Restart Mac pref-pane if version mismatch detected

remoting/host/installer/mac/PrivilegedHelperTools/org.chromium.chromoting.me2me.sh

 #!/bin/sh
 
 # 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.
 
 NAME=org.chromium.chromoting
 CONFIG_DIR=/Library/PrivilegedHelperTools
 HOST_EXE=$CONFIG_DIR/$NAME.me2me_host.app/Contents/MacOS/remoting_me2me_host
 PLIST_FILE=$CONFIG_DIR/$NAME.me2me_host.app/Contents/Info.plist
 ENABLED_FILE=$CONFIG_DIR/$NAME.me2me_enabled
 CONFIG_FILE=$CONFIG_DIR/$NAME.json
+PREF_PANE_BUNDLE=/Library/PreferencePanes/$NAME.prefPane
 
 # The exit code returned by 'wait' when a process is terminated by SIGTERM.
 SIGTERM_EXIT_CODE=143
 
 # Range of exit codes returned by the host to indicate that a permanent error
 # has occurred and that the host should not be restarted. Please, keep these
 # constants in sync with remoting/host/constants.h.
 MIN_PERMANENT_ERROR_EXIT_CODE=2
 MAX_PERMANENT_ERROR_EXIT_CODE=4
 
@@ skipping 55 matching lines @@
   rm -f "$ENABLED_FILE"
 elif [[ "$1" = "--enable" ]]; then
   echo $$
   cat > "$CONFIG_FILE"
   touch "$ENABLED_FILE"
 elif [[ "$1" = "--save-config" ]]; then
   echo $$
   cat > "$CONFIG_FILE"
 elif [[ "$1" = "--host-version" ]]; then
   PlistBuddy -c "Print CFBundleVersion" "$PLIST_FILE"
+elif [[ "$1" = "--launch-prefpane" ]]; then

[Jamie, 2012/05/23 01:17:17]

Nit: relaunch-prefpane?

[Lambros, 2012/05/24 00:54:50]

Done.

+  # Wait for the parent (System Preferences applet) to die, by reading from
+  # stdin until the pipe is broken.
+  cat

[Jamie, 2012/05/23 01:17:17]

Yuck :(

Also, we don't currently use "set -e" in this script, but "cat | true" would
make this safe in case we ever did (and this code path could easily be missed
otherwise). I'm assuming here that cat returns an error when the parent quits.
Similarly, you might want to pipe its stderr to /dev/null.

[Lambros, 2012/05/24 00:54:50]

Done.

+  open "$PREF_PANE_BUNDLE"
 elif [[ "$1" = "--run-from-launchd" ]]; then
   run_host
 else
   echo $$
   exit 1
 fi