$ git clone -n https://src.fedoraproject.org/rpms/synthv1.git /var/lib/mock/f40-build-2042824-48575/root/chroot_tmpdir/scmroot/synthv1
Cloning into '/var/lib/mock/f40-build-2042824-48575/root/chroot_tmpdir/scmroot/synthv1'...
$ git fetch origin d731de9b08564c51d18606d3a0fe85d83488fc5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/synthv1
 * [new ref]         d731de9b08564c51d18606d3a0fe85d83488fc5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d731de9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild