514 lines
18 KiB
Python
514 lines
18 KiB
Python
"""distutils.util
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Miscellaneous utility functions -- anything that doesn't fit into
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one of the other *util.py modules.
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"""
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import importlib.util
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import os
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import re
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import string
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import subprocess
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import sys
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import sysconfig
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import functools
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from distutils.errors import DistutilsPlatformError, DistutilsByteCompileError
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from distutils.dep_util import newer
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from distutils.spawn import spawn
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from distutils import log
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def get_host_platform():
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"""
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Return a string that identifies the current platform. Use this
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function to distinguish platform-specific build directories and
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platform-specific built distributions.
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"""
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# This function initially exposed platforms as defined in Python 3.9
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# even with older Python versions when distutils was split out.
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# Now it delegates to stdlib sysconfig, but maintains compatibility.
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if sys.version_info < (3, 8):
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if os.name == 'nt':
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if '(arm)' in sys.version.lower():
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return 'win-arm32'
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if '(arm64)' in sys.version.lower():
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return 'win-arm64'
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if sys.version_info < (3, 9):
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if os.name == "posix" and hasattr(os, 'uname'):
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osname, host, release, version, machine = os.uname()
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if osname[:3] == "aix":
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from .py38compat import aix_platform
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return aix_platform(osname, version, release)
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return sysconfig.get_platform()
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def get_platform():
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if os.name == 'nt':
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TARGET_TO_PLAT = {
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'x86': 'win32',
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'x64': 'win-amd64',
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'arm': 'win-arm32',
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'arm64': 'win-arm64',
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}
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target = os.environ.get('VSCMD_ARG_TGT_ARCH')
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return TARGET_TO_PLAT.get(target) or get_host_platform()
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return get_host_platform()
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if sys.platform == 'darwin':
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_syscfg_macosx_ver = None # cache the version pulled from sysconfig
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MACOSX_VERSION_VAR = 'MACOSX_DEPLOYMENT_TARGET'
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def _clear_cached_macosx_ver():
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"""For testing only. Do not call."""
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global _syscfg_macosx_ver
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_syscfg_macosx_ver = None
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def get_macosx_target_ver_from_syscfg():
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"""Get the version of macOS latched in the Python interpreter configuration.
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Returns the version as a string or None if can't obtain one. Cached."""
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global _syscfg_macosx_ver
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if _syscfg_macosx_ver is None:
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from distutils import sysconfig
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ver = sysconfig.get_config_var(MACOSX_VERSION_VAR) or ''
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if ver:
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_syscfg_macosx_ver = ver
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return _syscfg_macosx_ver
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def get_macosx_target_ver():
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"""Return the version of macOS for which we are building.
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The target version defaults to the version in sysconfig latched at time
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the Python interpreter was built, unless overridden by an environment
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variable. If neither source has a value, then None is returned"""
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syscfg_ver = get_macosx_target_ver_from_syscfg()
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env_ver = os.environ.get(MACOSX_VERSION_VAR)
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if env_ver:
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# Validate overridden version against sysconfig version, if have both.
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# Ensure that the deployment target of the build process is not less
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# than 10.3 if the interpreter was built for 10.3 or later. This
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# ensures extension modules are built with correct compatibility
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# values, specifically LDSHARED which can use
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# '-undefined dynamic_lookup' which only works on >= 10.3.
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if (
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syscfg_ver
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and split_version(syscfg_ver) >= [10, 3]
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and split_version(env_ver) < [10, 3]
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):
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my_msg = (
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'$' + MACOSX_VERSION_VAR + ' mismatch: '
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'now "%s" but "%s" during configure; '
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'must use 10.3 or later' % (env_ver, syscfg_ver)
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)
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raise DistutilsPlatformError(my_msg)
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return env_ver
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return syscfg_ver
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def split_version(s):
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"""Convert a dot-separated string into a list of numbers for comparisons"""
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return [int(n) for n in s.split('.')]
