$ git clone -n https://src.fedoraproject.org/rpms/ocaml-compiler-libs-janestreet.git /var/lib/mock/f40-build-739624-109132/root/chroot_tmpdir/scmroot/ocaml-compiler-libs-janestreet
Cloning into '/var/lib/mock/f40-build-739624-109132/root/chroot_tmpdir/scmroot/ocaml-compiler-libs-janestreet'...
$ git fetch origin 3db7530bcb61cec59a4457ffe9fa87708059e75f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-compiler-libs-janestreet
 * [new ref]         3db7530bcb61cec59a4457ffe9fa87708059e75f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3db7530 OCaml 5.1 rebuild for Fedora 40