R invokerRequest = context.invokerRequest;
        if (invokerRequest.coreExtensions().isEmpty()
                || invokerRequest.coreExtensions().get().isEmpty()) {
            return Collections.emptyList();
        }

        List<CoreExtension> extensions = invokerRequest.coreExtensions().get();
        ContainerConfiguration cc = new DefaultContainerConfiguration()

            Set<String> providedArtifacts,
            List<CoreExtension> configuration,
            Function<String, String> interpolator)
            throws Exception {
        List<CoreExtensionEntry> extensions = new ArrayList<>();

        DependencyFilter dependencyFilter = new ExclusionsDependencyFilter(providedArtifacts);

        for (CoreExtension extension : configuration) {
            List<Artifact> artifacts =

    protected abstract O assembleOptions(List<O> parsedOptions);

    protected List<CoreExtension> readCoreExtensionsDescriptor(LocalContext context)
            throws ParserException, IOException {
        ArrayList<CoreExtension> extensions = new ArrayList<>();
        String installationExtensionsFile = context.userProperties.get(Constants.MAVEN_INSTALLATION_EXTENSIONS);