def require_completion(f):
    """This make sure that the image push correctly finished."""
    @functools.wraps(f)
    def wrapper(*args, **kwargs):
        if store.exists(store.image_mark_path(kwargs['image_id'])):
            return toolkit.api_error('Image is being uploaded, retry later')
        return f(*args, **kwargs)
    return wrapper
This make sure that the image push correctly finished.
docker_registry/images.py