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"""Access to Python's configuration information.""" import os import sys from os.path import pardir, realpath __all__ = [ 'get_config_h_filename', 'get_config_var', 'get_config_vars', 'get_makefile_filename', 'get_path', 'get_path_names', 'get_paths', 'get_platform', 'get_python_version', 'get_scheme_names', 'parse_config_h', ] # Keys for get_config_var() that are never converted to Python integers. _ALWAYS_STR = { 'MACOSX_DEPLOYMENT_TARGET', } _INSTALL_SCHEMES = { 'posix_prefix': { 'stdlib': '{installed_base}/lib/python{py_version_short}', 'platstdlib': '{platbase}/lib/python{py_version_short}', 'purelib': '{base}/lib/python{py_version_short}/site-packages', 'platlib': '{platbase}/lib/python{py_version_short}/site-packages', 'include': '{installed_base}/include/python{py_version_short}{abiflags}', 'platinclude': '{installed_platbase}/include/python{py_version_short}{abiflags}', 'scripts': '{base}/bin', 'data': '{base}', }, 'posix_home': { 'stdlib': '{installed_base}/lib/python', 'platstdlib': '{base}/lib/python', 'purelib': '{base}/lib/python', 'platlib': '{base}/lib/python', 'include': '{installed_base}/include/python', 'platinclude': '{installed_base}/include/python', 'scripts': '{base}/bin', 'data': '{base}', }, 'nt': { 'stdlib': '{installed_base}/Lib', 'platstdlib': '{base}/Lib', 'purelib': '{base}/Lib/site-packages', 'platlib': '{base}/Lib/site-packages', 'include': '{installed_base}/Include', 'platinclude': '{installed_base}/Include', 'scripts': '{base}/Scripts', 'data': '{base}', }, # NOTE: When modifying "purelib" scheme, update site._get_path() too. 'nt_user': { 'stdlib': '{userbase}/Python{py_version_nodot}', 'platstdlib': '{userbase}/Python{py_version_nodot}', 'purelib': '{userbase}/Python{py_version_nodot}/site-packages', 'platlib': '{userbase}/Python{py_version_nodot}/site-packages', 'include': '{userbase}/Python{py_version_nodot}/Include', 'scripts': '{userbase}/Python{py_version_nodot}/Scripts', 'data': '{userbase}', }, 'posix_user': { 'stdlib': '{userbase}/lib/python{py_version_short}', 'platstdlib': '{userbase}/lib/python{py_version_short}', 'purelib': '{userbase}/lib/python{py_version_short}/site-packages', 'platlib': '{userbase}/lib/python{py_version_short}/site-packages', 'include': '{userbase}/include/python{py_version_short}', 'scripts': '{userbase}/bin', 'data': '{userbase}', }, 'osx_framework_user': { 'stdlib': '{userbase}/lib/python', 'platstdlib': '{userbase}/lib/python', 'purelib': '{userbase}/lib/python/site-packages', 'platlib': '{userbase}/lib/python/site-packages', 'include': '{userbase}/include', 'scripts': '{userbase}/bin', 'data': '{userbase}', }, } _SCHEME_KEYS = ('stdlib', 'platstdlib', 'purelib', 'platlib', 'include', 'scripts', 'data') # FIXME don't rely on sys.version here, its format is an implementation detail # of CPython, use sys.version_info or sys.hexversion _PY_VERSION = sys.version.split()[0] _PY_VERSION_SHORT = '%d.%d' % sys.version_info[:2] _PY_VERSION_SHORT_NO_DOT = '%d%d' % sys.version_info[:2] _PREFIX = os.path.normpath(sys.prefix) _BASE_PREFIX = os.path.normpath(sys.base_prefix) _EXEC_PREFIX = os.path.normpath(sys.exec_prefix) _BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix) _CONFIG_VARS = None _USER_BASE = None def _safe_realpath(path): try: return realpath(path) except OSError: return path if sys.executable: _PROJECT_BASE = os.path.dirname(_safe_realpath(sys.executable)) else: # sys.executable can be empty if argv[0] has been changed and Python is # unable to retrieve the real program name _PROJECT_BASE = _safe_realpath(os.getcwd()) if (os.name == 'nt' and _PROJECT_BASE.lower().endswith(('\\pcbuild\\win32', '\\pcbuild\\amd64'))): _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir)) # set for cross builds if "_PYTHON_PROJECT_BASE" in os.environ: _PROJECT_BASE = _safe_realpath(os.environ["_PYTHON_PROJECT_BASE"]) def _is_python_source_dir(d): for fn in ("Setup", "Setup.local"): if os.path.isfile(os.path.join(d, "Modules", fn)): return True return False _sys_home = getattr(sys, '_home', None) if os.name == 'nt': def _fix_pcbuild(d): if d and os.path.normcase(d).startswith( os.path.normcase(os.path.join(_PREFIX, "PCbuild"))): return _PREFIX return d _PROJECT_BASE = _fix_pcbuild(_PROJECT_BASE) _sys_home = _fix_pcbuild(_sys_home) def is_python_build(check_home=False): if check_home and _sys_home: return _is_python_source_dir(_sys_home) return _is_python_source_dir(_PROJECT_BASE) _PYTHON_BUILD = is_python_build(True) if _PYTHON_BUILD: for scheme in ('posix_prefix', 'posix_home'): _INSTALL_SCHEMES[scheme]['include'] = '{srcdir}/Include' _INSTALL_SCHEMES[scheme]['platinclude'] = '{projectbase}/.' def _subst_vars(s, local_vars): try: return s.format(**local_vars) except KeyError: try: return s.format(**os.environ) except KeyError as var: raise AttributeError('{%s}' % var) from None def _extend_dict(target_dict, other_dict): target_keys = target_dict.keys() for key, value in other_dict.items(): if key in target_keys: continue target_dict[key] = value def _expand_vars(scheme, vars): res = {} if vars is None: vars = {} _extend_dict(vars, get_config_vars()) for key, value in _INSTALL_SCHEMES[scheme].items(): if os.name in ('posix', 'nt'): value = os.path.expanduser(value) res[key] = os.path.normpath(_subst_vars(value, vars)) return res def _get_default_scheme(): if os.name == 'posix': # the default scheme for posix is posix_prefix return 'posix_prefix' return os.name # NOTE: site.py has copy of this function. # Sync it when modify this function. def _getuserbase(): env_base = os.environ.get("PYTHONUSERBASE", None) if env_base: return env_base def joinuser(*args): return os.path.expanduser(os.path.join(*args)) if os.name == "nt": base = os.environ.get("APPDATA") or "~" return joinuser(base, "Python") if sys.platform == "darwin" and sys._framework: return joinuser("~", "Library", sys._framework, "%d.%d" % sys.version_info[:2]) return joinuser("~", ".local") def _parse_makefile(filename, vars=None): """Parse a Makefile-style file. A dictionary containing name/value pairs is returned. If an optional dictionary is passed in as the second argument, it is used instead of a new dictionary. """ # Regexes needed for parsing Makefile (and similar syntaxes, # like old-style Setup files). import re _variable_rx = re.compile(r"([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)") _findvar1_rx = re.compile(r"\$$([A-Za-z][A-Za-z0-9_]*)$") _findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}") if vars is None: vars = {} done = {} notdone = {} with open(filename, errors="surrogateescape") as f: lines = f.readlines() for line in lines: if line.startswith('#') or line.strip() == '': continue m = _variable_rx.match(line) if m: n, v = m.group(1, 2) v = v.strip() # `$$' is a literal `$' in make tmpv = v.replace('$$', '') if "$" in tmpv: notdone[n] = v else: try: if n in _ALWAYS_STR: raise ValueError v = int(v) except ValueError: # insert literal `$' done[n] = v.replace('$$', '$') else: done[n] = v # do variable interpolation here variables = list(notdone.keys()) # Variables with a 'PY_' prefix in the makefile. These need to # be made available without that prefix through sysconfig. # Special care is needed to ensure that variable expansion works, even # if the expansion uses the name without a prefix. renamed_variables = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS') while len(variables) > 0: for name in tuple(variables): value = notdone[name] m1 = _findvar1_rx.search(value) m2 = _findvar2_rx.search(value) if m1 and m2: m = m1 if m1.start() < m2.start() else m2 else: m = m1 if m1 else m2 if m is not None: n = m.group(1) found = True if n in done: item = str(done[n]) elif n in notdone: # get it on a subsequent round found = False elif n in os.environ: # do it like make: fall back to environment item = os.environ[n] elif n in renamed_variables: if (name.startswith('PY_') and name[3:] in renamed_variables): item = "" elif 'PY_' + n in notdone: found = False else: item = str(done['PY_' + n]) else: done[n] = item = "" if found: after = value[m.end():] value = value[:m.start()] + item + after if "$" in after: notdone[name] = value else: try: if name in _ALWAYS_STR: raise ValueError value = int(value) except ValueError: done[name] = value.strip() else: done[name] = value variables.remove(name) if name.startswith('PY_') \ and name[3:] in renamed_variables: name = name[3:] if name not in done: done[name] = value else: # bogus variable reference (e.g. "prefix=$/opt/python"); # just drop it since we can't deal done[name] = value variables.remove(name) # strip spurious spaces for k, v in done.items(): if isinstance(v, str): done[k] = v.strip() # save the results in the global dictionary vars.update(done) return vars def get_makefile_filename(): """Return the path of the Makefile.""" if _PYTHON_BUILD: return os.path.join(_sys_home or _PROJECT_BASE, "Makefile") if hasattr(sys, 'abiflags'): config_dir_name = 'config-%s%s' % (_PY_VERSION_SHORT, sys.abiflags) else: config_dir_name = 'config' if hasattr(sys.implementation, '_multiarch'): config_dir_name += '-%s' % sys.implementation._multiarch return os.path.join(get_path('stdlib'), config_dir_name, 'Makefile') def _get_sysconfigdata_name(): return os.environ.get('_PYTHON_SYSCONFIGDATA_NAME', '_sysconfigdata_{abi}_{multiarch}'.format( abi=sys.abiflags, multiarch=getattr(sys.implementation, '_multiarch', ''), )) def _generate_posix_vars(): """Generate the Python module containing build-time variables.""" import pprint vars = {} # load the installed Makefile: makefile = get_makefile_filename() try: _parse_makefile(makefile, vars) except OSError as e: msg = "invalid Python installation: unable to open %s" % makefile if hasattr(e, "strerror"): msg = msg + " (%s)" % e.strerror raise OSError(msg) # load the installed pyconfig.h: config_h = get_config_h_filename() try: with open(config_h) as f: parse_config_h(f, vars) except OSError as e: msg = "invalid Python installation: unable to open %s" % config_h if hasattr(e, "strerror"): msg = msg + " (%s)" % e.strerror raise OSError(msg) # On AIX, there are wrong paths to the linker scripts in the Makefile # -- these paths are relative to the Python source, but when installed # the scripts are in another directory. if _PYTHON_BUILD: vars['BLDSHARED'] = vars['LDSHARED'] # There's a chicken-and-egg situation on OS X with regards to the # _sysconfigdata module after the changes introduced by #15298: # get_config_vars() is called by get_platform() as part of the # `make pybuilddir.txt` target -- which is a precursor to the # _sysconfigdata.py module being constructed. Unfortunately, # get_config_vars() eventually calls _init_posix(), which attempts # to import _sysconfigdata, which we won't have built yet. In order # for _init_posix() to work, if we're on Darwin, just mock up the # _sysconfigdata module manually and populate it with the build vars. # This is more than sufficient for ensuring the subsequent call to # get_platform() succeeds. name = _get_sysconfigdata_name() if 'darwin' in sys.platform: import types module = types.ModuleType(name) module.build_time_vars = vars sys.modules[name] = module pybuilddir = 'build/lib.%s-%s' % (get_platform(), _PY_VERSION_SHORT) if hasattr(sys, "gettotalrefcount"): pybuilddir += '-pydebug' os.makedirs(pybuilddir, exist_ok=True) destfile = os.path.join(pybuilddir, name + '.py') with open(destfile, 'w', encoding='utf8') as f: f.write('# system configuration generated and used by' ' the sysconfig module\n') f.write('build_time_vars = ') pprint.pprint(vars, stream=f) # Create file used for sys.path fixup -- see Modules/getpath.c with open('pybuilddir.txt', 'w', encoding='utf8') as f: f.write(pybuilddir) def _init_posix(vars): """Initialize the module as appropriate for POSIX systems.""" # _sysconfigdata is generated at build time, see _generate_posix_vars() name = _get_sysconfigdata_name() _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0) build_time_vars = _temp.build_time_vars vars.update(build_time_vars) def _init_non_posix(vars): """Initialize the module as appropriate for NT""" # set basic