Add extract apply function generation

2025-07-31 07:20:13 +00:00 · 2021-02-26 14:17:39 -08:00 · 2021-02-26 14:17:39 -08:00 · 987657a80f
commit 987657a80f
parent 5bc72f37a4
16 changed files with 1216 additions and 8 deletions
--- a/hack/update-codegen.sh
+++ b/hack/update-codegen.sh
@ -26,11 +26,13 @@ source "${KUBE_ROOT}/hack/lib/init.sh"

 kube::golang::setup_env

+go install k8s.io/kubernetes/pkg/generated/openapi/cmd/models-schema
 go install k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/client-gen
 go install k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/lister-gen
 go install k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/informer-gen
 go install k8s.io/kubernetes/vendor/k8s.io/code-generator/cmd/applyconfiguration-gen

+modelsschema=$(kube::util::find-binary "models-schema")
 clientgen=$(kube::util::find-binary "client-gen")
 listergen=$(kube::util::find-binary "lister-gen")
 informergen=$(kube::util::find-binary "informer-gen")
@ -66,6 +68,7 @@ applyconfigurationgen_external_apis+=("k8s.io/apimachinery/pkg/apis/meta/v1")
 applyconfigurationgen_external_apis_csv=$(IFS=,; echo "${applyconfigurationgen_external_apis[*]}")
 applyconfigurations_package="k8s.io/client-go/applyconfigurations"
 ${applyconfigurationgen} \
+  --openapi-schema <(${modelsschema}) \
  --output-base "${KUBE_ROOT}/vendor" \
  --output-package "${applyconfigurations_package}" \
  --input-dirs "${applyconfigurationgen_external_apis_csv}" \
--- a/pkg/generated/openapi/cmd/models-schema/main.go
+++ b/pkg/generated/openapi/cmd/models-schema/main.go
@ -0,0 +1,79 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/go-openapi/spec"
+
+	"k8s.io/kubernetes/pkg/generated/openapi"
+)
+
+// Outputs openAPI schema JSON containing the schema definitions in zz_generated.openapi.go.
+func main() {
+	err := output()
+	if err != nil {
+		os.Stderr.WriteString(fmt.Sprintf("Failed: %v", err))
+		os.Exit(1)
+	}
+}
+
+func output() error {
+	refFunc := func(name string) spec.Ref {
+		return spec.MustCreateRef(fmt.Sprintf("#/definitions/%s", friendlyName(name)))
+	}
+	defs := openapi.GetOpenAPIDefinitions(refFunc)
+	schemaDefs := make(map[string]spec.Schema, len(defs))
+	for k, v := range defs {
+		schemaDefs[friendlyName(k)] = v.Schema
+	}
+	data, err := json.Marshal(&spec.Swagger{
+		SwaggerProps: spec.SwaggerProps{
+			Definitions: schemaDefs,
+			Info: &spec.Info{
+				InfoProps: spec.InfoProps{
+					Title:   "Kubernetes",
+					Version: "unversioned",
+				},
+			},
+			Swagger: "2.0",
+		},
+	})
+	if err != nil {
+		return fmt.Errorf("error serializing api definitions: %w", err)
+	}
+	_, err = os.Stdout.Write(data)
+	return nil
+}
+
+// From vendor/k8s.io/apiserver/pkg/endpoints/openapi/openapi.go
+func friendlyName(name string) string {
+	nameParts := strings.Split(name, "/")
+	// Reverse first part. e.g., io.k8s... instead of k8s.io...
+	if len(nameParts) > 0 && strings.Contains(nameParts[0], ".") {
+		parts := strings.Split(nameParts[0], ".")
+		for i, j := 0, len(parts)-1; i < j; i, j = i+1, j-1 {
+			parts[i], parts[j] = parts[j], parts[i]
+		}
+		nameParts[0] = strings.Join(parts, ".")
+	}
+	return strings.Join(nameParts, ".")
+}
--- a/staging/src/k8s.io/apimachinery/pkg/util/managedfields/extract.go
+++ b/staging/src/k8s.io/apimachinery/pkg/util/managedfields/extract.go
@ -0,0 +1,86 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package managedfields
+
+import (
+	"bytes"
+	"fmt"
+
+	"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
+	"sigs.k8s.io/structured-merge-diff/v4/typed"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
+)
+
+// ExtractInto extracts the applied configuration state from object for fieldManager
+// into applyConfiguration. If no managed fields are found for the given fieldManager,
+// no error is returned, but applyConfiguration is left unpopulated. It is possible
+// that no managed fields were found for the fieldManager because other field managers
+// have taken ownership of all the fields previously owned by the fieldManager. It is
+// also possible the fieldManager never owned fields.
+func ExtractInto(object runtime.Object, objectType typed.ParseableType, fieldManager string, applyConfiguration interface{}) error {
+	typedObj, err := toTyped(object, objectType)
+	if err != nil {
+		return fmt.Errorf("error converting obj to typed: %w", err)
+	}
+
+	accessor, err := meta.Accessor(object)
+	if err != nil {
+		return fmt.Errorf("error accessing metadata: %w", err)
+	}
+	fieldsEntry, ok := findManagedFields(accessor, fieldManager)
+	if !ok {
+		return nil
+	}
+	fieldset := &fieldpath.Set{}
+	err = fieldset.FromJSON(bytes.NewReader(fieldsEntry.FieldsV1.Raw))
+	if err != nil {
+		return fmt.Errorf("error marshalling FieldsV1 to JSON: %w", err)
+	}
+
+	u := typedObj.ExtractItems(fieldset.Leaves()).AsValue().Unstructured()
+	m, ok := u.(map[string]interface{})
+	if !ok {
+		return fmt.Errorf("unable to convert managed fields for %s to unstructured, expected map, got %T", fieldManager, u)
+	}
+	if err := runtime.DefaultUnstructuredConverter.FromUnstructured(m, applyConfiguration); err != nil {
+		return fmt.Errorf("error extracting into obj from unstructured: %w", err)
+	}
+	return nil
+}
+
+func findManagedFields(accessor metav1.Object, fieldManager string) (metav1.ManagedFieldsEntry, bool) {
+	objManagedFields := accessor.GetManagedFields()
+	for _, mf := range objManagedFields {
+		if mf.Manager == fieldManager && mf.Operation == metav1.ManagedFieldsOperationApply {
+			return mf, true
+		}
+	}
+	return metav1.ManagedFieldsEntry{}, false
+}
+
+func toTyped(obj runtime.Object, objectType typed.ParseableType) (*typed.TypedValue, error) {
+	switch o := obj.(type) {
+	case *unstructured.Unstructured:
+		return objectType.FromUnstructured(o.Object)
+	default:
+		return objectType.FromStructured(o)
+	}
+}
--- a/staging/src/k8s.io/apimachinery/pkg/util/managedfields/extract_test.go
+++ b/staging/src/k8s.io/apimachinery/pkg/util/managedfields/extract_test.go
@ -0,0 +1,242 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package managedfields
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"sigs.k8s.io/structured-merge-diff/v4/typed"
+
+	"k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
+	runtimeschema "k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func TestExtractInto(t *testing.T) {
+	one := int32(1)
+	parser, err := typed.NewParser(schemaYAML)
+	if err != nil {
+		t.Fatalf("Failed to parse schema: %v", err)
+	}
+	cases := []struct {
+		name          string
+		obj           runtime.Object
+		objType       typed.ParseableType
+		managedFields []metav1.ManagedFieldsEntry // written to object before test is run
+		fieldManager  string
+		expectedOut   interface{}
+	}{
+		{
+			name:    "unstructured, no matching manager",
+			obj:     &unstructured.Unstructured{Object: map[string]interface{}{"spec": map[string]interface{}{"replicas": 1}}},
+			objType: parser.Type("io.k8s.api.apps.v1.Deployment"),
+			managedFields: []metav1.ManagedFieldsEntry{
+				applyFieldsEntry("mgr999", `{ "f:spec": { "f:replicas": {}}}`),
+			},
+			fieldManager: "mgr1",
+			expectedOut:  map[string]interface{}{},
+		},
+		{
+			name:    "unstructured, one manager",
+			obj:     &unstructured.Unstructured{Object: map[string]interface{}{"spec": map[string]interface{}{"replicas": 1}}},
+			objType: parser.Type("io.k8s.api.apps.v1.Deployment"),
+			managedFields: []metav1.ManagedFieldsEntry{
+				applyFieldsEntry("mgr1", `{ "f:spec": { "f:replicas": {}}}`),
+			},
+			fieldManager: "mgr1",
+			expectedOut:  map[string]interface{}{"spec": map[string]interface{}{"replicas": 1}},
+		},
+		{
+			name:    "unstructured, multiple manager",
+			obj:     &unstructured.Unstructured{Object: map[string]interface{}{"spec": map[string]interface{}{"paused": true}}},
+			objType: parser.Type("io.k8s.api.apps.v1.Deployment"),
+			managedFields: []metav1.ManagedFieldsEntry{
+				applyFieldsEntry("mgr1", `{ "f:spec": { "f:replicas": {}}}`),
+				applyFieldsEntry("mgr2", `{ "f:spec": { "f:paused": {}}}`),
+			},
+			fieldManager: "mgr2",
+			expectedOut:  map[string]interface{}{"spec": map[string]interface{}{"paused": true}},
+		},
+		{
+			name:    "structured, no matching manager",
+			obj:     &fakeDeployment{Spec: fakeDeploymentSpec{Replicas: &one}},
+			objType: parser.Type("io.k8s.api.apps.v1.Deployment"),
+			managedFields: []metav1.ManagedFieldsEntry{
+				applyFieldsEntry("mgr999", `{ "f:spec": { "f:replicas": {}}}`),
+			},
+			fieldManager: "mgr1",
+			expectedOut:  map[string]interface{}{},
+		},
+		{
+			name:    "structured, one manager",
+			obj:     &fakeDeployment{Spec: fakeDeploymentSpec{Replicas: &one}},
+			objType: parser.Type("io.k8s.api.apps.v1.Deployment"),
+			managedFields: []metav1.ManagedFieldsEntry{
+				applyFieldsEntry("mgr1", `{ "f:spec": { "f:replicas": {}}}`),
+			},
+			fieldManager: "mgr1",
+			expectedOut:  map[string]interface{}{"spec": map[string]interface{}{"replicas": int64(1)}},
+		},
+		{
+			name:    "structured, multiple manager",
+			obj:     &fakeDeployment{Spec: fakeDeploymentSpec{Replicas: &one, Paused: true}},
+			objType: parser.Type("io.k8s.api.apps.v1.Deployment"),
+			managedFields: []metav1.ManagedFieldsEntry{
+				applyFieldsEntry("mgr1", `{ "f:spec": { "f:replicas": {}}}`),
+				applyFieldsEntry("mgr2", `{ "f:spec": { "f:paused": {}}}`),
+			},
+			fieldManager: "mgr2",
+			expectedOut:  map[string]interface{}{"spec": map[string]interface{}{"paused": true}},
+		},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			out := map[string]interface{}{}
+			accessor, err := meta.Accessor(tc.obj)
+			if err != nil {
+				t.Fatalf("Error accessing object: %v", err)
+			}
+			accessor.SetManagedFields(tc.managedFields)
+			err = ExtractInto(tc.obj, tc.objType, tc.fieldManager, &out)
+			if err != nil {
+				t.Fatalf("Unexpected extract error: %v", err)
+			}
+			if !equality.Semantic.DeepEqual(out, tc.expectedOut) {
+				t.Fatalf("Expected output did not match actual output: %s", cmp.Diff(out, tc.expectedOut))
+			}
+		})
+	}
+}
+
+func applyFieldsEntry(fieldManager string, fieldsJSON string) metav1.ManagedFieldsEntry {
+	return metav1.ManagedFieldsEntry{
+		Manager:    fieldManager,
+		Operation:  metav1.ManagedFieldsOperationApply,
+		APIVersion: "v1",
+		FieldsType: "FieldsV1",
+		FieldsV1:   &metav1.FieldsV1{Raw: []byte(fieldsJSON)},
+	}
+}
+
+type fakeDeployment struct {
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+	Spec              fakeDeploymentSpec `json:"spec"`
+}
+
+type fakeDeploymentSpec struct {
+	Replicas *int32 `json:"replicas"`
+	Paused   bool   `json:"paused,omitempty"`
+}
+
+func (o *fakeDeployment) GetObjectMeta() metav1.ObjectMeta {
+	return o.ObjectMeta
+}
+func (o *fakeDeployment) GetObjectKind() runtimeschema.ObjectKind {
+	return runtimeschema.EmptyObjectKind
+}
+func (o *fakeDeployment) DeepCopyObject() runtime.Object {
+	return o
+}
+
+// trimmed up schema for test purposes
+const schemaYAML = typed.YAMLObject(`types:
+- name: io.k8s.api.apps.v1.Deployment
+  map:
+    fields:
+    - name: apiVersion
+      type:
+        scalar: string
+    - name: kind
+      type:
+        scalar: string
+    - name: metadata
+      type:
+        namedType: io.k8s.apimachinery.pkg.apis.meta.v1.ObjectMeta
+    - name: spec
+      type:
+        namedType: io.k8s.api.apps.v1.DeploymentSpec
+- name: io.k8s.api.apps.v1.DeploymentSpec
+  map:
+    fields:
+    - name: paused
+      type:
+        scalar: boolean
+    - name: replicas
+      type:
+        scalar: numeric
+- name: io.k8s.apimachinery.pkg.apis.meta.v1.ObjectMeta
+  map:
+    fields:
+    - name: creationTimestamp
+      type:
+        namedType: io.k8s.apimachinery.pkg.apis.meta.v1.Time
+    - name: managedFields
+      type:
+        list:
+          elementType:
+            namedType: io.k8s.apimachinery.pkg.apis.meta.v1.ManagedFieldsEntry
+          elementRelationship: atomic
+- name: io.k8s.apimachinery.pkg.apis.meta.v1.ManagedFieldsEntry
+  map:
+    fields:
+    - name: apiVersion
+      type:
+        scalar: string
+    - name: fieldsType
+      type:
+        scalar: string
+    - name: fieldsV1
+      type:
+        namedType: io.k8s.apimachinery.pkg.apis.meta.v1.FieldsV1
+    - name: manager
+      type:
+        scalar: string
+    - name: operation
+      type:
+        scalar: string
+    - name: time
+      type:
+        namedType: io.k8s.apimachinery.pkg.apis.meta.v1.Time
+- name: io.k8s.apimachinery.pkg.apis.meta.v1.FieldsV1
+  map:
+    elementType:
+      scalar: untyped
+      list:
+        elementType:
+          namedType: __untyped_atomic_
+        elementRelationship: atomic
+      map:
+        elementType:
+          namedType: __untyped_atomic_
+        elementRelationship: atomic
+- name: io.k8s.apimachinery.pkg.apis.meta.v1.Time
+  scalar: untyped
+- name: __untyped_atomic_
+  scalar: untyped
+  list:
+    elementType:
+      namedType: __untyped_atomic_
+    elementRelationship: atomic
+  map:
+    elementType:
+      namedType: __untyped_atomic_
+    elementRelationship: atomic
+`)
--- a/staging/src/k8s.io/client-go/go.mod
+++ b/staging/src/k8s.io/client-go/go.mod
@ -31,6 +31,7 @@ require (
 	k8s.io/apimachinery v0.0.0
 	k8s.io/klog/v2 v2.5.0
 	k8s.io/utils v0.0.0-20201110183641-67b214c5f920
+	sigs.k8s.io/structured-merge-diff/v4 v4.1.0
 	sigs.k8s.io/yaml v1.2.0
 )

