Disable Me2Me host controls on unsupported Linux systems.

remoting/tools/me2me_virtual_host.py

Index: remoting/tools/me2me_virtual_host.py
diff --git a/remoting/tools/me2me_virtual_host.py b/remoting/tools/me2me_virtual_host.py
index c1eaa99b7cb9a59de5b2b79660e60c7014f5e7dd..38423251bbfca516645069b0b88363c09d6a83b2 100755
--- a/remoting/tools/me2me_virtual_host.py
+++ b/remoting/tools/me2me_virtual_host.py
@@ -52,8 +52,9 @@ else:
 
 CHROME_REMOTING_GROUP_NAME = "chrome-remote-desktop"
 
-CONFIG_DIR = os.path.expanduser("~/.config/chrome-remote-desktop")
 HOME_DIR = os.environ["HOME"]
+CONFIG_DIR = HOME_DIR + "/.config/chrome-remote-desktop"
+SESSION_FILE_PATH = HOME_DIR + "/.chrome-remote-desktop-session"
 
 X_LOCK_FILE_TEMPLATE = "/tmp/.X%d-lock"
 FIRST_X_DISPLAY_NUMBER = 20
@@ -75,6 +76,29 @@ MAX_LAUNCH_FAILURES = SHORT_BACKOFF_THRESHOLD + 10
 g_desktops = []
 g_host_hash = hashlib.md5(socket.gethostname()).hexdigest()
 
+def load_lsb_release_file():
+  result = {}
+  try:
+    for line in open('/etc/lsb-release').readlines():
+      parts = (line.split('#', 2)[0]).split('=', 2)
+      if len(parts) == 2:
+        result[parts[0].strip()] = parts[1].strip()
+  except IOError as e:
+    logging.error('Failed to load /etc/lsb-release: ' + str(e))
+  return result
+
+def is_supported_platform():
+  # Always assume that the system is supported if the config directory or
+  # session file exist.
+  if os.path.isdir(CONFIG_DIR) or os.path.isfile(SESSION_FILE_PATH):
+    return True
+
+  # Currently the host supports only Goobuntu.
+  # TODO(sergeyu): Try other versions of Ubuntu and enable them here.
+  lsb_release = load_lsb_release_file()
+  return (lsb_release.has_key('GOOGLE_CODENAME') and
+      lsb_release['GOOGLE_CODENAME'] == 'precise')
+
 class Config:
   def __init__(self, path):
     self.path = path
@@ -502,7 +526,7 @@ def choose_x_session():
   # session instead of looking for custom .xsession files in the home directory.
   # So it's necessary to test for these files here.
   XSESSION_FILES = [
-    "~/.chrome-remote-desktop-session",
+    SESSION_FILE_PATH,
     "~/.xsession",
     "~/.Xsession" ]
   for startup_file in XSESSION_FILES:
@@ -902,6 +926,9 @@ Web Store: https://chrome.google.com/remotedesktop"""
   parser.add_option("-k", "--stop", dest="stop", default=False,
                     action="store_true",
                     help="Stop the daemon currently running.")
+  parser.add_option("", "--get-status", dest="get_status", default=False,
+                    action="store_true",
+                    help="Prints host status")
   parser.add_option("", "--check-running", dest="check_running", default=False,
                     action="store_true",
                     help="Return 0 if the daemon is running, or 1 otherwise.")
@@ -923,6 +950,19 @@ Web Store: https://chrome.google.com/remotedesktop"""
     options.config = os.path.join(CONFIG_DIR, "host#%s.json" % g_host_hash)
 
   # Check for a modal command-line option (start, stop, etc.)
+
+  if options.get_status:
+    pid = get_daemon_pid()
+    if pid != 0:
+      print "STARTED"
+    elif is_supported_platform():
+      print "STOPPED"
+    else:
+      print "NOT_IMPLEMENTED"
+    return 0
+
+  # TODO(sergeyu): Remove --check-running once NPAPI plugin and NM host are
+  # updated to always use get-status flag instead.
   if options.check_running:
     pid = get_daemon_pid()
     return 0 if pid != 0 else 1