disabled deletion of layers

registry.py

@@ -251,9 +251,13 @@ def delete_tags(
 
     for tag in tags_to_delete:
         print "  deleting tag {}".format(tag)
-        for layer in registry.list_tag_layers(image_name, tag):
-            layer_digest = layer['digest']
-            registry.delete_tag_layer(image_name, layer_digest, dry_run)
+
+##        deleting layers is disabled because 
+##        it also deletes shared layers
+##        
+##        for layer in registry.list_tag_layers(image_name, tag):
+##            layer_digest = layer['digest']
+##            registry.delete_tag_layer(image_name, layer_digest, dry_run)
 
         registry.delete_tag(image_name, tag, dry_run)