$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf.git /var/lib/mock/f40-build-784001-133236/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf
Cloning into '/var/lib/mock/f40-build-784001-133236/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf'...
$ git fetch origin 57504480d095d8a27cfea8480f941ef6b7527916:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf
 * [new ref]         57504480d095d8a27cfea8480f941ef6b7527916 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5750448 Rebuild for changed ocamlx hashes