Function _exec_command

numpy/distutils/exec_command.py:253–302

Internal workhorse for exec_command().

(command, use_shell=None, use_tee = None, **env)

def _exec_command(command, use_shell=None, use_tee = None, **env):
    """
    Internal workhorse for exec_command().
    """
    if use_shell is None:
        use_shell = os.name=='posix'
    if use_tee is None:
        use_tee = os.name=='posix'

    if os.name == 'posix' and use_shell:
        # On POSIX, subprocess always uses /bin/sh, override
        sh = os.environ.get('SHELL', '/bin/sh')
        if is_sequence(command):
            command = [sh, '-c', ' '.join(command)]
        else:
            command = [sh, '-c', command]
        use_shell = False

    elif os.name == 'nt' and is_sequence(command):
        # On Windows, join the string for CreateProcess() ourselves as
        # subprocess does it a bit differently
        command = ' '.join(_quote_arg(arg) for arg in command)

    # Inherit environment by default
    env = env or None
    try:
        # text is set to False so that communicate()
        # will return bytes. We need to decode the output ourselves
        # so that Python will not raise a UnicodeDecodeError when
        # it encounters an invalid character; rather, we simply replace it
        proc = subprocess.Popen(command, shell=use_shell, env=env, text=False,
                                stdout=subprocess.PIPE,
                                stderr=subprocess.STDOUT)
    except OSError:
        # Return 127, as os.spawn*() and /bin/sh do
        return 127, ''

    text, err = proc.communicate()
    mylocale = locale.getpreferredencoding(False)
    if mylocale is None:
        mylocale = 'ascii'
    text = text.decode(mylocale, errors='replace')
    text = text.replace('\r\n', '\n')
    # Another historical oddity
    if text[-1:] == '\n':
        text = text[:-1]

    if use_tee and text:
        print(text)
    return proc.returncode, text


def _quote_arg(arg):