$ git clone -n https://gitee.com/src-opencloudos-rpms/libserf.git /var/lib/mock/dist-oc9-build-60698-16463/root/chroot_tmpdir/scmroot/libserf
Cloning into '/var/lib/mock/dist-oc9-build-60698-16463/root/chroot_tmpdir/scmroot/libserf'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libserf
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f455a3a import libserf-1.3.9-5.tl4