def access(path, mode):
    '''
    .. versionadded:: 2014.1.0

    Test whether the Salt process has the specified access to the file. One of
    the following modes must be specified:

    .. code-block::text

        f: Test the existence of the path
        r: Test the readability of the path
        w: Test the writability of the path
        x: Test whether the path can be executed

    CLI Example:

    .. code-block:: bash

        salt '*' file.access /path/to/file f
        salt '*' file.access /path/to/file x
    '''
    path = os.path.expanduser(path)

    if not os.path.isabs(path):
        raise SaltInvocationError('Path to link must be absolute.')

    modes = {'f': os.F_OK,
             'r': os.R_OK,
             'w': os.W_OK,
             'x': os.X_OK}

    if mode in modes:
        return os.access(path, modes[mode])
    elif mode in six.itervalues(modes):
        return os.access(path, mode)
    else:
        raise SaltInvocationError('Invalid mode specified.')