def _get_extras_hash(self):
    gab_args = self._get_gab_args()
    gab_args.append('-print_extras_hash')
    gab_args.extend(self._go_file_to_mtime)

    gab_process = safe_subprocess.start_process(gab_args,
                                                stdout=subprocess.PIPE,
                                                stderr=subprocess.PIPE,
                                                env={})
    gab_stdout, gab_stderr = gab_process.communicate()
    if gab_process.returncode:
      raise BuildError(
          '%s\n\n(Executed command: %s)' % (gab_stderr,
                                            ' '.join(gab_args)))
    else:
      return gab_stdout
test list networks.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/devappserver2/go_application.py/GoApplication._get_extras_hash--crossover with--dataset/ETHPy150Open saltstack/salt/tests/unit/modules/dockerng_test.py/DockerngTestCase.test_list_networks