IsDoNotRetryError returns true if the error is caused by DoNotRetry error, and the transfer should not be retried.

NewLayerDownloadManager returns a new LayerDownloadManager.

NewLayerUploadManager returns a new LayerUploadManager.

WithMaxDownloadAttempts configures the maximum number of download attempts for a download manager.

DoNotRetry is an error wrapper indicating that the error cannot be resolved with a retry.

LayerDownloadManager figures out which layers need to be downloaded, then registers and downloads those, taking into account dependencies between layers.

LayerUploadManager provides task management and progress reporting for uploads.

DigestRegisterer can be implemented by a DownloadDescriptor, and provides a Registered method which gets called after a downloaded layer is registered.

A DownloadDescriptor references a layer that may need to be downloaded.

An UploadDescriptor references a layer that may need to be uploaded.

DownloadOption set options for the LayerDownloadManager.