701 lines
24 KiB
Python
701 lines
24 KiB
Python
"""Access to Python's configuration information."""
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import os
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import re
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import sys
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from os.path import pardir, realpath
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__all__ = [
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'get_config_h_filename',
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'get_config_var',
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'get_config_vars',
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'get_makefile_filename',
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'get_path',
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'get_path_names',
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'get_paths',
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'get_platform',
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'get_python_version',
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'get_scheme_names',
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'parse_config_h',
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]
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_INSTALL_SCHEMES = {
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'posix_prefix': {
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'stdlib': '{installed_base}/lib/python{py_version_short}',
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'platstdlib': '{platbase}/lib/python{py_version_short}',
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'purelib': '{base}/lib/python{py_version_short}/site-packages',
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'platlib': '{platbase}/lib/python{py_version_short}/site-packages',
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'include':
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'{installed_base}/include/python{py_version_short}{abiflags}',
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'platinclude':
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'{installed_platbase}/include/python{py_version_short}{abiflags}',
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'scripts': '{base}/bin',
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'data': '{base}',
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},
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'posix_home': {
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'stdlib': '{installed_base}/lib/python',
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'platstdlib': '{base}/lib/python',
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'purelib': '{base}/lib/python',
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'platlib': '{base}/lib/python',
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'include': '{installed_base}/include/python',
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'platinclude': '{installed_base}/include/python',
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'scripts': '{base}/bin',
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'data': '{base}',
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},
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'nt': {
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'stdlib': '{installed_base}/Lib',
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'platstdlib': '{base}/Lib',
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'purelib': '{base}/Lib/site-packages',
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'platlib': '{base}/Lib/site-packages',
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'include': '{installed_base}/Include',
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'platinclude': '{installed_base}/Include',
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'scripts': '{base}/Scripts',
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'data': '{base}',
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},
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'nt_user': {
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'stdlib': '{userbase}/Python{py_version_nodot}',
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'platstdlib': '{userbase}/Python{py_version_nodot}',
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'purelib': '{userbase}/Python{py_version_nodot}/site-packages',
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'platlib': '{userbase}/Python{py_version_nodot}/site-packages',
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'include': '{userbase}/Python{py_version_nodot}/Include',
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'scripts': '{userbase}/Scripts',
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'data': '{userbase}',
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},
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'posix_user': {
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'stdlib': '{userbase}/lib/python{py_version_short}',
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'platstdlib': '{userbase}/lib/python{py_version_short}',
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'purelib': '{userbase}/lib/python{py_version_short}/site-packages',
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'platlib': '{userbase}/lib/python{py_version_short}/site-packages',
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'include': '{userbase}/include/python{py_version_short}',
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'scripts': '{userbase}/bin',
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'data': '{userbase}',
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},
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'osx_framework_user': {
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'stdlib': '{userbase}/lib/python',
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'platstdlib': '{userbase}/lib/python',
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'purelib': '{userbase}/lib/python/site-packages',
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'platlib': '{userbase}/lib/python/site-packages',
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'include': '{userbase}/include',
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'scripts': '{userbase}/bin',
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'data': '{userbase}',
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},
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}
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_SCHEME_KEYS = ('stdlib', 'platstdlib', 'purelib', 'platlib', 'include',
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'scripts', 'data')
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# FIXME don't rely on sys.version here, its format is an implementation detail
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# of CPython, use sys.version_info or sys.hexversion
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_PY_VERSION = sys.version.split()[0]
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_PY_VERSION_SHORT = sys.version[:3]
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_PY_VERSION_SHORT_NO_DOT = _PY_VERSION[0] + _PY_VERSION[2]
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_PREFIX = os.path.normpath(sys.prefix)
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_BASE_PREFIX = os.path.normpath(sys.base_prefix)
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_EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
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_BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)
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_CONFIG_VARS = None
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_USER_BASE = None
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def _safe_realpath(path):
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try:
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return realpath(path)
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except OSError:
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return path
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if sys.executable:
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_PROJECT_BASE = os.path.dirname(_safe_realpath(sys.executable))
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else:
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# sys.executable can be empty if argv[0] has been changed and Python is
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# unable to retrieve the real program name
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_PROJECT_BASE = _safe_realpath(os.getcwd())
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if os.name == "nt" and "pcbuild" in _PROJECT_BASE[-8:].lower():
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_PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir))
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# PC/VS7.1
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if os.name == "nt" and "\\pc\\v" in _PROJECT_BASE[-10:].lower():
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_PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
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# PC/AMD64
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if os.name == "nt" and "\\pcbuild\\amd64" in _PROJECT_BASE[-14:].lower():
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_PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
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# set for cross builds
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if "_PYTHON_PROJECT_BASE" in os.environ:
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_PROJECT_BASE = _safe_realpath(os.environ["_PYTHON_PROJECT_BASE"])
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def _is_python_source_dir(d):
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for fn in ("Setup.dist", "Setup.local"):
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if os.path.isfile(os.path.join(d, "Modules", fn)):
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return True
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return False
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_sys_home = getattr(sys, '_home', None)
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if _sys_home and os.name == 'nt' and \
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_sys_home.lower().endswith(('pcbuild', 'pcbuild\\amd64')):
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_sys_home = os.path.dirname(_sys_home)
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if _sys_home.endswith('pcbuild'): # must be amd64
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_sys_home = os.path.dirname(_sys_home)
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def is_python_build(check_home=False):
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if check_home and _sys_home:
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return _is_python_source_dir(_sys_home)
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return _is_python_source_dir(_PROJECT_BASE)
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_PYTHON_BUILD = is_python_build(True)
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if _PYTHON_BUILD:
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for scheme in ('posix_prefix', 'posix_home'):
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_INSTALL_SCHEMES[scheme]['include'] = '{srcdir}/Include'
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_INSTALL_SCHEMES[scheme]['platinclude'] = '{projectbase}/.'
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def _subst_vars(s, local_vars):
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try:
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return s.format(**local_vars)
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except KeyError:
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try:
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return s.format(**os.environ)
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except KeyError as var:
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raise AttributeError('{%s}' % var)
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def _extend_dict(target_dict, other_dict):
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target_keys = target_dict.keys()
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for key, value in other_dict.items():
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if key in target_keys:
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continue
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target_dict[key] = value
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def _expand_vars(scheme, vars):
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res = {}
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if vars is None:
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vars = {}
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_extend_dict(vars, get_config_vars())
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for key, value in _INSTALL_SCHEMES[scheme].items():
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if os.name in ('posix', 'nt'):
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value = os.path.expanduser(value)
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res[key] = os.path.normpath(_subst_vars(value, vars))
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return res
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def _get_default_scheme():
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if os.name == 'posix':
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# the default scheme for posix is posix_prefix
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return 'posix_prefix'
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return os.name
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def _getuserbase():
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env_base = os.environ.get("PYTHONUSERBASE", None)
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def joinuser(*args):
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return os.path.expanduser(os.path.join(*args))
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if os.name == "nt":
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base = os.environ.get("APPDATA") or "~"
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if env_base:
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return env_base
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else:
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return joinuser(base, "Python")
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if sys.platform == "darwin":
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framework = get_config_var("PYTHONFRAMEWORK")
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if framework:
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if env_base:
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return env_base
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else:
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return joinuser("~", "Library", framework, "%d.%d" %
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sys.version_info[:2])
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if env_base:
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return env_base
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else:
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return joinuser("~", ".local")
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def _parse_makefile(filename, vars=None):
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"""Parse a Makefile-style file.
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A dictionary containing name/value pairs is returned. If an
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optional dictionary is passed in as the second argument, it is
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used instead of a new dictionary.
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"""
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# Regexes needed for parsing Makefile (and similar syntaxes,
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# like old-style Setup files).
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_variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")
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_findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")
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_findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")
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if vars is None:
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vars = {}
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done = {}
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notdone = {}
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with open(filename, errors="surrogateescape") as f:
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lines = f.readlines()
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for line in lines:
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if line.startswith('#') or line.strip() == '':
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continue
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m = _variable_rx.match(line)
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if m:
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n, v = m.group(1, 2)
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v = v.strip()
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# `$$' is a literal `$' in make
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tmpv = v.replace('$$', '')
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if "$" in tmpv:
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notdone[n] = v
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else:
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try:
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v = int(v)
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except ValueError:
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# insert literal `$'
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done[n] = v.replace('$$', '$')
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else:
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done[n] = v
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# do variable interpolation here
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variables = list(notdone.keys())
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# Variables with a 'PY_' prefix in the makefile. These need to
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# be made available without that prefix through sysconfig.
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# Special care is needed to ensure that variable expansion works, even
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# if the expansion uses the name without a prefix.
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renamed_variables = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS')
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while len(variables) > 0:
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for name in tuple(variables):
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value = notdone[name]
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m = _findvar1_rx.search(value) or _findvar2_rx.search(value)
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if m is not None:
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n = m.group(1)
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found = True
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if n in done:
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item = str(done[n])
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elif n in notdone:
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# get it on a subsequent round
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found = False
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elif n in os.environ:
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# do it like make: fall back to environment
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item = os.environ[n]
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elif n in renamed_variables:
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if (name.startswith('PY_') and
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name[3:] in renamed_variables):
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item = ""
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elif 'PY_' + n in notdone:
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found = False
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else:
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item = str(done['PY_' + n])
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else:
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done[n] = item = ""
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if found:
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after = value[m.end():]
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value = value[:m.start()] + item + after
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if "$" in after:
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notdone[name] = value
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else:
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try:
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value = int(value)
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except ValueError:
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done[name] = value.strip()
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else:
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done[name] = value
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variables.remove(name)
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if name.startswith('PY_') \
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and name[3:] in renamed_variables:
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name = name[3:]
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if name not in done:
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done[name] = value
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else:
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# bogus variable reference (e.g. "prefix=$/opt/python");
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# just drop it since we can't deal
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done[name] = value
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variables.remove(name)
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# strip spurious spaces
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for k, v in done.items():
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if isinstance(v, str):
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done[k] = v.strip()
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# save the results in the global dictionary
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vars.update(done)
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return vars
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def get_makefile_filename():
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"""Return the path of the Makefile."""
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if _PYTHON_BUILD:
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return os.path.join(_sys_home or _PROJECT_BASE, "Makefile")
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if hasattr(sys, 'abiflags'):
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config_dir_name = 'config-%s%s' % (_PY_VERSION_SHORT, sys.abiflags)
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else:
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config_dir_name = 'config'
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return os.path.join(get_path('stdlib'), config_dir_name, 'Makefile')
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def _generate_posix_vars():
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"""Generate the Python module containing build-time variables."""
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import pprint
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vars = {}
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# load the installed Makefile:
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makefile = get_makefile_filename()
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try:
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_parse_makefile(makefile, vars)
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except OSError as e:
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msg = "invalid Python installation: unable to open %s" % makefile
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if hasattr(e, "strerror"):
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msg = msg + " (%s)" % e.strerror
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raise OSError(msg)
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# load the installed pyconfig.h:
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config_h = get_config_h_filename()
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try:
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with open(config_h) as f:
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parse_config_h(f, vars)
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except OSError as e:
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msg = "invalid Python installation: unable to open %s" % config_h
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if hasattr(e, "strerror"):
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msg = msg + " (%s)" % e.strerror
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raise OSError(msg)
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# On AIX, there are wrong paths to the linker scripts in the Makefile
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# -- these paths are relative to the Python source, but when installed
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# the scripts are in another directory.
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if _PYTHON_BUILD:
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vars['LDSHARED'] = vars['BLDSHARED']
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# There's a chicken-and-egg situation on OS X with regards to the
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# _sysconfigdata module after the changes introduced by #15298:
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# get_config_vars() is called by get_platform() as part of the
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# `make pybuilddir.txt` target -- which is a precursor to the
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# _sysconfigdata.py module being constructed. Unfortunately,
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# get_config_vars() eventually calls _init_posix(), which attempts
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# to import _sysconfigdata, which we won't have built yet. In order
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# for _init_posix() to work, if we're on Darwin, just mock up the
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# _sysconfigdata module manually and populate it with the build vars.
