golang 递归获取目录大小

func readDir(dirPath string, dirSize int64) int64 {
    flist, e := ioutil.ReadDir(dirPath)
    if e != nil {
        fmt.Println("read file error")
        return
    }
    for _, f := range flist {
        if f.IsDir() {
            dirSize= readDir(dirPath+"/"+f.Name()) + dirSize
        } else {
            dirSize= f.Size() + dirSize
        }
    }
    return dirSize
}

• https://golang.org/pkg/os/#FileInfo
• https://golang.org/pkg/io/ioutil/#ReadDir

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