def init_argparser(self, argparser):
        """
        Other runtimes (or users of ArgumentParser) can pass their
        subparser into here to collect the arguments here for a
        subcommand.
        """

        super(SourcePackageToolchainRuntime, self).init_argparser(argparser)

        self.init_argparser_source_registry(argparser)
        self.init_argparser_package_names(argparser)