$ git clone -n https://src.fedoraproject.org/rpms/fedmod.git /var/lib/mock/f39-build-1854947-42397/root/chroot_tmpdir/scmroot/fedmod
Cloning into '/var/lib/mock/f39-build-1854947-42397/root/chroot_tmpdir/scmroot/fedmod'...
$ git fetch origin 6ab5b7eab52ed431f4a036555843bc82348b9855:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedmod
 * [new ref]         6ab5b7eab52ed431f4a036555843bc82348b9855 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ab5b7e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild