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The 'runner', if provided, must expect the following: cmd : a list of strings representing the command and arguments to execute, as would be passed to e.g. 'subprocess.check_call'. cwd : a string representing the working directory that must be used for the subprocess. Corresponds to the provided source_dir. extra_environ : a dict mapping environment variable names to values which must be set for the subprocess execution. Nc s_ | d k r t } t | � � _ | � _ | rI � f d d � | D� } | � _ | � _ d S)Nc s" g | ] } t � j | � � q Sr )r? � source_dir)�.0�p)r r r � <listcomp>� s z-Pep517HookCaller.__init__.<locals>.<listcomp>)r1 r rA � build_backendr" �_subprocess_runner)r rA rE r" �runnerr )r r r w s zPep517HookCaller.__init__c c s, | j } | | _ z d VWd | | _ Xd S)z\A context manager for temporarily overriding the default subprocess runner. N)rF )r rG �prevr r r �subprocess_runner� s z"Pep517HookCaller.subprocess_runnerc C s | j d d | i � S)aG Identify packages required for building a wheel Returns a list of dependency specifications, e.g.: ["wheel >= 0.25", "setuptools"] This does not include requirements specified in pyproject.toml. It returns the result of calling the equivalently named hook in a subprocess. � get_requires_for_build_wheel�config_settings)� _call_hook)r rK r r r rJ � s z-Pep517HookCaller.get_requires_for_build_wheelTc C s( | j d d t | � d | d | i � S)aq Prepare a *.dist-info folder with metadata for this project. Returns the name of the newly created folder. If the build backend defines a hook with this name, it will be called in a subprocess. 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