docker_session_.py 文件源码

def _manifest_exists(self, image):
    """Check the remote for the given manifest by digest."""
    # GET the manifest by digest, and check for 200
    resp, unused_content = self._transport.Request(
        '{base_url}/manifests/{digest}'.format(
            base_url=self._base_url(), digest=image.digest()),
        method='GET',
        accepted_codes=[httplib.OK, httplib.NOT_FOUND],
        accepted_mimes=[image.media_type()])

    return resp.status == httplib.OK  # pytype: disable=attribute-error