title: Google Cloud Storage Transfer Sink Prefix
body: <p>I've scanned the Storage Transfer docs, but I'm not seeing an example of this scenario. For reference, I'm using this script - <a href="https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/storage/transfer_service/nearline_request.py" rel="nofollow noreferrer">https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/storage/transfer_service/nearline_request.py</a></p>
  <p>Is there a way to set a prefix for files being transferred from the source bucket to the sink bucket?</p>
  <p>For example, if I have this file in the source bucket:<br />
  <code>gs://source_bucket/myFile.csv</code><br />
  I want to add a prefix to it so that it looks like this in the sink bucket:<br />
  <code>gs://sink_bucket/date/type/myFile.csv</code></p>
  <p>As far as I can tell, the sink bucket argument only accepts a bucket's name. I'm not seeing an option for something like this in the <code>transferSpec</code> docs either. Any help would be most appreciated.</p>