def do_list(self, resource):
        """
        Enumerate resources

        Possible values: plugins, volumes
        """
        if resource == 'plugins':
            self.__list_plugins()
        elif resource == 'volumes':
            self.__list_volumes()
        else:
            self.logger.error("Unknown resource: '{}', type 'help list' "
                              "to get more information".format(resource))