$ git clone -n https://src.fedoraproject.org/rpms/ocaml-zarith.git /var/lib/mock/f40-build-739620-109132/root/chroot_tmpdir/scmroot/ocaml-zarith
Cloning into '/var/lib/mock/f40-build-739620-109132/root/chroot_tmpdir/scmroot/ocaml-zarith'...
$ git fetch origin 4183fe7dfe1a2c8f9936c37c17606dc49310a3b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-zarith
 * [new ref]         4183fe7dfe1a2c8f9936c37c17606dc49310a3b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4183fe7 OCaml 5.1 rebuild for Fedora 40