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package main
import (
"bufio"
"os"
"path/filepath"
"strings"
"go.wit.com/log"
)
func isBlockDeviceInUse(dev string) bool {
base := filepath.Base(dev)
// 1. Check /proc/mounts
if isMounted(dev, base) {
log.Info(dev, "dev is mounted (/proc/mounts)")
return true
}
// 2. Check /proc/swaps
if isSwap(dev) {
log.Info(dev, "dev is used by swap (/proc/swaps)")
return true
}
// 3. Check /proc/mdstat for RAID
if isInRAID(base) {
log.Info(dev, "dev is in software raid (/proc/mdstat)")
return true
}
// 4. Check sysfs for device-mapper or LVM use
if hasDMHolders(base) {
log.Info(dev, "dev has lvm partitions")
return true
}
log.Info(dev, "dev appears to be unused")
return false
}
func isMounted(dev, base string) bool {
f, err := os.Open("/proc/mounts")
if err != nil {
return false
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), dev) || strings.Contains(scanner.Text(), base) {
return true
}
}
return false
}
func isSwap(dev string) bool {
f, err := os.Open("/proc/swaps")
if err != nil {
return false
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), dev) {
return true
}
}
return false
}
func isInRAID(base string) bool {
f, err := os.Open("/proc/mdstat")
if err != nil {
return false
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if strings.Contains(scanner.Text(), base) {
return true
}
}
return false
}
func hasDMHolders(base string) bool {
path := filepath.Join("/sys/block", base, "holders")
entries, err := os.ReadDir(path)
return err == nil && len(entries) > 0
}
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