$ git clone -n https://src.fedoraproject.org/rpms/firmitas.git /var/lib/mock/f39-build-1694701-41162/root/chroot_tmpdir/scmroot/firmitas
Cloning into '/var/lib/mock/f39-build-1694701-41162/root/chroot_tmpdir/scmroot/firmitas'...
$ git fetch origin b7d104b4610ea6c1e885e292cbfec39402a8f2e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firmitas
 * [new ref]         b7d104b4610ea6c1e885e292cbfec39402a8f2e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7d104b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild