$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf.git /var/lib/mock/f45-build-20654-572/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf
Cloning into '/var/lib/mock/f45-build-20654-572/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf'...
$ git fetch origin 1e31e9807646c524a3dea76a9993f9495a8c1c1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf
 * [new ref]         1e31e9807646c524a3dea76a9993f9495a8c1c1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e31e98 OCaml 5.5.1 rebuild