});

        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");

            // https://github.com/gradle/gradle-private/issues/3991
            System.out.println("Gradle runner not finished correctly (the build may be canceled). Fall back to KILL_ALL_GRADLE_PROCESSES.");
            executionMode = ExecutionMode.KILL_ALL_GRADLE_PROCESSES;
        }
    }

    private static void writePsOutputToFile(File rootProjectDir, List<String> psOutput) {