444         files.

   444         files.

   445         """

   445         """

   446         pass

   446         pass

   447 

   447 

   448     def exists(self, fname):

   448     def exists(self, fname):

   449         raise NotImplementedError

   452         raise NotImplementedError

   450 

   453 

   451 class fsbackend(abstractbackend):

   454 class fsbackend(abstractbackend):

   452     def __init__(self, ui, basedir):

   455     def __init__(self, ui, basedir):

   453         super(fsbackend, self).__init__(ui)

   456         super(fsbackend, self).__init__(ui)