$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-base.git /var/lib/mock/f38-build-side-42-init-devel-753031-27663/root/chroot_tmpdir/scmroot/ocaml-ppx-base
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-753031-27663/root/chroot_tmpdir/scmroot/ocaml-ppx-base'...
$ git fetch origin 7d152088feed265f606f5dcd2bdd011ccf390606:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-base
 * [new ref]         7d152088feed265f606f5dcd2bdd011ccf390606 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d15208 Rebuild OCaml packages for F38