Source code for distutils.util
From Get docs
Python/docs/3.9/ modules/distutils/util
Source code for distutils.util
"""distutils.util
Miscellaneous utility functions -- anything that doesn't fit into
one of the other *util.py modules.
"""
import os
import re
import importlib.util
import string
import sys
from distutils.errors import DistutilsPlatformError
from distutils.dep_util import newer
from distutils.spawn import spawn
from distutils import log
from distutils.errors import DistutilsByteCompileError
def get_host_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. on Linux, the kernel version isn't
particularly important.
Examples of returned values:
linux-i586
linux-alpha (?)
solaris-2.6-sun4u
Windows will return one of:
win-amd64 (64bit Windows on AMD64 (aka x86_64, Intel64, EM64T, etc)
win32 (all others - specifically, sys.platform is returned)
For other non-POSIX platforms, currently just returns 'sys.platform'.
"""
if os.name == 'nt':
if 'amd64' in sys.version.lower():
return 'win-amd64'
if '(arm)' in sys.version.lower():
return 'win-arm32'
if '(arm64)' in sys.version.lower():
return 'win-arm64'
return sys.platform
# Set for cross builds explicitly
if "_PYTHON_HOST_PLATFORM" in os.environ:
return os.environ["_PYTHON_HOST_PLATFORM"]
if os.name != "posix" or not hasattr(os, 'uname'):
# XXX what about the architecture? NT is Intel or Alpha,
# Mac OS is M68k or PPC, etc.
return sys.platform
# Try to distinguish various flavours of Unix
(osname, host, release, version, machine) = os.uname()
# Convert the OS name to lowercase, remove '/' characters, and translate
# spaces (for "Power Macintosh")
osname = osname.lower().replace('/', '')
machine = machine.replace(' ', '_')
machine = machine.replace('/', '-')
if osname[:5] == "linux":
# At least on Linux/Intel, 'machine' is the processor --
# i386, etc.
# XXX what about Alpha, SPARC, etc?
return "%s-%s" % (osname, machine)
elif osname[:5] == "sunos":
if release[0] >= "5": # SunOS 5 == Solaris 2
osname = "solaris"
release = "%d.%s" % (int(release[0]) - 3, release[2:])
# We can't use "platform.architecture()[0]" because a
# bootstrap problem. We use a dict to get an error
# if some suspicious happens.
bitness = {2147483647:"32bit", 9223372036854775807:"64bit"}
machine += ".%s" % bitness[sys.maxsize]
# fall through to standard osname-release-machine representation
elif osname[:3] == "aix":
from _aix_support import aix_platform
return aix_platform()
elif osname[:6] == "cygwin":
osname = "cygwin"
rel_re = re.compile (r'[\d.]+', re.ASCII)
m = rel_re.match(release)
if m:
release = m.group()
elif osname[:6] == "darwin":
import _osx_support, distutils.sysconfig
osname, release, machine = _osx_support.get_platform_osx(
distutils.sysconfig.get_config_vars(),
osname, release, machine)
return "%s-%s-%s" % (osname, release, machine)
[docs]def get_platform():
if os.name == 'nt':
TARGET_TO_PLAT = {
'x86' : 'win32',
'x64' : 'win-amd64',
'arm' : 'win-arm32',
}
return TARGET_TO_PLAT.get(os.environ.get('VSCMD_ARG_TGT_ARCH')) or get_host_platform()
else:
return get_host_platform()
[docs]def convert_path (pathname):
"""Return 'pathname' as a name that will work on the native filesystem,
i.e. split it on '/' and put it back together again using the current
directory separator. Needed because filenames in the setup script are
always supplied in Unix style, and have to be converted to the local
convention before we can actually use them in the filesystem. Raises
ValueError on non-Unix-ish systems if 'pathname' either starts or
ends with a slash.
"""
if os.sep == '/':
return pathname
if not pathname:
return pathname
if pathname[0] == '/':
raise ValueError("path '%s' cannot be absolute" % pathname)
if pathname[-1] == '/':
raise ValueError("path '%s' cannot end with '/'" % pathname)
paths = pathname.split('/')
while '.' in paths:
paths.remove('.')
if not paths:
return os.curdir
return os.path.join(*paths)
# convert_path ()
[docs]def change_root (new_root, pathname):
"""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] == '\\':
path = path[1:]
return os.path.join(new_root, path)
else:
raise DistutilsPlatformError("nothing known about platform '%s'" % os.name)
_environ_checked = 0
[docs]def check_environ ():
"""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()')
"""
global _environ_checked
if _environ_checked:
return
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()
_environ_checked = 1
[docs]def subst_vars (s, local_vars):
"""Perform shell/Perl-style variable substitution on 'string'. Every
occurrence of '$' followed by a name is considered a variable, and
variable is substituted by the value found in the 'local_vars'
dictionary, or in 'os.environ' if it's not in 'local_vars'.
'os.environ' is first checked/augmented to guarantee that it contains
certain values: see 'check_environ()'. Raise ValueError for any
variables not found in either 'local_vars' or 'os.environ'.
