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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
commit9468226a9e2e2ab8cdd599f1d8538e860ca86120 (patch)
tree0a77ada226d6db80639f96b438bf83e4e756edb5 /env/lib/python3.10/site-packages/setuptools/build_meta.py
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+"""A PEP 517 interface to setuptools
+
+Previously, when a user or a command line tool (let's call it a "frontend")
+needed to make a request of setuptools to take a certain action, for
+example, generating a list of installation requirements, the frontend would
+would call "setup.py egg_info" or "setup.py bdist_wheel" on the command line.
+
+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 io
+import os
+import sys
+import tokenize
+import shutil
+import contextlib
+import tempfile
+import warnings
+
+import setuptools
+import distutils
+from ._reqs import parse_strings
+from .extern.more_itertools import always_iterable
+
+
+__all__ = ['get_requires_for_build_sdist',
+ 'get_requires_for_build_wheel',
+ 'prepare_metadata_for_build_wheel',
+ 'build_wheel',
+ 'build_sdist',
+ '__legacy__',
+ 'SetupRequirementsError']
+
+
+class SetupRequirementsError(BaseException):
+ def __init__(self, specifiers):
+ self.specifiers = specifiers
+
+
+class Distribution(setuptools.dist.Distribution):
+ def fetch_build_eggs(self, specifiers):
+ specifier_list = list(parse_strings(specifiers))
+
+ raise SetupRequirementsError(specifier_list)
+
+ @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
+
+
+@contextlib.contextmanager
+def no_install_setup_requires():
+ """Temporarily disable installing setup_requires
+
+ Under PEP 517, the backend reports build dependencies to the frontend,
+ and the frontend is responsible for ensuring they're installed.
+ So setuptools (acting as a backend) should not try to install them.
+ """
+ orig = setuptools._install_setup_requires
+ setuptools._install_setup_requires = lambda attrs: None
+ try:
+ yield
+ finally:
+ setuptools._install_setup_requires = orig
+
+
+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 _file_with_extension(directory, extension):
+ matching = (
+ f for f in os.listdir(directory)
+ if f.endswith(extension)
+ )
+ try:
+ file, = matching
+ except ValueError:
+ raise ValueError(
+ 'No distribution was found. Ensure that `setup.py` '
+ 'is not empty and that it calls `setup()`.')
+ return file
+
+
+def _open_setup_script(setup_script):
+ if not os.path.exists(setup_script):
+ # Supply a default setup.py
+ return io.StringIO(u"from setuptools import setup; setup()")
+
+ return getattr(tokenize, 'open', open)(setup_script)
+
+
+@contextlib.contextmanager
+def suppress_known_deprecation():
+ with warnings.catch_warnings():
+ warnings.filterwarnings('ignore', 'setup.py install is deprecated')
+ yield
+
+
+class _BuildMetaBackend:
+
+ @staticmethod
+ def _fix_config(config_settings):
+ """
+ Ensure config settings meet certain expectations.
+
+ >>> fc = _BuildMetaBackend._fix_config
+ >>> fc(None)
+ {'--global-option': []}
+ >>> fc({})
+ {'--global-option': []}
+ >>> fc({'--global-option': 'foo'})
+ {'--global-option': ['foo']}
+ >>> fc({'--global-option': ['foo']})
+ {'--global-option': ['foo']}
+ """
+ config_settings = config_settings or {}
+ config_settings['--global-option'] = list(always_iterable(
+ config_settings.get('--global-option')))
+ return config_settings
+
+ def _get_build_requires(self, config_settings, requirements):
+ config_settings = self._fix_config(config_settings)
+
+ sys.argv = sys.argv[:1] + ['egg_info'] + \
+ config_settings["--global-option"]
+ try:
+ with Distribution.patch():
+ self.run_setup()
+ except SetupRequirementsError as e:
+ requirements += e.specifiers
+
+ return requirements
+
+ def run_setup(self, 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__'
+
+ with _open_setup_script(__file__) as f:
+ code = f.read().replace(r'\r\n', r'\n')
+
+ exec(code, locals())
+
+ def get_requires_for_build_wheel(self, config_settings=None):
+ return self._get_build_requires(
+ config_settings, requirements=['wheel'])
+
+ def get_requires_for_build_sdist(self, config_settings=None):
+ return self._get_build_requires(config_settings, requirements=[])
+
+ def prepare_metadata_for_build_wheel(self, metadata_directory,
+ config_settings=None):
+ sys.argv = sys.argv[:1] + [
+ 'dist_info', '--egg-base', metadata_directory]
+ with no_install_setup_requires():
+ self.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_with_temp_dir(self, setup_command, result_extension,
+ result_directory, config_settings):
+ config_settings = self._fix_config(config_settings)
+ result_directory = os.path.abspath(result_directory)
+
+ # Build in a temporary directory, then copy to the target.
