tt: ignore SIGINT at Start command

Closes #325

Author: vr009

cli/running/running.go

@@ -540,6 +540,7 @@ func Start(cmdCtx *cmdcontext.CmdCtx, run *InstanceCtx) error {
 	case <-sigCtx.Done():
 		return nil
 	default:
+		signal.Ignore(syscall.SIGINT, syscall.SIGTERM)
 		wd.Start()
 	}
 	return nil

cli/running/watchdog.go

@@ -37,8 +37,6 @@ type Watchdog struct {
 	restartTimeout time.Duration
 	// stopped indicates whether Watchdog was stopped.
 	stopped bool
-	// stopMutex used to avoid a race condition under stopped field.
-	stopMutex sync.Mutex
 	// done channel used to inform the signal handle goroutine
 	// about termination of the Instance.
 	done chan bool
@@ -73,16 +71,11 @@ func (wd *Watchdog) Start() {
 		}
 		wd.logger = wd.Instance.logger
 		// Start the Instance and forwarding signals (except  SIGINT and SIGTERM)
-		wd.startSignalHandling()
-		wd.stopMutex.Lock()
-		if !wd.stopped {
-			if err := wd.Instance.Start(); err != nil {
-				wd.logger.Printf(`Watchdog(ERROR): "%v".`, err)
-				wd.stopMutex.Unlock()
-				break
-			}
+		if err := wd.Instance.Start(); err != nil {
+			wd.logger.Printf(`Watchdog(ERROR): "%v".`, err)
+			break
 		}
-		wd.stopMutex.Unlock()
+		wd.startSignalHandling()
 
 		// Wait while the Instance will be terminated.
 		if err := wd.Instance.Wait(); err != nil {
@@ -136,12 +129,10 @@ func (wd *Watchdog) startSignalHandling() {
 			case sig := <-sigChan:
 				switch sig {
 				case syscall.SIGINT, syscall.SIGTERM:
-					wd.stopMutex.Lock()
 					wd.Instance.Stop(30 * time.Second)
 					// If we receive one of the "stop" signals, the
 					// program should be terminated.
 					wd.stopped = true
-					wd.stopMutex.Unlock()
 				case syscall.SIGHUP:
 					// Rotate the log files.
 					wd.logger.Rotate()