diff options
Diffstat (limited to 'Modules/getpath.py')
| -rw-r--r-- | Modules/getpath.py | 727 |
1 files changed, 727 insertions, 0 deletions
diff --git a/Modules/getpath.py b/Modules/getpath.py new file mode 100644 index 0000000..2eadfba --- /dev/null +++ b/Modules/getpath.py @@ -0,0 +1,727 @@ +# ****************************************************************************** +# getpath.py +# ****************************************************************************** + +# This script is designed to be precompiled to bytecode, frozen into the +# main binary, and then directly evaluated. It is not an importable module, +# and does not import any other modules (besides winreg on Windows). +# Rather, the values listed below must be specified in the globals dict +# used when evaluating the bytecode. + +# See _PyConfig_InitPathConfig in Modules/getpath.c for the execution. + +# ****************************************************************************** +# REQUIRED GLOBALS +# ****************************************************************************** + +# ** Helper functions ** +# abspath(path) -- make relative paths absolute against CWD +# basename(path) -- the filename of path +# dirname(path) -- the directory name of path +# hassuffix(path, suffix) -- returns True if path has suffix +# isabs(path) -- path is absolute or not +# isdir(path) -- path exists and is a directory +# isfile(path) -- path exists and is a file +# isxfile(path) -- path exists and is an executable file +# joinpath(*paths) -- combine the paths +# readlines(path) -- a list of each line of text in the UTF-8 encoded file +# realpath(path) -- resolves symlinks in path +# warn(message) -- print a warning (if enabled) + +# ** Values known at compile time ** +# os_name -- [in] one of 'nt', 'posix', 'darwin' +# PREFIX -- [in] sysconfig.get_config_var(...) +# EXEC_PREFIX -- [in] sysconfig.get_config_var(...) +# PYTHONPATH -- [in] sysconfig.get_config_var(...) +# VPATH -- [in] sysconfig.get_config_var(...) +# PLATLIBDIR -- [in] sysconfig.get_config_var(...) +# PYDEBUGEXT -- [in, opt] '_d' on Windows for debug builds +# EXE_SUFFIX -- [in, opt] '.exe' on Windows/Cygwin/similar +# VERSION_MAJOR -- [in] sys.version_info.major +# VERSION_MINOR -- [in] sys.version_info.minor +# PYWINVER -- [in] the Windows platform-specific version (e.g. 3.8-32) + +# ** Values read from the environment ** +# There is no need to check the use_environment flag before reading +# these, as the flag will be tested in this script. +# Also note that ENV_PYTHONPATH is read from config['pythonpath_env'] +# to allow for embedders who choose to specify it via that struct. +# ENV_PATH -- [in] getenv(...) +# ENV_PYTHONHOME -- [in] getenv(...) +# ENV_PYTHONEXECUTABLE -- [in] getenv(...) +# ENV___PYVENV_LAUNCHER__ -- [in] getenv(...) + +# ** Values calculated at runtime ** +# config -- [in/out] dict of the PyConfig structure +# real_executable -- [in, optional] resolved path to main process +# On Windows and macOS, read directly from the running process +# Otherwise, leave None and it will be calculated from executable +# executable_dir -- [in, optional] real directory containing binary +# If None, will be calculated from real_executable or executable +# py_setpath -- [in] argument provided to Py_SetPath +# If None, 'prefix' and 'exec_prefix' may be updated in config +# library -- [in, optional] path of dylib/DLL/so +# Only used for locating ._pth files +# winreg -- [in, optional] the winreg module (only on Windows) + +# ****************************************************************************** +# HIGH-LEVEL ALGORITHM +# ****************************************************************************** + +# IMPORTANT: The code is the actual specification at time of writing. +# This prose description is based on the original comment from the old +# getpath.c to help capture the intent, but should not be considered +# a specification. + +# Search in some common locations for the associated Python libraries. + +# Two directories must be found, the platform independent directory +# (prefix), containing the common .py and .pyc files, and the platform +# dependent directory (exec_prefix), containing the shared library +# modules. Note that prefix and exec_prefix can be the same directory, +# but for some installations, they are different. + +# This script carries out separate searches for prefix and exec_prefix. +# Each search tries a number of different locations until a ``landmark'' +# file or directory is found. If no prefix or exec_prefix is found, a +# warning message is issued and the preprocessor defined PREFIX and +# EXEC_PREFIX are used (even though they will not work); python carries on +# as best as is possible, but most imports will fail. + +# Before any searches are done, the location of the executable is +# determined. If Py_SetPath() was called, or if we are running on +# Windows, the 'real_executable' path is used (if known). Otherwise, +# we use the config-specified program name or default to argv[0]. +# If this has one or more slashes in it, it is made absolute against +# the current working directory. If it only contains a name, it must +# have been invoked from the shell's path, so we search $PATH for the +# named executable and use that. If the executable was not found on +# $PATH (or there was no $PATH environment variable), the original +# argv[0] string is used. + +# At this point, provided Py_SetPath was not used, the +# __PYVENV_LAUNCHER__ variable may override the executable (on macOS, +# the PYTHON_EXECUTABLE variable may also override). This allows +# certain launchers that run Python as a subprocess to properly +# specify the executable path. They are not intended for users. + +# Next, the executable location is examined to see if it is a symbolic +# link. If so, the link is realpath-ed and the directory of the link +# target is used for the remaining searches. The same steps are +# performed for prefix and for exec_prefix, but with different landmarks. + +# Step 1. Are we running in a virtual environment? Unless 'home' has +# been specified another way, check for a pyvenv.cfg and use its 'home' +# property to override the executable dir used later for prefix searches. +# We do not activate the venv here - that is performed later by site.py. + +# Step 2. Is there a ._pth file? A ._pth file lives adjacent to the +# runtime library (if any) or the actual executable (not the symlink), +# and contains precisely the intended contents of sys.path as relative +# paths (to its own location). Its presence also enables isolated mode +# and suppresses other environment variable usage. Unless already +# specified by Py_SetHome(), the directory containing the ._pth file is +# set as 'home'. + +# Step 3. Are we running python out of the build directory? This is +# checked by looking for the BUILDDIR_TXT file, which contains the +# relative path to the platlib dir. The executable_dir value is +# derived from joining the VPATH preprocessor variable to the +# directory containing pybuilddir.txt. If it is not found, the +# BUILD_LANDMARK file is found, which is part of the source tree. +# prefix is then found by searching up for a file that should only +# exist in the source tree, and the stdlib dir is set to prefix/Lib. + +# Step 4. If 'home' is set, either by Py_SetHome(), ENV_PYTHONHOME, +# a pyvenv.cfg file, ._pth file, or by detecting a build directory, it +# is assumed to point to prefix and exec_prefix. $PYTHONHOME can be a +# single directory, which is used for both, or the prefix and exec_prefix +# directories separated by DELIM (colon on POSIX; semicolon on Windows). + +# Step 5. Try to find prefix and exec_prefix relative to executable_dir, +# backtracking up the path until it is exhausted. This is the most common +# step to succeed. Note that if prefix and exec_prefix are different, +# exec_prefix is more likely to be found; however if exec_prefix is a +# subdirectory of prefix, both will be found. + +# Step 6. Search the directories pointed to by the preprocessor variables +# PREFIX and EXEC_PREFIX. These are supplied by the Makefile but can be +# passed in as options