title: How to git diff remote branches and specify the repository at the same time?
body: <p>I have a <code>develop</code> branch and a <code>master</code> branch.  I want to get the differences between the two on a box where I've never cloned any repos.  So I tried:</p>
  
  <pre><code>git diff --no-index remotes/origin/master remotes/origin/develop
  </code></pre>
  
  <p>It tells me <code>error: Could not access 'remotes/origin/master'</code>, which is fair enough since it doesn't know what repo to get it from.  </p>
  
  <p>So how do I tell git the location of the repository, so that I could get the diff? </p>