title: how can I use the dir created by withTempDir in a rule?
body: <p>I need to refer to the directory created by <code>withTempDir</code> by name in the Actions.  I am guessing that the current working directory is changed by <code>withTempDir</code>, and that would likely work in the simple case. However some of the Actions must do their own <code>(Cwd somewhere)</code>.</p>
  
  <p>Is there a way inside an Action to get the full path name of the created temp dir?</p>