--- a/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/args/args.go
+++ b/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/args/args.go
@ -40,6 +40,8 @@ type CustomArgs struct {
 	//
 	// meta/v1 types (TypeMeta and ObjectMeta) are always included and do not need to be passed in.
 	ExternalApplyConfigurations map[types.Name]string
+
+	OpenAPISchemaFilePath string
 }

 // NewDefaults returns default arguments for the generator.
@ -65,6 +67,8 @@ func (ca *CustomArgs) AddFlags(fs *pflag.FlagSet, inputBase string) {
 	pflag.Var(NewExternalApplyConfigurationValue(&ca.ExternalApplyConfigurations, nil), "external-applyconfigurations",
 		"list of comma separated external apply configurations locations in <type-package>.<type-name>:<applyconfiguration-package> form."+
 			"For example: k8s.io/api/apps/v1.Deployment:k8s.io/client-go/applyconfigurations/apps/v1")
+	pflag.StringVar(&ca.OpenAPISchemaFilePath, "openapi-schema", "",
+		"path to the openapi schema containing all the types that apply configurations will be generated for")
 }

 // Validate checks the given arguments.
--- a/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/applyconfiguration.go
+++ b/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/applyconfiguration.go
@ -37,6 +37,7 @@ type applyConfigurationGenerator struct {
 	applyConfig   applyConfig
 	imports       namer.ImportTracker
 	refGraph      refGraph
+	openAPIType   *string // if absent, extraction function cannot be generated
 }

 var _ generator.Generator = &applyConfigurationGenerator{}
@ -64,6 +65,9 @@ type TypeParams struct {
 	ApplyConfig applyConfig
 	Tags        util.Tags
 	APIVersion  string
+	ExtractInto *types.Type
+	ParserFunc  *types.Type
+	OpenAPIType *string
 }

 type memberParams struct {
@ -84,6 +88,9 @@ func (g *applyConfigurationGenerator) GenerateType(c *generator.Context, t *type
 		ApplyConfig: g.applyConfig,
 		Tags:        genclientTags(t),
 		APIVersion:  g.groupVersion.ToAPIVersion(),
+		ExtractInto: extractInto,
+		ParserFunc:  types.Ref(g.outputPackage+"/internal", "Parser"),
+		OpenAPIType: g.openAPIType,
 	}

