Merge pull request #10170 from ashley-cui/machineone

[NO TESTS NEEDED] Check if another VM is running on machine start

pkg/machine/config.go

@@ -30,6 +30,8 @@ var (
 	DefaultIgnitionUserName                      = "core"
 	ErrNoSuchVM                                  = errors.New("VM does not exist")
 	ErrVMAlreadyExists                           = errors.New("VM already exists")
+	ErrVMAlreadyRunning                          = errors.New("VM already running")
+	ErrMultipleActiveVM                          = errors.New("only one VM can be active at a time")
 )
 
 type Download struct {

pkg/machine/qemu/machine.go

@@ -519,3 +519,17 @@ func IsValidVMName(name string) (bool, error) {
 	}
 	return false, nil
 }
+
+// CheckActiveVM checks if there is a VM already running
+func CheckActiveVM() (bool, string, error) {
+	vms, err := GetVMInfos()
+	if err != nil {
+		return false, "", errors.Wrap(err, "error checking VM active")
+	}
+	for _, vm := range vms {
+		if vm.Running {
+			return true, vm.Name, nil
+		}
+	}
+	return false, "", nil
+}