$ git clone -n https://gitee.com/wency_cn/python-tornado_1767838783.git /var/lib/mock/dist-an23-build-504990-74854/root/chroot_tmpdir/scmroot/python-tornado_1767838783
Cloning into '/var/lib/mock/dist-an23-build-504990-74854/root/chroot_tmpdir/scmroot/python-tornado_1767838783'...
$ git fetch origin bb632627a71a64bc6edfa65498cb634bfe98373b:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/python-tornado_1767838783
 * [new ref]         bb632627a71a64bc6edfa65498cb634bfe98373b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb63262 Update code from upstream