Add manifest creation to new registry data model interface

data/registry_model/interface.py

@@ -35,6 +35,19 @@ class RegistryDataInterface(object):
     """ Looks up the manifest with the given digest under the given repository and returns it
         or None if none. """
 
+  @abstractmethod
+  def create_manifest_and_retarget_tag(self, repository_ref, manifest_interface_instance, tag_name):
+    """ Creates a manifest in a repository, adding all of the necessary data in the model.
+
+        The `manifest_interface_instance` parameter must be an instance of the manifest
+        interface as returned by the image/docker package.
+
+        Note that all blobs referenced by the manifest must exist under the repository or this
+        method will fail and return None.
+
+        Returns a reference to the (created manifest, tag) or (None, None) on error.
+    """
+
   @abstractmethod
   def get_legacy_images(self, repository_ref):
     """
@@ -255,3 +268,9 @@ class RegistryDataInterface(object):
     operations if an existing blob from another repositroy is being pushed. Returns False if
     the mounting fails.
     """
+
+  @abstractmethod
+  def set_tags_expiration_for_manifest(self, manifest, expiration_sec):
+    """
+    Sets the expiration on all tags that point to the given manifest to that specified.
+    """