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103 lines
4.3 KiB
Python
103 lines
4.3 KiB
Python
"""Patches that are applied at runtime to the virtual environment."""
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from __future__ import annotations
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import os
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import sys
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VIRTUALENV_PATCH_FILE = os.path.join(__file__)
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def patch_dist(dist):
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"""
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Distutils allows user to configure some arguments via a configuration file:
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https://docs.python.org/3/install/index.html#distutils-configuration-files.
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Some of this arguments though don't make sense in context of the virtual environment files, let's fix them up.
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""" # noqa: D205
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# we cannot allow some install config as that would get packages installed outside of the virtual environment
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old_parse_config_files = dist.Distribution.parse_config_files
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def parse_config_files(self, *args, **kwargs):
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result = old_parse_config_files(self, *args, **kwargs)
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install = self.get_option_dict("install")
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if "prefix" in install: # the prefix governs where to install the libraries
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install["prefix"] = VIRTUALENV_PATCH_FILE, os.path.abspath(sys.prefix)
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for base in ("purelib", "platlib", "headers", "scripts", "data"):
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key = f"install_{base}"
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if key in install: # do not allow global configs to hijack venv paths
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install.pop(key, None)
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return result
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dist.Distribution.parse_config_files = parse_config_files
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# Import hook that patches some modules to ignore configuration values that break package installation in case
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# of virtual environments.
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_DISTUTILS_PATCH = "distutils.dist", "setuptools.dist"
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# https://docs.python.org/3/library/importlib.html#setting-up-an-importer
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class _Finder:
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"""A meta path finder that allows patching the imported distutils modules."""
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fullname = None
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# lock[0] is threading.Lock(), but initialized lazily to avoid importing threading very early at startup,
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# because there are gevent-based applications that need to be first to import threading by themselves.
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# See https://github.com/pypa/virtualenv/issues/1895 for details.
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lock = [] # noqa: RUF012
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def find_spec(self, fullname, path, target=None): # noqa: ARG002
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if fullname in _DISTUTILS_PATCH and self.fullname is None:
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# initialize lock[0] lazily
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if len(self.lock) == 0:
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import threading
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lock = threading.Lock()
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# there is possibility that two threads T1 and T2 are simultaneously running into find_spec,
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# observing .lock as empty, and further going into hereby initialization. However due to the GIL,
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# list.append() operation is atomic and this way only one of the threads will "win" to put the lock
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# - that every thread will use - into .lock[0].
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# https://docs.python.org/3/faq/library.html#what-kinds-of-global-value-mutation-are-thread-safe
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self.lock.append(lock)
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from functools import partial
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from importlib.util import find_spec
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with self.lock[0]:
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self.fullname = fullname
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try:
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spec = find_spec(fullname, path)
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if spec is not None:
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# https://www.python.org/dev/peps/pep-0451/#how-loading-will-work
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is_new_api = hasattr(spec.loader, "exec_module")
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func_name = "exec_module" if is_new_api else "load_module"
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old = getattr(spec.loader, func_name)
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func = self.exec_module if is_new_api else self.load_module
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if old is not func:
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try: # noqa: SIM105
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setattr(spec.loader, func_name, partial(func, old))
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except AttributeError:
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pass # C-Extension loaders are r/o such as zipimporter with <3.7
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return spec
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finally:
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self.fullname = None
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return None
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@staticmethod
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def exec_module(old, module):
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old(module)
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if module.__name__ in _DISTUTILS_PATCH:
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patch_dist(module)
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@staticmethod
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def load_module(old, name):
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module = old(name)
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if module.__name__ in _DISTUTILS_PATCH:
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patch_dist(module)
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return module
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sys.meta_path.insert(0, _Finder())
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