRef string, force, prune bool) ([]types.I
 		return nil, err
 	}
 
-	repoRefs := daemon.stores[platform].referenceStore.References(imgID.Digest())
+	repoRefs := daemon.referenceStore.References(imgID.Digest())
 
 	var removedRepositoryRef bool
 	if !isImageIDPrefix(imgID.String(), imageRef) {
@@ -104,7 +104,7 @@ func (daemon *Daemon) ImageDelete(imageRef string, force, prune bool) ([]types.I
 		daemon.LogImageEvent(imgID.String(), imgID.String(), "untag")
 		records = append(records, untaggedRecord)
 
-		repoRefs = daemon.stores[platform].referenceStore.References(imgID.Digest())
+		repoRefs = daemon.referenceStore.References(imgID.Digest())
 
 		// If a tag reference was removed and the only remaining
 		// references to the same repository are digest references,
@@ -237,7 +237,7 @@ func (daemon *Daemon) removeImageRef(platform string, ref reference.Named) (refe
 	// Ignore the boolean value returned, as far as we're concerned, this
 	// is an idempotent operation and it's okay if the reference didn't
 	// exist in the first place.
-	_, err := daemon.stores[platform].referenceStore.Delete(ref)
+	_, err := daemon.referenceStore.Delete(ref)
 
 	return ref, err
 }
@@ -248,7 +248,7 @@ func (daemon *Daemon) removeImageRef(platform string, ref reference.Named) (refe
 // daemon's event service. An "Untagged" types.ImageDeleteResponseItem is added to the
 // given list of records.
 func (daemon *Daemon) removeAllReferencesToImageID(imgID image.ID, platform string, records *[]types.ImageDeleteResponseItem) error {
-	imageRefs := daemon.stores[platform].referenceStore.References(imgID.Digest())
+	imageRefs := daemon.referenceStore.References(imgID.Digest())
 
 	for _, imageRef := range imageRefs {
 		parsedRef, err := daemon.removeImageRef(platform, imageRef)
@@ -383,7 +383,7 @@ func (daemon *Daemon) checkImageDeleteConflict(imgID image.ID, platform string,
 	}
 
 	// Check if any repository tags/digest reference this image.
-	if mask&conflictActiveReference != 0 && len(daemon.stores[platform].referenceStore.References(imgID.Digest())) > 0 {
+	if mask&conflictActiveReference != 0 && len(daemon.referenceStore.References(imgID.Digest())) > 0 {
 		return &imageDeleteConflict{
 			imgID:   imgID,
 			message: "image is referenced in multiple repositories",
@@ -411,5 +411,5 @@ func (daemon *Daemon) checkImageDeleteConflict(imgID image.ID, platform string,
 // that there are no repository references to the given image and it has no
 // child images.
 func (daemon *Daemon) imageIsDangling(imgID image.ID, platform string) bool {
-	return !(len(daemon.stores[platform].referenceStore.References(imgID.Digest())) > 0 || len(daemon.stores[platform].imageStore.Children(imgID)) > 0)
+	return !(len(daemon.referenceStore.References(imgID.Digest())) > 0 || len(daemon.stores[platform].imageStore.Children(imgID)) > 0)
 }

daemon/image_exporter.go

@@ -19,7 +19,7 @@ func (daemon *Daemon) ExportImage(names []string, outStream io.Writer) error {
 	if system.LCOWSupported() {
 		platform = "linux"
 	}
-	imageExporter := tarexport.NewTarExporter(daemon.stores[platform].imageStore, daemon.stores[platform].layerStore, daemon.stores[platform].referenceStore, daemon)
+	imageExporter := tarexport.NewTarExporter(daemon.stores[platform].imageStore, daemon.stores[platform].layerStore, daemon.referenceStore, daemon)
 	return imageExporter.Save(names, outStream)
 }
 
