title: Git rebase got 'unlink of file failed' error
body: <p>Using <strong>msysgit 1.7.0.2</strong>, when doing <code>git rebase -i</code>, it hangs and there's no message.<br>
  After enter <kbd>ctrl+c</kbd>, I can see </p>
  
  <pre><code>'unlink of file failed, should I try again (y/n)?'
  </code></pre>
  
  <p>Then I tried <code>git rebase --abort</code> but got same error message. So now it's stuck in the middle of rebase process. This error seems to be caused by read-only file.</p>
  
  <p>Is there any way to resolve this issue?</p>