devserver: start using payload scripts bundled with devserver

buildutil.py

 # Copyright (c) 2009-2010 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.
 
+import os, sys
+
 class BuildObject(object):
   """
     Common base class that defines key paths in the source tree.
   """
   def __init__(self, root_dir, static_dir):
-    self.app_id = "87efface-864d-49a5-9bb3-4b050a7c227a"
+    self.app_id = '87efface-864d-49a5-9bb3-4b050a7c227a'
     self.root_dir = root_dir
-    self.scripts_dir = "%s/scripts" % self.root_dir
+    self.scripts_dir = '%s/src/scripts' % os.environ['CROS_WORKON_SRCROOT']
+    self.devserver_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
     self.static_dir = static_dir
-    self.x86_pkg_dir = "%s/build/x86/local_packages" % self.root_dir
+    self.x86_pkg_dir = '%s/build/x86/local_packages' % self.root_dir
 
-  def AssertSystemCallSuccess(self, err, cmd="unknown"):
+  def AssertSystemCallSuccess(self, err, cmd='unknown'):
     """
       TODO(rtc): This code should probably live somewhere else.
     """
     if err != 0:
-      raise Exception("%s failed to execute" % cmd)
+      raise Exception('%s failed to execute' % cmd)