title: Why does git not recognize "origin/master" as a valid object name?
body: <pre><code>~/www&gt; git branch --track live origin/master
  fatal: Not a valid object name: 'origin/master'.
  ~/www&gt; git remote
  origin
  ~/www&gt; git branch
  * master
    test_branch
    working_branch
  </code></pre>
  
  <p>I also tried creating a tracking branch with:</p>
  
  <pre><code>git branch live
  git branch --set-upstream live origin/master
  </code></pre>
  
  <p>but I got the same error</p>