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"""
Monkey patching of distutils.
"""
from __future__ import annotations
import inspect
import platform
import sys
import types
from typing import TypeVar, cast, overload
import distutils.filelist
_T = TypeVar("_T")
_UnpatchT = TypeVar("_UnpatchT", type, types.FunctionType)
__all__: list[str] = []
"""
Everything is private. Contact the project team
if you think you need this functionality.
"""
def _get_mro(cls):
"""
Returns the bases classes for cls sorted by the MRO.
Works around an issue on Jython where inspect.getmro will not return all
base classes if multiple classes share the same name. Instead, this
function will return a tuple containing the class itself, and the contents
of cls.__bases__. See https://github.com/pypa/setuptools/issues/1024.
"""
if platform.python_implementation() == "Jython":
return (cls,) + cls.__bases__
return inspect.getmro(cls)
@overload
def get_unpatched(item: _UnpatchT) -> _UnpatchT: ...
@overload
def get_unpatched(item: object) -> None: ...
def get_unpatched(
item: type | types.FunctionType | object,
) -> type | types.FunctionType | None:
if isinstance(item, type):
return get_unpatched_class(item)
if isinstance(item, types.FunctionType):
return get_unpatched_function(item)
return None
def get_unpatched_class(cls: type[_T]) -> type[_T]:
"""Protect against re-patching the distutils if reloaded
Also ensures that no other distutils extension monkeypatched the distutils
first.
"""
external_bases = (
cast(type[_T], cls)
for cls in _get_mro(cls)
if not cls.__module__.startswith('setuptools')
)
base = next(external_bases)
if not base.__module__.startswith('distutils'):
msg = f"distutils has already been patched by {cls!r}"
raise AssertionError(msg)
return base
def patch_all():
import setuptools
# we can't patch distutils.cmd, alas
distutils.core.Command = setuptools.Command # type: ignore[misc,assignment] # monkeypatching
_patch_distribution_metadata()
# Install Distribution throughout the distutils
for module in distutils.dist, distutils.core, distutils.cmd:
module.Distribution = setuptools.dist.Distribution
# Install the patched Extension
distutils.core.Extension = setuptools.extension.Extension # type: ignore[misc,assignment] # monkeypatching
distutils.extension.Extension = setuptools.extension.Extension # type: ignore[misc,assignment] # monkeypatching
if 'distutils.command.build_ext' in sys.modules:
sys.modules[
'distutils.command.build_ext'
].Extension = setuptools.extension.Extension
def _patch_distribution_metadata():
from . import _core_metadata
"""Patch write_pkg_file and read_pkg_file for higher metadata standards"""
for attr in (
'write_pkg_info',
'write_pkg_file',
'read_pkg_file',
'get_metadata_version',
'get_fullname',
):
new_val = getattr(_core_metadata, attr)
setattr(distutils.dist.DistributionMetadata, attr, new_val)
def patch_func(replacement, target_mod, func_name):
"""
Patch func_name in target_mod with replacement
Important - original must be resolved by name to avoid
patching an already patched function.
"""
original = getattr(target_mod, func_name)
# set the 'unpatched' attribute on the replacement to
# point to the original.
vars(replacement).setdefault('unpatched', original)
# replace the function in the original module
setattr(target_mod, func_name, replacement)
def get_unpatched_function(candidate):
return candidate.unpatched
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