title: how to make jenkins use an already checked out codebase?
body: <p>I am just starting with <code>Jenkins 1.487</code> and wanted to integrate Jenkins in my Ant project. But while configuring it, I can't find any way to make Jenkins re-use an already checked out codebase, instead of downloading a fresh copy relative to its workspace root. Is there a way to do that ?</p>
  
  <p>I tried to specify a custom workspace manually (where my codebase was already checked out), and clicked on 'Build now'. The result was that it wiped out my current checked out code saying </p>
  
  <pre><code>"Checking out a fresh workspace because there's no workspace at /home/daud/Work
  Cleaning local Directory ."
  </code></pre>
  
  <p>Not even a warning.. </p>