title: Error when cloning git "shallow" repository
body: <p>I'm getting the following error when issuing the command <code>git clone --bare /path/to/repo</code>:</p>
  
  <p><code>fatal: attempt to fetch/clone from a shallow repository</code></p>
  
  <p>First, what is a shallow repository and why doesn't it let me clone it?</p>