$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mlmpfr.git /var/lib/mock/f42-build-865522-173241/root/chroot_tmpdir/scmroot/ocaml-mlmpfr
Cloning into '/var/lib/mock/f42-build-865522-173241/root/chroot_tmpdir/scmroot/ocaml-mlmpfr'...
$ git fetch origin 5fd504f132ac50552418f72c0dc3cd4838155b5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mlmpfr
 * [new ref]         5fd504f132ac50552418f72c0dc3cd4838155b5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fd504f OCaml 5.3.0 rebuild for Fedora 42