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| """ | |
| 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 | |