$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppxlib.git /var/lib/mock/f42-build-872332-177964/root/chroot_tmpdir/scmroot/ocaml-ppxlib
Cloning into '/var/lib/mock/f42-build-872332-177964/root/chroot_tmpdir/scmroot/ocaml-ppxlib'...
$ git fetch origin 7ff3322415263da421edb0ebb63c21477ae98fc4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppxlib
 * [new ref]         7ff3322415263da421edb0ebb63c21477ae98fc4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ff3322 Version 0.35.0