$ git clone -n https://gitee.com/src-opencloudos-rpms/systemd.git /var/lib/mock/dist-oc9-build-251625-84129/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/dist-oc9-build-251625-84129/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin b886860bde5b613fbf8f96d59c63858750e80d24:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/systemd
 * [new ref]         b886860bde5b613fbf8f96d59c63858750e80d24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b886860 import systemd-255-20.tl4.ap.6