install directories import _imp vars['LIBDEST'] = get_path('stdlib') vars['BINLIBDEST'] = get_path('platstdlib') vars['INCLUDEPY'] = get_path('include') vars['EXT_SUFFIX'] = _imp.extension_suffixes()[0] vars['EXE'] = '.exe' vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable)) # # public APIs # def parse_config_h(fp, vars=None): """Parse a config.h-style file. A dictionary containing name/value pairs is returned. If an optional dictionary is passed in as the second argument, it is used instead of a new dictionary. """ if vars is None: vars = {} import re define_rx = re.compile("#define ([A-Z][A-Za-z0-9_]+) (.*)\n") undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-z0-9_]+) [*]/\n") while True: line = fp.readline() if not line: break m = define_rx.match(line) if m: n, v = m.group(1, 2) try: if n in _ALWAYS_STR: raise ValueError v = int(v) except ValueError: pass vars[n] = v else: m = undef_rx.match(line) if m: vars[m.group(1)] = 0 return vars def get_config_h_filename(): """Return the path of pyconfig.h.""" if _PYTHON_BUILD: if os.name == "nt": inc_dir = os.path.join(_sys_home or _PROJECT_BASE, "PC") else: inc_dir = _sys_home or _PROJECT_BASE else: inc_dir = get_path('platinclude') return os.path.join(inc_dir, 'pyconfig.h') def get_scheme_names(): """Return a tuple containing the schemes names.""" return tuple(sorted(_INSTALL_SCHEMES)) def get_path_names(): """Return a tuple containing the paths names.""" return _SCHEME_KEYS def get_paths(scheme=_get_default_scheme(), vars=None, expand=True): """Return a mapping containing an install scheme. ``scheme`` is the install scheme name. If not provided, it will return the default scheme for the current platform. """ if expand: return _expand_vars(scheme, vars) else: return _INSTALL_SCHEMES[scheme] def get_path(name, scheme=_get_default_scheme(), vars=None, expand=True): """Return a path corresponding to the scheme. ``scheme`` is the install scheme name. """ return get_paths(scheme, vars, expand)[name] def get_config_vars(*args): """With no arguments, return a dictionary of all configuration variables relevant for the current platform. On Unix, this means every variable defined in Python's installed Makefile; On Windows it's a much smaller set. With arguments, return a list of values that result from looking up each argument in the configuration variable dictionary. """ global _CONFIG_VARS if _CONFIG_VARS is None: _CONFIG_VARS = {} # Normalized versions of prefix and exec_prefix are handy to have; # in fact, these are the standard versions used most places in the # Distutils. _CONFIG_VARS['prefix'] = _PREFIX _CONFIG_VARS['exec_prefix'] = _EXEC_PREFIX _CONFIG_VARS['py_version'] = _PY_VERSION _CONFIG_VARS['py_version_short'] = _PY_VERSION_SHORT _CONFIG_VARS['py_version_nodot'] = _PY_VERSION_SHORT_NO_DOT _CONFIG_VARS['installed_base'] = _BASE_PREFIX _CONFIG_VARS['base'] = _PREFIX _CONFIG_VARS['installed_platbase'] = _BASE_EXEC_PREFIX _CONFIG_VARS['platbase'] = _EXEC_PREFIX _CONFIG_VARS['projectbase'] = _PROJECT_BASE try: _CONFIG_VARS['abiflags'] = sys.abiflags except AttributeError: # sys.abiflags may not be defined on all platforms. _CONFIG_VARS['abiflags'] = '' if os.name == 'nt': _init_non_posix(_CONFIG_VARS) if os.name == 'posix': _init_posix(_CONFIG_VARS) # For backward compatibility, see issue19555 SO = _CONFIG_VARS.get('EXT_SUFFIX') if SO is not None: _CONFIG_VARS['SO'] = SO # Setting 'userbase' is done below the call to the # init function to enable using 'get_config_var' in # the init-function. _CONFIG_VARS['userbase'] = _getuserbase() multiarch = get_config_var('MULTIARCH') if multiarch: _CONFIG_VARS['multiarchsubdir'] = '/' + multiarch else: _CONFIG_VARS['multiarchsubdir'] = '' # Always convert srcdir to an absolute path srcdir = _CONFIG_VARS.get('srcdir', _PROJECT_BASE) if os.name == 'posix': if _PYTHON_BUILD: # If srcdir is a relative path (typically '.' or '..') # then it should be interpreted relative to the directory # containing Makefile. base = os.path.dirname(get_makefile_filename()) srcdir = os.path.join(base, srcdir) else: # srcdir is not meaningful since the installation is # spread about the filesystem. We choose the # directory containing the Makefile since we know it # exists. srcdir = os.path.dirname(get_makefile_filename()) _CONFIG_VARS['srcdir'] = _safe_realpath(srcdir) # OS X platforms require special customization to handle # multi-architecture, multi-os-version installers if sys.platform == 'darwin': import _osx_support _osx_support.customize_config_vars(_CONFIG_VARS) if args: vals = [] for name in args: vals.append(_CONFIG_VARS.get(name)) return vals else: return _CONFIG_VARS def get_config_var(name): """Return the value of a single variable using the dictionary returned by 'get_config_vars()'. Equivalent to get_config_vars().get(name) """ if name == 'SO': import warnings warnings.warn('SO is deprecated, use EXT_SUFFIX', DeprecationWarning, 2) return get_config_vars().get(name) def get_platform(): """Return a string that identifies the current platform. This is used mainly to distinguish platform-specific build directories and platform-specific built distributions. Typically includes the OS name and version and the architecture (as supplied by 'os.uname()'), although the exact information included depends on the OS; on Linux, the kernel version isn't particularly important. Examples of returned values: linux-i586 linux-alpha (?) solaris-2.6-sun4u Windows will return one of: win-amd64 (64bit Windows on AMD64 (aka x86_64, Intel64, EM64T, etc) win32 (all others - specifically, sys.platform is returned) For other non-POSIX platforms, currently just returns 'sys.platform'. """ if os.name == 'nt': if 'amd64' in sys.version.lower(): return 'win-amd64' if '(arm)' in sys.version.lower(): return 'win-arm32' if '(arm64)' in sys.version.lower(): return 'win-arm64' return sys.platform if os.name != "posix" or not hasattr(os, 'uname'): # XXX what about the architecture? NT is Intel or Alpha return sys.platform # Set for cross builds explicitly if "_PYTHON_HOST_PLATFORM" in os.environ: return os.environ["_PYTHON_HOST_PLATFORM"] # Try to distinguish various flavours of Unix osname, host, release, version, machine = os.uname() # Convert the OS name to lowercase, remove '/' characters, and translate # spaces (for "Power Macintosh") osname = osname.lower().replace('/', '') machine = machine.replace(' ', '_') machine = machine.replace('/', '-') if osname[:5] == "linux": # At least on Linux/Intel, 'machine' is the processor -- # i386, etc. # XXX what about Alpha, SPARC, etc? return "%s-%s" % (osname, machine) elif osname[:5] == "sunos": if release[0] >= "5": # SunOS 5 == Solaris 2 osname = "solaris" release = "%d.%s" % (int(release[0]) - 3, release[2:]) # We can't use "platform.architecture()[0]" because a # bootstrap problem. We use a dict to get an error # if some suspicious happens. bitness = {2147483647:"32bit", 9223372036854775807:"64bit"} machine += ".%s" % bitness[sys.maxsize] # fall through to standard osname-release-machine representation elif osname[:3] == "aix": return "%s-%s.%s" % (osname, version, release) elif osname[:6] == "cygwin": osname = "cygwin" import re rel_re = re.compile(r'[\d.]+') m = rel_re.match(release) if m: release = m.group() elif osname[:6] == "darwin": import _osx_support osname, release, machine = _osx_support.get_platform_osx( get_config_vars(), osname, release, machine) return "%s-%s-%s" % (osname, release, machine) def get_python_version(): return _PY_VERSION_SHORT def _print_dict(title, data): for index, (key, value) in enumerate(sorted(data.items())): if index == 0: print('%s: ' % (title)) print('\t%s = "%s"' % (key, value)) def _main(): """Display all information sysconfig detains.""" if '--generate-posix-vars' in sys.argv: _generate_posix_vars() return print('Platform: "%s"' % get_platform()) print('Python version: "%s"' % get_python_version()) print('Current installation scheme: "%s"' % _get_default_scheme()) print() _print_dict('Paths', get_paths()) print() _print_dict('Variables', get_config_vars()) if __name__ == '__main__': _main()