$ git clone -n https://src.fedoraproject.org/rpms/ocaml-lacaml.git /var/lib/mock/f38-build-side-42-init-devel-637338-26384/root/chroot_tmpdir/scmroot/ocaml-lacaml
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-637338-26384/root/chroot_tmpdir/scmroot/ocaml-lacaml'...
$ git fetch origin b70a3f13d99b674b78a394f912328f03bba83828:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-lacaml
 * [new ref]         b70a3f13d99b674b78a394f912328f03bba83828 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b70a3f1 Rebuild OCaml packages for F38