protected int execute(MavenContext context) throws Exception {
        MavenExecutionRequest request = prepareMavenExecutionRequest();
        toolchains(context, request);
        populateRequest(context, context.lookup, request);
        return doExecute(context, request);
    }

    protected MavenExecutionRequest prepareMavenExecutionRequest() throws Exception {
        // explicitly fill in "defaults"?