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The code I came up with works with mypy for versions of Python >= 3.12, but for 3.11 and 3.10 it still complains that _BASE_CLASS isn't a static type. The problem is that in those versions `pathlib.Path` is a factory instead of a type. But we can side step that because this hack exists for Windows and only, and just directly inherit the WindowsPath
71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# Copyright 2021 The Meson development team
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'''
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This module soly exists to work around a pathlib.resolve bug on
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certain Windows systems:
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https://github.com/mesonbuild/meson/issues/7295
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https://bugs.python.org/issue31842
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It should **never** be used directly. Instead, it is automatically
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used when `import pathlib` is used. This is achieved by messing with
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`sys.modules['pathlib']` in mesonmain.
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Additionally, the sole purpose of this module is to work around a
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python bug. This only bugfixes to pathlib functions and classes are
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allowed here. Finally, this file should be removed once all upstream
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python bugs are fixed and it is OK to tell our users to "just upgrade
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python".
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'''
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from __future__ import annotations
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import pathlib
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import os
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import platform
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__all__ = [
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'PurePath',
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'PurePosixPath',
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'PureWindowsPath',
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'Path',
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]
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PurePath = pathlib.PurePath
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PurePosixPath = pathlib.PurePosixPath
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PureWindowsPath = pathlib.PureWindowsPath
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# Only patch on platforms where the bug occurs
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if platform.system().lower() == 'windows':
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# Can not directly inherit from pathlib.Path because the __new__
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# operator of pathlib.Path() returns a {Posix,Windows}Path object
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# until Python 3.12, when this was changed so that Path can be directly
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# inherited.
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#
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# Since this particular code path is only relevant to Windows, just inherit
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# WindowsPath directly.
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class _Path(pathlib.WindowsPath):
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def resolve(self, strict: bool = False) -> _Path:
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'''
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Work around a resolve bug on certain Windows systems:
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https://github.com/mesonbuild/meson/issues/7295
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https://bugs.python.org/issue31842
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'''
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try:
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return super().resolve(strict=strict)
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except OSError:
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return _Path(os.path.normpath(self))
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Path: type[pathlib.Path] = _Path
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else:
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Path = pathlib.Path
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PosixPath = pathlib.PosixPath
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WindowsPath = pathlib.WindowsPath
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__all__ += [
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'PosixPath',
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'WindowsPath',
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]
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