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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def env_updated(cls, app, env):
 """Abort Sphinx after initializing config and discovering all pages to build. :param sphinx.application.Sphinx app: Sphinx application object. :param sphinx.environment.BuildEnvironment env: Sphinx build environment. """

        if cls.ABORT_AFTER_READ:
            config = {n: getattr(app.config, n) for n in (a for a in dir(app.config) if a.startswith('scv_'))}
            config['found_docs'] = tuple(str(d) for d in env.found_docs)
            config['master_doc'] = str(app.config.master_doc)
            cls.ABORT_AFTER_READ.put(config)
            sys.exit(0)