Pass chroot flag into enter_chroot.

src/scripts/autotest

 #!/usr/bin/python
 
 # Copyright (c) 2010 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.
 #
 # A python wrapper to call autotest ebuild.
 
 import commands, logging, optparse, os, subprocess, sys
 
 
 def run(cmd):
   return subprocess.call(cmd, stdout=sys.stdout, stderr=sys.stderr)
 
 
-class MyOptionPaser(optparse.OptionParser):
+class MyOptionParser(optparse.OptionParser):
   """Override python's builtin OptionParser to accept any undefined args."""
 
   help = False
 
   def _process_args(self, largs, rargs, values):
     # see /usr/lib64/python2.6/optparse.py line 1414-1463
     while rargs:
       arg = rargs[0]
       # We handle bare "--" explicitly, and bare "-" is handled by the
       # standard arg handler since the short arg case ensures that the
@@ skipping 15 matching lines @@
         except optparse.BadOptionError:
           largs.append(arg)
       elif self.allow_interspersed_args:
         largs.append(arg)
         del rargs[0]
       else:
         return                  # stop now, leave this arg in rargs
 
   def print_help(self, file=None):
     optparse.OptionParser.print_help(self, file)
-    MyOptionPaser.help = True
+    MyOptionParser.help = True
 
 
-parser = MyOptionPaser()
+parser = MyOptionParser()
 parser.allow_interspersed_args = True
 
 DEFAULT_BOARD = os.environ.get('DEFAULT_BOARD', '')
 
 parser.add_option('--autox', dest='autox', action='store_true',
                   default=True,
                   help='Build autox along with autotest [default].')
 parser.add_option('--noautox', dest='autox', action='store_false',
                   help='Don\'t build autox along with autotest.')
 parser.add_option('--board', dest='board', action='store',
@@ skipping 22 matching lines @@
     pass
 
   sys_exit = sys.exit
   sys.exit = nop
   options, args = parser.parse_args()
   sys.exit = sys_exit
 
   if not args and not options.build:
     parser.print_help()
 
-  if MyOptionPaser.help:
+  if MyOptionParser.help:
     if options.build:
       print
       print 'Options inherited from autotest_client, which is used in build',
       print 'only mode.'
       run([AUTOTEST_CLIENT, '--help'])
     else:
       print
       print 'Options inherited from autoserv:'
       run([AUTOSERV, '--help'])
     sys.exit(0)
@@ skipping 104 matching lines @@
       die(common_sh, 'build_autotest failed.')
   else:
     ssh_key_file = os.path.join(os.path.dirname(me),
                                 'mod_for_test_scripts/ssh_keys/testing_rsa')
     os.chmod(ssh_key_file, 0400)
     run_autoserv(options.board, args)
 
 
 if __name__ == '__main__':
   main()