driver.py 文件源码

def load_engine_driver(engine_driver):
    """Load a engine driver module.

    Load the engine driver module specified by the engine_driver
    configuration option or, if supplied, the driver name supplied as an
    argument.

    :param engine_driver: a engine driver name to override the config opt
    :returns: a EngineDriver server
    """

    if not engine_driver:
        LOG.error("Engine driver option required, but not specified")
        sys.exit(1)

    LOG.info("Loading engine driver '%s'", engine_driver)
    try:
        driver = importutils.import_object(
            'mogan.baremetal.%s' % engine_driver)
        return utils.check_isinstance(driver, BaseEngineDriver)
    except ImportError:
        LOG.exception("Unable to load the baremetal driver")
        sys.exit(1)