$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mlmpfr.git /var/lib/mock/f38-build-side-42-init-devel-619312-26333/root/chroot_tmpdir/scmroot/ocaml-mlmpfr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-619312-26333/root/chroot_tmpdir/scmroot/ocaml-mlmpfr'...
$ git fetch origin 03f77cc12f059dd4bcd02a55c2be60f2e12d7f38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mlmpfr
 * [new ref]         03f77cc12f059dd4bcd02a55c2be60f2e12d7f38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03f77cc Rebuild OCaml packages for F38