$ git clone -n https://gitee.com/src-opencloudos-rpms/diffstat.git /var/lib/mock/dist-oc9-build-64142-16463/root/chroot_tmpdir/scmroot/diffstat
Cloning into '/var/lib/mock/dist-oc9-build-64142-16463/root/chroot_tmpdir/scmroot/diffstat'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/diffstat
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e5cc5a import diffstat-1.64-4.tl4