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:param debug: If True, use juju --debug logging.
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old_env = SimpleEnvironment.from_config(env)
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old_client = EnvJujuClient.by_version(old_env, debug=debug)
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new_env = SimpleEnvironment.from_config(env)
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if new_agent_url is not None:
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new_env.config['tools-metadata-url'] = new_agent_url