 	g.generateStruct(sw, typeParams)
@ -94,6 +101,9 @@ func (g *applyConfigurationGenerator) GenerateType(c *generator.Context, t *type
 		} else {
 			sw.Do(clientgenTypeConstructorNamespaced, typeParams)
 		}
+		if typeParams.OpenAPIType != nil {
+			g.generateClientgenExtract(sw, typeParams)
+		}
 	} else {
 		sw.Do(constructor, typeParams)
 	}
@ -306,3 +316,35 @@ func $.ApplyConfig.Type|public$() *$.ApplyConfig.ApplyConfiguration|public$ {
  return &$.ApplyConfig.ApplyConfiguration|public${}
 }
 `
+
+func (g *applyConfigurationGenerator) generateClientgenExtract(sw *generator.SnippetWriter, typeParams TypeParams) {
+	sw.Do(`
+// Extract$.ApplyConfig.Type|public$ extracts the applied configuration owned by fieldManager from
+// $.Struct|private$. If no managedFields are found in $.Struct|private$ for fieldManager, a
+// $.ApplyConfig.ApplyConfiguration|public$ is returned with only the Name, Namespace (if applicable),
+// APIVersion and Kind populated. Is is possible that no managed fields were found for because other
+// field managers have taken ownership of all the fields previously owned by fieldManager, or because
+// the fieldManager never owned fields any fields.
+// $.Struct|private$ must be a unmodified $.Struct|public$ API object that was retrieved from the Kubernetes API.
+// Extract$.ApplyConfig.Type|public$ provides a way to perform a extract/modify-in-place/apply workflow.
+// Note that an extracted apply configuration will contain fewer fields than what the fieldManager previously
+// applied if another fieldManager has updated or force applied any of the previously applied fields.
+// Experimental!
+func Extract$.ApplyConfig.Type|public$($.Struct|private$ *$.Struct|raw$, fieldManager string) (*$.ApplyConfig.ApplyConfiguration|public$ , error) {
+	b := &$.ApplyConfig.ApplyConfiguration|public${}
+	err := $.ExtractInto|raw$($.Struct|private$, $.ParserFunc|raw$().Type("$.OpenAPIType$"), fieldManager, b)
+	if err != nil {
+		return nil, err
+	}
+	b.WithName($.Struct|private$.Name)
+`, typeParams)
+	if !typeParams.Tags.NonNamespaced {
+		sw.Do("b.WithNamespace($.Struct|private$.Namespace)\n", typeParams)
+	}
+	sw.Do(`
+	b.WithKind("$.ApplyConfig.Type|singularKind$")
+	b.WithAPIVersion("$.APIVersion$")
+	return b, nil
+}
+`, typeParams)
+}
--- a/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/internal.go
+++ b/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/internal.go
@ -0,0 +1,99 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package generators
+
+import (
+	"io"
+
+	"gopkg.in/yaml.v2"
+
+	"k8s.io/kube-openapi/pkg/schemaconv"
+
+	"k8s.io/gengo/generator"
+	"k8s.io/gengo/namer"
+	"k8s.io/gengo/types"
+)
+
+// utilGenerator generates the ForKind() utility function.
+type internalGenerator struct {
+	generator.DefaultGen
+	outputPackage string
+	imports       namer.ImportTracker
+	typeModels    *typeModels
+	filtered      bool
+}
+
+var _ generator.Generator = &internalGenerator{}
+
+func (g *internalGenerator) Filter(*generator.Context, *types.Type) bool {
+	// generate file exactly once
+	if !g.filtered {
+		g.filtered = true
+		return true
+	}
+	return false
+}
+
+func (g *internalGenerator) Namers(*generator.Context) namer.NameSystems {
+	return namer.NameSystems{
+		"raw":          namer.NewRawNamer(g.outputPackage, g.imports),
+		"singularKind": namer.NewPublicNamer(0),
+	}
+}
+
+func (g *internalGenerator) Imports(*generator.Context) (imports []string) {
+	return g.imports.ImportLines()
+}
+
+func (g *internalGenerator) GenerateType(c *generator.Context, _ *types.Type, w io.Writer) error {
+	sw := generator.NewSnippetWriter(w, c, "{{", "}}")
+
+	schema, err := schemaconv.ToSchema(g.typeModels.models)
+	if err != nil {
+		return err
+	}
+	schemaYAML, err := yaml.Marshal(schema)
+	if err != nil {
+		return err
+	}
+	sw.Do(schemaBlock, map[string]interface{}{
+		"schemaYAML":    string(schemaYAML),
+		"smdParser":     smdParser,
+		"smdNewParser":  smdNewParser,
+		"yamlObject":    yamlObject,
+		"yamlUnmarshal": yamlUnmarshal,
+	})
+
+	return sw.Error()
+}
+
+var schemaBlock = `
+func Parser() *{{.smdParser|raw}} {
+	parserOnce.Do(func() {
+		var err error
+		parser, err = {{.smdNewParser|raw}}(schemaYAML)
+		if err != nil {
+			panic(fmt.Sprintf("Failed to parse schema: %v", err))
+		}
+	})
+	return parser
+}
+
+var parserOnce sync.Once
+var parser *{{.smdParser|raw}}
+var schemaYAML = {{.yamlObject|raw}}(` + "`{{.schemaYAML}}`" + `)
+`
--- a/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/openapi.go
+++ b/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/openapi.go
@ -0,0 +1,204 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package generators
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"strings"
+
+	"github.com/go-openapi/spec"
+	"github.com/googleapis/gnostic/compiler"
+	openapiv2 "github.com/googleapis/gnostic/openapiv2"
+	"gopkg.in/yaml.v2"
+	"k8s.io/gengo/types"
+	utilproto "k8s.io/kube-openapi/pkg/util/proto"
+)
+
+type typeModels struct {
+	models           utilproto.Models
+	gvkToOpenAPIType map[gvk]string
+}
+
+type gvk struct {
+	group, version, kind string
+}
+
+func newTypeModels(openAPISchemaFilePath string, pkgTypes map[string]*types.Package) (*typeModels, error) {
+	if len(openAPISchemaFilePath) == 0 {
+		return emptyModels, nil // No Extract<type>() functions will be generated.
+	}
+
