title: git svn clone results in empty directory
body: <p>I have an svn repository with project structure:</p>
  
  <pre><code>/root/projectA/trunk
  /root/projectA/branches
  /root/projectA/tags
  
  /root/projectB/trunk
  /root/projectB/branches
  /root/projectB/tags 
  </code></pre>
  
  <p>I want to clone projectA.  When I run:</p>
  
  <pre><code>git svn clone -r &lt;revision number&gt;:HEAD &lt;url&gt;/root/projectA
  </code></pre>
  
  <p>I get no errors and a git repository is created under the new projectA directory.  However the directory is empty.  Am I missing soemthing?</p>