$ git clone -n https://gitee.com/src-opencloudos-rpms/ocaml-dune /var/lib/mock/dist-oc9-build-52833-14730/root/chroot_tmpdir/scmroot/ocaml-dune
Cloning into '/var/lib/mock/dist-oc9-build-52833-14730/root/chroot_tmpdir/scmroot/ocaml-dune'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/ocaml-dune
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15938a3 Rebuild