+	rawOpenAPISchema, err := ioutil.ReadFile(openAPISchemaFilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read openapi-schema file: %w", err)
+	}
+
+	// Read in the provided openAPI schema.
+	openAPISchema := &spec.Swagger{}
+	err = json.Unmarshal(rawOpenAPISchema, openAPISchema)
+	if err != nil {
+		return nil, fmt.Errorf("failed to unmarshal typeModels JSON: %w", err)
+	}
+
+	// Build a mapping from openAPI type name to GVK.
+	// Find the root types needed by by client-go for apply.
+	gvkToOpenAPIType := map[gvk]string{}
+	rootDefs := map[string]spec.Schema{}
+	for _, p := range pkgTypes {
+		gv := groupVersion(p)
+		for _, t := range p.Types {
+			tags := genclientTags(t)
+			hasApply := tags.HasVerb("apply") || tags.HasVerb("applyStatus")
+			if tags.GenerateClient && hasApply {
+				openAPIType := friendlyName(typeName(t))
+				gvk := gvk{
+					group:   gv.Group.String(),
+					version: gv.Version.String(),
+					kind:    t.Name.Name,
+				}
+				rootDefs[openAPIType] = openAPISchema.Definitions[openAPIType]
+				gvkToOpenAPIType[gvk] = openAPIType
+			}
+		}
+	}
+
+	// Trim the schema down to just the types needed by client-go for apply.
+	requiredDefs := make(map[string]spec.Schema)
+	for name, def := range rootDefs {
+		requiredDefs[name] = def
+		findReferenced(&def, openAPISchema.Definitions, requiredDefs)
+	}
+	openAPISchema.Definitions = requiredDefs
+
+	// Convert the openAPI schema to the models format and validate it.
+	models, err := toValidatedModels(openAPISchema)
+	if err != nil {
+		return nil, err
+	}
+	return &typeModels{models: models, gvkToOpenAPIType: gvkToOpenAPIType}, nil
+}
+
+var emptyModels = &typeModels{
+	models:           &utilproto.Definitions{},
+	gvkToOpenAPIType: map[gvk]string{},
+}
+
+func toValidatedModels(openAPISchema *spec.Swagger) (utilproto.Models, error) {
+	// openapi_v2.NewDocument only accepts a yaml.MapSlice
+	// so we do an inefficient marshal back to json and then read it back in as yaml
+	// but get the benefit of running the models through utilproto.NewOpenAPIData to
+	// validate all the references between types
+	rawMinimalOpenAPISchema, err := json.Marshal(openAPISchema)
+	if err != nil {
+		return nil, fmt.Errorf("failed to unmarshal openAPI as JSON: %w", err)
+	}
+	var info yaml.MapSlice
+	err = yaml.Unmarshal(rawMinimalOpenAPISchema, &info)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse OpenAPI file: %w", err)
+	}
+	document, err := openapiv2.NewDocument(info, compiler.NewContext("$root", nil))
+	if err != nil {
+		return nil, fmt.Errorf("failed to OpenAPI document for file: %w", err)
+	}
+	// Construct the models and validate all references are valid.
+	models, err := utilproto.NewOpenAPIData(document)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create OpenAPI models for file: %w", err)
+	}
+	return models, nil
+}
+
+// findReferenced recursively finds all schemas referenced from the given def.
+// toValidatedModels makes sure no references get missed.
+func findReferenced(def *spec.Schema, allSchemas, referencedOut map[string]spec.Schema) {
+	// follow $ref, if any
+	refPtr := def.Ref.GetPointer()
+	if refPtr != nil && !refPtr.IsEmpty() {
+		name := refPtr.String()
+		if !strings.HasPrefix(name, "/definitions/") {
+			return
+		}
+		name = strings.TrimPrefix(name, "/definitions/")
+		schema, ok := allSchemas[name]
+		if !ok {
+			panic(fmt.Sprintf("allSchemas schema is missing referenced type: %s", name))
+		}
+		if _, ok := referencedOut[name]; !ok {
+			referencedOut[name] = schema
+			findReferenced(&schema, allSchemas, referencedOut)
+		}
+	}
+
+	// follow any nested schemas
+	if def.Items != nil {
+		if def.Items.Schema != nil {
+			findReferenced(def.Items.Schema, allSchemas, referencedOut)
+		}
+		for _, item := range def.Items.Schemas {
+			findReferenced(&item, allSchemas, referencedOut)
+		}
+	}
+	if def.AllOf != nil {
+		for _, s := range def.AllOf {
+			findReferenced(&s, allSchemas, referencedOut)
+		}
+	}
+	if def.AnyOf != nil {
+		for _, s := range def.AnyOf {
+			findReferenced(&s, allSchemas, referencedOut)
+		}
+	}
+	if def.OneOf != nil {
+		for _, s := range def.OneOf {
+			findReferenced(&s, allSchemas, referencedOut)
+		}
+	}
+	if def.Not != nil {
+		findReferenced(def.Not, allSchemas, referencedOut)
+	}
+	if def.Properties != nil {
+		for _, prop := range def.Properties {
+			findReferenced(&prop, allSchemas, referencedOut)
+		}
+	}
+	if def.AdditionalProperties != nil && def.AdditionalProperties.Schema != nil {
+		findReferenced(def.AdditionalProperties.Schema, allSchemas, referencedOut)
+	}
+	if def.PatternProperties != nil {
+		for _, s := range def.PatternProperties {
+			findReferenced(&s, allSchemas, referencedOut)
+		}
+	}
+	if def.Dependencies != nil {
+		for _, d := range def.Dependencies {
+			if d.Schema != nil {
+				findReferenced(d.Schema, allSchemas, referencedOut)
+			}
+		}
+	}
+	if def.AdditionalItems != nil && def.AdditionalItems.Schema != nil {
+		findReferenced(def.AdditionalItems.Schema, allSchemas, referencedOut)
+	}
+	if def.Definitions != nil {
+		for _, s := range def.Definitions {
+			findReferenced(&s, allSchemas, referencedOut)
+		}
+	}
+}
--- a/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/packages.go
+++ b/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/packages.go
@ -17,6 +17,7 @@ limitations under the License.
 package generators

