util.py 文件源码

def popen(cmd, stdout=None, stderr=None, output_stream=STREAM_BOTH, env=None, extra_env=None):
    """Open a pipe to an external process and return a Popen object."""

    info = None

    if os.name == 'nt':
        info = subprocess.STARTUPINFO()
        info.dwFlags |= subprocess.STARTF_USESTDHANDLES | subprocess.STARTF_USESHOWWINDOW
        info.wShowWindow = subprocess.SW_HIDE

    if output_stream == STREAM_BOTH:
        stdout = stdout or subprocess.PIPE
        stderr = stderr or subprocess.PIPE
    elif output_stream == STREAM_STDOUT:
        stdout = stdout or subprocess.PIPE
        stderr = subprocess.DEVNULL
    else:  # STREAM_STDERR
        stdout = subprocess.DEVNULL
        stderr = stderr or subprocess.PIPE

    if env is None:
        env = create_environment()

    if extra_env is not None:
        env.update(extra_env)

    try:
        return subprocess.Popen(
            cmd,
            stdin=subprocess.PIPE,
            stdout=stdout,
            stderr=stderr,
            startupinfo=info,
            env=env
        )
    except Exception as err:
        from . import persist
        persist.printf('ERROR: could not launch', repr(cmd))
        persist.printf('reason:', str(err))
        persist.printf('PATH:', env.get('PATH', ''))


# view utils