title: git error when pushing/pulling: unable to open object pack directory (Function not implemented.)
body: <p>I'm using Git Bash on Windows, and using an AFS cell as a remote server. When I try to push or pull, I get the following error message:</p>
  
  <pre><code>error: unable to open object pack directory: ./objects/pack: Function not implemented
  </code></pre>
  
  <p>I get that every time, BUT as far as I can tell the remote is updated correctly otherwise (except for the pack directory). I haven't seen this error before, and it only happens for my repos that use the AFS cell as the remote. I've checked permissions everywhere I can think to check, and I should have full read/write permission locally and on the AFS cell.</p>
  
  <p>One other wrinkle: I also work on an OS X machine, and when performing the same operations with the same repos, I do not see this error.</p>