$ git clone -n https://src.fedoraproject.org/rpms/ocaml-re.git /var/lib/mock/f38-build-side-42-init-devel-669663-26662/root/chroot_tmpdir/scmroot/ocaml-re
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-669663-26662/root/chroot_tmpdir/scmroot/ocaml-re'...
$ git fetch origin 5f4829d61126a78f65e4330b2131bc3801ac9c98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-re
 * [new ref]         5f4829d61126a78f65e4330b2131bc3801ac9c98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f4829d Rebuild OCaml packages for F38