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spawn.py4.6 KB · 130 lines
"""distutils.spawn Provides the 'spawn()' function, a front-end to various platform-specific functions for launching another program in a sub-process.Also provides the 'find_executable()' to search the path for a givenexecutable name.""" import sysimport osimport subprocess from distutils.errors import DistutilsPlatformError, DistutilsExecErrorfrom distutils.debug import DEBUGfrom distutils import log  if sys.platform == 'darwin':    _cfg_target = None    _cfg_target_split = None  def spawn(cmd, search_path=1, verbose=0, dry_run=0):    """Run another program, specified as a command list 'cmd', in a new process.     'cmd' is just the argument list for the new process, ie.    cmd[0] is the program to run and cmd[1:] are the rest of its arguments.    There is no way to run a program with a name different from that of its    executable.     If 'search_path' is true (the default), the system's executable    search path will be used to find the program; otherwise, cmd[0]    must be the exact path to the executable.  If 'dry_run' is true,    the command will not actually be run.     Raise DistutilsExecError if running the program fails in any way; just    return on success.    """    # cmd is documented as a list, but just in case some code passes a tuple    # in, protect our %-formatting code against horrible death    cmd = list(cmd)     log.info(' '.join(cmd))    if dry_run:        return     if search_path:        executable = find_executable(cmd[0])        if executable is not None:            cmd[0] = executable     env = None    if sys.platform == 'darwin':        global _cfg_target, _cfg_target_split        if _cfg_target is None:            from distutils import sysconfig            _cfg_target = sysconfig.get_config_var(                                  'MACOSX_DEPLOYMENT_TARGET') or ''            if _cfg_target:                _cfg_target_split = [int(x) for x in _cfg_target.split('.')]        if _cfg_target:            # 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.            cur_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', _cfg_target)            cur_target_split = [int(x) for x in cur_target.split('.')]            if _cfg_target_split[:2] >= [10, 3] and cur_target_split[:2] < [10, 3]:                my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: '                          'now "%s" but "%s" during configure;'                          'must use 10.3 or later'                                % (cur_target, _cfg_target))                raise DistutilsPlatformError(my_msg)            env = dict(os.environ,                       MACOSX_DEPLOYMENT_TARGET=cur_target)     try:        proc = subprocess.Popen(cmd, env=env)        proc.wait()        exitcode = proc.returncode    except OSError as exc:        if not DEBUG:            cmd = cmd[0]        raise DistutilsExecError(            "command %r failed: %s" % (cmd, exc.args[-1])) from exc     if exitcode:        if not DEBUG:            cmd = cmd[0]        raise DistutilsExecError(              "command %r failed with exit code %s" % (cmd, exitcode))  def find_executable(executable, path=None):    """Tries to find 'executable' in the directories listed in 'path'.     A string listing directories separated by 'os.pathsep'; defaults to    os.environ['PATH'].  Returns the complete filename or None if not found.    """    _, ext = os.path.splitext(executable)    if (sys.platform == 'win32') and (ext != '.exe'):        executable = executable + '.exe'     if os.path.isfile(executable):        return executable     if path is None:        path = os.environ.get('PATH', None)        if path is None:            try:                path = os.confstr("CS_PATH")            except (AttributeError, ValueError):                # os.confstr() or CS_PATH is not available                path = os.defpath        # bpo-35755: Don't use os.defpath if the PATH environment variable is        # set to an empty string     # PATH='' doesn't match, whereas PATH=':' looks in the current directory    if not path:        return None     paths = path.split(os.pathsep)    for p in paths:        f = os.path.join(p, executable)        if os.path.isfile(f):            # the file exists, we have a shot at spawn working            return f    return None