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import functools import logging import os import pathlib import sys import sysconfig from typing import Any, Dict, Generator, Optional, Tuple from pip._internal.models.scheme import SCHEME_KEYS, Scheme from pip._internal.utils.compat import WINDOWS from pip._internal.utils.deprecation import deprecated from pip._internal.utils.virtualenv import running_under_virtualenv from . import _sysconfig from .base import ( USER_CACHE_DIR, get_major_minor_version, get_src_prefix, is_osx_framework, site_packages, user_site, ) __all__ = [ "USER_CACHE_DIR", "get_bin_prefix", "get_bin_user", "get_major_minor_version", "get_platlib", "get_purelib", "get_scheme", "get_src_prefix", "site_packages", "user_site", ] logger = logging.getLogger(__name__) _PLATLIBDIR: str = getattr(sys, "platlibdir", "lib") _USE_SYSCONFIG_DEFAULT = sys.version_info >= (3, 10) def _should_use_sysconfig() -> bool: """This function determines the value of _USE_SYSCONFIG. By default, pip uses sysconfig on Python 3.10+. But Python distributors can override this decision by setting: sysconfig._PIP_USE_SYSCONFIG = True / False Rationale in https://github.com/pypa/pip/issues/10647 This is a function for testability, but should be constant during any one run. """ return bool(getattr(sysconfig, "_PIP_USE_SYSCONFIG", _USE_SYSCONFIG_DEFAULT)) _USE_SYSCONFIG = _should_use_sysconfig() if not _USE_SYSCONFIG: # Import distutils lazily to avoid deprecation warnings, # but import it soon enough that it is in memory and available during # a pip reinstall. from . import _distutils # Be noisy about incompatibilities if this platforms "should" be using # sysconfig, but is explicitly opting out and using distutils instead. if _USE_SYSCONFIG_DEFAULT and not _USE_SYSCONFIG: _MISMATCH_LEVEL = logging.WARNING else: _MISMATCH_LEVEL = logging.DEBUG def _looks_like_bpo_44860() -> bool: """The resolution to bpo-44860 will change this incorrect platlib. See <https://bugs.python.org/issue44860>. """ from distutils.command.install import INSTALL_SCHEMES try: unix_user_platlib = INSTALL_SCHEMES["unix_user"]["platlib"] except KeyError: return False return unix_user_platlib == "$usersite" def _looks_like_red_hat_patched_platlib_purelib(scheme: Dict[str, str]) -> bool: platlib = scheme["platlib"] if "/$platlibdir/" in platlib: platlib = platlib.replace("/$platlibdir/", f"/{_PLATLIBDIR}/") if "/lib64/" not in platlib: return False unpatched = platlib.replace("/lib64/", "/lib/") return unpatched.replace("$platbase/", "$base/") == scheme["purelib"] @functools.lru_cache(maxsize=None) def _looks_like_red_hat_lib() -> bool: """Red Hat patches platlib in unix_prefix and unix_home, but not purelib. This is the only way I can see to tell a Red Hat-patched Python. """ from distutils.command.install import INSTALL_SCHEMES return all( k in INSTALL_SCHEMES and _looks_like_red_hat_patched_platlib_purelib(INSTALL_SCHEMES[k]) for k in ("unix_prefix", "unix_home") ) @functools.lru_cache(maxsize=None) def _looks_like_debian_scheme() -> bool: """Debian adds two additional schemes.""" from distutils.command.install import INSTALL_SCHEMES return "deb_system" in INSTALL_SCHEMES and "unix_local" in INSTALL_SCHEMES @functools.lru_cache(maxsize=None) def _looks_like_red_hat_scheme() -> bool: """Red Hat patches ``sys.prefix`` and ``sys.exec_prefix``. Red Hat's ``00251-change-user-install-location.patch`` changes the install command's ``prefix`` and ``exec_prefix`` to append ``"/local"``. This is (fortunately?) done quite unconditionally, so we create a default command object without any configuration to detect this. """ from distutils.command.install import install from distutils.dist import Distribution cmd: Any = install(Distribution()) cmd.finalize_options() return ( cmd.exec_prefix == f"{os.path.normpath(sys.exec_prefix)}/local" and cmd.prefix == f"{os.path.normpath(sys.prefix)}/local" ) @functools.lru_cache(maxsize=None) def _looks_like_slackware_scheme() -> bool: """Slackware patches sysconfig but fails to patch distutils and site. Slackware changes sysconfig's user scheme to use ``"lib64"`` for the lib path, but does not do the same to the site module. """ if user_site is None: # User-site not available. return False try: paths = sysconfig.get_paths(scheme="posix_user", expand=False) except KeyError: # User-site not available. return