Returns true if the feature should run

def should_run(self):
        """ Returns true if the feature should run """
        should_run = True
        config = self.target or self.source
        if config.has('systems'):
            should_run = False
            valid_systems = [s.lower() for s in config.get('systems').split(",")]
            for system_type, param in [('is_osx', 'osx'),
                                       ('is_debian', 'debian')]:
                if param in valid_systems and getattr(system, system_type)():
                    should_run = True
        return should_run