});

        TaskProvider<Sync> userguideFlattenSources = tasks.register("stageUserguideSource", Sync.class, task -> {
            task.setDuplicatesStrategy(DuplicatesStrategy.FAIL);

            // TODO: This doesn't allow adoc files to be generated?
            task.from(extension.getUserManual().getRoot(), sub -> {
                sub.include("**/*.adoc");