code: function(cb) {
              log.log('git fetch origin ' + repoDir);
              git(repoDir, ['fetch', 'origin'], function(err, stdout, stderr) {
                  if (err) {
                      log.error('Unable to fetch at ' + repoDir + ':', err.msg);
                  }
                  cb(null, {fetch: {stdout: stdout, stderr: stderr}})
              });
          }
docs: Fetch to update the latest remote state of the repo.