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Editing: util.py
"""distutils.util Miscellaneous utility functions -- anything that doesn't fit into one of the other *util.py modules. """ from __future__ import annotations import functools import importlib.util import os import pathlib import re import string import subprocess import sys import sysconfig import tempfile from collections.abc import Callable, Iterable, Mapping from typing import TYPE_CHECKING, AnyStr from jaraco.functools import pass_none from ._log import log from ._modified import newer from .errors import DistutilsByteCompileError, DistutilsPlatformError from .spawn import spawn if TYPE_CHECKING: from typing_extensions import TypeVarTuple, Unpack _Ts = TypeVarTuple("_Ts") def get_host_platform() -> str: """ Return a string that identifies the current platform. Use this function to distinguish platform-specific build directories and platform-specific built distributions. """ # This function initially exposed platforms as defined in Python 3.9 # even with older Python versions when distutils was split out. # Now it delegates to stdlib sysconfig. return sysconfig.get_platform() def get_platform() -> str: if os.name == 'nt': TARGET_TO_PLAT = { 'x86': 'win32', 'x64': 'win-amd64', 'arm': 'win-arm32', 'arm64': 'win-arm64', } target = os.environ.get('VSCMD_ARG_TGT_ARCH') return TARGET_TO_PLAT.get(target) or get_host_platform() return get_host_platform() if sys.platform == 'darwin': _syscfg_macosx_ver = None # cache the version pulled from sysconfig MACOSX_VERSION_VAR = 'MACOSX_DEPLOYMENT_TARGET' def _clear_cached_macosx_ver(): """For testing only. Do not call.""" global _syscfg_macosx_ver _syscfg_macosx_ver = None def get_macosx_target_ver_from_syscfg(): """Get the version of macOS latched in the Python interpreter configuration. Returns the version as a string or None if can't obtain one. Cached.""" global _syscfg_macosx_ver if _syscfg_macosx_ver is None: from distutils import sysconfig ver = sysconfig.get_config_var(MACOSX_VERSION_VAR) or '' if ver: _syscfg_macosx_ver = ver return _syscfg_macosx_ver def get_macosx_target_ver(): """Return the version of macOS for which we are building. The target version defaults to the version in sysconfig latched at time the Python interpreter was built, unless overridden by an environment variable. If neither source has a value, then None is returned""" syscfg_ver = get_macosx_target_ver_from_syscfg() env_ver = os.environ.get(MACOSX_VERSION_VAR) if env_ver: # Validate overridden version against sysconfig version, if have both. # Ensure that the deployment target of the build process is not less # than 10.3 if the interpreter was built for 10.3 or later. This # ensures extension modules are built with correct compatibility # values, specifically LDSHARED which can use # '-undefined dynamic_lookup' which only works on >= 10.3. if ( syscfg_ver and split_version(syscfg_ver) >= [10, 3] and split_version(env_ver) < [10, 3] ): my_msg = ( '$' + MACOSX_VERSION_VAR + ' mismatch: ' f'now "{env_ver}" but "{syscfg_ver}" during configure; ' 'must use 10.3 or later' ) raise DistutilsPlatformError(my_msg) return env_ver return syscfg_ver def split_version(s: str) -> list[int]: """Convert a dot-separated string into a list of numbers for comparisons""" return [int(n) for n in s.split('.')] @pass_none def convert_path(pathname: str | os.PathLike[str]) -> str: r""" Allow for pathlib.Path inputs, coax to a native path string. If None is passed, will just pass it through as Setuptools relies on this behavior. >>> convert_path(None) is None True Removes empty paths. >>> convert_path('foo/./bar').replace('\\', '/') 'foo/bar' """ return os.fspath(pathlib.PurePath(pathname)) def change_root( new_root: AnyStr | os.PathLike[AnyStr], pathname: AnyStr | os.PathLike[AnyStr] ) -> AnyStr: """Return 'pathname' with 'new_root' prepended. If 'pathname' is relative, this is equivalent to "os.path.join(new_root,pathname)". Otherwise, it requires making 'pathname' relative and then joining the two, which is tricky on DOS/Windows and Mac OS. """ if os.name == 'posix': if not os.path.isabs(pathname): return os.path.join(new_root, pathname) else: return os.path.join(new_root, pathname[1:]) elif os.name == 'nt': (drive, path) = os.path.splitdrive(pathname) if path[0] == os.sep: path = path[1:] return os.path.join(new_root, path) raise DistutilsPlatformError(f"nothing known about platform '{os.name}'") @functools.lru_cache def check_environ() -> None: """Ensure that 'os.environ' has all the environment variables we guarantee that users can use in config files, command-line options, etc. Currently this includes: HOME - user's home directory (Unix only) PLAT - description of the current platform, including hardware and OS (see 'get_platform()') """ if os.name == 'posix' and 'HOME' not in os.environ: try: import pwd os.environ['HOME'] = pwd.getpwuid(os.getuid())[5] except (ImportError, KeyError): # bpo-10496: if the current user identifier doesn't exist in the # password database, do nothing pass if 'PLAT' not in os.environ: os.environ['PLAT'] = get_platform() def subst_vars(s, local_vars: Mapping[str, object]) -> str: """ Perform variable substitution on 'string'. Variables are indicated by format-style braces ("{var}"). Variable is substituted by the value found in the 'local_vars' dictionary or in 'os.environ' if it's not in 'local_vars'. 