update equalResourcesInPlaceFields logic

pkg/controller/instanceset/in_place_update_util.go

@@ -259,7 +259,10 @@ func equalBasicInPlaceFields(old, new *corev1.Pod) bool {
 
 func equalResourcesInPlaceFields(old, new *corev1.Pod) bool {
 	if len(old.Spec.Containers) != len(new.Spec.Containers) {
-		return false
+		if len(old.Spec.Containers) < len(new.Spec.Containers) {
+			return false
+		}
+		return isContainerInjected(old.Spec.Containers, new.Spec.Containers)
 	}
 	for _, nc := range new.Spec.Containers {
 		index := slices.IndexFunc(old.Spec.Containers, func(oc corev1.Container) bool {
@@ -336,6 +339,21 @@ func getPodUpdatePolicy(its *workloads.InstanceSet, pod *corev1.Pod) (PodUpdateP
 	return NoOpsPolicy, nil
 }
 
+func isContainerInjected(ocs, ncs []corev1.Container) bool {
+	for _, nc := range ncs {
+		index := slices.IndexFunc(ocs, func(oc corev1.Container) bool {
+			return nc.Name == oc.Name
+		})
+		if index < 0 {
+			return false
+		}
+		if nc.Image != ocs[index].Image {
+			return false
+		}
+	}
+	return true
+}
+
 // IsPodUpdated tells whether the pod's spec is as expected in the InstanceSet.
 // This function is meant to replace the old fashion `GetPodRevision(pod) == updateRevision`,
 // as the pod template revision has been redefined in instanceset.

pkg/controller/instanceset/in_place_update_util_test.go

@@ -198,6 +198,28 @@ var _ = Describe("instance util test", func() {
 			policy, err = getPodUpdatePolicy(its, pod5)
 			Expect(err).Should(BeNil())
 			Expect(policy).Should(Equal(NoOpsPolicy))
+
+			By("build a pod without revision updated, with IgnorePodVerticalScaling disabled")
+			pod6 := pod1.DeepCopy()
+			pod6.Spec.Containers = append(pod6.Spec.Containers, corev1.Container{
+				Name:  "sidecar1",
+				Image: "bar2",
+				Ports: []corev1.ContainerPort{
+					{
+						Name:          "my-svc",
+						Protocol:      corev1.ProtocolTCP,
+						ContainerPort: 54321,
+					},
+				},
+			})
+			randStr = rand.String(16)
+			mergeMap(&map[string]string{key: randStr}, &pod6.Annotations)
+			ignorePodVerticalScaling = viper.GetBool(FeatureGateIgnorePodVerticalScaling)
+			defer viper.Set(FeatureGateIgnorePodVerticalScaling, ignorePodVerticalScaling)
+			viper.Set(FeatureGateIgnorePodVerticalScaling, false)
+			policy, err = getPodUpdatePolicy(its, pod6)
+			Expect(err).Should(BeNil())
+			Expect(policy).Should(Equal(InPlaceUpdatePolicy))
 		})
 	})
 })