$ git clone -n https://src.fedoraproject.org/rpms/R-systemfonts.git /var/lib/mock/f38-build-side-42-init-devel-850829-28425/root/chroot_tmpdir/scmroot/R-systemfonts
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-850829-28425/root/chroot_tmpdir/scmroot/R-systemfonts'...
$ git fetch origin 8c86cc4a6cc83279d82da8ecfa1a34781c755b27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-systemfonts
 * [new ref]         8c86cc4a6cc83279d82da8ecfa1a34781c755b27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c86cc4 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild