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sysconfig.py
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"""Provide access to Python's configuration information. """ import sys import os from os.path import pardir, realpath _INSTALL_SCHEMES = { 'posix_prefix': { 'stdlib': '{base}/lib64/python{py_version_short}', 'platstdlib': '{platbase}/lib64/python{py_version_short}', 'purelib': '{base}/lib/python{py_version_short}/site-packages', 'platlib': '{platbase}/lib64/python{py_version_short}/site-packages', 'include': '{base}/include/python{py_version_short}', 'platinclude': '{platbase}/include/python{py_version_short}', 'scripts': '{base}/bin', 'data': '{base}', }, 'posix_home': { 'stdlib': '{base}/lib64/python', 'platstdlib': '{base}/lib64/python', 'purelib': '{base}/lib/python', 'platlib': '{base}/lib64/python', 'include': '{base}/include/python', 'platinclude': '{base}/include/python', 'scripts': '{base}/bin', 'data' : '{base}', }, 'nt': { 'stdlib': '{base}/Lib', 'platstdlib': '{base}/Lib', 'purelib': '{base}/Lib/site-packages', 'platlib': '{base}/Lib/site-packages', 'include': '{base}/Include', 'platinclude': '{base}/Include', 'scripts': '{base}/Scripts', 'data' : '{base}', }, 'os2': { 'stdlib': '{base}/Lib', 'platstdlib': '{base}/Lib', 'purelib': '{base}/Lib/site-packages', 'platlib': '{base}/Lib/site-packages', 'include': '{base}/Include', 'platinclude': '{base}/Include', 'scripts': '{base}/Scripts', 'data' : '{base}', }, 'os2_home': { '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}', }, '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}/Scripts', 'data' : '{userbase}', }, 'posix_user': { 'stdlib': '{userbase}/lib64/python{py_version_short}', 'platstdlib': '{userbase}/lib64/python{py_version_short}', 'purelib': '{userbase}/lib/python{py_version_short}/site-packages', 'platlib': '{userbase}/lib64/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') _PY_VERSION = sys.version.split()[0] _PY_VERSION_SHORT = sys.version[:3] _PY_VERSION_SHORT_NO_DOT = _PY_VERSION[0] + _PY_VERSION[2] _PREFIX = os.path.normpath(sys.prefix) _EXEC_PREFIX = os.path.normpath(sys.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 "pcbuild" in _PROJECT_BASE[-8:].lower(): _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir)) # PC/VS7.1 if os.name == "nt" and "\\pc\\v" in _PROJECT_BASE[-10:].lower(): _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir)) # PC/VS9.0/amd64 if (os.name == "nt" and os.path.basename(os.path.dirname(os.path.dirname(_PROJECT_BASE))).lower() == "pc" and os.path.basename(os.path.dirname(_PROJECT_BASE)).lower() == "vs9.0"): _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir, pardir)) # PC/AMD64 if os.name == "nt" and "\\pcbuild\\amd64" in _PROJECT_BASE[-14:].lower(): _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir)) # set for cross builds if "_PYTHON_PROJECT_BASE" in os.environ: # the build directory for posix builds _PROJECT_BASE = os.path.normpath(os.path.abspath(".")) def is_python_build(): for fn in ("Setup.dist", "Setup.local"): if os.path.isfile(os.path.join(_PROJECT_BASE, "Modules", fn)): return True return False _PYTHON_BUILD = is_python_build() if _PYTHON_BUILD: for scheme in ('posix_prefix', 'posix_home'): _INSTALL_SCHEMES[scheme]['include'] = '{projectbase}/Include' _INSTALL_SCHEMES[scheme]['platinclude'] = '{srcdir}' def _subst_vars(s, local_vars): try: return s.format(**local_vars) except KeyError: try: return s.format(**os.environ) except KeyError, var: raise AttributeError('{%s}' % var) 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 def _getuserbase(): env_base = os.environ.get("PYTHONUSERBASE", None) def joinuser(*args): return os.path.expanduser(os.path.join(*args)) # what about 'os2emx', 'riscos' ? if os.name == "nt": base = os.environ.get("APPDATA") or "~" return env_base if env_base else joinuser(base, "Python") if sys.platform == "darwin": framework = get_config_var("PYTHONFRAMEWORK") if framework: return env_base if env_base else \ joinuser("~", "Library", framework, "%d.%d" % (sys.version_info[:2])) return env_base if env_base else 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. """ import re # Regexes needed for parsing Makefile (and similar syntaxes, # like old-style Setup files). _variable_rx = re.compile("([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) 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 "$" in tmpv: notdone[n] = v else: try: v = int(v) except ValueError: # insert literal `$' done[n] = v.replace('$$', '$') else: done[n] = v # do variable interpolation here while notdone: for name in notdone.keys(): value = notdone[name] m = _findvar1_rx.search(value) or _findvar2_rx.search(value) if m: n = m.group(1) found = True if n in done: item = str(done[n]) elif n in notdone: # get it on a subsequent round found = False elif n in os.environ: # do it like make: fall back to environment item = os.environ[n] else: done[n] = item = "" if found: after = value[m.end():] value = value[:m.start()] + item + after if "$" in after: notdone[name] = value else: try: value = int(value) except ValueError: done[name] = value.strip() else: done[name] = value del notdone[name] else: # bogus variable reference; just drop it since we can't deal del notdone[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(_PROJECT_BASE, "Makefile") return os.path.join(get_path('platstdlib'), "config", "Makefile") # Issue #22199: retain undocumented private name for compatibility _get_makefile_filename = get_makefile_filename 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 IOError, e: msg = "invalid Python installation: unable to open %s" % makefile if hasattr(e, "strerror"): msg = msg + " (%s)" % e.strerror raise IOError(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 IOError, e: msg = "invalid Python installation: unable to open %s" % config_h if hasattr(e, "strerror"): msg = msg + " (%s)" % e.strerror raise IOError(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['LDSHARED'] = vars['BLDSHARED'] # 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 = '_sysconfigdata' if 'darwin' in sys.platform: import imp module = imp.new_module(name) module.build_time_vars = vars sys.modules[name] = module pybuilddir = 'build/lib.%s-%s' % (get_platform(), sys.version[:3]) if hasattr(sys, "gettotalrefcount"): pybuilddir += '-pydebug' try: os.makedirs(pybuilddir) except OSError: pass destfile = os.path.join(pybuilddir, name + '.py') with open(destfile, 'wb') 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') 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() from _sysconfigdata import build_time_vars vars.update(build_time_vars) def _init_non_posix(vars): """Initialize the module as appropriate for NT""" # set basic install directories vars['LIBDEST'] = get_path('stdlib') vars['BINLIBDEST'] = get_path('platstdlib') vars['INCLUDEPY'] = get_path('include') vars['SO'] = '.pyd' 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. """ import re if vars is None: vars = {} 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: 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(): """Returns the path of pyconfig.h.""" if _PYTHON_BUILD: if os.name == "nt": inc_dir = os.path.join(_PROJECT_BASE, "PC") else: inc_dir = _PROJECT_BASE else: inc_dir = get_path('platinclude') return os.path.join(inc_dir, 'pyconfig-64.h') def get_scheme_names(): """Returns a tuple containing the schemes names.""" schemes = _INSTALL_SCHEMES.keys() schemes.sort() return tuple(schemes) def get_path_names(): """Returns a tuple containing the paths names.""" return _SCHEME_KEYS def get_paths(scheme=_get_default_scheme(), vars=None, expand=True): """Returns 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): """Returns 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 and Mac OS 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. """ import re 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[0] + _PY_VERSION[2] _CONFIG_VARS['base'] = _PREFIX _CONFIG_VARS['platbase'] = _EXEC_PREFIX _CONFIG_VARS['projectbase'] = _PROJECT_BASE if os.name in ('nt', 'os2'): _init_non_posix(_CONFIG_VARS) if os.name == 'posix': _init_posix(_CONFIG_VARS) # 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() if 'srcdir' not in _CONFIG_VARS: _CONFIG_VARS['srcdir'] = _PROJECT_BASE # Convert srcdir into an absolute path if it appears necessary. # Normally it is relative to the build directory. However, during # testing, for example, we might be running a non-installed python # from a different directory. if _PYTHON_BUILD and os.name == "posix": base = _PROJECT_BASE try: cwd = os.getcwd() except OSError: cwd = None if (not os.path.isabs(_CONFIG_VARS['srcdir']) and base != cwd): # srcdir is relative and we are not in the same directory # as the executable. Assume executable is in the build # directory and make srcdir absolute. srcdir = os.path.join(base, _CONFIG_VARS['srcdir']) _CONFIG_VARS['srcdir'] = os.path.normpath(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) """ 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; eg. for IRIX the architecture isn't particularly important (IRIX only runs on SGI hardware), but for Linux the kernel version isn't particularly important. Examples of returned values: linux-i586 linux-alpha (?) solaris-2.6-sun4u irix-5.3 irix64-6.2 Windows will return one of: win-amd64 (64bit Windows on AMD64 (aka x86_64, Intel64, EM64T, etc) win-ia64 (64bit Windows on Itanium) win32 (all others - specifically, sys.platform is returned) For other non-POSIX platforms, currently just returns 'sys.platform'. """ import re if os.name == 'nt': # sniff sys.version for architecture. prefix = " bit (" i = sys.version.find(prefix) if i == -1: return sys.platform j = sys.version.find(")", i) look = sys.version[i+len(prefix):j].lower() if look == 'amd64': return 'win-amd64' if look == 'itanium': return 'win-ia64' return sys.platform # Set for cross builds explicitly if "_PYTHON_HOST_PLATFORM" in os.environ: return os.environ["_PYTHON_HOST_PLATFORM"] if os.name != "posix" or not hasattr(os, 'uname'): # XXX what about the architecture? NT is Intel or Alpha, # Mac OS is M68k or PPC, etc. return sys.platform # Try to distinguish various flavours of Unix osname, host, release, version, machine = os.uname() # Convert the OS name to lowercase, remove '/' characters # (to accommodate BSD/OS), 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.maxint] # fall through to standard osname-release-machine representation elif osname[:4] == "irix": # could be "irix64"! return "%s-%s" % (osname, release) elif osname[:3] == "aix": return "%s-%s.%s" % (osname, version, release) elif osname[:6] == "cygwin": osname = "cygwin" 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()