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282 lines
10 KiB
282 lines
10 KiB
2 days ago
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"""A PEP 517 interface to setuptools
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Previously, when a user or a command line tool (let's call it a "frontend")
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needed to make a request of setuptools to take a certain action, for
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example, generating a list of installation requirements, the frontend would
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would call "setup.py egg_info" or "setup.py bdist_wheel" on the command line.
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PEP 517 defines a different method of interfacing with setuptools. Rather
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than calling "setup.py" directly, the frontend should:
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1. Set the current directory to the directory with a setup.py file
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2. Import this module into a safe python interpreter (one in which
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setuptools can potentially set global variables or crash hard).
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3. Call one of the functions defined in PEP 517.
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What each function does is defined in PEP 517. However, here is a "casual"
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definition of the functions (this definition should not be relied on for
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bug reports or API stability):
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- `build_wheel`: build a wheel in the folder and return the basename
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- `get_requires_for_build_wheel`: get the `setup_requires` to build
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- `prepare_metadata_for_build_wheel`: get the `install_requires`
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- `build_sdist`: build an sdist in the folder and return the basename
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- `get_requires_for_build_sdist`: get the `setup_requires` to build
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Again, this is not a formal definition! Just a "taste" of the module.
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"""
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import io
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import os
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import sys
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import tokenize
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import shutil
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import contextlib
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import tempfile
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import setuptools
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import distutils
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from pkg_resources import parse_requirements
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__all__ = ['get_requires_for_build_sdist',
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'get_requires_for_build_wheel',
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'prepare_metadata_for_build_wheel',
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'build_wheel',
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'build_sdist',
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'__legacy__',
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'SetupRequirementsError']
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class SetupRequirementsError(BaseException):
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def __init__(self, specifiers):
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self.specifiers = specifiers
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class Distribution(setuptools.dist.Distribution):
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def fetch_build_eggs(self, specifiers):
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specifier_list = list(map(str, parse_requirements(specifiers)))
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raise SetupRequirementsError(specifier_list)
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@classmethod
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@contextlib.contextmanager
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def patch(cls):
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"""
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Replace
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distutils.dist.Distribution with this class
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for the duration of this context.
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"""
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orig = distutils.core.Distribution
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distutils.core.Distribution = cls
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try:
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yield
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finally:
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distutils.core.Distribution = orig
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@contextlib.contextmanager
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def no_install_setup_requires():
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"""Temporarily disable installing setup_requires
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Under PEP 517, the backend reports build dependencies to the frontend,
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and the frontend is responsible for ensuring they're installed.
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So setuptools (acting as a backend) should not try to install them.
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"""
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orig = setuptools._install_setup_requires
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setuptools._install_setup_requires = lambda attrs: None
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try:
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yield
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finally:
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setuptools._install_setup_requires = orig
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def _get_immediate_subdirectories(a_dir):
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return [name for name in os.listdir(a_dir)
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if os.path.isdir(os.path.join(a_dir, name))]
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def _file_with_extension(directory, extension):
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matching = (
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f for f in os.listdir(directory)
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if f.endswith(extension)
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)
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try:
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file, = matching
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except ValueError:
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raise ValueError(
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'No distribution was found. Ensure that `setup.py` '
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'is not empty and that it calls `setup()`.')
