go 获取硬盘的可用空间的方法

go 获取硬盘的可用空间，在POSIX 系统可以使用syscall.Statfs 库

package main

import (
    "fmt"
    "os"
    "syscall"
)

func main() {
    var stat syscall.Statfs_t

    wd, _ := os.Getwd()

    syscall.Statfs(wd, &stat)

    // Available blocks * size per block = available space in bytes
    fmt.Println(stat.Bavail * uint64(stat.Bsize))
}

输出：

131730866176
$ df
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/disk0s2   176757808 47856760 128645048  28% /
/dev/disk0s4    67697660 24802928  42894732  37% /Volumes/BOOTCAMP