Extract ImageService interface from the image service

Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/daemon.go

@@ -79,7 +79,7 @@ type Daemon struct {
 	containers            container.Store
 	containersReplica     container.ViewDB
 	execCommands          *exec.Store
-	imageService          *images.ImageService
+	imageService          ImageService
 	configStore           *config.Config
 	statsCollector        *stats.Collector
 	defaultLogConfig      containertypes.LogConfig
@@ -1473,7 +1473,7 @@ func (daemon *Daemon) IdentityMapping() idtools.IdentityMapping {
 }
 
 // ImageService returns the Daemon's ImageService
-func (daemon *Daemon) ImageService() *images.ImageService {
+func (daemon *Daemon) ImageService() ImageService {
 	return daemon.imageService
 }
 
@@ -1481,7 +1481,7 @@ func (daemon *Daemon) ImageService() *images.ImageService {
 func (daemon *Daemon) BuilderBackend() builder.Backend {
 	return struct {
 		*Daemon
-		*images.ImageService
+		ImageService
 	}{daemon, daemon.imageService}
 }
 

daemon/image_service.go

@@ -0,0 +1,78 @@
+package daemon
+
+import (
+	"context"
+	"io"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/reference"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/backend"
+	"github.com/docker/docker/api/types/filters"
+	imagetype "github.com/docker/docker/api/types/image"
+	"github.com/docker/docker/api/types/registry"
+	"github.com/docker/docker/builder"
+	"github.com/docker/docker/container"
+	"github.com/docker/docker/daemon/images"
+	"github.com/docker/docker/image"
+	"github.com/docker/docker/layer"
+	v1 "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+// ImageService is a temporary interface to assist in the migration to the
+// containerd image-store. This interface should not be considered stable,
+// and may change over time.
+type ImageService interface {
+	// Images
+
+	PullImage(ctx context.Context, image, tag string, platform *v1.Platform, metaHeaders map[string][]string, authConfig *types.AuthConfig, outStream io.Writer) error
+	PushImage(ctx context.Context, image, tag string, metaHeaders map[string][]string, authConfig *types.AuthConfig, outStream io.Writer) error
+	CreateImage(config []byte, parent string) (builder.Image, error)
+	ImageDelete(imageRef string, force, prune bool) ([]types.ImageDeleteResponseItem, error)
+	ExportImage(names []string, outStream io.Writer) error
+	LoadImage(inTar io.ReadCloser, outStream io.Writer, quiet bool) error
+	Images(ctx context.Context, opts types.ImageListOptions) ([]*types.ImageSummary, error)
+	LogImageEvent(imageID, refName, action string)
+	LogImageEventWithAttributes(imageID, refName, action string, attributes map[string]string)
+	CountImages() int
+	ImageDiskUsage(ctx context.Context) ([]*types.ImageSummary, error)
+	ImagesPrune(ctx context.Context, pruneFilters filters.Args) (*types.ImagesPruneReport, error)
+	ImportImage(src string, repository string, platform *v1.Platform, tag string, msg string, inConfig io.ReadCloser, outStream io.Writer, changes []string) error
+	TagImage(imageName, repository, tag string) (string, error)
+	TagImageWithReference(imageID image.ID, newTag reference.Named) error
+	GetImage(refOrID string, platform *v1.Platform) (retImg *image.Image, retErr error)
+	ImageHistory(name string) ([]*imagetype.HistoryResponseItem, error)
+	CommitImage(c backend.CommitConfig) (image.ID, error)
+	SquashImage(id, parent string) (string, error)
+
+	// Layers
+
+	GetImageAndReleasableLayer(ctx context.Context, refOrID string, opts backend.GetImageAndLayerOptions) (builder.Image, builder.ROLayer, error)
+	CreateLayer(container *container.Container, initFunc layer.MountInit) (layer.RWLayer, error)
+	GetLayerByID(cid string) (layer.RWLayer, error)
+	LayerStoreStatus() [][2]string
+	GetLayerMountID(cid string) (string, error)
+	ReleaseLayer(rwlayer layer.RWLayer) error
+	LayerDiskUsage(ctx context.Context) (int64, error)
+	GetContainerLayerSize(containerID string) (int64, int64)
+
+	// Windows specific
+
+	GetLayerFolders(img *image.Image, rwLayer layer.RWLayer) ([]string, error)
+
+	// Build
+
+	MakeImageCache(sourceRefs []string) builder.ImageCache
+	CommitBuildStep(c backend.CommitConfig) (image.ID, error)
+
+	// Other
+
+	GetRepository(ctx context.Context, ref reference.Named, authConfig *types.AuthConfig) (distribution.Repository, error)
+	Map() map[image.ID]*image.Image
+	SearchRegistryForImages(ctx context.Context, searchFilters filters.Args, term string, limit int, authConfig *types.AuthConfig, headers map[string][]string) (*registry.SearchResults, error)
+	DistributionServices() images.DistributionServices
+	Children(id image.ID) []image.ID
+	Cleanup() error
+	GraphDriverName() string
+	UpdateConfig(maxDownloads, maxUploads int)
+}

daemon/images/image_unix.go

@@ -4,9 +4,17 @@
 package images // import "github.com/docker/docker/daemon/images"
 
 import (
+	"github.com/docker/docker/image"
+	"github.com/docker/docker/layer"
 	"github.com/sirupsen/logrus"
 )
 
+// GetLayerFolders returns the layer folders from an image RootFS
+func (i *ImageService) GetLayerFolders(img *image.Image, rwLayer layer.RWLayer) ([]string, error) {
+	// Windows specific
+	panic("not implemented")
+}
+
 // GetContainerLayerSize returns the real size & virtual size of the container.
 func (i *ImageService) GetContainerLayerSize(containerID string) (int64, int64) {
 	var (