go 获取硬盘的可用空间，在POSIX 系统可以使用syscall.Statfs 库
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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：
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131730866176
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/disk0s2 176757808 47856760 128645048 28% /
/dev/disk0s4 67697660 24802928 42894732 37% /Volumes/BOOTCAMP