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PEP 517 defines a different method of interfacing with setuptools. Rather than calling "setup.py" directly, the frontend should: 1. Set the current directory to the directory with a setup.py file 2. Import this module into a safe python interpreter (one in which setuptools can potentially set global variables or crash hard). 3. Call one of the functions defined in PEP 517. What each function does is defined in PEP 517. However, here is a "casual" definition of the functions (this definition should not be relied on for bug reports or API stability): - `build_wheel`: build a wheel in the folder and return the basename - `get_requires_for_build_wheel`: get the `setup_requires` to build - `prepare_metadata_for_build_wheel`: get the `install_requires` - `build_sdist`: build an sdist in the folder and return the basename - `get_requires_for_build_sdist`: get the `setup_requires` to build Again, this is not a formal definition! Just a "taste" of the module. """ import os import sys import tokenize import shutil import contextlib import setuptools import distutils class SetupRequirementsError(BaseException): def __init__(self, specifiers): self.specifiers = specifiers class Distribution(setuptools.dist.Distribution): def fetch_build_eggs(self, specifiers): raise SetupRequirementsError(specifiers) @classmethod @contextlib.contextmanager def patch(cls): """ Replace distutils.dist.Distribution with this class for the duration of this context. """ orig = distutils.core.Distribution distutils.core.Distribution = cls try: yield finally: distutils.core.Distribution = orig def _run_setup(setup_script='setup.py'): # Note that we can reuse our build directory between calls # Correctness comes first, then optimization later __file__ = setup_script __name__ = '__main__' f = getattr(tokenize, 'open', open)(__file__) code = f.read().replace('\\r\\n', '\\n') f.close() exec(compile(code, __file__, 'exec'), locals()) def _fix_config(config_settings): config_settings = config_settings or {} config_settings.setdefault('--global-option', []) return config_settings def _get_build_requires(config_settings): config_settings = _fix_config(config_settings) requirements = ['setuptools', 'wheel'] sys.argv = sys.argv[:1] + ['egg_info'] + \ config_settings["--global-option"] try: with Distribution.patch(): _run_setup() except SetupRequirementsError as e: requirements += e.specifiers return requirements def _get_immediate_subdirectories(a_dir): return [name for name in os.listdir(a_dir) if os.path.isdir(os.path.join(a_dir, name))] def get_requires_for_build_wheel(config_settings=None): config_settings = _fix_config(config_settings) return _get_build_requires(config_settings) def get_requires_for_build_sdist(config_settings=None): config_settings = _fix_config(config_settings) return _get_build_requires(config_settings) def prepare_metadata_for_build_wheel(metadata_directory, config_settings=None): sys.argv = sys.argv[:1] + ['dist_info', '--egg-base', metadata_directory] _run_setup() dist_info_directory = metadata_directory while True: dist_infos = [f for f in os.listdir(dist_info_directory) if f.endswith('.dist-info')] if len(dist_infos) == 0 and \ len(_get_immediate_subdirectories(dist_info_directory)) == 1: dist_info_directory = os.path.join( dist_info_directory, os.listdir(dist_info_directory)[0]) continue assert len(dist_infos) == 1 break # PEP 517 requires that the .dist-info directory be placed in the # metadata_directory. To comply, we MUST copy the directory to the root if dist_info_directory != metadata_directory: shutil.move( os.path.join(dist_info_directory, dist_infos[0]), metadata_directory) shutil.rmtree(dist_info_directory, ignore_errors=True) return dist_infos[0] def build_wheel(wheel_directory, config_settings=None, metadata_directory=None): config_settings = _fix_config(config_settings) wheel_directory = os.path.abspath(wheel_directory) sys.argv = sys.argv[:1] + ['bdist_wheel'] + \ config_settings["--global-option"] _run_setup() if wheel_directory != 'dist': shutil.rmtree(wheel_directory) shutil.copytree('dist', wheel_directory) wheels = [f for f in os.listdir(wheel_directory) if f.endswith('.whl')] assert len(wheels) == 1 return wheels[0] def build_sdist(sdist_directory, config_settings=None): config_settings = _fix_config(config_settings) sdist_directory = os.path.abspath(sdist_directory) sys.argv = sys.argv[:1] + ['sdist'] + \ config_settings["--global-option"] _run_setup() if sdist_directory != 'dist': shutil.rmtree(sdist_directory) shutil.copytree('dist', sdist_directory) sdists = [f for f in os.listdir(sdist_directory) if f.endswith('.tar.gz')] assert len(sdists) == 1 return sdists[0]