$ git clone -n https://src.fedoraproject.org/rpms/ocaml-postgresql.git /var/lib/mock/f31-build-44133-25887/root/chroot_tmpdir/scmroot/ocaml-postgresql
Cloning into '/var/lib/mock/f31-build-44133-25887/root/chroot_tmpdir/scmroot/ocaml-postgresql'...
$ git reset --hard e687c53d2b20e1f65e511ab35f437ed677fd81d3
HEAD is now at e687c53 OCaml 4.08.0 (final) rebuild.