$ git clone -n https://src.fedoraproject.org/rpms/ocaml-dune.git /var/lib/mock/f40-build-796862-140979/root/chroot_tmpdir/scmroot/ocaml-dune
Cloning into '/var/lib/mock/f40-build-796862-140979/root/chroot_tmpdir/scmroot/ocaml-dune'...
$ git fetch origin 30e1a15ea4a3c9fe6dd95e817692f381ce7c9bb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-dune
 * [new ref]         30e1a15ea4a3c9fe6dd95e817692f381ce7c9bb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30e1a15 Version 3.14.2