cfn.py 文件源码

def _check_want_to_be_running(stackname, autostart=False):
    try:
        context = context_handler.load_context(stackname)
        if not _are_there_existing_servers(context):
            return False

    except context_handler.MissingContextFile as e:
        LOG.warn(e)

    instance_list = core.find_ec2_instances(stackname, allow_empty=True)
    num_instances = len(instance_list)
    if num_instances >= 1:
        return instance_list

    if not autostart:
        should_start = utils._pick('should_start', [True, False], message='Stack not running. Should it be started?')
        if not should_start:
            return False

    core_lifecycle.start(stackname)
    # to get the ip addresses that are assigned to the now-running instances
    # and that weren't there before
    return core.find_ec2_instances(stackname)