$ git clone -n https://src.fedoraproject.org/rpms/ocaml-csexp.git /var/lib/mock/f42-build-865454-173151/root/chroot_tmpdir/scmroot/ocaml-csexp
Cloning into '/var/lib/mock/f42-build-865454-173151/root/chroot_tmpdir/scmroot/ocaml-csexp'...
$ git fetch origin cf9f983cd143d26375f50e24c42c40874e0fafe5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-csexp
 * [new ref]         cf9f983cd143d26375f50e24c42c40874e0fafe5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf9f983 OCaml 5.3.0 rebuild for Fedora 42