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