False return "/lib64/" in paths["purelib"] and "/lib64/" not in user_site @functools.lru_cache(maxsize=None) def _looks_like_msys2_mingw_scheme() -> bool: """MSYS2 patches distutils and sysconfig to use a UNIX-like scheme. However, MSYS2 incorrectly patches sysconfig ``nt`` scheme. The fix is likely going to be included in their 3.10 release, so we ignore the warning. See msys2/MINGW-packages#9319. MSYS2 MINGW's patch uses lowercase ``"lib"`` instead of the usual uppercase, and is missing the final ``"site-packages"``. """ paths = sysconfig.get_paths("nt", expand=False) return all( "Lib" not in p and "lib" in p and not p.endswith("site-packages") for p in (paths[key] for key in ("platlib", "purelib")) ) def _fix_abiflags(parts: Tuple[str]) -> Generator[str, None, None]: ldversion = sysconfig.get_config_var("LDVERSION") abiflags = getattr(sys, "abiflags", None) # LDVERSION does not end with sys.abiflags. Just return the path unchanged. if not ldversion or not abiflags or not ldversion.endswith(abiflags): yield from parts return # Strip sys.abiflags from LDVERSION-based path components. for part in parts: if part.endswith(ldversion): part = part[: (0 - len(abiflags))] yield part @functools.lru_cache(maxsize=None) def _warn_mismatched(old: pathlib.Path, new: pathlib.Path, *, key: str) -> None: issue_url = "https://github.com/pypa/pip/issues/10151" message = ( "Value for %s does not match. Please report this to <%s>" "\ndistutils: %s" "\nsysconfig: %s" ) logger.log(_MISMATCH_LEVEL, message, key, issue_url, old, new) def _warn_if_mismatch(old: pathlib.Path, new: pathlib.Path, *, key: str) -> bool: if old == new: return False _warn_mismatched(old, new, key=key) return True @functools.lru_cache(maxsize=None) def _log_context( *, user: bool = False, home: Optional[str] = None, root: Optional[str] = None, prefix: Optional[str] = None, ) -> None: parts = [ "Additional context:", "user = %r", "home = %r", "root = %r", "prefix = %r", ] logger.log(_MISMATCH_LEVEL, "\n".join(parts), user, home, root, prefix) def get_scheme( dist_name: str, user: bool = False, home: Optional[str] = None, root: Optional[str] = None, isolated: bool = False, prefix: Optional[str] = None, ) -> Scheme: new = _sysconfig.get_scheme( dist_name, user=user, home=home, root=root, isolated=isolated, prefix=prefix, ) if _USE_SYSCONFIG: return new old = _distutils.get_scheme( dist_name, user=user, home=home, root=root, isolated=isolated, prefix=prefix, ) warning_contexts = [] for k in SCHEME_KEYS: old_v = pathlib.Path(getattr(old, k)) new_v = pathlib.Path(getattr(new, k)) if old_v == new_v: continue # distutils incorrectly put PyPy packages under ``site-packages/python`` # in the ``posix_home`` scheme, but PyPy devs said they expect the # directory name to be ``pypy`` instead. So we treat this as a bug fix # and not warn about it. See bpo-43307 and python/cpython#24628. skip_pypy_special_case = ( sys.implementation.name == "pypy" and home is not None and k in ("platlib", "purelib") and old_v.parent == new_v.parent and old_v.name.startswith("python") and new_v.name.startswith("pypy") ) if skip_pypy_special_case: continue # sysconfig's ``osx_framework_user`` does not include ``pythonX.Y`` in # the ``include`` value, but distutils's ``headers`` does. We'll let # CPython decide whether this is a bug or feature. See bpo-43948. skip_osx_framework_user_special_case = ( user and is_osx_framework() and k == "headers" and old_v.parent.parent == new_v.parent and old_v.parent.name.startswith("python") ) if skip_osx_framework_user_special_case: continue # On Red Hat and derived Linux distributions, distutils is patched to # use "lib64" instead of "lib" for platlib. if k == "platlib" and _looks_like_red_hat_lib(): continue # On Python 3.9+, sysconfig's posix_user scheme sets platlib against # sys.platlibdir, but distutils's unix_user incorrectly coninutes # using the same $usersite for both platlib and purelib. This creates a # mismatch when sys.platlibdir is not "lib". skip_bpo_44860 = ( user and k == "platlib" and not WINDOWS and sys.version_info >= (3, 9) and _PLATLIBDIR != "lib" and _looks_like_bpo_44860() ) if skip_bpo_44860: continue # Slackware incorrectly patches posix_user to use lib64 instead of lib, # but not usersite to match the location. skip_slackware_user_scheme = ( user and k in ("platlib", "purelib") and not WINDOWS