title: TortoiseHg update fails with "Access is denied", how to work around that?
body: <p>I've pulled in some changes to read-only files from a remote repository and I'm trying to update my working area, but I get <code>[Errno 13] ... Access is denied</code> errors when TortoiseHg tries to update the read-only files.</p>
  
  <p>I'm wondering if there's a command, option, or setting that will solve this problem in the TortoiseHg GUI. I can't seem to updated read-only files from the command line, either, so I'm also interested command-line solutions as well.</p>