git-drover: Correctly resolve --parent_checkout

git_drover.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 """git drover: A tool for merging changes to release branches."""
 
 import argparse
 import cPickle
 import functools
 import logging
@@ skipping 209 matching lines @@
 
   def _create_checkout(self):
     """Creates a checkout to use for cherry-picking.
 
     This creates a checkout similarly to git-new-workdir. Most of the .git
     directory is shared with the |self._parent_repo| using symlinks. This
     differs from git-new-workdir in that the config is forked instead of shared.
     This is so the new workdir can be a sparse checkout without affecting
     |self._parent_repo|.
     """
-    parent_git_dir = os.path.abspath(self._run_git_command(
+    parent_git_dir = os.path.join(self._parent_repo, self._run_git_command(
         ['rev-parse', '--git-dir']).strip())
     self._workdir = tempfile.mkdtemp(prefix='drover_%s_' % self._branch)
     logging.debug('Creating checkout in %s', self._workdir)
     git_dir = os.path.join(self._workdir, '.git')
     git_common.make_workdir_common(parent_git_dir, git_dir, self.FILES_TO_LINK,
                                    self.FILES_TO_COPY, mk_symlink)
     self._run_git_command(['config', 'core.sparsecheckout', 'true'])
     with open(os.path.join(git_dir, 'info', 'sparse-checkout'), 'w') as f:
       f.write('/codereview.settings')
 
@@ skipping 174 matching lines @@
       cherry_pick_change(options.branch, options.cherry_pick,
                          options.parent_checkout, options.dry_run,
                          options.verbose)
   except Error as e:
     print 'Error:', e.message
     sys.exit(128)
 
 
 if __name__ == '__main__':
   main()