Fix some path processing to work better on Windows.

gerrit_util.py

 # Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Utilities for requesting information for a gerrit server via https.
 
 https://gerrit-review.googlesource.com/Documentation/rest-api.html
 """
 
@@ skipping 79 matching lines @@
   """Authenticator implementation that uses ".netrc" for token.
   """
 
   def __init__(self):
     self.netrc = self._get_netrc()
     self.gitcookies = self._get_gitcookies()
 
   @staticmethod
   def _get_netrc():
     path = '_netrc' if sys.platform.startswith('win') else '.netrc'
-    path = os.path.join(os.environ['HOME'], path)
+    path = os.path.expanduser(os.path.join('~', path))
     try:
       return netrc.netrc(path)
     except IOError:
       print >> sys.stderr, 'WARNING: Could not read netrc file %s' % path
       return netrc.netrc(os.devnull)
     except netrc.NetrcParseError as e:
       st = os.stat(e.path)
       if st.st_mode & (stat.S_IRWXG | stat.S_IRWXO):
         print >> sys.stderr, (
             'WARNING: netrc file %s cannot be used because its file '
@@ skipping 494 matching lines @@
         username = review.get('email', jmsg.get('name', ''))
         raise GerritError(200, 'Unable to set %s label for user "%s"'
                        ' on change %s.' % (label, username, change))
   jmsg = GetChangeCurrentRevision(host, change)
   if not jmsg:
     raise GerritError(
         200, 'Could not get review information for change "%s"' % change)
   elif jmsg[0]['current_revision'] != revision:
     raise GerritError(200, 'While resetting labels on change "%s", '
                    'a new patchset was uploaded.' % change)