Implement DaemonController::GetVersion() method on Linux

remoting/tools/me2me_virtual_host.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 # Virtual Me2Me implementation.  This script runs and manages the processes
 # required for a Virtual Me2Me desktop, which are: X server, X desktop
 # session, and Host process.
 # This script is intended to run continuously as a background daemon
 # process, running under an ordinary (non-root) user account.
@@ skipping 548 matching lines @@
                     help="Stop the daemon currently running.")
   parser.add_option("", "--check-running", dest="check_running", default=False,
                     action="store_true",
                     help="Return 0 if the daemon is running, or 1 otherwise.")
   parser.add_option("", "--reload", dest="reload", default=False,
                     action="store_true",
                     help="Signal currently running host to reload the config.")
   parser.add_option("", "--add-user", dest="add_user", default=False,
                     action="store_true",
                     help="Add current user to the chrome-remote-desktop group.")
+  parser.add_option("", "--host-version", dest="host_version", default=False,
+                    action="store_true",
+                    help="Prints version of the host.")
   (options, args) = parser.parse_args()
 
   host_hash = hashlib.md5(socket.gethostname()).hexdigest()
   pid_filename = os.path.join(CONFIG_DIR, "host#%s.pid" % host_hash)
 
   # Check for a modal command-line option (start, stop, etc.)
   if options.check_running:
     running, pid = PidFile(pid_filename).check()
     return 0 if (running and pid != 0) else 1
 
@@ skipping 13 matching lines @@
     os.kill(pid, signal.SIGHUP)
     return 0
 
   if options.add_user:
     command = ("sudo -k && gksudo --message "
                "\"Please enter your password to enable Chrome Remote Desktop\" "
                "-- sh -c "
                "\"groupadd -f %(group)s && gpasswd --add %(user)s %(group)s\"" %
                { 'group': CHROME_REMOTING_GROUP_NAME,
                  'user': getpass.getuser() })
-    return os.system(command)
+    return os.system(command) >> 8
+
+  if options.host_version:
+    # TODO(sergeyu): Also check RPM package version once we add RPM package.
+    return os.system(locate_executable(HOST_BINARY_NAME) + " --version") >> 8
 
   if not options.start:
     # If no modal command-line options specified, print an error and exit.
     print >> sys.stderr, EPILOG
     return 1
 
   if not options.size:
     options.size = [DEFAULT_SIZE]
 
   sizes = []
@@ skipping 164 matching lines @@
         return 0
       elif os.WEXITSTATUS(status) == 5:
         logging.info("Host domain is blocked by policy - exiting.")
         os.remove(host.config_file)
         return 0
       # Nothing to do for Mac-only status 6 (login screen unsupported)
 
 if __name__ == "__main__":
   logging.basicConfig(level=logging.DEBUG)
   sys.exit(main())