$ git clone -n https://gitee.com/src-opencloudos-rpms/gc.git /var/lib/mock/dist-oc9-build-63539-16463/root/chroot_tmpdir/scmroot/gc
Cloning into '/var/lib/mock/dist-oc9-build-63539-16463/root/chroot_tmpdir/scmroot/gc'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/gc
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa70cb8 import gc-8.0.6-4.tl4