fsu.go

//try to debug weird filesystem size reported in docker container for cockroachdb
package main

import "fmt"
import "strconv"
import "github.com/elastic/gosigar"
import "syscall"


func getReadableFileSize(inbytes int64) string {

  i := 0
  byteUnits := [9]string{" B", " kB", " MB", " GB", " TB", "PB", "EB", "ZB", "YB"}

  for inbytes > 1024 {
    inbytes = inbytes / 1024
    i += 1
  }

  return strconv.Itoa(int(inbytes)) + byteUnits[i]

}


func getFSU(path string) error {
	stat := syscall.Statfs_t{}
	err := syscall.Statfs(path, &stat)
	if err != nil {
		return err
	}

	fmt.Println("Bsize: " + strconv.FormatUint(uint64(stat.Bsize), 10))
  fmt.Println("Bfree: " + strconv.FormatUint(stat.Bfree, 10))
  fmt.Println("Bavail: " + strconv.FormatUint(stat.Bavail, 10))
  fmt.Println("Blocks: " + strconv.FormatUint(stat.Blocks, 10))

	return nil
}

func main() {
    fileSystemUsage := gosigar.FileSystemUsage{}

    fileSystemUsage.Get(".")

    fsuTotal := int64(fileSystemUsage.Total)
    fsuAvail := int64(fileSystemUsage.Avail)

    fmt.Println(fsuTotal)
    fmt.Println(fsuAvail)

    fmt.Println(getReadableFileSize(fsuTotal))
    fmt.Println(getReadableFileSize(fsuAvail))

    fmt.Println("FSU for /:")
    getFSU("/")

    fmt.Println("FSU for .:")
    getFSU(".")

}