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def convert_path(pathname):
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"""Return 'pathname' as a name that will work on the native filesystem,
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i.e. split it on '/' and put it back together again using the current
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directory separator. Needed because filenames in the setup script are
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always supplied in Unix style, and have to be converted to the local
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convention before we can actually use them in the filesystem. Raises
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ValueError on non-Unix-ish systems if 'pathname' either starts or
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ends with a slash.
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"""
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if os.sep == '/':
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return pathname
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if not pathname:
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return pathname
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if pathname[0] == '/':
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raise ValueError("path '%s' cannot be absolute" % pathname)
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if pathname[-1] == '/':
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raise ValueError("path '%s' cannot end with '/'" % pathname)
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paths = pathname.split('/')
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while '.' in paths:
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paths.remove('.')
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if not paths:
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return os.curdir
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return os.path.join(*paths)
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# convert_path ()
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def change_root(new_root, pathname):
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"""Return 'pathname' with 'new_root' prepended. If 'pathname' is
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relative, this is equivalent to "os.path.join(new_root,pathname)".
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Otherwise, it requires making 'pathname' relative and then joining the
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two, which is tricky on DOS/Windows and Mac OS.
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"""
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if os.name == 'posix':
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if not os.path.isabs(pathname):
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return os.path.join(new_root, pathname)
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else:
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return os.path.join(new_root, pathname[1:])
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elif os.name == 'nt':
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(drive, path) = os.path.splitdrive(pathname)
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if path[0] == '\\':
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path = path[1:]
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return os.path.join(new_root, path)
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raise DistutilsPlatformError(f"nothing known about platform '{os.name}'")
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@functools.lru_cache()
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def check_environ():
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"""Ensure that 'os.environ' has all the environment variables we
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guarantee that users can use in config files, command-line options,
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etc. Currently this includes:
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HOME - user's home directory (Unix only)
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PLAT - description of the current platform, including hardware
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and OS (see 'get_platform()')
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"""
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if os.name == 'posix' and 'HOME' not in os.environ:
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try:
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import pwd
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os.environ['HOME'] = pwd.getpwuid(os.getuid())[5]
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except (ImportError, KeyError):
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# bpo-10496: if the current user identifier doesn't exist in the
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# password database, do nothing
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pass
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if 'PLAT' not in os.environ:
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os.environ['PLAT'] = get_platform()
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def subst_vars(s, local_vars):
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"""
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Perform variable substitution on 'string'.
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Variables are indicated by format-style braces ("{var}").
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Variable is substituted by the value found in the 'local_vars'
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dictionary or in 'os.environ' if it's not in 'local_vars'.
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'os.environ' is first checked/augmented to guarantee that it contains
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certain values: see 'check_environ()'. Raise ValueError for any
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variables not found in either 'local_vars' or 'os.environ'.
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"""
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check_environ()
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lookup = dict(os.environ)
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lookup.update((name, str(value)) for name, value in local_vars.items())
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try:
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return _subst_compat(s).format_map(lookup)
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except KeyError as var:
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raise ValueError(f"invalid variable {var}")
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def _subst_compat(s):
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"""
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Replace shell/Perl-style variable substitution with
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format-style. For compatibility.
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"""
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def _subst(match):
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return f'{{{match.group(1)}}}'
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repl = re.sub(r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, s)
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if repl != s:
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import warnings
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warnings.warn(
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"shell/Perl-style substitions are deprecated",
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DeprecationWarning,
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)
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return repl
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def grok_environment_error(exc, prefix="error: "):
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# Function kept for backward compatibility.
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# Used to try clever things with EnvironmentErrors,
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# but nowadays str(exception) produces good messages.
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return prefix + str(exc)
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# Needed by 'split_quoted()'
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_wordchars_re = _squote_re = _dquote_re = None
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def _init_regex():
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global _wordchars_re, _squote_re, _dquote_re
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_wordchars_re = re.compile(r'[^\\\'\"%s ]*' % string.whitespace)
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_squote_re = re.compile(r"'(?:[^'\\]|\\.)*'")
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_dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"')
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def split_quoted(s):
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"""Split a string up according to Unix shell-like rules for quotes and
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backslashes. In short: words are delimited by spaces, as long as those
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spaces are not escaped by a backslash, or inside a quoted string.
