$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf.git /var/lib/mock/f41-build-838581-159715/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf
Cloning into '/var/lib/mock/f41-build-838581-159715/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf'...
$ git fetch origin ca515b02f750f91c3c8dfab2e40a34e698e4c038:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf
 * [new ref]         ca515b02f750f91c3c8dfab2e40a34e698e4c038 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca515b0 Rebuild for ocaml-ppxlib 0.33.0