$ git clone -n https://src.fedoraproject.org/rpms/rootfiles.git /var/lib/mock/f40-build-2321885-58615/root/chroot_tmpdir/scmroot/rootfiles
Cloning into '/var/lib/mock/f40-build-2321885-58615/root/chroot_tmpdir/scmroot/rootfiles'...
$ git fetch origin 9d7b14672e34441a1bdf297dd7347778b85d0a13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rootfiles
 * [new ref]         9d7b14672e34441a1bdf297dd7347778b85d0a13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d7b146 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild