filesystem.py 文件源码

def clearUnMasked(func):
    """Decorator which clears the umask for a method.
    The umask is a permissions mask that gets applied
    whenever new files or folders are created. For I/O methods
    that have a permissions parameter, it is important that the
    umask is cleared prior to execution, otherwise the default
    umask may alter the resulting permissions

    :type func: function
    """

    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        # set umask to zero, store old umask
        oldMask = os.umask(0)
        try:
            # execute method payload
            return func(*args, **kwargs)
        finally:
            # set mask back to previous value
            os.umask(oldMask)

    return wrapper