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Single and double quotes are equivalent, and the quote characters can
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be backslash-escaped. The backslash is stripped from any two-character
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escape sequence, leaving only the escaped character. The quote
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characters are stripped from any quoted string. Returns a list of
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words.
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"""
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# This is a nice algorithm for splitting up a single string, since it
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# doesn't require character-by-character examination. It was a little
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# bit of a brain-bender to get it working right, though...
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if _wordchars_re is None:
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_init_regex()
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s = s.strip()
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words = []
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pos = 0
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while s:
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m = _wordchars_re.match(s, pos)
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end = m.end()
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if end == len(s):
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words.append(s[:end])
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break
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if s[end] in string.whitespace:
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# unescaped, unquoted whitespace: now
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# we definitely have a word delimiter
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words.append(s[:end])
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s = s[end:].lstrip()
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pos = 0
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elif s[end] == '\\':
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# preserve whatever is being escaped;
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# will become part of the current word
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s = s[:end] + s[end + 1 :]
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pos = end + 1
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else:
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if s[end] == "'": # slurp singly-quoted string
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m = _squote_re.match(s, end)
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elif s[end] == '"': # slurp doubly-quoted string
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m = _dquote_re.match(s, end)
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else:
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raise RuntimeError("this can't happen (bad char '%c')" % s[end])
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if m is None:
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raise ValueError("bad string (mismatched %s quotes?)" % s[end])
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(beg, end) = m.span()
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s = s[:beg] + s[beg + 1 : end - 1] + s[end:]
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pos = m.end() - 2
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if pos >= len(s):
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words.append(s)
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break
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return words
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# split_quoted ()
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def execute(func, args, msg=None, verbose=0, dry_run=0):
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"""Perform some action that affects the outside world (eg. by
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writing to the filesystem). Such actions are special because they
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are disabled by the 'dry_run' flag. This method takes care of all
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that bureaucracy for you; all you have to do is supply the
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function to call and an argument tuple for it (to embody the
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"external action" being performed), and an optional message to
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print.
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"""
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if msg is None:
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msg = "{}{!r}".format(func.__name__, args)
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if msg[-2:] == ',)': # correct for singleton tuple
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msg = msg[0:-2] + ')'
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log.info(msg)
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if not dry_run:
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func(*args)
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def strtobool(val):
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"""Convert a string representation of truth to true (1) or false (0).
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True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
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are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if
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'val' is anything else.
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"""
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val = val.lower()
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if val in ('y', 'yes', 't', 'true', 'on', '1'):
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return 1
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elif val in ('n', 'no', 'f', 'false', 'off', '0'):
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return 0
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else:
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raise ValueError("invalid truth value {!r}".format(val))
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def byte_compile( # noqa: C901
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py_files,
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optimize=0,
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force=0,
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prefix=None,
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base_dir=None,
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verbose=1,
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dry_run=0,
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direct=None,
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):
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"""Byte-compile a collection of Python source files to .pyc
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files in a __pycache__ subdirectory. 'py_files' is a list
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of files to compile; any files that don't end in ".py" are silently
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skipped. 'optimize' must be one of the following:
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0 - don't optimize
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1 - normal optimization (like "python -O")
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2 - extra optimization (like "python -OO")
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If 'force' is true, all files are recompiled regardless of
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timestamps.
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The source filename encoded in each bytecode file defaults to the
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filenames listed in 'py_files'; you can modify these with 'prefix' and
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'basedir'. 'prefix' is a string that will be stripped off of each
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source filename, and 'base_dir' is a directory name that will be
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prepended (after 'prefix' is stripped). You can supply either or both
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(or neither) of 'prefix' and 'base_dir', as you wish.
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If 'dry_run' is true, doesn't actually do anything that would
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affect the filesystem.
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Byte-compilation is either done directly in this interpreter process
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with the standard py_compile module, or indirectly by writing a
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temporary script and executing it. Normally, you should let
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'byte_compile()' figure out to use direct compilation or not (see
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the source for details). The 'direct' flag is used by the script
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generated in indirect mode; unless you know what you're doing, leave
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it set to None.