to the configure script. + +# That's it! + +# Well, almost. Once we have determined prefix and exec_prefix, the +# preprocessor variable PYTHONPATH is used to construct a path. Each +# relative path on PYTHONPATH is prefixed with prefix. Then the directory +# containing the shared library modules is appended. The environment +# variable $PYTHONPATH is inserted in front of it all. On POSIX, if we are +# in a build directory, both prefix and exec_prefix are reset to the +# corresponding preprocessor variables (so sys.prefix will reflect the +# installation location, even though sys.path points into the build +# directory). This seems to make more sense given that currently the only +# known use of sys.prefix and sys.exec_prefix is for the ILU installation +# process to find the installed Python tree. + +# An embedding application can use Py_SetPath() to override all of +# these automatic path computations. + + +# ****************************************************************************** +# PLATFORM CONSTANTS +# ****************************************************************************** + +platlibdir = config.get('platlibdir') or PLATLIBDIR + +if os_name == 'posix' or os_name == 'darwin': + BUILDDIR_TXT = 'pybuilddir.txt' + BUILD_LANDMARK = 'Modules/Setup.local' + DEFAULT_PROGRAM_NAME = f'python{VERSION_MAJOR}' + STDLIB_SUBDIR = f'{platlibdir}/python{VERSION_MAJOR}.{VERSION_MINOR}' + STDLIB_LANDMARKS = [f'{STDLIB_SUBDIR}/os.py', f'{STDLIB_SUBDIR}/os.pyc'] + PLATSTDLIB_LANDMARK = f'{platlibdir}/python{VERSION_MAJOR}.{VERSION_MINOR}/lib-dynload' + BUILDSTDLIB_LANDMARKS = ['Lib/os.py'] + VENV_LANDMARK = 'pyvenv.cfg' + ZIP_LANDMARK = f'{platlibdir}/python{VERSION_MAJOR}{VERSION_MINOR}.zip' + DELIM = ':' + SEP = '/' + +elif os_name == 'nt': + BUILDDIR_TXT = 'pybuilddir.txt' + BUILD_LANDMARK = r'..\..\Modules\Setup.local' + DEFAULT_PROGRAM_NAME = f'python' + STDLIB_SUBDIR = 'Lib' + STDLIB_LANDMARKS = [f'{STDLIB_SUBDIR}\\os.py', f'{STDLIB_SUBDIR}\\os.pyc'] + PLATSTDLIB_LANDMARK = f'{platlibdir}' + BUILDSTDLIB_LANDMARKS = ['Lib\\os.py'] + VENV_LANDMARK = 'pyvenv.cfg' + ZIP_LANDMARK = f'python{VERSION_MAJOR}{VERSION_MINOR}{PYDEBUGEXT or ""}.zip' + WINREG_KEY = f'SOFTWARE\\Python\\PythonCore\\{PYWINVER}\\PythonPath' + DELIM = ';' + SEP = '\\' + + +# ****************************************************************************** +# HELPER FUNCTIONS (note that we prefer C functions for performance) +# ****************************************************************************** + +def search_up(prefix, *landmarks, test=isfile): + while prefix: + if any(test(joinpath(prefix, f)) for f in landmarks): + return prefix + prefix = dirname(prefix) + + +# ****************************************************************************** +# READ VARIABLES FROM config +# ****************************************************************************** + +program_name = config.get('program_name') +home = config.get('home') +executable = config.get('executable') +base_executable = config.get('base_executable') +prefix = config.get('prefix') +exec_prefix = config.get('exec_prefix') +base_prefix = config.get('base_prefix') +base_exec_prefix = config.get('base_exec_prefix') +ENV_PYTHONPATH = config['pythonpath_env'] +use_environment = config.get('use_environment', 1) + +pythonpath = config.get('module_search_paths') + +real_executable_dir = None +stdlib_dir = None +platstdlib_dir = None + +# ****************************************************************************** +# CALCULATE program_name +# ****************************************************************************** + +program_name_was_set = bool(program_name) + +if not program_name: + try: + program_name = config.get('orig_argv', [])[0] + except IndexError: + pass + +if not program_name: + program_name = DEFAULT_PROGRAM_NAME + +if EXE_SUFFIX and not hassuffix(program_name, EXE_SUFFIX) and isxfile(program_name + EXE_SUFFIX): + program_name = program_name + EXE_SUFFIX + + +# ****************************************************************************** +# CALCULATE executable +# ****************************************************************************** + +if py_setpath: + # When Py_SetPath has been called, executable defaults to + # the real executable path. + if not executable: + executable = real_executable + +if not executable and SEP in program_name: + # Resolve partial path program_name against current directory + executable = abspath(program_name) + +if not executable: + # All platforms default to real_executable if known at this + # stage. POSIX does not set this value. + executable = real_executable +elif os_name == 'darwin': + # QUIRK: On macOS we may know the real executable path, but + # if our caller has lied to us about it (e.g. most of + # test_embed), we need to use their path in order to detect + # whether we are in a build tree. This is true even if the + # executable path was provided in the config. + real_executable = executable + +if not executable and program_name: + # Resolve names against PATH. + # NOTE: The use_environment value is ignored for this lookup. + # To properly isolate, launch Python with a full path. + for p in ENV_PATH.split(DELIM): + p = joinpath(p, program_name) + if isxfile(p): + executable = p + break + +if not executable: + executable = '' + # When we cannot calculate the executable, subsequent searches + # look in the current working directory. Here, we emulate that + # (the former getpath.c would do it apparently by accident). + executable_dir = abspath('.') + # Also need to set this fallback in case we are running from a + # build directory with an invalid argv0 (i.e. test_sys.test_executable) + real_executable_dir = executable_dir + +if ENV_PYTHONEXECUTABLE or ENV___PYVENV_LAUNCHER__: + # If set, these variables imply that we should be using them as + # sys.executable and when searching for venvs. However, we should + # use the argv0 path for prefix calculation + base_executable = executable + if not real_executable: + real_executable = executable + executable = ENV_PYTHONEXECUTABLE or ENV___PYVENV_LAUNCHER__ + executable_dir = dirname(executable) + + +# ****************************************************************************** +# CALCULATE (default) home +# ****************************************************************************** + +# Used later to distinguish between Py_SetPythonHome and other +# ways that it may have been set +home_was_set = False + +if home: + home_was_set = True +elif use_environment and ENV_PYTHONHOME and not py_setpath: + home = ENV_PYTHONHOME + + +# ****************************************************************************** +# READ pyvenv.cfg +# ****************************************************************************** + +venv_prefix = None + +# Calling Py_SetPythonHome(), Py_SetPath() or +# setting $PYTHONHOME will override venv detection. +if not home and not py_setpath: + try: + # prefix2 is just to avoid calculating dirname again later, + # as the path in venv_prefix is the more common case. + venv_prefix2 = executable_dir or dirname(executable) + venv_prefix = dirname(venv_prefix2) + try: + # Read pyvenv.cfg from one level above executable + pyvenvcfg = readlines(joinpath(venv_prefix, VENV_LANDMARK)) + except FileNotFoundError: + # Try the same directory as executable + pyvenvcfg = readlines(joinpath(venv_prefix2, VENV_LANDMARK)) + venv_prefix = venv_prefix2 + except FileNotFoundError: + venv_prefix = None + pyvenvcfg = [] + + for line in pyvenvcfg: + key, had_equ, value = line.partition('=') + if had_equ and key.strip().lower() == 'home': + executable_dir = real_executable_dir = value.strip() + base_executable = joinpath(executable_dir, basename(executable)) + break + else: + venv_prefix = None + + +# ****************************************************************************** +# CALCULATE base_executable, real_executable AND executable_dir +# ****************************************************************************** + +if not base_executable: + base_executable = executable or real_executable or '' + +if not real_executable: + real_executable = base_executable + +try: + real_executable = realpath(real_executable) +except OSError as ex: + # Only warn if the file actually exists and was unresolvable + # Otherwise users who specify a fake executable may get spurious warnings. + if isfile(real_executable): + warn(f'Failed to find real location of {base_executable}') + +if not executable_dir and os_name == 'darwin' and library: + # QUIRK: macOS checks adjacent to its library early + library_dir = dirname(library) + if any(isfile(joinpath(library_dir, p)) for p in STDLIB_LANDMARKS): + # Exceptions here should abort the whole process (to match + # previous behavior) + executable_dir = realpath(library_dir) + real_executable_dir = executable_dir + +# If we do not have the executable's directory, we can calculate it. +# This is the directory used to find prefix/exec_prefix if necessary. +if not executable_dir: + executable_dir = real_executable_dir = dirname(real_executable) + +# If we do not have the real executable's directory, we calculate it. +# This is the directory used to detect build layouts. +if not real_executable_dir: + real_executable_dir = dirname(real_executable) + +# ****************************************************************************** +# DETECT _pth FILE +# ****************************************************************************** + +# The contents of an optional ._pth file are used to totally override +# sys.path calcualation. Its presence also implies isolated mode and +# no-site (unless explicitly requested) +pth = None +pth_dir = None + +# Calling Py_SetPythonHome() or Py_SetPath() will override ._pth search, +# but environment variables and command-line options cannot. +if not py_setpath and not home_was_set: + # Check adjacent to the main DLL/dylib/so + if library: + try: + pth = readlines(library.rpartition('.')[0] + '._pth') + pth_dir = dirname(library) + except FileNotFoundError: + pass + + # Check adjacent to the original executable, even if we + # redirected to actually launch Python. This may allow a + # venv to override the base_executable's ._pth file, but + # it cannot override the library's one. + if not pth_dir: + try: + pth = readlines(executable.rpartition('.')[0] + '._pth') + pth_dir = dirname(executable) + except FileNotFoundError: + pass + + # If we found a ._pth file, disable environment and home + # detection now. Later, we will do the rest. + if pth_dir: + use_environment = 0 + home = pth_dir + pythonpath = [] + + +# ****************************************************************************** +# CHECK FOR BUILD DIRECTORY +# ****************************************************************************** + +build_prefix = None + +if not home_was_set and real_executable_dir and not py_setpath: + # Detect a build marker and use it to infer prefix, exec_prefix, + # stdlib_dir and the platstdlib_dir directories. + try: + platstdlib_dir = joinpath( + real_executable_dir, + readlines(joinpath(real_executable_dir, BUILDDIR_TXT))[0], + ) + build_prefix = joinpath(real_executable_dir, VPATH) + except FileNotFoundError: + if isfile(joinpath(real_executable_dir, BUILD_LANDMARK)): + build_prefix = joinpath(real_executable_dir, VPATH) + if os_name == 'nt': + # QUIRK: Windows builds need platstdlib_dir to be the executable + # dir. Normally the builddir marker handles this, but in this + # case we need to correct manually. + platstdlib_dir = real_executable_dir + + if build_prefix: + if os_name == 'nt': + # QUIRK: No searching for more landmarks on Windows + build_stdlib_prefix = build_prefix + else: + build_stdlib_prefix = search_up(build_prefix, *BUILDSTDLIB_LANDMARKS) + # Always use the build prefix for stdlib + if build_stdlib_prefix: + stdlib_dir = joinpath(build_stdlib_prefix, 'Lib') + else: + stdlib_dir = joinpath(build_prefix, 'Lib') + # Only use the build prefix for prefix if it hasn't already been set + if not prefix: + prefix = build_stdlib_prefix + # Do not warn, because 'prefix' never equals 'build_prefix' on POSIX + #elif not venv_prefix and prefix != build_prefix: + # warn('Detected development environment but prefix is already set') + if