$ git clone -n https://src.fedoraproject.org/rpms/ocaml-yojson.git /var/lib/mock/f40-build-2244680-53717/root/chroot_tmpdir/scmroot/ocaml-yojson
Cloning into '/var/lib/mock/f40-build-2244680-53717/root/chroot_tmpdir/scmroot/ocaml-yojson'...
$ git fetch origin 57a461dd9adbe329480c30664dbd8458ce960d15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-yojson
 * [new ref]         57a461dd9adbe329480c30664dbd8458ce960d15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57a461d OCaml 5.1.1 + s390x code gen fix for Fedora 40