def get_user_group(): keystone_user_id = None keystone_group_id = None try: a = CONF.command.keystone_user if a: keystone_user_id = utils.get_unix_user(a)[0] except KeyError: raise ValueError("Unknown user '%s' in --keystone-user" % a) try: a = CONF.command.keystone_group if a: keystone_group_id = utils.get_unix_group(a)[0] except KeyError: raise ValueError("Unknown group '%s' in --keystone-group" % a) return keystone_user_id, keystone_group_id