$ git clone -n https://src.fedoraproject.org/rpms/ocaml-csexp.git /var/lib/mock/f45-build-20494-571/root/chroot_tmpdir/scmroot/ocaml-csexp
Cloning into '/var/lib/mock/f45-build-20494-571/root/chroot_tmpdir/scmroot/ocaml-csexp'...
$ git fetch origin bffc567c2bd5bf955d5d328c86271327bd9be4fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-csexp
 * [new ref]         bffc567c2bd5bf955d5d328c86271327bd9be4fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bffc567 OCaml 5.5.1 rebuild