$ git clone -n https://src.fedoraproject.org/rpms/ocaml-csexp.git /var/lib/mock/f40-build-2265563-54610/root/chroot_tmpdir/scmroot/ocaml-csexp
Cloning into '/var/lib/mock/f40-build-2265563-54610/root/chroot_tmpdir/scmroot/ocaml-csexp'...
$ git fetch origin b9987ba6ce4a00c8893786cada30999c7ac63c2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-csexp
 * [new ref]         b9987ba6ce4a00c8893786cada30999c7ac63c2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9987ba Update dune version