$ git clone -n https://src.fedoraproject.org/rpms/R-unix.git /var/lib/mock/f38-build-side-42-init-devel-736679-27649/root/chroot_tmpdir/scmroot/R-unix
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-736679-27649/root/chroot_tmpdir/scmroot/R-unix'...
$ git fetch origin 08624b5811f685edb4288d9d39fe13348231c0de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-unix
 * [new ref]         08624b5811f685edb4288d9d39fe13348231c0de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08624b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild