(self, dest, url, rev_options)
Update an already-existing repo to the given ``rev_options``.

        Args:
          rev_options: a RevOptions object.
Update an already-existing repo to the given ``rev_options``.
Update an already - existing repo to the given rev_options .
def update(self, dest, url, rev_options):
        """
        Update an already-existing repo to the given ``rev_options``.

        Args:
          rev_options: a RevOptions object.
        """
        raise NotImplementedError
def update ( self , dest , url , rev_options ) : raise NotImplementedError