$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mccs.git /var/lib/mock/f40-build-783968-133234/root/chroot_tmpdir/scmroot/ocaml-mccs
Cloning into '/var/lib/mock/f40-build-783968-133234/root/chroot_tmpdir/scmroot/ocaml-mccs'...
$ git fetch origin 21e688b33a7150879193b48c4b4ee31edcaff93a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mccs
 * [new ref]         21e688b33a7150879193b48c4b4ee31edcaff93a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21e688b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild