Fix some path processing to work better on Windows.

repo

 #!/usr/bin/env python
 
 ## repo default configuration
 ##
 REPO_URL='https://chromium.googlesource.com/external/repo'
 REPO_REV='stable'
 
 # Copyright (C) 2008 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 215 matching lines @@
 if ver[0] == 3:
   _print('warning: Python 3 support is currently experimental. YMMV.\n'
          'Please use Python 2.6 - 2.7 instead.',
          file=sys.stderr)
 if (ver[0], ver[1]) < MIN_PYTHON_VERSION:
   _print('error: Python version %s unsupported.\n'
          'Please use Python 2.6 - 2.7 instead.'
          % sys.version.split(' ')[0], file=sys.stderr)
   sys.exit(1)
 
-home_dot_repo = os.path.expanduser('~/.repoconfig')
+home_dot_repo = os.path.expanduser(os.path.join('~','.repoconfig'))
 gpg_dir = os.path.join(home_dot_repo, 'gnupg')
 
 extra_args = []
 init_optparse = optparse.OptionParser(usage="repo init -u url [options]")
 
 # Logging
 group = init_optparse.add_option_group('Logging options')
 group.add_option('-q', '--quiet',
                  dest="quiet", action="store_true", default=False,
                  help="be quiet")
@@ skipping 607 matching lines @@
   try:
     os.execv(sys.executable, me)
   except OSError as e:
     _print("fatal: unable to start %s" % repo_main, file=sys.stderr)
     _print("fatal: %s" % e, file=sys.stderr)
     sys.exit(148)
 
 
 if __name__ == '__main__':
   main(sys.argv[1:])