$ git clone -n https://gitee.com/src-opencloudos-rpms/zchunk.git /var/lib/mock/dist-oc9-build-58637-16463/root/chroot_tmpdir/scmroot/zchunk
Cloning into '/var/lib/mock/dist-oc9-build-58637-16463/root/chroot_tmpdir/scmroot/zchunk'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/zchunk
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ddffcfd import zchunk-1.3.1-3.tl4