 import (
+	"fmt"
 	"path"
 	"path/filepath"
 	"sort"
@ -60,9 +61,13 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 	}

 	pkgTypes := packageTypesForInputDirs(context, arguments.InputDirs, arguments.OutputPackagePath)
-	initialTypes := arguments.CustomArgs.(*applygenargs.CustomArgs).ExternalApplyConfigurations
+	customArgs := arguments.CustomArgs.(*applygenargs.CustomArgs)
+	initialTypes := customArgs.ExternalApplyConfigurations
 	refs := refGraphForReachableTypes(pkgTypes, initialTypes)
-
+	typeModels, err := newTypeModels(customArgs.OpenAPISchemaFilePath, pkgTypes)
+	if err != nil {
+		klog.Fatalf("Failed build type models from typeModels %s: %v", customArgs.OpenAPISchemaFilePath, err)
+	}
 	groupVersions := make(map[string]clientgentypes.GroupVersions)
 	groupGoNames := make(map[string]string)
 	applyConfigsForGroupVersion := make(map[clientgentypes.GroupVersion][]applyConfig)
@ -88,7 +93,7 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 		sort.Sort(applyConfigSort(toGenerate))

 		// generate the apply configurations
-		packageList = append(packageList, generatorForApplyConfigurationsPackage(arguments.OutputPackagePath, boilerplate, pkgType, gv, toGenerate, refs))
+		packageList = append(packageList, generatorForApplyConfigurationsPackage(arguments.OutputPackagePath, boilerplate, pkgType, gv, toGenerate, refs, typeModels))

 		// group all the generated apply configurations by gv so ForKind() can be generated
 		groupPackageName := gv.Group.NonEmpty()
@ -111,17 +116,50 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat

 	// generate ForKind() utility function
 	packageList = append(packageList, generatorForUtils(arguments.OutputPackagePath, boilerplate, groupVersions, applyConfigsForGroupVersion, groupGoNames))
+	// generate internal embedded schema, required for generated Extract functions
+	packageList = append(packageList, generatorForInternal(filepath.Join(arguments.OutputPackagePath, "internal"), boilerplate, typeModels))

 	return packageList
 }

-func generatorForApplyConfigurationsPackage(outputPackagePath string, boilerplate []byte, packageName types.Name, gv clientgentypes.GroupVersion, typesToGenerate []applyConfig, refs refGraph) *generator.DefaultPackage {
+func friendlyName(name string) string {
+	nameParts := strings.Split(name, "/")
+	// Reverse first part. e.g., io.k8s... instead of k8s.io...
+	if len(nameParts) > 0 && strings.Contains(nameParts[0], ".") {
+		parts := strings.Split(nameParts[0], ".")
+		for i, j := 0, len(parts)-1; i < j; i, j = i+1, j-1 {
+			parts[i], parts[j] = parts[j], parts[i]
+		}
+		nameParts[0] = strings.Join(parts, ".")
+	}
+	return strings.Join(nameParts, ".")
+}
+
+func typeName(t *types.Type) string {
+	typePackage := t.Name.Package
+	if strings.Contains(typePackage, "/vendor/") {
+		typePackage = typePackage[strings.Index(typePackage, "/vendor/")+len("/vendor/"):]
+	}
+	return fmt.Sprintf("%s.%s", typePackage, t.Name.Name)
+}
+
+func generatorForApplyConfigurationsPackage(outputPackagePath string, boilerplate []byte, packageName types.Name, gv clientgentypes.GroupVersion, typesToGenerate []applyConfig, refs refGraph, models *typeModels) *generator.DefaultPackage {
 	return &generator.DefaultPackage{
 		PackageName: gv.Version.PackageName(),
 		PackagePath: packageName.Package,
 		HeaderText:  boilerplate,
 		GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
 			for _, toGenerate := range typesToGenerate {
+				var openAPIType *string
+				gvk := gvk{
+					group:   gv.Group.String(),
+					version: gv.Version.String(),
+					kind:    toGenerate.Type.Name.Name,
+				}
+				if v, ok := models.gvkToOpenAPIType[gvk]; ok {
+					openAPIType = &v
+				}
+
 				generators = append(generators, &applyConfigurationGenerator{
 					DefaultGen: generator.DefaultGen{
 						OptionalName: strings.ToLower(toGenerate.Type.Name.Name),
@ -132,6 +170,7 @@ func generatorForApplyConfigurationsPackage(outputPackagePath string, boilerplat
 					applyConfig:   toGenerate,
 					imports:       generator.NewImportTracker(),
 					refGraph:      refs,
+					openAPIType:   openAPIType,
 				})
 			}
 			return generators
@ -160,6 +199,25 @@ func generatorForUtils(outPackagePath string, boilerplate []byte, groupVersions
 	}
 }

+func generatorForInternal(outPackagePath string, boilerplate []byte, models *typeModels) *generator.DefaultPackage {
+	return &generator.DefaultPackage{
+		PackageName: filepath.Base(outPackagePath),
+		PackagePath: outPackagePath,
+		HeaderText:  boilerplate,
+		GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
+			generators = append(generators, &internalGenerator{
+				DefaultGen: generator.DefaultGen{
+					OptionalName: "internal",
+				},
+				outputPackage: outPackagePath,
+				imports:       generator.NewImportTracker(),
+				typeModels:    models,
+			})
+			return generators
+		},
+	}
+}
+
 func goName(gv clientgentypes.GroupVersion, p *types.Package) string {
 	goName := namer.IC(strings.Split(gv.Group.NonEmpty(), ".")[0])
 	if override := types.ExtractCommentTags("+", p.Comments)["groupGoName"]; override != nil {
--- a/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/types.go
+++ b/staging/src/k8s.io/code-generator/cmd/applyconfiguration-gen/generators/types.go
@ -24,4 +24,9 @@ var (
 	objectMeta         = types.Ref("k8s.io/apimachinery/pkg/apis/meta/v1", "ObjectMeta")
 	rawExtension       = types.Ref("k8s.io/apimachinery/pkg/runtime", "RawExtension")
 	unknown            = types.Ref("k8s.io/apimachinery/pkg/runtime", "Unknown")
+	extractInto        = types.Ref("k8s.io/apimachinery/pkg/util/managedfields", "ExtractInto")
+	smdNewParser       = types.Ref("sigs.k8s.io/structured-merge-diff/v4/typed", "NewParser")
+	smdParser          = types.Ref("sigs.k8s.io/structured-merge-diff/v4/typed", "Parser")
+	yamlObject         = types.Ref("sigs.k8s.io/structured-merge-diff/v4/typed", "YAMLObject")
+	yamlUnmarshal      = types.Ref("gopkg.in/yaml.v2", "Unmarshal")
 )
--- a/staging/src/k8s.io/code-generator/examples/go.sum
+++ b/staging/src/k8s.io/code-generator/examples/go.sum
@ -435,7 +435,7 @@ rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
-sigs.k8s.io/structured-merge-diff/v4 v4.0.3 h1:4oyYo8NREp49LBBhKxEqCulFjg26rawYKrnCmg+Sr6c=
-sigs.k8s.io/structured-merge-diff/v4 v4.0.3/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0 h1:C4r9BgJ98vrKnnVCjwCSXcWjWe0NKcUQkmzDXZXGwH8=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
--- a/staging/src/k8s.io/code-generator/go.mod
+++ b/staging/src/k8s.io/code-generator/go.mod
@ -6,13 +6,17 @@ go 1.16