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return file
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def _open_setup_script(setup_script):
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if not os.path.exists(setup_script):
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# Supply a default setup.py
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return io.StringIO(u"from setuptools import setup; setup()")
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return getattr(tokenize, 'open', open)(setup_script)
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class _BuildMetaBackend(object):
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def _fix_config(self, config_settings):
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config_settings = config_settings or {}
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config_settings.setdefault('--global-option', [])
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return config_settings
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def _get_build_requires(self, config_settings, requirements):
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config_settings = self._fix_config(config_settings)
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sys.argv = sys.argv[:1] + ['egg_info'] + \
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config_settings["--global-option"]
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try:
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with Distribution.patch():
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self.run_setup()
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except SetupRequirementsError as e:
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requirements += e.specifiers
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return requirements
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def run_setup(self, setup_script='setup.py'):
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# Note that we can reuse our build directory between calls
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# Correctness comes first, then optimization later
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__file__ = setup_script
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__name__ = '__main__'
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with _open_setup_script(__file__) as f:
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code = f.read().replace(r'\r\n', r'\n')
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exec(compile(code, __file__, 'exec'), locals())
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def get_requires_for_build_wheel(self, config_settings=None):
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config_settings = self._fix_config(config_settings)
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return self._get_build_requires(
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config_settings, requirements=['wheel'])
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def get_requires_for_build_sdist(self, config_settings=None):
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config_settings = self._fix_config(config_settings)
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return self._get_build_requires(config_settings, requirements=[])
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def prepare_metadata_for_build_wheel(self, metadata_directory,
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config_settings=None):
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sys.argv = sys.argv[:1] + [
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'dist_info', '--egg-base', metadata_directory]
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with no_install_setup_requires():
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self.run_setup()
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dist_info_directory = metadata_directory
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while True:
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dist_infos = [f for f in os.listdir(dist_info_directory)
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if f.endswith('.dist-info')]
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if (
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len(dist_infos) == 0 and
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len(_get_immediate_subdirectories(dist_info_directory)) == 1
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):
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dist_info_directory = os.path.join(
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dist_info_directory, os.listdir(dist_info_directory)[0])
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continue
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assert len(dist_infos) == 1
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break
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# PEP 517 requires that the .dist-info directory be placed in the
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# metadata_directory. To comply, we MUST copy the directory to the root
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if dist_info_directory != metadata_directory:
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shutil.move(
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os.path.join(dist_info_directory, dist_infos[0]),
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metadata_directory)
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shutil.rmtree(dist_info_directory, ignore_errors=True)
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return dist_infos[0]
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def _build_with_temp_dir(self, setup_command, result_extension,
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result_directory, config_settings):
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config_settings = self._fix_config(config_settings)
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result_directory = os.path.abspath(result_directory)
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# Build in a temporary directory, then copy to the target.
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os.makedirs(result_directory, exist_ok=True)
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with tempfile.TemporaryDirectory(dir=result_directory) as tmp_dist_dir:
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sys.argv = (sys.argv[:1] + setup_command +
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['--dist-dir', tmp_dist_dir] +
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config_settings["--global-option"])
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with no_install_setup_requires():
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self.run_setup()
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result_basename = _file_with_extension(
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tmp_dist_dir, result_extension)
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result_path = os.path.join(result_directory, result_basename)
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if os.path.exists(result_path):
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# os.rename will fail overwriting on non-Unix.
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os.remove(result_path)
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os.rename(os.path.join(tmp_dist_dir, result_basename), result_path)
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return result_basename
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def build_wheel(self, wheel_directory, config_settings=None,
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metadata_directory=None):
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return self._build_with_temp_dir(['bdist_wheel'], '.whl',
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wheel_directory, config_settings)
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def build_sdist(self, sdist_directory, config_settings=None):
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return self._build_with_temp_dir(['sdist', '--formats', 'gztar'],
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'.tar.gz', sdist_directory,
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config_settings)
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class _BuildMetaLegacyBackend(_BuildMetaBackend):
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"""Compatibility backend for setuptools
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This is a version of setuptools.build_meta that endeavors
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to maintain backwards
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compatibility with pre-PEP 517 modes of invocation. It
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exists as a temporary
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bridge between the old packaging mechanism and the new
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packaging mechanism,
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and will eventually be removed.
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"""
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def run_setup(self, setup_script='setup.py'):
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# In order to maintain compatibility with scripts assuming that
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# the setup.py script is in a directory on the PYTHONPATH, inject
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# '' into sys.path. (pypa/setuptools#1642)
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sys_path = list(sys.path) # Save the original path
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script_dir = os.path.dirname(os.path.abspath(setup_script))
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if script_dir not in sys.path:
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sys.path.insert(0, script_dir)
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# Some setup.py scripts (e.g. in pygame and numpy) use sys.argv[0] to
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# get the directory of the source code. They expect it to refer to the
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# setup.py script.
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sys_argv_0 = sys.argv[0]
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sys.argv[0] = setup_script
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try:
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super(_BuildMetaLegacyBackend,
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self).run_setup(setup_script=setup_script)
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finally:
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# While PEP 517 frontends should be calling each hook in a fresh
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# subprocess according to the standard (and thus it should not be
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# strictly necessary to restore the old sys.path), we'll restore
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# the original path so that the path manipulation does not persist
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# within the hook after run_setup is called.
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sys.path[:] = sys_path
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sys.argv[0] = sys_argv_0
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# The primary backend
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_BACKEND = _BuildMetaBackend()
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get_requires_for_build_wheel = _BACKEND.get_requires_for_build_wheel
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get_requires_for_build_sdist = _BACKEND.get_requires_for_build_sdist
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prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel
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build_wheel = _BACKEND.build_wheel
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build_sdist = _BACKEND.build_sdist
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# The legacy backend
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__legacy__ = _BuildMetaLegacyBackend()
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