$ git clone -n https://src.fedoraproject.org/rpms/ocaml-zarith.git /var/lib/mock/f40-build-2068577-49293/root/chroot_tmpdir/scmroot/ocaml-zarith
Cloning into '/var/lib/mock/f40-build-2068577-49293/root/chroot_tmpdir/scmroot/ocaml-zarith'...
$ git fetch origin 4f349d251e8c252174eb81717671652f1db909b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-zarith
 * [new ref]         4f349d251e8c252174eb81717671652f1db909b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f349d2 OCaml 5.1.1 + s390x code gen fix for Fedora 40