and _looks_like_slackware_scheme() ) if skip_slackware_user_scheme: continue # Both Debian and Red Hat patch Python to place the system site under # /usr/local instead of /usr. Debian also places lib in dist-packages # instead of site-packages, but the /usr/local check should cover it. skip_linux_system_special_case = ( not (user or home or prefix or running_under_virtualenv()) and old_v.parts[1:3] == ("usr", "local") and len(new_v.parts) > 1 and new_v.parts[1] == "usr" and (len(new_v.parts) < 3 or new_v.parts[2] != "local") and (_looks_like_red_hat_scheme() or _looks_like_debian_scheme()) ) if skip_linux_system_special_case: continue # On Python 3.7 and earlier, sysconfig does not include sys.abiflags in # the "pythonX.Y" part of the path, but distutils does. skip_sysconfig_abiflag_bug = ( sys.version_info < (3, 8) and not WINDOWS and k in ("headers", "platlib", "purelib") and tuple(_fix_abiflags(old_v.parts)) == new_v.parts ) if skip_sysconfig_abiflag_bug: continue # MSYS2 MINGW's sysconfig patch does not include the "site-packages" # part of the path. This is incorrect and will be fixed in MSYS. skip_msys2_mingw_bug = ( WINDOWS and k in ("platlib", "purelib") and _looks_like_msys2_mingw_scheme() ) if skip_msys2_mingw_bug: continue # CPython's POSIX install script invokes pip (via ensurepip) against the # interpreter located in the source tree, not the install site. This # triggers special logic in sysconfig that's not present in distutils. # https://github.com/python/cpython/blob/8c21941ddaf/Lib/sysconfig.py#L178-L194 skip_cpython_build = ( sysconfig.is_python_build(check_home=True) and not WINDOWS and k in ("headers", "include", "platinclude") ) if skip_cpython_build: continue warning_contexts.append((old_v, new_v, f"scheme.{k}")) if not warning_contexts: return old # Check if this path mismatch is caused by distutils config files. Those # files will no longer work once we switch to sysconfig, so this raises a # deprecation message for them. default_old = _distutils.distutils_scheme( dist_name, user, home, root, isolated, prefix, ignore_config_files=True, ) if any(default_old[k] != getattr(old, k) for k in SCHEME_KEYS): deprecated( reason=( "Configuring installation scheme with distutils config files " "is deprecated and will no longer work in the near future. If you " "are using a Homebrew or Linuxbrew Python, please see discussion " "at https://github.com/Homebrew/homebrew-core/issues/76621" ), replacement=None, gone_in=None, ) return old # Post warnings about this mismatch so user can report them back. for old_v, new_v, key in warning_contexts: _warn_mismatched(old_v, new_v, key=key) _log_context(user=user, home=home, root=root, prefix=prefix) return old def get_bin_prefix() -> str: new = _sysconfig.get_bin_prefix() if _USE_SYSCONFIG: return new old = _distutils.get_bin_prefix() if _warn_if_mismatch(pathlib.Path(old), pathlib.Path(new), key="bin_prefix"): _log_context() return old def get_bin_user() -> str: return _sysconfig.get_scheme("", user=True).scripts def _looks_like_deb_system_dist_packages(value: str) -> bool: """Check if the value is Debian's APT-controlled dist-packages. Debian's ``distutils.sysconfig.get_python_lib()`` implementation returns the default package path controlled by APT, but does not patch ``sysconfig`` to do the same. This is similar to the bug worked around in ``get_scheme()``, but here the default is ``deb_system`` instead of ``unix_local``. Ultimately we can't do anything about this Debian bug, and this detection allows us to skip the warning when needed. """ if not _looks_like_debian_scheme(): return False if value == "/usr/lib/python3/dist-packages": return True return False def get_purelib() -> str: """Return the default pure-Python lib location.""" new = _sysconfig.get_purelib() if _USE_SYSCONFIG: return new old = _distutils.get_purelib() if _looks_like_deb_system_dist_packages(old): return old if _warn_if_mismatch(pathlib.Path(old), pathlib.Path(new), key="purelib"): _log_context() return old def get_platlib() -> str: """Return the default platform-shared lib location.""" new = _sysconfig.get_platlib() if _USE_SYSCONFIG: return new from . import _distutils old = _distutils.get_platlib() if _looks_like_deb_system_dist_packages(old): return old if _warn_if_mismatch(pathlib.Path(old), pathlib.Path(new), key="platlib"): _log_context() return old