Catch exception if --adb-key-files file does not exist and log warning.

build/android/provision_devices.py

 #!/usr/bin/env python
 #
 # Copyright (c) 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.
 
 """Provisions Android devices with settings required for bots.
 
 Usage:
   ./provision_devices.py [-d <device serial number>]
@@ skipping 127 matching lines @@
     device: the device to wipe
   """
   device_authorized = device.FileExists(constants.ADB_KEYS_FILE)
   if device_authorized:
     adb_keys = device.ReadFile(constants.ADB_KEYS_FILE,
                                as_root=True).splitlines()
   device.RunShellCommand('wipe data', as_root=True)
   if device_authorized:
     adb_keys_set = set(adb_keys)
     for adb_key_file in options.adb_key_files or []:
-      with open(adb_key_file, 'r') as f:
-        adb_public_keys = f.readlines()
-      adb_keys_set.update(adb_public_keys)
+      try:
+        with open(adb_key_file, 'r') as f:
+          adb_public_keys = f.readlines()
+        adb_keys_set.update(adb_public_keys)
+      except IOError:
+        logging.warning('Unable to find adb keys file %s.' % adb_key_file)
     WriteAdbKeysFile(device, '\n'.join(adb_keys_set))
 
 
 def WipeDeviceIfPossible(device, timeout, options):
   try:
     device.EnableRoot()
     WipeDeviceData(device, options)
     device.Reboot(True, timeout=timeout, retries=0)
   except (errors.DeviceUnresponsiveError, device_errors.CommandFailedError):
     pass
@@ skipping 131 matching lines @@
   parser.add_argument('--adb-key-files', type=str, nargs='+',
                       help='list of adb keys to push to device')
   args = parser.parse_args()
   constants.SetBuildType(args.target)
 
   return ProvisionDevices(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())