fix: allow configuring powermode check to work better with SSDs

fixes #91

main.go

@@ -111,6 +111,9 @@ var (
 	smartctlFakeData = kingpin.Flag("smartctl.fake-data",
 		"The device to monitor (repeatable)",
 	).Default("false").Hidden().Bool()
+	smartctlPowerModeCheck = kingpin.Flag("smartctl.powermode-check",
+		"Whether or not to check powermode before fetching data",
+	).Default("standby").String()
 )
 
 // scanDevices uses smartctl to gather the list of available devices.

readjson.go

@@ -64,7 +64,7 @@ func readFakeSMARTctl(logger log.Logger, device Device) gjson.Result {
 // Get json from smartctl and parse it
 func readSMARTctl(logger log.Logger, device Device) (gjson.Result, bool) {
 	start := time.Now()
-	out, err := exec.Command(*smartctlPath, "--json", "--info", "--health", "--attributes", "--tolerance=verypermissive", "--nocheck=standby", "--format=brief", "--log=error", "--device="+device.Type, device.Name).Output()
+	out, err := exec.Command(*smartctlPath, "--json", "--info", "--health", "--attributes", "--tolerance=verypermissive", "--nocheck="+*smartctlPowerModeCheck, "--format=brief", "--log=error", "--device="+device.Type, device.Name).Output()
 	if err != nil {
 		level.Warn(logger).Log("msg", "S.M.A.R.T. output reading", "err", err, "device", device.Info_Name)
 	}