$ git clone -n https://gitee.com/wency_cn/postfix_1770768577.git /var/lib/mock/dist-an23-build-513363-75099/root/chroot_tmpdir/scmroot/postfix_1770768577
Cloning into '/var/lib/mock/dist-an23-build-513363-75099/root/chroot_tmpdir/scmroot/postfix_1770768577'...
$ git fetch origin 609d0b31181ad61fabb22c22d275da8e67d024c4:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/postfix_1770768577
 * [new ref]         609d0b31181ad61fabb22c22d275da8e67d024c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 609d0b3 Update code from upstream