def is_os_supported(self, os_name=None):
        """Check if the OS is supported by this plugin.

        In some cases a plugin will not work under a particular OS. Usually because the
        command line tool used to implement the plugin functionality is not available.

        Args:
            os_name: String describing OS. See self.host_os_support() and
                self.host_os_info()

        Returns:
            True if plugin works under certain OS.
        """
        return True