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"""
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# nothing is done if sys.dont_write_bytecode is True
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if sys.dont_write_bytecode:
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raise DistutilsByteCompileError('byte-compiling is disabled.')
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# First, if the caller didn't force us into direct or indirect mode,
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# figure out which mode we should be in. We take a conservative
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# approach: choose direct mode *only* if the current interpreter is
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# in debug mode and optimize is 0. If we're not in debug mode (-O
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# or -OO), we don't know which level of optimization this
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# interpreter is running with, so we can't do direct
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# byte-compilation and be certain that it's the right thing. Thus,
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# always compile indirectly if the current interpreter is in either
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# optimize mode, or if either optimization level was requested by
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# the caller.
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if direct is None:
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direct = __debug__ and optimize == 0
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# "Indirect" byte-compilation: write a temporary script and then
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# run it with the appropriate flags.
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if not direct:
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try:
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from tempfile import mkstemp
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(script_fd, script_name) = mkstemp(".py")
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except ImportError:
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from tempfile import mktemp
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(script_fd, script_name) = None, mktemp(".py")
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log.info("writing byte-compilation script '%s'", script_name)
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if not dry_run:
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if script_fd is not None:
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script = os.fdopen(script_fd, "w")
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else:
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script = open(script_name, "w")
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with script:
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script.write(
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"""\
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from distutils.util import byte_compile
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files = [
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"""
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)
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# XXX would be nice to write absolute filenames, just for
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# safety's sake (script should be more robust in the face of
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# chdir'ing before running it). But this requires abspath'ing
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# 'prefix' as well, and that breaks the hack in build_lib's
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# 'byte_compile()' method that carefully tacks on a trailing
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# slash (os.sep really) to make sure the prefix here is "just
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# right". This whole prefix business is rather delicate -- the
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# problem is that it's really a directory, but I'm treating it
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# as a dumb string, so trailing slashes and so forth matter.
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script.write(",\n".join(map(repr, py_files)) + "]\n")
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script.write(
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"""
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byte_compile(files, optimize=%r, force=%r,
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prefix=%r, base_dir=%r,
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verbose=%r, dry_run=0,
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direct=1)
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"""
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% (optimize, force, prefix, base_dir, verbose)
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)
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cmd = [sys.executable]
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cmd.extend(subprocess._optim_args_from_interpreter_flags())
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cmd.append(script_name)
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spawn(cmd, dry_run=dry_run)
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execute(os.remove, (script_name,), "removing %s" % script_name, dry_run=dry_run)
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# "Direct" byte-compilation: use the py_compile module to compile
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# right here, right now. Note that the script generated in indirect
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# mode simply calls 'byte_compile()' in direct mode, a weird sort of
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# cross-process recursion. Hey, it works!
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else:
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from py_compile import compile
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for file in py_files:
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if file[-3:] != ".py":
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# This lets us be lazy and not filter filenames in
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# the "install_lib" command.
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continue
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# Terminology from the py_compile module:
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# cfile - byte-compiled file
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# dfile - purported source filename (same as 'file' by default)
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if optimize >= 0:
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opt = '' if optimize == 0 else optimize
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cfile = importlib.util.cache_from_source(file, optimization=opt)
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else:
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cfile = importlib.util.cache_from_source(file)
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dfile = file
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if prefix:
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if file[: len(prefix)] != prefix:
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raise ValueError(
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"invalid prefix: filename %r doesn't start with %r"
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% (file, prefix)
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)
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dfile = dfile[len(prefix) :]
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if base_dir:
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dfile = os.path.join(base_dir, dfile)
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cfile_base = os.path.basename(cfile)
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if direct:
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if force or newer(file, cfile):
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log.info("byte-compiling %s to %s", file, cfile_base)
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if not dry_run:
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compile(file, cfile, dfile)
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else:
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log.debug("skipping byte-compilation of %s to %s", file, cfile_base)
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def rfc822_escape(header):
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"""Return a version of the string escaped for inclusion in an
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RFC-822 header, by ensuring there are 8 spaces space after each newline.
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"""
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lines = header.split('\n')
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sep = '\n' + 8 * ' '
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return sep.join(lines)
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