$ git clone -n https://src.fedoraproject.org/rpms/R-xopen.git /var/lib/mock/f38-build-side-42-init-devel-680912-26737/root/chroot_tmpdir/scmroot/R-xopen
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-680912-26737/root/chroot_tmpdir/scmroot/R-xopen'...
$ git fetch origin b8df125d8ae962bedaeadc09af67fd6c6d68f680:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-xopen
 * [new ref]         b8df125d8ae962bedaeadc09af67fd6c6d68f680 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8df125 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild