Need to run git cache exists in a directory we know for sure that exists

gclient_scm.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Gclient-specific SCM-specific operations."""
 
 import logging
 import os
 import posixpath
 import re
@@ skipping 667 matching lines @@
 
     If no cache-dir is specified, just return |url| unchanged.
     """
     if not self.cache_dir:
       return url
     v = ['-v'] if options.verbose else []
     self._Run(['cache', 'populate'] + v +
               ['--shallow', '--cache-dir', self.cache_dir, url],
               options, cwd=self._root_dir, retry=True)
     return self._Run(['cache', 'exists', '--cache-dir', self.cache_dir, url],
-                     options).strip()
+                     options, cwd=self._root_dir, ).strip()
 
   def _Clone(self, revision, url, options):
     """Clone a git repository from the given URL.
 
     Once we've cloned the repo, we checkout a working branch if the specified
     revision is a branch head. If it is a tag or a specific commit, then we
     leave HEAD detached as it makes future updates simpler -- in this case the
     user should first create a new branch or switch to an existing branch before
     making changes in the repo."""
     if not options.verbose:
@@ skipping 702 matching lines @@
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'theirs-conflict'))
     elif options.manually_grab_svn_rev:
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'postpone'))
     elif command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
       new_command.extend(('--accept', 'postpone'))
     return new_command