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util.py
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"""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": return "%s-%s.%s" % (osname, version, release) 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) 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() 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 () 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 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 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'"(?:[^"\\]|\\.)*"') 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 () 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) 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,)) 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 () 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)