Pre-generate updates with root user.

bin/cros_au_test_harness.py

 #!/usr/bin/python
 
 # Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This module runs a suite of Auto Update tests.
 
   The tests can be run on either a virtual machine or actual device depending
   on parameters given.  Specific tests can be run by invoking --test_prefix.
@@ skipping 694 matching lines @@
   This method effectively pre-generates the dev server cache for all tests.
 
   Args:
     parser: parser from main.
     options: options from parsed parser.
   Returns:
     Array of output from generating updates.
   """
   def _GenerateVMUpdate(target, src):
     """Generates an update using the devserver."""
-    RunCommand(['./start_devserver',
+    RunCommand(['sudo',
+                './start_devserver',
                 '--pregenerate_update',
                 '--exit',
                 '--image=%s' % target,
                 '--src_image=%s' % src,
                 '--for_vm'
-               ])
+               ], enter_chroot=True)
 
   # Get the list of deltas by mocking out update method in test class.
   GenerateVirtualAUDeltasTest.ProcessOptions(parser, options)
   test_loader = unittest.TestLoader()
   test_loader.testMethodPrefix = options.test_prefix
   test_suite = test_loader.loadTestsFromTestCase(GenerateVirtualAUDeltasTest)
   test_result = unittest.TextTestRunner(verbosity=0).run(test_suite)
 
   Info('The following delta updates are required.')
   jobs = []
@@ skipping 57 matching lines @@
   test_loader = unittest.TestLoader()
   test_loader.testMethodPrefix = options.test_prefix
   test_suite = test_loader.loadTestsFromTestCase(test_class)
   test_result = unittest.TextTestRunner(verbosity=2).run(test_suite)
   if not test_result.wasSuccessful():
     Die('Test harness was not successful.')
 
 
 if __name__ == '__main__':
   main()