$ git clone -n https://gitee.com/src-opencloudos-rpms/mrtg.git /var/lib/mock/dist-oc9-build-129208-77725/root/chroot_tmpdir/scmroot/mrtg
Cloning into '/var/lib/mock/dist-oc9-build-129208-77725/root/chroot_tmpdir/scmroot/mrtg'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/mrtg
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48d3e3f import mrtg-2.17.10-6.tl4