Add custom pod conversion functions from pre-v1.1 mirror pods

pkg/api/v1/backward_compatibility_test.go

@@ -153,6 +153,68 @@ func TestCompatibility_v1_PodSecurityContext(t *testing.T) {
 				"spec.hostPID",
 			},
 		},
+		{
+			name: "reseting defaults for pre-v1.1 mirror pods",
+			input: `
+{
+	"kind":"Pod",
+	"apiVersion":"v1",
+	"metadata":{
+		"name":"my-pod-name",
+		"namespace":"my-pod-namespace",
+		"annotations": {
+			"kubernetes.io/config.mirror": "mirror"
+		}
+	},
+	"spec": {
+		"containers":[{
+			"name":"a",
+			"image":"my-container-image",
+			"resources": {
+				"limits": {
+					"cpu": "100m"
+				}
+			}
+		}]
+	}
+}
+`,
+			absentKeys: []string{
+				"spec.terminationGracePeriodSeconds",
+				"spec.containers[0].resources.requests",
+			},
+		},
+		{
+			name: "preserving defaults for v1.1+ mirror pods",
+			input: `
+		{
+			"kind":"Pod",
+			"apiVersion":"v1",
+			"metadata":{
+				"name":"my-pod-name",
+				"namespace":"my-pod-namespace",
+				"annotations": {
+					"kubernetes.io/config.mirror": "cbe924f710c7e26f7693d6a341bcfad0"
+				}
+			},
+			"spec": {
+				"containers":[{
+					"name":"a",
+					"image":"my-container-image",
+					"resources": {
+						"limits": {
+							"cpu": "100m"
+						}
+					}
+				}]
+			}
+		}
+		`,
+			expectedKeys: map[string]string{
+				"spec.terminationGracePeriodSeconds":    "30",
+				"spec.containers[0].resources.requests": "map[cpu:100m]",
+			},
+		},
 	}
 
 	validator := func(obj runtime.Object) fielderrors.ValidationErrorList {

pkg/api/v1/conversion.go

@@ -24,12 +24,22 @@ import (
 	"k8s.io/kubernetes/pkg/conversion"
 )
 
+const (
+	// Annotation key used to identify mirror pods.
+	mirrorAnnotationKey = "kubernetes.io/config.mirror"
+
+	// Value used to identify mirror pods from pre-v1.1 kubelet.
+	mirrorAnnotationValue_1_0 = "mirror"
+)
+
 func addConversionFuncs() {
 	// Add non-generated conversion functions
 	err := api.Scheme.AddConversionFuncs(
+		convert_api_Pod_To_v1_Pod,
 		convert_api_PodSpec_To_v1_PodSpec,
 		convert_api_ReplicationControllerSpec_To_v1_ReplicationControllerSpec,
 		convert_api_ServiceSpec_To_v1_ServiceSpec,
+		convert_v1_Pod_To_api_Pod,
 		convert_v1_PodSpec_To_api_PodSpec,
 		convert_v1_ReplicationControllerSpec_To_api_ReplicationControllerSpec,
 		convert_v1_ServiceSpec_To_api_ServiceSpec,
@@ -386,9 +396,32 @@ func convert_v1_PodSpec_To_api_PodSpec(in *PodSpec, out *api.PodSpec, s conversi
 	} else {
 		out.ImagePullSecrets = nil
 	}
+
 	return nil
 }
 
+func convert_api_Pod_To_v1_Pod(in *api.Pod, out *Pod, s conversion.Scope) error {
+	if err := autoconvert_api_Pod_To_v1_Pod(in, out, s); err != nil {
+		return err
+	}
+	// We need to reset certain fields for mirror pods from pre-v1.1 kubelet
+	// (#15960).
+	// TODO: Remove this code after we drop support for v1.0 kubelets.
+	if value, ok := in.Annotations[mirrorAnnotationKey]; ok && value == mirrorAnnotationValue_1_0 {
+		// Reset the TerminationGracePeriodSeconds.
+		out.Spec.TerminationGracePeriodSeconds = nil
+		// Reset the resource requests.
+		for i := range out.Spec.Containers {
+			out.Spec.Containers[i].Resources.Requests = nil
+		}
+	}
+	return nil
+}
+
+func convert_v1_Pod_To_api_Pod(in *Pod, out *api.Pod, s conversion.Scope) error {
+	return autoconvert_v1_Pod_To_api_Pod(in, out, s)
+}
+
 func convert_api_ServiceSpec_To_v1_ServiceSpec(in *api.ServiceSpec, out *ServiceSpec, s conversion.Scope) error {
 	if err := autoconvert_api_ServiceSpec_To_v1_ServiceSpec(in, out, s); err != nil {
 		return err

pkg/api/v1/conversion_generated.go

@@ -1887,10 +1887,6 @@ func autoconvert_api_Pod_To_v1_Pod(in *api.Pod, out *Pod, s conversion.Scope) er
 	return nil
 }
 
-func convert_api_Pod_To_v1_Pod(in *api.Pod, out *Pod, s conversion.Scope) error {
-	return autoconvert_api_Pod_To_v1_Pod(in, out, s)
-}
-
 func autoconvert_api_PodAttachOptions_To_v1_PodAttachOptions(in *api.PodAttachOptions, out *PodAttachOptions, s conversion.Scope) error {
 	if defaulting, found := s.DefaultingInterface(reflect.TypeOf(*in)); found {
 		defaulting.(func(*api.PodAttachOptions))(in)
@@ -4912,10 +4908,6 @@ func autoconvert_v1_Pod_To_api_Pod(in *Pod, out *api.Pod, s conversion.Scope) er
 	return nil
 }
 
-func convert_v1_Pod_To_api_Pod(in *Pod, out *api.Pod, s conversion.Scope) error {
-	return autoconvert_v1_Pod_To_api_Pod(in, out, s)
-}
-
 func autoconvert_v1_PodAttachOptions_To_api_PodAttachOptions(in *PodAttachOptions, out *api.PodAttachOptions, s conversion.Scope) error {
 	if defaulting, found := s.DefaultingInterface(reflect.TypeOf(*in)); found {
 		defaulting.(func(*PodAttachOptions))(in)