not exec_prefix: + exec_prefix = build_prefix + # Do not warn, because 'exec_prefix' never equals 'build_prefix' on POSIX + #elif not venv_prefix and exec_prefix != build_prefix: + # warn('Detected development environment but exec_prefix is already set') + config['_is_python_build'] = 1 + + +# ****************************************************************************** +# CALCULATE prefix AND exec_prefix +# ****************************************************************************** + +if py_setpath: + # As documented, calling Py_SetPath will force both prefix + # and exec_prefix to the empty string. + prefix = exec_prefix = '' + +else: + # Read prefix and exec_prefix from explicitly set home + if home: + # When multiple paths are listed with ':' or ';' delimiters, + # split into prefix:exec_prefix + prefix, had_delim, exec_prefix = home.partition(DELIM) + if not had_delim: + exec_prefix = prefix + + + # First try to detect prefix by looking alongside our runtime library, if known + if library and not prefix: + library_dir = dirname(library) + if ZIP_LANDMARK: + if os_name == 'nt': + # QUIRK: Windows does not search up for ZIP file + if isfile(joinpath(library_dir, ZIP_LANDMARK)): + prefix = library_dir + else: + prefix = search_up(library_dir, ZIP_LANDMARK) + if STDLIB_SUBDIR and STDLIB_LANDMARKS and not prefix: + if any(isfile(joinpath(library_dir, f)) for f in STDLIB_LANDMARKS): + prefix = library_dir + stdlib_dir = joinpath(prefix, STDLIB_SUBDIR) + + + # Detect prefix by looking for zip file + if ZIP_LANDMARK and executable_dir and not prefix: + if os_name == 'nt': + # QUIRK: Windows does not search up for ZIP file + if isfile(joinpath(executable_dir, ZIP_LANDMARK)): + prefix = executable_dir + else: + prefix = search_up(executable_dir, ZIP_LANDMARK) + if prefix: + stdlib_dir = joinpath(prefix, STDLIB_SUBDIR) + if not isdir(stdlib_dir): + stdlib_dir = None + + + # Detect prefix by searching from our executable location for the stdlib_dir + if STDLIB_SUBDIR and STDLIB_LANDMARKS and executable_dir and not prefix: + prefix = search_up(executable_dir, *STDLIB_LANDMARKS) + if prefix: + stdlib_dir = joinpath(prefix, STDLIB_SUBDIR) + + if PREFIX and not prefix: + prefix = PREFIX + if not any(isfile(joinpath(prefix, f)) for f in STDLIB_LANDMARKS): + warn('Could not find platform independent libraries <prefix>') + + if not prefix: + prefix = abspath('') + warn('Could not find platform independent libraries <prefix>') + + + # Detect exec_prefix by searching from executable for the platstdlib_dir + if PLATSTDLIB_LANDMARK and not exec_prefix: + if executable_dir: + exec_prefix = search_up(executable_dir, PLATSTDLIB_LANDMARK, test=isdir) + if not exec_prefix: + if EXEC_PREFIX: + exec_prefix = EXEC_PREFIX + if not isdir(joinpath(exec_prefix, PLATSTDLIB_LANDMARK)): + warn('Could not find platform dependent libraries <exec_prefix>') + else: + warn('Could not find platform dependent libraries <exec_prefix>') + + # Fallback: assume exec_prefix == prefix + if not exec_prefix: + exec_prefix = prefix + + + if not prefix or not exec_prefix: + warn('Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]') + + +# If we haven't set [plat]stdlib_dir already, set them now +if not stdlib_dir: + if prefix: + stdlib_dir = joinpath(prefix, STDLIB_SUBDIR) + else: + stdlib_dir = '' + +if not platstdlib_dir: + if exec_prefix: + platstdlib_dir = joinpath(exec_prefix, PLATSTDLIB_LANDMARK) + else: + platstdlib_dir = '' + + +# For a venv, update the main prefix/exec_prefix but leave the base ones unchanged +# XXX: We currently do not update prefix here, but it happens in site.py +#if venv_prefix: +# base_prefix = prefix +# base_exec_prefix = exec_prefix +# prefix = exec_prefix = venv_prefix + + +# ****************************************************************************** +# UPDATE pythonpath (sys.path) +# ****************************************************************************** + +if py_setpath: + # If Py_SetPath was called then it overrides any existing search path + config['module_search_paths'] = py_setpath.split(DELIM) + config['module_search_paths_set'] = 