$ git clone -n https://src.fedoraproject.org/rpms/ocaml-zarith.git /var/lib/mock/f40-build-2617274-64396/root/chroot_tmpdir/scmroot/ocaml-zarith
Cloning into '/var/lib/mock/f40-build-2617274-64396/root/chroot_tmpdir/scmroot/ocaml-zarith'...
$ git fetch origin cba930e29c4f9d39027bdd2dbecb15754427066e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-zarith
 * [new ref]         cba930e29c4f9d39027bdd2dbecb15754427066e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cba930e Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild