title: How to use remote git-repos for git clone --reference
body: <p>I want to speed up cloning of some git-repos in my network using a cache.
  I set up the repo and run git-daemon.</p>
  
  <p>Now I can call</p>
  
  <pre><code>git clone git://my_ip/my_repo
  </code></pre>
  
  <p>What fails though is</p>
  
  <pre><code>git clone --reference git://my_ip/my_repo git://github.com/my_repo.git
  </code></pre>
  
  <p>with</p>
  
  <pre><code>fatal: path 'git://my_ip/my_repo' does not exist
  </code></pre>
  
  <p>Is there a way to use remote repositories for <code>--reference</code>?
  Or do I need the reference locally?</p>