"""
check_environ()
def _subst (match, local_vars=local_vars):
var_name = match.group(1)
if var_name in local_vars:
return str(local_vars[var_name])
else:
return os.environ[var_name]
try:
return re.sub(r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, s)
except KeyError as var:
raise ValueError("invalid variable '$%s'" % var)
# subst_vars ()
def grok_environment_error (exc, prefix="error: "):
# 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(r'[^\\\'\"%s ]*' % string.whitespace)
_squote_re = re.compile(r"'(?:[^'\\]|\\.)*'")
_dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"')
[docs]def split_quoted (s):
"""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
words.append(s[:end]) # we definitely have a word delimiter
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("this can't happen (bad char '%c')" % s[end])
if m is None:
raise ValueError("bad string (mismatched %s quotes?)" % s[end])
(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 ()
[docs]def execute (func, args, msg=None, verbose=0, dry_run=0):
"""Perform some action that affects the outside world (eg. by
writing to the filesystem). Such actions are special because they
are disabled by the 'dry_run' flag. This method takes care of all
that bureaucracy for you; all you have to do is supply the
function to call and an argument tuple for it (to embody the
"external action" being performed), and an optional message to
print.
"""
if msg is None:
msg = "%s%r" % (func.__name__, args)
if msg[-2:] == ',)': # correct for singleton tuple
msg = msg[0:-2] + ')'
log.info(msg)
if not dry_run:
func(*args)
[docs]def strtobool (val):
"""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 1
elif val in ('n', 'no', 'f', 'false', 'off', '0'):
return 0
else:
raise ValueError("invalid truth value %r" % (val,))
[docs]def byte_compile (py_files,
optimize=0, force=0,
prefix=None, base_dir=None,
verbose=1, dry_run=0,
direct=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.
"""
# Late import to fix a bootstrap issue: _posixsubprocess is built by
# setup.py, but setup.py uses distutils.
import subprocess
# 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:
try:
from tempfile import mkstemp
(script_fd, script_name) = mkstemp(".py")
except ImportError:
from tempfile import mktemp
(script_fd, script_name) = None, mktemp(".py")
log.info("writing byte-compilation script '%s'", script_name)
if not dry_run:
if script_fd is not None:
script = os.fdopen(script_fd, "w")
else:
script = open(script_name, "w")
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.
#py_files = map(os.path.abspath, py_files)
#if prefix:
# prefix = os.path.abspath(prefix)
script.write(",\n".join(map(repr, py_files)) + "]\n")
script.write("""
byte_compile(files, optimize=%r, force=%r,
prefix=%r, base_dir=%r,
verbose=%r, dry_run=0,
direct=1)
""" % (optimize, force, prefix, base_dir, verbose))
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,), "removing %s" % 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("invalid prefix: filename %r doesn't start with %r"
% (file, prefix))
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)
# byte_compile ()
[docs]def rfc822_escape (header):
"""Return a version of the string escaped for inclusion in an
RFC-822 header, by ensuring there are 8 spaces space after each newline.
"""
lines = header.split('\n')
sep = '\n' + 8 * ' '
return sep.join(lines)
# 2to3 support
def run_2to3(files, fixer_names=None, options=None, explicit=None):
"""Invoke 2to3 on a list of Python files.
The files should all come from the build area, as the
modification is done in-place. To reduce the build time,
only files modified since the last invocation of this
function should be passed in the files argument."""
if not files:
return
# Make this class local, to delay import of 2to3
from lib2to3.refactor import RefactoringTool, get_fixers_from_package
class DistutilsRefactoringTool(RefactoringTool):
def log_error(self, msg, *args, **kw):
log.error(msg, *args)
def log_message(self, msg, *args):
log.info(msg, *args)
def log_debug(self, msg, *args):
log.debug(msg, *args)
if fixer_names is None:
fixer_names = get_fixers_from_package('lib2to3.fixes')
r = DistutilsRefactoringTool(fixer_names, options=options)
r.refactor(files, write=True)
def copydir_run_2to3(src, dest, template=None, fixer_names=None,
options=None, explicit=None):
"""Recursively copy a directory, only copying new and changed files,
running run_2to3 over all newly copied Python modules afterward.
If you give a template string, it's parsed like a MANIFEST.in.
"""
from distutils.dir_util import mkpath
from distutils.file_util import copy_file
from distutils.filelist import FileList
filelist = FileList()
curdir = os.getcwd()
os.chdir(src)
try:
filelist.findall()
finally:
os.chdir(curdir)
filelist.files[:] = filelist.allfiles
if template:
for line in template.splitlines():
line = line.strip()
if not line: continue
filelist.process_template_line(line)
copied = []
for filename in filelist.files:
outname = os.path.join(dest, filename)
mkpath(os.path.dirname(outname))
res = copy_file(os.path.join(src, filename), outname, update=1)
if res[1]: copied.append(outname)
run_2to3([fn for fn in copied if fn.lower().endswith('.py')],
fixer_names=fixer_names, options=options, explicit=explicit)
return copied
class Mixin2to3:
'''Mixin class for commands that run 2to3.
To configure 2to3, setup scripts may either change
the class variables, or inherit from individual commands
to override how 2to3 is invoked.'''
# provide list of fixers to run;
# defaults to all from lib2to3.fixers
fixer_names = None
# options dictionary
options = None
# list of fixers to invoke even though they are marked as explicit
explicit = None
def run_2to3(self, files):
return run_2to3(files, self.fixer_names, self.options, self.explicit)
