title: How do I keep an svn:external up to date using git-svn?
body: <p>Treating my repository as a SVN repo, I get:</p>
  
  <pre><code>svn co http://myrepo/foo/trunk foo
  ...
  foo/
    bar/
    baz/ -&gt; http://myrepo/baz/trunk
  </code></pre>
  
  <p>Treating it as a Git repo, I get:</p>
  
  <pre><code>git svn clone http://myrepo/foo --trunk=trunk --branches=branches --tags=tags
  ...
  foo/
    bar/
  </code></pre>
  
  <p>I can clone baz to my local machine elsewhere and add a symlink, but that's just a hack.  Is there a way to have <code>git svn rebase</code> automatically pull in those changes when it updates everything else, just like <code>svn up</code> does?</p>