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Editing: _bootsubprocess.py
""" Basic subprocess implementation for POSIX which only uses os functions. Only implement features required by setup.py to build C extension modules when subprocess is unavailable. setup.py is not used on Windows. """ import os # distutils.spawn used by distutils.command.build_ext # calls subprocess.Popen().wait() class Popen: def __init__(self, cmd, env=None): self._cmd = cmd self._env = env self.returncode = None def wait(self): pid = os.fork() if pid == 0: # Child process try: if self._env is not None: os.execve(self._cmd[0], self._cmd, self._env) else: os.execv(self._cmd[0], self._cmd) finally: os._exit(1) else: # Parent process _, status = os.waitpid(pid, 0) self.returncode = os.waitstatus_to_exitcode(status) return self.returncode def _check_cmd(cmd): # Use regex [a-zA-Z0-9./-]+: reject empty string, space, etc. safe_chars = [] for first, last in (("a", "z"), ("A", "Z"), ("0", "9")): for ch in range(ord(first), ord(last) + 1): safe_chars.append(chr(ch)) safe_chars.append("./-") safe_chars = ''.join(safe_chars) if isinstance(cmd, (tuple, list)): check_strs = cmd elif isinstance(cmd, str): check_strs = [cmd] else: return False for arg in check_strs: if not isinstance(arg, str): return False if not arg: # reject empty string return False for ch in arg: if ch not in safe_chars: return False return True # _aix_support used by distutil.util calls subprocess.check_output() def check_output(cmd, **kwargs): if kwargs: raise NotImplementedError(repr(kwargs)) if not _check_cmd(cmd): raise ValueError(f"unsupported command: {cmd!r}") tmp_filename = "check_output.tmp" if not isinstance(cmd, str): cmd = " ".join(cmd) cmd = f"{cmd} >{tmp_filename}" try: # system() spawns a shell status = os.system(cmd) exitcode = os.waitstatus_to_exitcode(status) if exitcode: raise ValueError(f"Command {cmd!r} returned non-zero " f"exit status {exitcode!r}") try: with open(tmp_filename, "rb") as fp: stdout = fp.read() except FileNotFoundError: stdout = b'' finally: try: os.unlink(tmp_filename) except OSError: pass return stdout
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