}
			publishContext = c.publishContext
		}

	default:
		return fmt.Errorf("volume source not found in volume.Spec")
	}

	// create target_dir before call to NodePublish
	parentDir := filepath.Dir(dir)
	if err := os.MkdirAll(parentDir, 0750); err != nil {
		return errors.New(log("mounter.SetUpAt failed to create dir %#v:  %v", parentDir, err))
	}

		object := oi.objectName

		queries := url.Values{}
		queries.Add("partNumber", strconv.Itoa(partNumber))
		targetURL := makeTestTargetURL("", bucketName, object, queries)
		req, err := newTestSignedRequestV4(http.MethodGet, targetURL,
			0, nil, credentials.AccessKey, credentials.SecretKey, oi.metaData)
		if err != nil {