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# This is more than sufficient for ensuring the subsequent call to
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# get_platform() succeeds.
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name = '_sysconfigdata'
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if 'darwin' in sys.platform:
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import types
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module = types.ModuleType(name)
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module.build_time_vars = vars
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sys.modules[name] = module
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pybuilddir = 'build/lib.%s-%s' % (get_platform(), sys.version[:3])
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if hasattr(sys, "gettotalrefcount"):
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pybuilddir += '-pydebug'
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os.makedirs(pybuilddir, exist_ok=True)
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destfile = os.path.join(pybuilddir, name + '.py')
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with open(destfile, 'w', encoding='utf8') as f:
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f.write('# system configuration generated and used by'
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' the sysconfig module\n')
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f.write('build_time_vars = ')
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pprint.pprint(vars, stream=f)
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# Create file used for sys.path fixup -- see Modules/getpath.c
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with open('pybuilddir.txt', 'w', encoding='ascii') as f:
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f.write(pybuilddir)
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def _init_posix(vars):
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"""Initialize the module as appropriate for POSIX systems."""
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# _sysconfigdata is generated at build time, see _generate_posix_vars()
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from _sysconfigdata import build_time_vars
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vars.update(build_time_vars)
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def _init_non_posix(vars):
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"""Initialize the module as appropriate for NT"""
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# set basic install directories
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vars['LIBDEST'] = get_path('stdlib')
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vars['BINLIBDEST'] = get_path('platstdlib')
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vars['INCLUDEPY'] = get_path('include')
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vars['EXT_SUFFIX'] = '.pyd'
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vars['EXE'] = '.exe'
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vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT
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vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))
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#
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# public APIs
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#
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def parse_config_h(fp, vars=None):
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"""Parse a config.h-style file.
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A dictionary containing name/value pairs is returned. If an
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optional dictionary is passed in as the second argument, it is
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used instead of a new dictionary.
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"""
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if vars is None:
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vars = {}
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define_rx = re.compile("#define ([A-Z][A-Za-z0-9_]+) (.*)\n")
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undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-z0-9_]+) [*]/\n")
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while True:
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line = fp.readline()
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if not line:
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break
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m = define_rx.match(line)
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if m:
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n, v = m.group(1, 2)
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try:
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v = int(v)
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except ValueError:
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pass
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vars[n] = v
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else:
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m = undef_rx.match(line)
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if m:
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vars[m.group(1)] = 0
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return vars
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def get_config_h_filename():
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"""Return the path of pyconfig.h."""
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if _PYTHON_BUILD:
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if os.name == "nt":
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inc_dir = os.path.join(_sys_home or _PROJECT_BASE, "PC")
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else:
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inc_dir = _sys_home or _PROJECT_BASE
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else:
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inc_dir = get_path('platinclude')
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return os.path.join(inc_dir, 'pyconfig.h')
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def get_scheme_names():
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"""Return a tuple containing the schemes names."""
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return tuple(sorted(_INSTALL_SCHEMES))
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def get_path_names():
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"""Return a tuple containing the paths names."""
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return _SCHEME_KEYS
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def get_paths(scheme=_get_default_scheme(), vars=None, expand=True):
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"""Return a mapping containing an install scheme.
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``scheme`` is the install scheme name. If not provided, it will
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return the default scheme for the current platform.
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"""
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if expand:
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return _expand_vars(scheme, vars)
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else:
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return _INSTALL_SCHEMES[scheme]
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def get_path(name, scheme=_get_default_scheme(), vars=None, expand=True):
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"""Return a path corresponding to the scheme.
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``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[0] + _PY_VERSION[2]
|
|
_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)
|
|
# 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()
|
|
|
|
# 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)
|
|
"""
|
|
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'.
|
|
"""
|
|
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
|
|
|
|
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
|
|
# (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.maxsize]
|
|
# 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()
|