Enforce cwd for GIT functions

git_try.py

 #!/usr/bin/python
 # Copyright (c) 2011 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.
 """Wrapper for trychange.py for git checkout."""
 
 import logging
 import sys
 
 import breakpad  # pylint: disable=W0611
 
 from scm import GIT
 import subprocess2
 import third_party.upload
 import trychange
 import git_cl
 
 
 def GetRietveldIssueNumber():
   try:
     return GIT.Capture(
-        ['config', 'branch.%s.rietveldissue' % GIT.GetBranch(None)]).strip()
+        ['config', 'branch.%s.rietveldissue' % GIT.GetBranch('.')],
+        '.').strip()
   except subprocess2.CalledProcessError:
     return None
 
 
 def GetRietveldPatchsetNumber():
   try:
     return GIT.Capture(
-        ['config', 'branch.%s.rietveldpatchset' % GIT.GetBranch(None)]).strip()
+        ['config', 'branch.%s.rietveldpatchset' % GIT.GetBranch('.')],
+        '.').strip()
   except subprocess2.CalledProcessError:
     return None
 
 
 def GetRietveldServerUrl():
   try:
-    return GIT.Capture(['config', 'rietveld.server']).strip()
+    return GIT.Capture(['config', 'rietveld.server'], '.').strip()
   except subprocess2.CalledProcessError:
     return None
 
 
 if __name__ == '__main__':
   args = sys.argv[1:]
   patchset = GetRietveldPatchsetNumber()
   if patchset:
     args.extend([
         '--issue', GetRietveldIssueNumber(),
@@ skipping 11 matching lines @@
     sys.exit(trychange.TryChange(
         args, change, swallow_exception=False,
         prog='git try',
         extra_epilog='\n'
                      'git try will diff against your tracked branch and will '
                      'detect your rietveld\n'
                      'code review if you are using git-cl\n'))
   except third_party.upload.ClientLoginError, e:
     print('Got an exception while trying to log in to Rietveld.')
     print(str(e))