def _update_progress_bar(self):
        # type: (Downloader) -> None
        """Update progress bar
        :param Downloader self: this
        """
        blobxfer.operations.progress.update_progress_bar(
            self._general_options,
            'download',
            self._download_start_time,
            self._download_total,
            self._download_sofar,
            self._download_bytes_total,
            self._download_bytes_sofar,
        )
Update progress bar
        :param Downloader self: this