title: --depth=1 option with Google repo
body: <p>I have limited space in my VM, so I am trying to checkout the latest version of the Android source (without the repo history). I did the following:</p>
  
  <pre><code>repo init -u https://android.googlesource.com/platform/manifest -b android-5.1.1_r37 --depth=1
  repo sync -c -j24 -q
  </code></pre>
  
  <p>It seems that the <code>--depth</code> option is not working and the checkout is still more than 6 GB. Is the option still supported?</p>