code: function (options) {
    var git_repo_path = ((options && options['gcwd']) || process.cwd()) + '/.git';
  
    return fs.statAsync(git_repo_path)
      .call('isDirectory')
      .then(function (exist) {
        return exist && git_repo_path
      })
  }
docs: get git_repo pathname, default: process.cwd() + '/.git'