$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-derivers.git /var/lib/mock/f40-build-2228994-53114/root/chroot_tmpdir/scmroot/ocaml-ppx-derivers
Cloning into '/var/lib/mock/f40-build-2228994-53114/root/chroot_tmpdir/scmroot/ocaml-ppx-derivers'...
$ git fetch origin 19321c38784500f5d1639029e210841a5486ad8b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-derivers
 * [new ref]         19321c38784500f5d1639029e210841a5486ad8b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19321c3 OCaml 5.1.1 + s390x code gen fix for Fedora 40