Coverage for /pythoncovmergedfiles/medio/medio/usr/lib/python3.9/_bootsubprocess.py: 0%

1""" 

2Basic subprocess implementation for POSIX which only uses os functions. Only 

3implement features required by setup.py to build C extension modules when 

4subprocess is unavailable. setup.py is not used on Windows. 

5""" 

6import os 

7 

8 

9# distutils.spawn used by distutils.command.build_ext 

10# calls subprocess.Popen().wait() 

11class Popen: 

12 def __init__(self, cmd, env=None): 

13 self._cmd = cmd 

14 self._env = env 

15 self.returncode = None 

16 

17 def wait(self): 

18 pid = os.fork() 

19 if pid == 0: 

20 # Child process 

21 try: 

22 if self._env is not None: 

23 os.execve(self._cmd[0], self._cmd, self._env) 

24 else: 

25 os.execv(self._cmd[0], self._cmd) 

26 finally: 

27 os._exit(1) 

28 else: 

29 # Parent process 

30 _, status = os.waitpid(pid, 0) 

31 self.returncode = os.waitstatus_to_exitcode(status) 

32 

33 return self.returncode 

34 

35 

36def _check_cmd(cmd): 

37 # Use regex [a-zA-Z0-9./-]+: reject empty string, space, etc. 

38 safe_chars = [] 

39 for first, last in (("a", "z"), ("A", "Z"), ("0", "9")): 

40 for ch in range(ord(first), ord(last) + 1): 

41 safe_chars.append(chr(ch)) 

42 safe_chars.append("./-") 

43 safe_chars = ''.join(safe_chars) 

44 

45 if isinstance(cmd, (tuple, list)): 

46 check_strs = cmd 

47 elif isinstance(cmd, str): 

48 check_strs = [cmd] 

49 else: 

50 return False 

51 

52 for arg in check_strs: 

53 if not isinstance(arg, str): 

54 return False 

55 if not arg: 

56 # reject empty string 

57 return False 

58 for ch in arg: 

59 if ch not in safe_chars: 

60 return False 

61 

62 return True 

63 

64 

65# _aix_support used by distutil.util calls subprocess.check_output() 

66def check_output(cmd, **kwargs): 

67 if kwargs: 

68 raise NotImplementedError(repr(kwargs)) 

69 

70 if not _check_cmd(cmd): 

71 raise ValueError(f"unsupported command: {cmd!r}") 

72 

73 tmp_filename = "check_output.tmp" 

74 if not isinstance(cmd, str): 

75 cmd = " ".join(cmd) 

76 cmd = f"{cmd} >{tmp_filename}" 

77 

78 try: 

79 # system() spawns a shell 

80 status = os.system(cmd) 

81 exitcode = os.waitstatus_to_exitcode(status) 

82 if exitcode: 

83 raise ValueError(f"Command {cmd!r} returned non-zero " 

84 f"exit status {exitcode!r}") 

85 

86 try: 

87 with open(tmp_filename, "rb") as fp: 

88 stdout = fp.read() 

89 except FileNotFoundError: 

90 stdout = b'' 

91 finally: 

92 try: 

93 os.unlink(tmp_filename) 

94 except OSError: 

95 pass 

96 

97 return stdout