$ git clone -n https://src.fedoraproject.org/rpms/R-rex /var/lib/mock/f41-build-side-1-3149098-40244/root/chroot_tmpdir/scmroot/R-rex
Cloning into '/var/lib/mock/f41-build-side-1-3149098-40244/root/chroot_tmpdir/scmroot/R-rex'...
$ git fetch origin 23fc589df5c19f75f8ad4a3f3816666cc047b99d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rex
 * [new ref]         23fc589df5c19f75f8ad4a3f3816666cc047b99d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23fc589 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild