Only send email notification when device_status_check failed on buildbot.

build/android/buildbot/bb_device_status_check.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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.
 
 """A class to keep track of devices across builds and report state."""
 import logging
 import optparse
 import os
@@ skipping 122 matching lines @@
 
   try:
     last_missing_devices = device_list.GetPersistentDeviceList(
         last_missing_devices_path)
   except IOError:
     last_missing_devices = []
 
   missing_devs = list(set(last_devices) - set(adb_online_devs))
   new_missing_devs = list(set(missing_devs) - set(last_missing_devices))
 
-  if new_missing_devs:
+  if new_missing_devs and os.environ.get('BUILDBOT_SLAVENAME'):
     logging.info('new_missing_devs %s' % new_missing_devs)
     devices_missing_msg = '%d devices not detected.' % len(missing_devs)
     bb_annotations.PrintSummaryText(devices_missing_msg)
 
     from_address = 'chrome-bot@chromium.org'
     to_addresses = ['zty@chromium.org']
-    subject = 'Devices offline on %s' % os.environ.get('BUILDBOT_SLAVENAME')
+    subject = 'Devices offline on %s, %s, %s' % (
+      os.environ.get('BUILDBOT_SLAVENAME'),
+      os.environ.get('BUILDBOT_BUILDERNAME'),
+      os.environ.get('BUILDBOT_BUILDNUMBER'))
     msg = ('Please reboot the following devices:\n%s' %
            '\n'.join(map(str,new_missing_devs)))
     SendEmail(from_address, to_addresses, subject, msg)
 
   all_known_devices = list(set(adb_online_devs) | set(last_devices))
   device_list.WritePersistentDeviceList(last_devices_path, all_known_devices)
   device_list.WritePersistentDeviceList(last_missing_devices_path, missing_devs)
 
   if not all_known_devices:
     # This can happen if for some reason the .last_devices file is not
@@ skipping 200 matching lines @@
     # devices with critically low battery. Remove those devices from testing,
     # allowing build to continue with good devices.
     return 2
 
   if not devices:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())