anchor.diff:        args.add('--migrate');
       }
       args.add('-q');
  -    final pr = await Process.run('gcloud', args);
  +    final pr = await _runGCloudApp(args);
       if (pr.exitCode != 0) {
         print('[ERR] Couldn\'t migrate traffic for $service.');
         print(pr.stderr);
  
positive.code: 
    Future _migrateTraffic() async {
      final List<String> args = [
        'app',
        'services',
        'set-traffic',
        service,
  
negative.code: 
    Future _gcloudDeploy() async {
      final String yamlFile = service == 'default' ? 'app.yaml' : '$service.yaml';
      final pr = await _runGCloudApp(
        ['deploy', yamlFile, '--no-promote', '-v', newVersion, '-q'],
      );
      if (pr.exitCode != 0) {
        print('[ERR] Couldn\'t deploy $service.');
  