anchor.diff:                          Active ->
                               Acc;
                           Elem=?MANIFEST{state=active} ->
  +                            [UUID | Acc];
  +                        Elem=?MANIFEST{state=writing} ->
                               [UUID | Acc];
                           _ ->
                               Acc
  
positive.code: %% active state
  -spec active_manifests(term()) -> [lfs_manifest()].
  active_manifests(Manifests) ->
      IsActive = fun (?MANIFEST{state=State}) -> State == active end,
      lists:filter(IsActive, orddict_values(Manifests)).
  
  %% @doc Mark all active manifests
  
negative.code:               acl=Acl,
                props=Properties,
                cluster_id=ClusterID};
  
  upgrade_manifest(?MANIFEST{}=M) ->
      M.
  
  