$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf.git /var/lib/mock/f38-build-side-42-init-devel-695067-26981/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-695067-26981/root/chroot_tmpdir/scmroot/ocaml-ppx-custom-printf'...
$ git fetch origin f62e122604801d8a7538dd7bdf292f2cafc66951:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-custom-printf
 * [new ref]         f62e122604801d8a7538dd7bdf292f2cafc66951 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f62e122 Rebuild OCaml packages for F38