Changes to annotated step scripts: dart-editor-installer-* builders will build installer

tools/utils.py

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import os
 import platform
@@ skipping 444 matching lines @@
     self._temp_dir = None
     self._prefix = prefix
 
   def __enter__(self):
     self._temp_dir = tempfile.mkdtemp(self._prefix)
     return self._temp_dir
 
   def __exit__(self, *_):
     shutil.rmtree(self._temp_dir, ignore_errors=True)
 
+class ChangedWorkingDirectory(object):
+  def __init__(self, working_directory):
+    self._working_directory = working_directory
+
+  def __enter__(self):
+    self._old_cwd = os.getcwd()
+    print "Enter directory = ", self._working_directory
+    os.chdir(self._working_directory)
+
+  def __exit__(self, *_):
+    print "Enter directory = ", self._old_cwd
+    os.chdir(self._old_cwd)
+
 
 if __name__ == "__main__":
   import sys
   Main(sys.argv)