def import_file(self, instance, local_file, remote_name):
        """Import an image from local storage into this backend.

        Import a local file into the store used by this image type. Note that
        this is a noop for stores using local disk (the local file is
        considered "in the store").

        If the image already exists it will be overridden by the new file

        :param local_file: path to the file to import
        :param remote_name: the name for the file in the store
        """

        # NOTE(mikal): this is a noop for now for all stores except RBD, but
        # we should talk about if we want this functionality for everything.
        pass