Skipped syncing svn working copy which has a .hg subdirectory....

gclient_scm.py

 # Copyright (c) 2010 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 663 matching lines @@
         filter_fn=DiffFilterer(self.relpath).Filter)
 
   def update(self, options, args, file_list):
     """Runs svn to update or transparently checkout the working copy.
 
     All updated files will be appended to file_list.
 
     Raises:
       Error: if can't get URL for relative path.
     """
-    # Only update if git is not controlling the directory.
+    # Only update if git or hg is not controlling the directory.
     git_path = os.path.join(self.checkout_path, '.git')
     if os.path.exists(git_path):
       print('________ found .git directory; skipping %s' % self.relpath)
       return
 
+    hg_path = os.path.join(self.checkout_path, '.hg')
+    if os.path.exists(hg_path):
+      print('________ found .hg directory; skipping %s' % self.relpath)
+      return
+
     if args:
       raise gclient_utils.Error("Unsupported argument(s): %s" % ",".join(args))
 
     # revision is the revision to match. It is None if no revision is specified,
     # i.e. the 'deps ain't pinned'.
     url, revision = gclient_utils.SplitUrlRevision(self.url)
     # Keep the original unpinned url for reference in case the repo is switched.
     base_url = url
     if options.revision:
       # Override the revision number.
@@ skipping 222 matching lines @@
 
     This method returns a new list to be used as a command."""
     new_command = command[:]
     if revision:
       new_command.extend(['--revision', str(revision).strip()])
     # --force was added to 'svn update' in svn 1.5.
     if ((options.force or options.manually_grab_svn_rev) and
         scm.SVN.AssertVersion("1.5")[0]):
       new_command.append('--force')
     return new_command