$ git clone -n https://gitee.com/src-opencloudos-rpms/tuna.git /var/lib/mock/dist-oc9-build-45330-14591/root/chroot_tmpdir/scmroot/tuna
Cloning into '/var/lib/mock/dist-oc9-build-45330-14591/root/chroot_tmpdir/scmroot/tuna'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/tuna
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 621e991 import tuna-0.18-3.tl4