+ os.makedirs(result_directory, exist_ok=True)
+ with tempfile.TemporaryDirectory(dir=result_directory) as tmp_dist_dir:
+ sys.argv = (sys.argv[:1] + setup_command +
+ ['--dist-dir', tmp_dist_dir] +
+ config_settings["--global-option"])
+ with no_install_setup_requires():
+ self.run_setup()
+
+ result_basename = _file_with_extension(
+ tmp_dist_dir, result_extension)
+ result_path = os.path.join(result_directory, result_basename)
+ if os.path.exists(result_path):
+ # os.rename will fail overwriting on non-Unix.
+ os.remove(result_path)
+ os.rename(os.path.join(tmp_dist_dir, result_basename), result_path)
+
+ return result_basename
+
+ def build_wheel(self, wheel_directory, config_settings=None,
+ metadata_directory=None):
+ with suppress_known_deprecation():
+ return self._build_with_temp_dir(['bdist_wheel'], '.whl',
+ wheel_directory, config_settings)
+
+ def build_sdist(self, sdist_directory, config_settings=None):
+ return self._build_with_temp_dir(['sdist', '--formats', 'gztar'],
+ '.tar.gz', sdist_directory,
+ config_settings)
+
+
+class _BuildMetaLegacyBackend(_BuildMetaBackend):
+ """Compatibility backend for setuptools
+
+ This is a version of setuptools.build_meta that endeavors
+ to maintain backwards
+ compatibility with pre-PEP 517 modes of invocation. It
+ exists as a temporary
+ bridge between the old packaging mechanism and the new
+ packaging mechanism,
+ and will eventually be removed.
+ """
+ def run_setup(self, setup_script='setup.py'):
+ # In order to maintain compatibility with scripts assuming that
+ # the setup.py script is in a directory on the PYTHONPATH, inject
+ # '' into sys.path. (pypa/setuptools#1642)
+ sys_path = list(sys.path) # Save the original path
+
+ script_dir = os.path.dirname(os.path.abspath(setup_script))
+ if script_dir not in sys.path:
+ sys.path.insert(0, script_dir)
+
+ # Some setup.py scripts (e.g. in pygame and numpy) use sys.argv[0] to
+ # get the directory of the source code. They expect it to refer to the
+ # setup.py script.
+ sys_argv_0 = sys.argv[0]
+ sys.argv[0] = setup_script
+
+ try:
+ super(_BuildMetaLegacyBackend,
+ self).run_setup(setup_script=setup_script)
+ finally:
+ # While PEP 517 frontends should be calling each hook in a fresh
+ # subprocess according to the standard (and thus it should not be
+ # strictly necessary to restore the old sys.path), we'll restore
+ # the original path so that the path manipulation does not persist
+ # within the hook after run_setup is called.
+ sys.path[:] = sys_path
+ sys.argv[0] = sys_argv_0
+
+
+# The primary backend
+_BACKEND = _BuildMetaBackend()
+
+get_requires_for_build_wheel = _BACKEND.get_requires_for_build_wheel
+get_requires_for_build_sdist = _BACKEND.get_requires_for_build_sdist
+prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel
+build_wheel = _BACKEND.build_wheel
+build_sdist = _BACKEND.build_sdist
+
+
+# The legacy backend
+__legacy__ = _BuildMetaLegacyBackend()