more details in case of shared dir for blobs

oci/layout/oci_delete.go

@@ -79,17 +79,28 @@ func (ref ociReference) DeleteImage(ctx context.Context, sys *types.SystemContex
 		if err != nil {
 			return err
 		}
+
 		_, err = os.Stat(blobPath)
 		if err == nil {
 			logrus.Debug("Deleting blob ", digest.Hex())
 			err = os.Remove(blobPath)
 			if err != nil && !os.IsNotExist(err) {
 				return err
 			}
-			//
 		} else {
 			if os.IsNotExist(err) {
-				logrus.Info("Blob ", digest.Hex(), " not found in image directory; it was either previously deleted or is in the shared blobs directory")
+				potentialBlobPathInSharedDir, err := ref.blobPath(digest, sharedBlobsDir)
+				if err != nil {
+					return err
+				}
+				_, err = os.Stat(potentialBlobPathInSharedDir)
+				if err == nil {
+					logrus.Debug("Blob ", digest.Hex(), " is in the the shared blobs directory, leaving it")
+				} else if os.IsNotExist(err) {
+					logrus.Info("Blob ", digest.Hex(), " not found either in image directory nor shared directory")
+				} else {
+					return err
+				}
 			} else {
 				return err
 			}