// unlockIfHeld will unlock a lock, if it is held by this machine, or return an error.
func unlockIfHeld(lck *lock.Lock) error {
err := lck.Unlock()
if err == lock.ErrNotExist {
return nil
} else if err == nil {
fmt.Println("Unlocked existing lock for this machine")
return nil
}
return err
}
// lockAndReboot attempts to acquire the lock and reboot the machine in an
// infinite loop. Returns if the reboot failed.
func (r rebooter) lockAndReboot(lck *lock.Lock) {
interval := initialInterval
for {
err := lck.Lock()
if err != nil && err != lock.ErrExist {
interval = expBackoff(interval)
fmt.Printf("Retrying in %v. Error locking: %v\n", interval, err)
time.Sleep(interval)
continue
}
rebootAndSleep(r.lgn)
return
}
}