fix "Failed to enable container runtime: sudo systemctl restart cri-d…

…ocker"

pkg/minikube/cruntime/docker.go

@@ -171,22 +171,36 @@ func (r *Docker) Enable(disOthers bool, cgroupDriver string, inUserNamespace boo
 		return err
 	}
 
+	// restart cri-docker
+	// avoid error: "Exiting due to RUNTIME_ENABLE: Failed to enable container runtime: sudo systemctl restart cri-docker: exit status 1"
+	// => journalctl: "cri-docker.socket: Socket service cri-docker.service already active, refusing."
 	if r.CRIService != "" {
-		if err := r.Init.Enable("cri-docker.socket"); err != nil {
-			return err
+		socket := "cri-docker.socket"
+		service := "cri-docker.service"
+		// allow "native" socket activation:
+		// prevent active socket to reactivate service, that we're going to stop next - 'systemctl status cri-docker.socket': "Triggers: cri-docker.service"
+		// intentionally continue on any error
+		if r.Init.Active(socket) {
+			_ = r.Init.Stop(socket)
 		}
-		if err := r.Init.Unmask(r.CRIService); err != nil {
-			return err
+		if r.Init.Active(service) {
+			_ = r.Init.Stop(service)
 		}
-		if err := r.Init.Enable(r.CRIService); err != nil {
+
+		if err := r.Init.Unmask(socket); err != nil {
 			return err
 		}
-		if err := r.Init.Restart(r.CRIService); err != nil {
+		if err := r.Init.Enable(socket); err != nil {
 			return err
 		}
-		if err := r.Init.Restart("cri-docker"); err != nil {
+		if err := r.Init.Restart(socket); err != nil {
 			return err
 		}
+
+		// try to restart service if stopped, intentionally continue on any error
+		if !r.Init.Active(service) {
+			_ = r.Init.Restart(service)
+		}
 	}
 
 	return nil