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+# Copyright 2008 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Main program for Gerrit.
+
+This is also a template for running a Django app under Google App
+Engine, especially when using a newer version of Django than provided
+in the App Engine standard library.
+
+The site-specific code is all in other files: urls.py, models.py,
+views.py, settings.py.
+"""
+
+# Standard Python imports.
+import os
+import sys
+import logging
+
+# Log a message each time this module get loaded.
+logging.info('Loading %s, app version = %s',
+             __name__, os.getenv('CURRENT_VERSION_ID'))
+
+# Delete the preloaded copy of Django.
+for key in [key for key in sys.modules if key.startswith('django')]:
+  del sys.modules[key]
+
+# Force sys.path to have our own directory first, so we can import from it.
+sys.path.insert(0, os.path.abspath(os.path.dirname(__file__)))
+sys.path.insert(0, os.path.abspath('django.zip'))
+sys.path.insert(0, os.path.abspath('froofle.zip'))
+sys.path.insert(0, os.path.abspath('codereview.zip'))
+
+# Fail early if we can't import Django.  Log identifying information.
+import django
+logging.info('django.__file__ = %r, django.VERSION = %r',
+             django.__file__, django.VERSION)
+assert django.VERSION[0] >= 1,"This Django version is too old"
+
+# AppEngine imports.
+from google.appengine.ext.webapp import util
+
+# Helper to enter the debugger.  This passes in __stdin__ and
+# __stdout__, because stdin and stdout are connected to the request
+# and response streams.  You must import this from __main__ to use it.
+# (I tried to make it universally available via __builtin__, but that
+# doesn't seem to work for some reason.)
+def BREAKPOINT():
+  import pdb
+  p = pdb.Pdb(None, sys.__stdin__, sys.__stdout__)
+  p.set_trace()
+
+# Custom Django configuration.
+from django.conf import settings
+settings._target = None
+os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'
+
+# Import various parts of Django.
+import django.core.handlers.wsgi
+import django.core.signals
+import django.db
+import django.dispatch.dispatcher
+import django.forms
+
+# Work-around to avoid warning about django.newforms in djangoforms.
+django.newforms = django.forms
+
+def log_exception(*args, **kwds):
+  """Django signal handler to log an exception."""
+  cls, err = sys.exc_info()[:2]
+  logging.exception('Exception in request: %s: %s', cls.__name__, err)
+
+# Log all exceptions detected by Django.
+django.core.signals.got_request_exception.connect(log_exception)
+
+# Unregister Django's default rollback event handler.
+django.core.signals.got_request_exception.disconnect(
+    django.db._rollback_on_exception)
+
+correct_path = None
+def real_main():
+  """Main program.
+  """
+  global correct_path
+
+  if correct_path is None:
+    correct_path = list(sys.path)
+  else:
+    sys.path[:] = correct_path
+
+  application = django.core.handlers.wsgi.WSGIHandler()
+  util.run_wsgi_app(application)
+
+def profile_main():
+  """Main program for profiling.
+  """
+  import cProfile, pstats, StringIO
+  prof = cProfile.Profile()
+  prof = prof.runctx('real_main()', globals(), locals())
+  stream = StringIO.StringIO()
+  stats = pstats.Stats(prof, stream=stream)
+  # stats.strip_dirs()  # Don't; too many modules are named __init__.py.
+  stats.sort_stats('time')  # 'time', 'cumulative' or 'calls'
+  stats.print_stats()  # Optional arg: how many to print
+  # The rest is optional.
+  # stats.print_callees()
+  # stats.print_callers()
+  print '\n<hr>'
+  print '<h1>Profile</h1>'
+  print '<pre>'
+  print stream.getvalue()[:1000000]
+  print '</pre>'
+
+# Set this to profile_main to enable profiling.
+main = real_main
+
+if __name__ == '__main__':
+  main()