fix: taskrun still fails even with onerror set to continue

fix #6664

directly modifying the value returned by Lister may affect
the evaluation during the next reconciliation.

pkg/pod/status.go

@@ -189,8 +189,10 @@ func setTaskRunStatusBasedOnStepStatus(ctx context.Context, logger *zap.SugaredL
 	}
 	// Continue with extraction of termination messages
 	for _, s := range stepStatuses {
-		if s.State.Terminated != nil && len(s.State.Terminated.Message) != 0 {
-			msg := s.State.Terminated.Message
+		// Avoid changing the original value by modifying the pointer value.
+		state := s.State.DeepCopy()
+		if state.Terminated != nil && len(state.Terminated.Message) != 0 {
+			msg := state.Terminated.Message
 
 			results, err := termination.ParseMessage(logger, msg)
 			if err != nil {
@@ -217,18 +219,18 @@ func setTaskRunStatusBasedOnStepStatus(ctx context.Context, logger *zap.SugaredL
 					logger.Errorf("%v", err)
 					merr = multierror.Append(merr, err)
 				} else {
-					s.State.Terminated.Message = msg
+					state.Terminated.Message = msg
 				}
 				if time != nil {
-					s.State.Terminated.StartedAt = *time
+					state.Terminated.StartedAt = *time
 				}
 				if exitCode != nil {
-					s.State.Terminated.ExitCode = *exitCode
+					state.Terminated.ExitCode = *exitCode
 				}
 			}
 		}
 		trs.Steps = append(trs.Steps, v1beta1.StepState{
-			ContainerState: *s.State.DeepCopy(),
+			ContainerState: *state,
 			Name:           trimStepPrefix(s.Name),
 			ContainerName:  s.Name,
 			ImageID:        s.ImageID,

pkg/pod/status_test.go

@@ -71,6 +71,17 @@ func TestSetTaskRunStatusBasedOnStepStatus(t *testing.T) {
 					},
 				},
 			}},
+	}, {
+		desc: "The ExitCode in the result cannot modify the original ExitCode",
+		ContainerStatuses: []corev1.ContainerStatus{{
+			Name: "step-bar-0",
+			State: corev1.ContainerState{
+				Terminated: &corev1.ContainerStateTerminated{
+					ExitCode: 0,
+					Message:  `[{"key":"ExitCode","value":"1","type":3}]`,
+				},
+			},
+		}},
 	}} {
 		t.Run(c.desc, func(t *testing.T) {
 			startTime := time.Date(2010, 1, 1, 1, 1, 1, 1, time.UTC)
@@ -88,10 +99,17 @@ func TestSetTaskRunStatusBasedOnStepStatus(t *testing.T) {
 
 			logger, _ := logging.NewLogger("", "status")
 			kubeclient := fakek8s.NewSimpleClientset()
+			originalStatuses := make([]corev1.ContainerStatus, 0, len(c.ContainerStatuses))
+			for _, cs := range c.ContainerStatuses {
+				originalStatuses = append(originalStatuses, *cs.DeepCopy())
+			}
 			merr := setTaskRunStatusBasedOnStepStatus(context.Background(), logger, c.ContainerStatuses, &tr, corev1.PodRunning, kubeclient, &v1beta1.TaskSpec{})
 			if merr != nil {
 				t.Errorf("setTaskRunStatusBasedOnStepStatus: %s", merr)
 			}
+			if d := cmp.Diff(originalStatuses, c.ContainerStatuses); d != "" {
+				t.Errorf("container statuses changed:  %s", diff.PrintWantGot(d))
+			}
 		})
 	}
 }