Method ScanDevices

agent/smart.go:155–226

ScanDevices scans for SMART devices Scan devices using `smartctl --scan -j` If scan fails, return error If scan succeeds, parse the output and update the SmartDevices slice

(force bool)

// If scan fails, return error
// If scan succeeds, parse the output and update the SmartDevices slice
func (sm *SmartManager) ScanDevices(force bool) error {
	if !force && time.Since(sm.lastScanTime) < 30*time.Minute {
		return nil
	}
	sm.lastScanTime = time.Now()
	currentDevices := sm.devicesSnapshot()

	var configuredDevices []*DeviceInfo
	if configuredRaw, ok := utils.GetEnv("SMART_DEVICES"); ok {
		slog.Info("SMART_DEVICES", "value", configuredRaw)
		config := strings.TrimSpace(configuredRaw)
		if config == "" {
			return errNoValidSmartData
		}

		parsedDevices, err := sm.parseConfiguredDevices(config)
		if err != nil {
			return err
		}
		configuredDevices = parsedDevices
	}

	var (
		scanErr        error
		scannedDevices []*DeviceInfo
		hasValidScan   bool
	)

	if sm.smartctlPath != "" {
		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()

		cmd := exec.CommandContext(ctx, sm.smartctlPath, "--scan", "-j")
		output, err := cmd.Output()
		if err != nil {
			scanErr = err
		} else {
			scannedDevices, hasValidScan = sm.parseScan(output)
			if !hasValidScan {
				scanErr = errNoValidSmartData
			}
		}
	}

	// Add eMMC devices (Linux only) by reading sysfs health fields. This does not
	// require smartctl and does not scan the whole device.
	if emmcDevices := scanEmmcDevices(); len(emmcDevices) > 0 {
		scannedDevices = append(scannedDevices, emmcDevices...)
		hasValidScan = true
	}

	// Add Linux mdraid arrays by reading sysfs health fields. This does not
	// require smartctl and does not scan the whole device.
	if raidDevices := scanMdraidDevices(); len(raidDevices) > 0 {
		scannedDevices = append(scannedDevices, raidDevices...)
		hasValidScan = true
	}