$ git clone -n https://gitee.com/wency_cn/python-tornado.git /var/lib/mock/dist-an23-build-503616-74854/root/chroot_tmpdir/scmroot/python-tornado
Cloning into '/var/lib/mock/dist-an23-build-503616-74854/root/chroot_tmpdir/scmroot/python-tornado'...
$ git fetch origin b351ed4e7b4d8b1fb68edce525712b73074e677e:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/python-tornado
 * [new ref]         b351ed4e7b4d8b1fb68edce525712b73074e677e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b351ed4 Update code from upstream