@@ -32,6 +32,6 @@ func (daemon *Daemon) LoadImage(inTar io.ReadCloser, outStream io.Writer, quiet
 	if system.LCOWSupported() {
 		platform = "linux"
 	}
-	imageExporter := tarexport.NewTarExporter(daemon.stores[platform].imageStore, daemon.stores[platform].layerStore, daemon.stores[platform].referenceStore, daemon)
+	imageExporter := tarexport.NewTarExporter(daemon.stores[platform].imageStore, daemon.stores[platform].layerStore, daemon.referenceStore, daemon)
 	return imageExporter.Load(inTar, outStream, quiet)
 }

daemon/image_history.go

@@ -69,7 +69,7 @@ func (daemon *Daemon) ImageHistory(name string) ([]*image.HistoryResponseItem, e
 		h.ID = id.String()
 
 		var tags []string
-		for _, r := range daemon.stores[platform].referenceStore.References(id.Digest()) {
+		for _, r := range daemon.referenceStore.References(id.Digest()) {
 			if _, ok := r.(reference.NamedTagged); ok {
 				tags = append(tags, reference.FamiliarString(r))
 			}

daemon/image_inspect.go

@@ -24,7 +24,7 @@ func (daemon *Daemon) LookupImage(name string) (*types.ImageInspect, error) {
 		platform = runtime.GOOS
 	}
 
-	refs := daemon.stores[platform].referenceStore.References(img.ID().Digest())
+	refs := daemon.referenceStore.References(img.ID().Digest())
 	repoTags := []string{}
 	repoDigests := []string{}
 	for _, ref := range refs {

daemon/image_pull.go

@@ -74,7 +74,7 @@ func (daemon *Daemon) pullImageWithReference(ctx context.Context, ref reference.
 			ImageEventLogger: daemon.LogImageEvent,
 			MetadataStore:    daemon.stores[platform].distributionMetadataStore,
 			ImageStore:       distribution.NewImageConfigStoreFromStore(daemon.stores[platform].imageStore),
-			ReferenceStore:   daemon.stores[platform].referenceStore,
+			ReferenceStore:   daemon.referenceStore,
 		},
 		DownloadManager: daemon.downloadManager,
 		Schema2Types:    distribution.ImageTypes,

daemon/image_push.go

@@ -56,7 +56,7 @@ func (daemon *Daemon) PushImage(ctx context.Context, image, tag string, metaHead
 			ImageEventLogger: daemon.LogImageEvent,
 			MetadataStore:    daemon.stores[platform].distributionMetadataStore,
 			ImageStore:       distribution.NewImageConfigStoreFromStore(daemon.stores[platform].imageStore),
-			ReferenceStore:   daemon.stores[platform].referenceStore,
+			ReferenceStore:   daemon.referenceStore,
 		},
 		ConfigMediaType: schema2.MediaTypeImageConfig,
 		LayerStore:      distribution.NewLayerProviderFromStore(daemon.stores[platform].layerStore),

daemon/image_tag.go

@@ -28,7 +28,7 @@ func (daemon *Daemon) TagImage(imageName, repository, tag string) error {
 
 // TagImageWithReference adds the given reference to the image ID provided.
 func (daemon *Daemon) TagImageWithReference(imageID image.ID, platform string, newTag reference.Named) error {
-	if err := daemon.stores[platform].referenceStore.AddTag(newTag, imageID.Digest(), true); err != nil {
+	if err := daemon.referenceStore.AddTag(newTag, imageID.Digest(), true); err != nil {
 		return err
 	}
 

daemon/images.go

@@ -149,7 +149,7 @@ func (daemon *Daemon) Images(imageFilters filters.Args, all bool, withExtraAttrs
 
 		newImage := newImage(img, size)
 
