make it runnable now, need to resolve comment

Signed-off-by: Xiaoxuan Wang <[email protected]>

Author: wangxiaoxuan273

content/oci/deletableoci.go

@@ -57,7 +57,7 @@ type DeletableStore struct {
 
 	storage     *Storage
 	tagResolver *resolver.Memory
-	graph       *graph.DeletableMemory
+	graph       *graph.Memory
 }
 
 // NewDeletableStore returns a new DeletableStore.
@@ -78,12 +78,12 @@ func NewDeletableStoreWithContext(ctx context.Context, root string) (*DeletableS
 	store := &DeletableStore{
 		AutoSaveIndex: true,
 		root:          rootAbs,
-		indexPath:     filepath.Join(rootAbs, ociImageIndexFile),
+		indexPath:     filepath.Join(rootAbs, ocispec.ImageIndexFile),
 		storage:       storage,
 		tagResolver:   resolver.NewMemory(),
-		graph:         graph.NewDeletableMemory(),
+		graph:         graph.NewMemory(),
 	}
-	if err := ensureDir(filepath.Join(rootAbs, ociBlobsDir)); err != nil {
+	if err := ensureDir(filepath.Join(rootAbs, ocispec.ImageBlobsDir)); err != nil {
 		return nil, err
 	}
 	if err := store.ensureOCILayoutFile(); err != nil {
@@ -338,7 +338,7 @@ func (ds *DeletableStore) writeIndexFile() error {
 }
 
 // loadIndexInDeletableMemory loads index into the memory.
-func loadIndexInDeletableMemory(ctx context.Context, index *ocispec.Index, fetcher content.Fetcher, tagger content.Tagger, graph *graph.DeletableMemory) error {
+func loadIndexInDeletableMemory(ctx context.Context, index *ocispec.Index, fetcher content.Fetcher, tagger content.Tagger, graph *graph.Memory) error {
 	for _, desc := range index.Manifests {
 		if err := tagger.Tag(ctx, deleteAnnotationRefName(desc), desc.Digest.String()); err != nil {
 			return err