 require (
 	github.com/emicklei/go-restful v2.9.5+incompatible // indirect
-	github.com/go-openapi/spec v0.19.5 // indirect
+	github.com/go-openapi/spec v0.19.5
 	github.com/gogo/protobuf v1.3.2
+	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/google/go-cmp v0.5.2 // indirect
+	github.com/googleapis/gnostic v0.4.1
 	github.com/json-iterator/go v1.1.10 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/mailru/easyjson v0.7.0 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
+	github.com/onsi/ginkgo v1.11.0 // indirect
+	github.com/onsi/gomega v1.7.0 // indirect
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.6.1 // indirect
 	golang.org/x/mod v0.3.1-0.20200828183125-ce943fd02449 // indirect
@ -20,11 +24,13 @@ require (
 	golang.org/x/sys v0.0.0-20210225134936-a50acf3fe073 // indirect
 	golang.org/x/text v0.3.4 // indirect
 	golang.org/x/tools v0.1.0 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027
 	k8s.io/klog/v2 v2.5.0
 	k8s.io/kube-openapi v0.0.0-20210305001622-591a79e4bda7
+	sigs.k8s.io/structured-merge-diff/v4 v4.1.0 // indirect
 )

 replace k8s.io/code-generator => ../code-generator
--- a/staging/src/k8s.io/code-generator/go.sum
+++ b/staging/src/k8s.io/code-generator/go.sum
@ -1,9 +1,13 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tNFfI=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@ -12,6 +16,9 @@ github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/emicklei/go-restful v2.9.5+incompatible h1:spTtZBk5DYEvbxMVutUuTyh1Ao2r4iyvLdACqsl/Ljk=
 github.com/emicklei/go-restful v2.9.5+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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 github.com/go-logr/logr v0.2.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
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@ -30,14 +37,34 @@ github.com/go-openapi/swag v0.19.5 h1:lTz6Ys4CmqqCQmZPBlbQENR1/GucA2bzYTE12Pw4tF
 github.com/go-openapi/swag v0.19.5/go.mod h1:POnQmlKehdgb5mhVOsnJFsivZCEZ/vjK9gh66Z9tfKk=
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@ -65,9 +92,15 @@ github.com/munnerz/goautoneg v0.0.0-20120707110453-a547fc61f48d/go.mod h1:+n7T8m
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/onsi/ginkgo v0.0.0-20170829012221-11459a886d9c/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
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@ -82,10 +115,18 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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@ -96,9 +137,14 @@ golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210224082022-3d97a244fca7 h1:OgUuv8lsRpBibGNbSizVwKWlysjaNzmC9gYMhPVfqFM=
 golang.org/x/net v0.0.0-20210224082022-3d97a244fca7/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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@ -115,6 +161,10 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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@ -127,11 +177,33 @@ golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8T
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 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@ -140,6 +212,8 @@ gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027 h1:Uusb3oh8XcdzDF/ndlI4ToKTYVlkCSJP39SRY2mfRAw=
 k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
@ -150,5 +224,7 @@ k8s.io/klog/v2 v2.5.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
 k8s.io/kube-openapi v0.0.0-20210305001622-591a79e4bda7 h1:vEx13qjvaZ4yfObSSXW7BrMc/KQBBT/Jyee8XtLf4x0=
 k8s.io/kube-openapi v0.0.0-20210305001622-591a79e4bda7/go.mod h1:wXW5VT87nVfh/iLV8FpR2uDvrFyomxbtb1KivDbvPTE=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0 h1:C4r9BgJ98vrKnnVCjwCSXcWjWe0NKcUQkmzDXZXGwH8=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
--- a/test/integration/client/client_test.go
+++ b/test/integration/client/client_test.go
@ -26,8 +26,10 @@ import (
 	"testing"
 	"time"

