$ git clone -n https://src.fedoraproject.org/rpms/R-systemfonts.git /var/lib/mock/f40-build-789227-135686/root/chroot_tmpdir/scmroot/R-systemfonts
Cloning into '/var/lib/mock/f40-build-789227-135686/root/chroot_tmpdir/scmroot/R-systemfonts'...
$ git fetch origin b595968b7dfe9b3a041c89ba81c2ee7e04ff82df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-systemfonts
 * [new ref]         b595968b7dfe9b3a041c89ba81c2ee7e04ff82df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b595968 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild