Disk Info for Golang

diskinfo.go

package main

import (
	"fmt"
	"syscall"
)

type DiskStatus struct {
	All  uint64 `json:"all"`
	Used uint64 `json:"used"`
	Free uint64 `json:"free"`
}

// disk usage of path/disk
func DiskUsage(path string) (disk DiskStatus) {
	fs := syscall.Statfs_t{}
	err := syscall.Statfs(path, &fs)
	if err != nil {
		return
	}
	disk.All = fs.Blocks * uint64(fs.Bsize)
	disk.Free = fs.Bfree * uint64(fs.Bsize)
	disk.Used = disk.All - disk.Free
	return
}

const (
	B  = 1
	KB = 1024 * B
	MB = 1024 * KB
	GB = 1024 * MB
)

func main() {
	disk := DiskUsage("/")
	fmt.Printf("All: %.2f GB\n", float64(disk.All)/float64(GB))
	fmt.Printf("Used: %.2f GB\n", float64(disk.Used)/float64(GB))
	fmt.Printf("Free: %.2f GB\n", float64(disk.Free)/float64(GB))
}

I've post an updated version:

https://gist.github.com/ttys3/21e2a1215cf1905ab19ddcec03927c75

For others:

func (d *diskService) GetDiskUtilization() *models.DiskUtilizationSummary {
	var stat syscall.Statfs_t
	wd, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	syscall.Statfs(wd, &stat)
	all := stat.Blocks * uint64(stat.Bsize)
	free := stat.Bfree * uint64(stat.Bsize)
	used := all - free
	percentageUtilized := float64(used) / float64(all) * float64(100)
	return &models.DiskUtilizationSummary{
		PercentageUtilized: int8(percentageUtilized),
		TotalDiskBytes:     int64(all),
	}
}