-		for _, ref := range daemon.stores[platform].referenceStore.References(id.Digest()) {
+		for _, ref := range daemon.referenceStore.References(id.Digest()) {
 			if imageFilters.Include("reference") {
 				var found bool
 				var matchErr error

daemon/prune.go

@@ -221,7 +221,7 @@ func (daemon *Daemon) ImagesPrune(ctx context.Context, pruneFilters filters.Args
 			return nil, ctx.Err()
 		default:
 			dgst := digest.Digest(id)
-			if len(daemon.stores[platform].referenceStore.References(dgst)) == 0 && len(daemon.stores[platform].imageStore.Children(id)) != 0 {
+			if len(daemon.referenceStore.References(dgst)) == 0 && len(daemon.stores[platform].imageStore.Children(id)) != 0 {
 				continue
 			}
 			if !until.IsZero() && img.Created.After(until) {
@@ -252,7 +252,7 @@ deleteImagesLoop:
 		}
 
 		deletedImages := []types.ImageDeleteResponseItem{}
-		refs := daemon.stores[platform].referenceStore.References(dgst)
+		refs := daemon.referenceStore.References(dgst)
 		if len(refs) > 0 {
 			shouldDelete := !danglingOnly
 			if !shouldDelete {

reference/store.go

@@ -26,7 +26,7 @@ type Association struct {
 	ID  digest.Digest
 }
 
-// Store provides the set of methods which can operate on a tag store.
+// Store provides the set of methods which can operate on a reference store.
 type Store interface {
 	References(id digest.Digest) []reference.Named
 	ReferencesByName(ref reference.Named) []Association
@@ -46,9 +46,6 @@ type store struct {
 	// referencesByIDCache is a cache of references indexed by ID, to speed
 	// up References.
 	referencesByIDCache map[digest.Digest]map[string]reference.Named
-	// platform is the container target platform for this store (which may be
-	// different to the host operating system
-	platform string
 }
 
 // Repository maps tags to digests. The key is a stringified Reference,
@@ -73,7 +70,7 @@ func (a lexicalAssociations) Less(i, j int) bool {
 
 // NewReferenceStore creates a new reference store, tied to a file path where
 // the set of references are serialized in JSON format.
-func NewReferenceStore(jsonPath, platform string) (Store, error) {
+func NewReferenceStore(jsonPath string) (Store, error) {
 	abspath, err := filepath.Abs(jsonPath)
 	if err != nil {
 		return nil, err
@@ -83,7 +80,6 @@ func NewReferenceStore(jsonPath, platform string) (Store, error) {
 		jsonPath:            abspath,
 		Repositories:        make(map[string]repository),
 		referencesByIDCache: make(map[digest.Digest]map[string]reference.Named),
-		platform:            platform,
 	}
 	// Load the json file if it exists, otherwise create it.
 	if err := store.reload(); os.IsNotExist(err) {

reference/store_test.go

@@ -5,7 +5,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"testing"
 
@@ -41,7 +40,7 @@ func TestLoad(t *testing.T) {
 	}
 	jsonFile.Close()
 
-	store, err := NewReferenceStore(jsonFile.Name(), runtime.GOOS)
+	store, err := NewReferenceStore(jsonFile.Name())
 	if err != nil {
 		t.Fatalf("error creating tag store: %v", err)
 	}
@@ -70,7 +69,7 @@ func TestSave(t *testing.T) {
 	jsonFile.Close()
 	defer os.RemoveAll(jsonFile.Name())
 
-	store, err := NewReferenceStore(jsonFile.Name(), runtime.GOOS)
+	store, err := NewReferenceStore(jsonFile.Name())
 	if err != nil {
 		t.Fatalf("error creating tag store: %v", err)
 	}
@@ -112,7 +111,7 @@ func TestAddDeleteGet(t *testing.T) {
 	jsonFile.Close()
 	defer os.RemoveAll(jsonFile.Name())
 
-	store, err := NewReferenceStore(jsonFile.Name(), runtime.GOOS)
+	store, err := NewReferenceStore(jsonFile.Name())
 	if err != nil {
 		t.Fatalf("error creating tag store: %v", err)
 	}
@@ -329,7 +328,7 @@ func TestInvalidTags(t *testing.T) {
 	tmpDir, err := ioutil.TempDir("", "tag-store-test")
 	defer os.RemoveAll(tmpDir)
 
-	store, err := NewReferenceStore(filepath.Join(tmpDir, "repositories.json"), runtime.GOOS)
+	store, err := NewReferenceStore(filepath.Join(tmpDir, "repositories.json"))
 	if err != nil {
 		t.Fatalf("error creating tag store: %v", err)
 	}