1 + +elif not pythonpath: + # If pythonpath was already set, we leave it alone. + # This won't matter in normal use, but if an embedded host is trying to + # recalculate paths while running then we do not want to change it. + pythonpath = [] + + # First add entries from the process environment + if use_environment and ENV_PYTHONPATH: + for p in ENV_PYTHONPATH.split(DELIM): + pythonpath.append(abspath(p)) + + # Then add the default zip file + if os_name == 'nt': + # QUIRK: Windows uses the library directory rather than the prefix + if library: + library_dir = dirname(library) + else: + library_dir = executable_dir + pythonpath.append(joinpath(library_dir, ZIP_LANDMARK)) + elif build_prefix or venv_prefix: + # QUIRK: POSIX uses the default prefix when in the build directory + # or a venv + pythonpath.append(joinpath(PREFIX, ZIP_LANDMARK)) + else: + pythonpath.append(joinpath(prefix, ZIP_LANDMARK)) + + if os_name == 'nt' and use_environment and winreg: + # QUIRK: Windows also lists paths in the registry. Paths are stored + # as the default value of each subkey of + # {HKCU,HKLM}\Software\Python\PythonCore\{winver}\PythonPath + # where winver is sys.winver (typically '3.x' or '3.x-32') + for hk in (winreg.HKEY_CURRENT_USER, winreg.HKEY_LOCAL_MACHINE): + try: + key = winreg.OpenKeyEx(hk, WINREG_KEY) + try: + i = 0 + while True: + try: + keyname = winreg.EnumKey(key, i) + subkey = winreg.OpenKeyEx(key, keyname) + if not subkey: + continue + try: + v = winreg.QueryValue(subkey) + finally: + winreg.CloseKey(subkey) + if isinstance(v, str): + pythonpath.append(v) + i += 1 + except OSError: + break + finally: + winreg.CloseKey(key) + except OSError: + pass + + # Then add any entries compiled into the PYTHONPATH macro. + if PYTHONPATH: + for p in PYTHONPATH.split(DELIM): + pythonpath.append(joinpath(prefix, p)) + + # Then add stdlib_dir and platstdlib_dir + if stdlib_dir: + pythonpath.append(stdlib_dir) + if platstdlib_dir: + if os_name == 'nt' and venv_prefix: + # QUIRK: Windows appends executable_dir instead of platstdlib_dir + # when in a venv + pythonpath.append(executable_dir) + else: + pythonpath.append(platstdlib_dir) + + config['module_search_paths'] = pythonpath + config['module_search_paths_set'] = 1 + + +# ****************************************************************************** +# POSIX prefix/exec_prefix QUIRKS +# ****************************************************************************** + +# QUIRK: Non-Windows replaces prefix/exec_prefix with defaults when running +# in build directory. This happens after pythonpath calculation. +if os_name != 'nt' and build_prefix: + prefix = config.get('prefix') or PREFIX + exec_prefix = config.get('exec_prefix') or EXEC_PREFIX or prefix + + +# ****************************************************************************** +# SET pythonpath FROM _PTH FILE +# ****************************************************************************** + +if pth: + config['isolated'] = 1 + config['use_environment'] = 0 + config['site_import'] = 0 + pythonpath = [] + for line in pth: + line = line.partition('#')[0].strip() + if not line: + pass + elif line == 'import site': + config['site_import'] = 1 + elif line.startswith('import '): + warn("unsupported 'import' line in ._pth file") + else: + pythonpath.append(joinpath(pth_dir, line)) + config['module_search_paths'] = pythonpath + config['module_search_paths_set'] = 1 + +# ****************************************************************************** +# UPDATE config FROM CALCULATED VALUES +# ****************************************************************************** + +config['program_name'] = program_name +config['home'] = home +config['executable'] = executable +config['base_executable'] = base_executable +config['prefix'] = prefix +config['exec_prefix'] = exec_prefix +config['base_prefix'] = base_prefix or prefix +config['base_exec_prefix'] = base_exec_prefix or exec_prefix + +config['platlibdir'] = platlibdir +config['stdlib_dir'] = stdlib_dir +config['platstdlib_dir'] = platstdlib_dir |