def main():
  args = parse_args()

  source_root = os.path.abspath(args.source_root)
  initial_app_path = os.path.join(source_root, args.build_dir)
  app_path = create_app_copy(initial_app_path)

  returncode = 0
  try:
    with scoped_cwd(app_path):
      if args.snapshot_files_dir is None:
        with open(os.path.join(app_path, 'mksnapshot_args')) as f:
          mkargs = f.read().splitlines()
        subprocess.check_call(mkargs + [ SNAPSHOT_SOURCE ], cwd=app_path)
        print('ok mksnapshot successfully created snapshot_blob.bin.')
        context_snapshot = 'v8_context_snapshot.bin'
        if platform.system() == 'Darwin':
          if os.environ.get('TARGET_ARCH') == 'arm64':
            context_snapshot = 'v8_context_snapshot.arm64.bin'
          else:
            context_snapshot = 'v8_context_snapshot.x86_64.bin'
        context_snapshot_path = os.path.join(app_path, context_snapshot)
        gen_binary = get_binary_path('v8_context_snapshot_generator', \
                                    app_path)
        genargs = [ gen_binary, \
                  '--output_file={0}'.format(context_snapshot_path) ]
        subprocess.check_call(genargs)
        print('ok v8_context_snapshot_generator successfully created ' \
              + context_snapshot)
        if args.create_snapshot_only:
          return 0
      else:
        gen_bin_path = os.path.join(args.snapshot_files_dir, '*.bin')
        generated_bin_files = glob.glob(gen_bin_path)
        for bin_file in generated_bin_files:
          shutil.copy2(bin_file, app_path)

      test_path = os.path.join(SOURCE_ROOT, 'spec', 'fixtures', \
                               'snapshot-items-available')

      if sys.platform == 'darwin':
        bin_files = glob.glob(os.path.join(app_path, '*.bin'))
        app_dir = os.path.join(app_path, '{0}.app'.format(PRODUCT_NAME))
        electron = os.path.join(app_dir, 'Contents', 'MacOS', PRODUCT_NAME)
        bin_out_path = os.path.join(app_dir, 'Contents', 'Frameworks',
                  '{0} Framework.framework'.format(PROJECT_NAME),
                  'Resources')
        for bin_file in bin_files:
          shutil.copy2(bin_file, bin_out_path)
      elif sys.platform == 'win32':
        electron = os.path.join(app_path, '{0}.exe'.format(PROJECT_NAME))
      else:
        electron = os.path.join(app_path, PROJECT_NAME)

      subprocess.check_call([electron, test_path])
      print('ok successfully used custom snapshot.')
  except subprocess.CalledProcessError as e:
    print('not ok an error was encountered while testing mksnapshot.')
    print(e)
    returncode = e.returncode
  except KeyboardInterrupt:
    print('Other error')
    returncode = 0
  print('Returning with error code: {0}'.format(returncode))
  return returncode