$ git clone -n https://gitee.com/wency_cn/postfix_1769679496.git /var/lib/mock/dist-an23-build-509940-75048/root/chroot_tmpdir/scmroot/postfix_1769679496
Cloning into '/var/lib/mock/dist-an23-build-509940-75048/root/chroot_tmpdir/scmroot/postfix_1769679496'...
$ git fetch origin 84800a2de94825a49ddecfa2e82c3e8423730a37:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/postfix_1769679496
 * [new ref]         84800a2de94825a49ddecfa2e82c3e8423730a37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84800a2 Update code from upstream