$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ounit.git /var/lib/mock/f38-build-side-42-init-devel-661156-26630/root/chroot_tmpdir/scmroot/ocaml-ounit
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-661156-26630/root/chroot_tmpdir/scmroot/ocaml-ounit'...
$ git fetch origin 388eca17f87877b4a963cbb6aa8b75b89605f2a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ounit
 * [new ref]         388eca17f87877b4a963cbb6aa8b75b89605f2a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 388eca1 Rebuild OCaml packages for F38