'os.environ' is first checked/augmented to guarantee that it contains certain values: see 'check_environ()'. Raise ValueError for any variables not found in either 'local_vars' or 'os.environ'. """ check_environ() lookup = dict(os.environ) lookup.update((name, str(value)) for name, value in local_vars.items()) try: return _subst_compat(s).format_map(lookup) except KeyError as var: raise ValueError(f"invalid variable {var}") def _subst_compat(s): """ Replace shell/Perl-style variable substitution with format-style. For compatibility. """ def _subst(match): return f'{{{match.group(1)}}}' repl = re.sub(r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, s) if repl != s: import warnings warnings.warn( "shell/Perl-style substitutions are deprecated", DeprecationWarning, ) return repl def grok_environment_error(exc: object, prefix: str = "error: ") -> str: # Function kept for backward compatibility. # Used to try clever things with EnvironmentErrors, # but nowadays str(exception) produces good messages. return prefix + str(exc) # Needed by 'split_quoted()' _wordchars_re = _squote_re = _dquote_re = None def _init_regex(): global _wordchars_re, _squote_re, _dquote_re _wordchars_re = re.compile(rf'[^\\\'\"{string.whitespace} ]*') _squote_re = re.compile(r"'(?:[^'\\]|\\.)*'") _dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"') def split_quoted(s: str) -> list[str]: """Split a string up according to Unix shell-like rules for quotes and backslashes. In short: words are delimited by spaces, as long as those spaces are not escaped by a backslash, or inside a quoted string. Single and double quotes are equivalent, and the quote characters can be backslash-escaped. The backslash is stripped from any two-character escape sequence, leaving only the escaped character. The quote characters are stripped from any quoted string. Returns a list of words. """ # This is a nice algorithm for splitting up a single string, since it # doesn't require character-by-character examination. It was a little # bit of a brain-bender to get it working right, though... if _wordchars_re is None: _init_regex() s = s.strip() words = [] pos = 0 while s: m = _wordchars_re.match(s, pos) end = m.end() if end == len(s): words.append(s[:end]) break if s[end] in string.whitespace: # unescaped, unquoted whitespace: now # we definitely have a word delimiter words.append(s[:end]) s = s[end:].lstrip() pos = 0 elif s[end] == '\\': # preserve whatever is being escaped; # will become part of the current word s = s[:end] + s[end + 1 :] pos = end + 1 else: if s[end] == "'": # slurp singly-quoted string m = _squote_re.match(s, end) elif s[end] == '"': # slurp doubly-quoted string m = _dquote_re.match(s, end) else: raise RuntimeError(f"this can't happen (bad char '{s[end]}')") if m is None: raise ValueError(f"bad string (mismatched {s[end]} quotes?)") (beg, end) = m.span() s = s[:beg] + s[beg + 1 : end - 1] + s[end:] pos = m.end() - 2 if pos >= len(s): words.append(s) break return words # split_quoted () def execute( func: Callable[[Unpack[_Ts]], object], args: tuple[Unpack[_Ts]], msg: object = None, verbose: bool = False, dry_run: bool = False, ) -> None: """ Perform some action that affects the outside world (e.g. by writing to the filesystem). Such actions are special because they are disabled by the 'dry_run' flag. This method handles that complication; simply supply the function to call and an argument tuple for it (to embody the "external action" being performed) and an optional message to emit. """ if msg is None: msg = f"{func.__name__}{args!r}" if msg[-2:] == ',)': # correct for singleton tuple msg = msg[0:-2] + ')' log.info(msg) if not dry_run: func(*args) def strtobool(val: str) -> bool: """Convert a string representation of truth to true (1) or false (0). True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if 'val' is anything else. """ val = val.lower() if val in ('y', 'yes', 't', 'true', 'on', '1'): return True elif val in ('n', 'no', 'f', 'false', 'off', '0'): return False else: raise ValueError(f"invalid truth value {val!r}") def byte_compile( # noqa: C901 py_files: Iterable[str], optimize: int = 0, force: bool = False, prefix: str | None = None, base_dir: str | None = None, verbose: bool = True, dry_run: bool = False, direct: bool | None = None, ) -> None: """Byte-compile a collection of Python source files to .pyc files in a __pycache__ subdirectory. 'py_files' is a list of files to compile; any files that don't end in ".py" are silently skipped. 'optimize' must be one of the following: 0 - don't optimize 1 - normal optimization (like "python -O") 2 - extra optimization (like "python -OO") If 'force' is true, all files are recompiled regardless of timestamps. The source filename encoded in each bytecode file defaults to the filenames listed in 'py_files'; you can modify these with 'prefix' and 'basedir'. 