$ git clone -n https://src.fedoraproject.org/rpms/ocaml-dune.git /var/lib/mock/f39-build-1974343-43328/root/chroot_tmpdir/scmroot/ocaml-dune
Cloning into '/var/lib/mock/f39-build-1974343-43328/root/chroot_tmpdir/scmroot/ocaml-dune'...
$ git fetch origin 7297f1f8dd42e6ec504da010081cca2d9f65db15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-dune
 * [new ref]         7297f1f8dd42e6ec504da010081cca2d9f65db15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7297f1f Version 3.10.0