docker_django_management.py 文件源码

def execute_from_command_line(argv):  # type: (List[str]) -> None
    '''
    This is like django.core.management.execute_from_command_line,
    but if the django package is unavailable, the script executes itself
    inside a docker container, where the django package is assumed
    to be available.

    Ultimately, this allows developers to use manage.py from their host
    system without needing to prefix all of their commands with
    'docker-compose run <container name>'.
    '''

    is_runserver = len(argv) > 1 and argv[1] == 'runserver'

    if IS_RUNNING_IN_DOCKER:
        if is_runserver:
            setup_docker_sigterm_handler()
        wait_for_db()

        if 'PYTHONUNBUFFERED' not in os.environ:
            warn("PYTHONUNBUFFERED is not defined. Some output may "
                 "not be visible.")

    try:
        from django.core.management import execute_from_command_line
    except ImportError as e:
        if not CONTAINER_NAME:
            raise e
        # Assume the user wants to run us in docker.
        if is_runserver:
            # Even with --service-ports, by default runserver only exposes
            # itself on 127.0.0.1, which docker can't expose to the
            # host through its networking stack. It's easiest to just
            # tell the developer to use 'docker-compose up' instead.
            warn("You should probably be using 'docker-compose up' "
                 "to run the server.")
        try:
            cmd_name = 'docker-compose'
            cmd_args = [
                cmd_name, 'run', CONTAINER_NAME, 'python'
            ] + argv

            if sys.platform == 'win32':
                # Windows doesn't support the exec() syscall,
                # so run docker-compose in a subshell.
                # This will allow stdio to work as expected.
                return_code = subprocess.call(cmd_args)
                sys.exit(return_code)
            else:
                os.execvp(cmd_name, cmd_args)
        except OSError:
            # Apparently docker-compose isn't installed, so just raise
            # the original ImportError.
            raise e

    execute_from_command_line(argv)