$ git clone -n https://gitee.com/wency_cn/python-tornado_1770986519.git /var/lib/mock/dist-an23-build-514576-75110/root/chroot_tmpdir/scmroot/python-tornado_1770986519
Cloning into '/var/lib/mock/dist-an23-build-514576-75110/root/chroot_tmpdir/scmroot/python-tornado_1770986519'...
$ git fetch origin 4e3f69923f03f50ee6265ae259c90b78c15af645:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/python-tornado_1770986519
 * [new ref]         4e3f69923f03f50ee6265ae259c90b78c15af645 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e3f699 Update code from upstream