func getQueueDir(config *Config) (string, error) {
    var (
        out      []byte
        err      error
        queuedir string
        here     bool
    )
    args := []string{"-h", "queue_directory"}
    if out, err = exec.Command("postconf", args...).Output(); err != nil {
        panic(err)
    }
    queuedir = filepath.Clean(string(out))
    if config.Verbose {
        fmt.Println("Queue dir retrieved from postconf.")
        fmt.Println(queuedir)
    }
    if here, err = util.Exists(queuedir); err != nil {
        return queuedir, err
    } else if here != true {
        return queuedir, ErrQueueDirectoryMissing
    }
    return queuedir, nil
}

func Exists(dirorfile string) (bool, error) {
    if _, err := os.Stat(dirorfile); err != nil {
        if os.IsNotExist(err) {
            return false, nil
        }
        return true, err
    }
    return true, nil
}