$ git clone -n https://src.fedoraproject.org/rpms/ocaml-lablgtk3.git /var/lib/mock/f40-build-783959-133234/root/chroot_tmpdir/scmroot/ocaml-lablgtk3
Cloning into '/var/lib/mock/f40-build-783959-133234/root/chroot_tmpdir/scmroot/ocaml-lablgtk3'...
$ git fetch origin b5b916b477e2d812e15e2a0fc91ba3faa055899a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-lablgtk3
 * [new ref]         b5b916b477e2d812e15e2a0fc91ba3faa055899a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5b916b Version 3.1.4