'prefix' is a string that will be stripped off of each source filename, and 'base_dir' is a directory name that will be prepended (after 'prefix' is stripped). You can supply either or both (or neither) of 'prefix' and 'base_dir', as you wish. If 'dry_run' is true, doesn't actually do anything that would affect the filesystem. Byte-compilation is either done directly in this interpreter process with the standard py_compile module, or indirectly by writing a temporary script and executing it. Normally, you should let 'byte_compile()' figure out to use direct compilation or not (see the source for details). The 'direct' flag is used by the script generated in indirect mode; unless you know what you're doing, leave it set to None. """ # nothing is done if sys.dont_write_bytecode is True if sys.dont_write_bytecode: raise DistutilsByteCompileError('byte-compiling is disabled.') # First, if the caller didn't force us into direct or indirect mode, # figure out which mode we should be in. We take a conservative # approach: choose direct mode *only* if the current interpreter is # in debug mode and optimize is 0. If we're not in debug mode (-O # or -OO), we don't know which level of optimization this # interpreter is running with, so we can't do direct # byte-compilation and be certain that it's the right thing. Thus, # always compile indirectly if the current interpreter is in either # optimize mode, or if either optimization level was requested by # the caller. if direct is None: direct = __debug__ and optimize == 0 # "Indirect" byte-compilation: write a temporary script and then # run it with the appropriate flags. if not direct: (script_fd, script_name) = tempfile.mkstemp(".py") log.info("writing byte-compilation script '%s'", script_name) if not dry_run: script = os.fdopen(script_fd, "w", encoding='utf-8') with script: script.write( """\ from distutils.util import byte_compile files = [ """ ) # XXX would be nice to write absolute filenames, just for # safety's sake (script should be more robust in the face of # chdir'ing before running it). But this requires abspath'ing # 'prefix' as well, and that breaks the hack in build_lib's # 'byte_compile()' method that carefully tacks on a trailing # slash (os.sep really) to make sure the prefix here is "just # right". This whole prefix business is rather delicate -- the # problem is that it's really a directory, but I'm treating it # as a dumb string, so trailing slashes and so forth matter. script.write(",\n".join(map(repr, py_files)) + "]\n") script.write( f""" byte_compile(files, optimize={optimize!r}, force={force!r}, prefix={prefix!r}, base_dir={base_dir!r}, verbose={verbose!r}, dry_run=False, direct=True) """ ) cmd = [sys.executable] cmd.extend(subprocess._optim_args_from_interpreter_flags()) cmd.append(script_name) spawn(cmd, dry_run=dry_run) execute(os.remove, (script_name,), f"removing {script_name}", dry_run=dry_run) # "Direct" byte-compilation: use the py_compile module to compile # right here, right now. Note that the script generated in indirect # mode simply calls 'byte_compile()' in direct mode, a weird sort of # cross-process recursion. Hey, it works! else: from py_compile import compile for file in py_files: if file[-3:] != ".py": # This lets us be lazy and not filter filenames in # the "install_lib" command. continue # Terminology from the py_compile module: # cfile - byte-compiled file # dfile - purported source filename (same as 'file' by default) if optimize >= 0: opt = '' if optimize == 0 else optimize cfile = importlib.util.cache_from_source(file, optimization=opt) else: cfile = importlib.util.cache_from_source(file) dfile = file if prefix: if file[: len(prefix)] != prefix: raise ValueError( f"invalid prefix: filename {file!r} doesn't start with {prefix!r}" ) dfile = dfile[len(prefix) :] if base_dir: dfile = os.path.join(base_dir, dfile) cfile_base = os.path.basename(cfile) if direct: if force or newer(file, cfile): log.info("byte-compiling %s to %s", file, cfile_base) if not dry_run: compile(file, cfile, dfile) else: log.debug("skipping byte-compilation of %s to %s", file, cfile_base) def rfc822_escape(header: str) -> str: """Return a version of the string escaped for inclusion in an RFC-822 header, by ensuring there are 8 spaces space after each newline. """ indent = 8 * " " lines = header.splitlines(keepends=True) # Emulate the behaviour of `str.split` # (the terminal line break in `splitlines` does not result in an extra line): ends_in_newline = lines and lines[-1].splitlines()[0] != lines[-1] suffix = indent if ends_in_newline else "" return indent.join(lines) + suffix def is_mingw() -> bool: """Returns True if the current platform is mingw. Python compiled with Mingw-w64 has sys.platform == 'win32' and get_platform() starts with 'mingw'. """ return sys.platform == 'win32' and get_platform().startswith('mingw') def is_freethreaded(): """Return True if the Python interpreter is built with free threading support.""" return bool(sysconfig.get_config_var('Py_GIL_DISABLED'))
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