Should be a list of absolute paths

def volumes(val, **kwargs):  # pylint: disable=unused-argument
    '''
    Should be a list of absolute paths
    '''
    val = helpers.translate_stringlist(val)
    for item in val:
        if not os.path.isabs(item):
            raise SaltInvocationError(
                '\'{0}\' is not an absolute path'.format(item)
            )
    return val