$ git clone -n https://src.fedoraproject.org/rpms/voro++.git /var/lib/mock/f39-build-1512512-35565/root/chroot_tmpdir/scmroot/voro++
Cloning into '/var/lib/mock/f39-build-1512512-35565/root/chroot_tmpdir/scmroot/voro++'...
$ git fetch origin b46f18f839a3804e5ebd0da52393da880b98ea55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/voro++
 * [new ref]         b46f18f839a3804e5ebd0da52393da880b98ea55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b46f18f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild