$ git clone -n https://gitee.com/YangengLiu/python-tornado.git /var/lib/mock/dist-an23-build-488811-74446/root/chroot_tmpdir/scmroot/python-tornado
Cloning into '/var/lib/mock/dist-an23-build-488811-74446/root/chroot_tmpdir/scmroot/python-tornado'...
$ git fetch origin 20dc9bbb7802f85515a6000c4bf1ee1e8b52dc22:KOJI_FETCH_HEAD
From https://gitee.com/YangengLiu/python-tornado
 * [new ref]         20dc9bbb7802f85515a6000c4bf1ee1e8b52dc22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20dc9bb update version to 6.5.2