mirror of https://github.com/jetkvm/kvm.git
80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
package kvm
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import (
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"fmt"
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"os"
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"regexp"
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"sync"
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"time"
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)
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func extractSerialNumber() (string, error) {
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content, err := os.ReadFile("/proc/cpuinfo")
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if err != nil {
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return "", err
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}
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r, err := regexp.Compile(`Serial\s*:\s*(\S+)`)
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if err != nil {
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return "", fmt.Errorf("failed to compile regex: %w", err)
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}
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matches := r.FindStringSubmatch(string(content))
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if len(matches) < 2 {
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return "", fmt.Errorf("no serial found")
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}
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return matches[1], nil
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}
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func readOtpEntropy() ([]byte, error) { //nolint:unused
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content, err := os.ReadFile("/sys/bus/nvmem/devices/rockchip-otp0/nvmem")
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if err != nil {
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return nil, err
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}
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return content[0x17:0x1C], nil
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}
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var deviceID string
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var deviceIDOnce sync.Once
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func GetDeviceID() string {
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deviceIDOnce.Do(func() {
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serial, err := extractSerialNumber()
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if err != nil {
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logger.Warn().Msg("unknown serial number, the program likely not running on RV1106")
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deviceID = "unknown_device_id"
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} else {
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deviceID = serial
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}
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})
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return deviceID
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}
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func runWatchdog() {
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file, err := os.OpenFile("/dev/watchdog", os.O_WRONLY, 0)
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if err != nil {
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logger.Warn().Err(err).Msg("unable to open /dev/watchdog, skipping watchdog reset")
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return
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}
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defer file.Close()
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ticker := time.NewTicker(10 * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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_, err = file.Write([]byte{0})
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if err != nil {
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logger.Warn().Err(err).Msg("error writing to /dev/watchdog, system may reboot")
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}
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case <-appCtx.Done():
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//disarm watchdog with magic value
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_, err := file.Write([]byte("V"))
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if err != nil {
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logger.Warn().Err(err).Msg("failed to disarm watchdog, system may reboot")
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}
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return
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}
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}
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}
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