$ git clone -n https://src.fedoraproject.org/rpms/ocaml-dune.git /var/lib/mock/f40-build-739599-109126/root/chroot_tmpdir/scmroot/ocaml-dune
Cloning into '/var/lib/mock/f40-build-739599-109126/root/chroot_tmpdir/scmroot/ocaml-dune'...
$ git fetch origin b6e079d202a413a2fc1705e6489bc50febd79d7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-dune
 * [new ref]         b6e079d202a413a2fc1705e6489bc50febd79d7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6e079d Version 3.11.1