Mercurial > repos > shellac > sam_consensus_v3
diff env/lib/python3.9/site-packages/virtualenv/create/via_global_ref/_virtualenv.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/env/lib/python3.9/site-packages/virtualenv/create/via_global_ref/_virtualenv.py Mon Mar 22 18:12:50 2021 +0000 @@ -0,0 +1,130 @@ +"""Patches that are applied at runtime to the virtual environment""" +# -*- coding: utf-8 -*- + +import os +import sys + +VIRTUALENV_PATCH_FILE = os.path.join(__file__) + + +def patch_dist(dist): + """ + Distutils allows user to configure some arguments via a configuration file: + https://docs.python.org/3/install/index.html#distutils-configuration-files + + Some of this arguments though don't make sense in context of the virtual environment files, let's fix them up. + """ + # we cannot allow some install config as that would get packages installed outside of the virtual environment + old_parse_config_files = dist.Distribution.parse_config_files + + def parse_config_files(self, *args, **kwargs): + result = old_parse_config_files(self, *args, **kwargs) + install = self.get_option_dict("install") + + if "prefix" in install: # the prefix governs where to install the libraries + install["prefix"] = VIRTUALENV_PATCH_FILE, os.path.abspath(sys.prefix) + for base in ("purelib", "platlib", "headers", "scripts", "data"): + key = "install_{}".format(base) + if key in install: # do not allow global configs to hijack venv paths + install.pop(key, None) + return result + + dist.Distribution.parse_config_files = parse_config_files + + +# Import hook that patches some modules to ignore configuration values that break package installation in case +# of virtual environments. +_DISTUTILS_PATCH = "distutils.dist", "setuptools.dist" +if sys.version_info > (3, 4): + # https://docs.python.org/3/library/importlib.html#setting-up-an-importer + from functools import partial + from importlib.abc import MetaPathFinder + from importlib.util import find_spec + + class _Finder(MetaPathFinder): + """A meta path finder that allows patching the imported distutils modules""" + + fullname = None + + # lock[0] is threading.Lock(), but initialized lazily to avoid importing threading very early at startup, + # because there are gevent-based applications that need to be first to import threading by themselves. + # See https://github.com/pypa/virtualenv/issues/1895 for details. + lock = [] + + def find_spec(self, fullname, path, target=None): + if fullname in _DISTUTILS_PATCH and self.fullname is None: + # initialize lock[0] lazily + if len(self.lock) == 0: + import threading + + lock = threading.Lock() + # there is possibility that two threads T1 and T2 are simultaneously running into find_spec, + # observing .lock as empty, and further going into hereby initialization. However due to the GIL, + # list.append() operation is atomic and this way only one of the threads will "win" to put the lock + # - that every thread will use - into .lock[0]. + # https://docs.python.org/3/faq/library.html#what-kinds-of-global-value-mutation-are-thread-safe + self.lock.append(lock) + + with self.lock[0]: + self.fullname = fullname + try: + spec = find_spec(fullname, path) + if spec is not None: + # https://www.python.org/dev/peps/pep-0451/#how-loading-will-work + is_new_api = hasattr(spec.loader, "exec_module") + func_name = "exec_module" if is_new_api else "load_module" + old = getattr(spec.loader, func_name) + func = self.exec_module if is_new_api else self.load_module + if old is not func: + try: + setattr(spec.loader, func_name, partial(func, old)) + except AttributeError: + pass # C-Extension loaders are r/o such as zipimporter with <python 3.7 + return spec + finally: + self.fullname = None + + @staticmethod + def exec_module(old, module): + old(module) + if module.__name__ in _DISTUTILS_PATCH: + patch_dist(module) + + @staticmethod + def load_module(old, name): + module = old(name) + if module.__name__ in _DISTUTILS_PATCH: + patch_dist(module) + return module + + sys.meta_path.insert(0, _Finder()) +else: + # https://www.python.org/dev/peps/pep-0302/ + from imp import find_module + from pkgutil import ImpImporter, ImpLoader + + class _VirtualenvImporter(object, ImpImporter): + def __init__(self, path=None): + object.__init__(self) + ImpImporter.__init__(self, path) + + def find_module(self, fullname, path=None): + if fullname in _DISTUTILS_PATCH: + try: + return _VirtualenvLoader(fullname, *find_module(fullname.split(".")[-1], path)) + except ImportError: + pass + return None + + class _VirtualenvLoader(object, ImpLoader): + def __init__(self, fullname, file, filename, etc): + object.__init__(self) + ImpLoader.__init__(self, fullname, file, filename, etc) + + def load_module(self, fullname): + module = super(_VirtualenvLoader, self).load_module(fullname) + patch_dist(module) + module.__loader__ = None # distlib fallback + return module + + sys.meta_path.append(_VirtualenvImporter())