+	"github.com/google/go-cmp/cmp"
 	appsv1 "k8s.io/api/apps/v1"
 	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/equality"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@ -882,3 +884,302 @@ func TestApplyWithApplyConfiguration(t *testing.T) {
 		t.Error("expected status to contain DeploymentReplicaFailure condition set by apply")
 	}
 }
+
+func TestExtractModifyApply(t *testing.T) {
+	testCases := []struct {
+		name string
+		// modifyFunc modifies deployApply, defined below, after it is applied and "extracted"
+		// apply is skipped if this func is nil
+		modifyFunc       func(apply *appsv1ac.DeploymentApplyConfiguration)
+		modifyStatusFunc func(apply *appsv1ac.DeploymentApplyConfiguration) // same but for status
+		// verifyAppliedFunc verifies the results of applying the applied
+		// configuration after modifyFunc modifies it. Only called if modifyFunc is provided.
+		verifyAppliedFunc       func(applied *appsv1ac.DeploymentApplyConfiguration)
+		verifyStatusAppliedFunc func(applied *appsv1ac.DeploymentApplyConfiguration) // same but for status
+	}{
+		{
+			// With<fieldname>() on a scalar field replaces it with the given value
+			name: "modify-scalar",
+			modifyFunc: func(apply *appsv1ac.DeploymentApplyConfiguration) {
+				apply.Spec.WithReplicas(2)
+			},
+			verifyAppliedFunc: func(applied *appsv1ac.DeploymentApplyConfiguration) {
+				if *applied.Spec.Replicas != 2 {
+					t.Errorf("Expected 2 replicas but got: %d", *applied.Spec.Replicas)
+				}
+			},
+		},
+		{
+			// With<fieldname>() on a non-empty struct field replaces the entire struct
+			name: "modify-struct",
+			modifyFunc: func(apply *appsv1ac.DeploymentApplyConfiguration) {
+				apply.Spec.Template.WithSpec(corev1ac.PodSpec(). // replace the Spec of the existing Template
+											WithContainers(
+						corev1ac.Container().
+							WithName("modify-struct").
+							WithImage("nginx:1.14.3"),
+					),
+				)
+			},
+			verifyAppliedFunc: func(applied *appsv1ac.DeploymentApplyConfiguration) {
+				containers := applied.Spec.Template.Spec.Containers
+				if len(containers) != 1 {
+					t.Errorf("Expected 1 container but got %d", len(containers))
+				}
+				if *containers[0].Name != "modify-struct" {
+					t.Errorf("Expected container name modify-struct but got: %s", *containers[0].Name)
+				}
+			},
+		},
+		{
+			// With<fieldname>() on a non-empty map field puts all the given entries into the existing map
+			name: "modify-map",
+			modifyFunc: func(apply *appsv1ac.DeploymentApplyConfiguration) {
+				apply.WithLabels(map[string]string{"label2": "value2"})
+			},
+			verifyAppliedFunc: func(applied *appsv1ac.DeploymentApplyConfiguration) {
+				labels := applied.Labels
+				if len(labels) != 2 {
+					t.Errorf("Expected 2 label but got %d", len(labels))
+				}
+				if labels["label2"] != "value2" {
+					t.Errorf("Expected container name value2 but got: %s", labels["label2"])
+				}
+			},
+		},
+		{
+			// With<fieldname>() on a non-empty slice field appends all the given items to the existing slice
+			name: "modify-slice",
+			modifyFunc: func(apply *appsv1ac.DeploymentApplyConfiguration) {
+				apply.Spec.Template.Spec.WithContainers(corev1ac.Container().
+					WithName("modify-slice").
+					WithImage("nginx:1.14.2"),
+				)
+			},
+			verifyAppliedFunc: func(applied *appsv1ac.DeploymentApplyConfiguration) {
+				containers := applied.Spec.Template.Spec.Containers
+				if len(containers) != 2 {
+					t.Errorf("Expected 2 containers but got %d", len(containers))
+				}
+				if *containers[0].Name != "initial-container" {
+					t.Errorf("Expected container name initial-container but got: %s", *containers[0].Name)
+				}
+				if *containers[1].Name != "modify-slice" {
+					t.Errorf("Expected container name modify-slice but got: %s", *containers[1].Name)
+				}
+			},
+		},
+		{
+			// Append a condition to the status if the object
+			name: "modify-status-conditions",
+			modifyStatusFunc: func(apply *appsv1ac.DeploymentApplyConfiguration) {
+				apply.WithStatus(appsv1ac.DeploymentStatus().
+					WithConditions(appsv1ac.DeploymentCondition().
+						WithType(appsv1.DeploymentProgressing).
+						WithStatus(v1.ConditionUnknown).
+						WithLastTransitionTime(metav1.Now()).
+						WithLastUpdateTime(metav1.Now()).
+						WithMessage("progressing").
+						WithReason("TestExtractModifyApply_Status"),
+					),
+				)
+			},
+			verifyStatusAppliedFunc: func(applied *appsv1ac.DeploymentApplyConfiguration) {
+				conditions := applied.Status.Conditions
+				if len(conditions) != 1 {
+					t.Errorf("Expected 1 conditions but got %d", len(conditions))
+				}
+				if *conditions[0].Type != appsv1.DeploymentProgressing {
+					t.Errorf("Expected condition name DeploymentProgressing but got: %s", *conditions[0].Type)
+				}
+			},
+		},
+	}
+
+	testServer := kubeapiservertesting.StartTestServerOrDie(t, nil, []string{"--disable-admission-plugins", "ServiceAccount"}, framework.SharedEtcd())
+	defer testServer.TearDownFn()
+	c := clientset.NewForConfigOrDie(testServer.ClientConfig)
+	deploymentClient := c.AppsV1().Deployments("default")
+	fieldMgr := "test-mgr"
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			// Applied at the started of each test
+			deployApply := appsv1ac.Deployment(tc.name, "default").
+				WithLabels(map[string]string{"label1": "value1"}).
+				WithSpec(appsv1ac.DeploymentSpec().
+					WithSelector(metav1ac.LabelSelector().
+						WithMatchLabels(map[string]string{"app": tc.name}),
+					).
+					WithTemplate(corev1ac.PodTemplateSpec().
+						WithLabels(map[string]string{"app": tc.name}).
+						WithSpec(corev1ac.PodSpec().
+							WithContainers(
+								corev1ac.Container().
+									WithName("initial-container").
+									WithImage("nginx:1.14.2"),
+							),
+						),
+					),
+				)
+			actual, err := deploymentClient.Apply(context.TODO(), deployApply, metav1.ApplyOptions{FieldManager: fieldMgr})
+			if err != nil {
+				t.Fatalf("Failed to apply: %v", err)
+			}
+
+			extractedDeployment, err := appsv1ac.ExtractDeployment(actual, fieldMgr)
+			if err != nil {
+				t.Fatalf("Failed to extract: %v", err)
+			}
+
+			if tc.modifyFunc != nil {
+				tc.modifyFunc(extractedDeployment)
+				result, err := deploymentClient.Apply(context.TODO(), extractedDeployment, metav1.ApplyOptions{FieldManager: fieldMgr})
+				if err != nil {
+					t.Fatalf("Failed to apply extracted apply configuration: %v", err)
+				}
+				extractedResult, err := appsv1ac.ExtractDeployment(result, fieldMgr)
+				if err != nil {
+					t.Fatalf("Failed to extract: %v", err)
+				}
+				if tc.verifyAppliedFunc != nil {
+					tc.verifyAppliedFunc(extractedResult)
+				}
+			}
+
+			if tc.modifyStatusFunc != nil {
+				tc.modifyStatusFunc(extractedDeployment)
+				result, err := deploymentClient.ApplyStatus(context.TODO(), extractedDeployment, metav1.ApplyOptions{FieldManager: fieldMgr})
+				if err != nil {
+					t.Fatalf("Failed to apply extracted apply configuration to status: %v", err)
+				}
+				extractedResult, err := appsv1ac.ExtractDeployment(result, fieldMgr)
+				if err != nil {
+					t.Fatalf("Failed to extract: %v", err)
+				}
+				if tc.verifyStatusAppliedFunc != nil {
+					tc.verifyStatusAppliedFunc(extractedResult)
+				}
+			}
+		})
+	}
+}
+
+func TestExtractModifyApply_ForceOwnership(t *testing.T) {
+	testServer := kubeapiservertesting.StartTestServerOrDie(t, nil, []string{"--disable-admission-plugins", "ServiceAccount"}, framework.SharedEtcd())
+	defer testServer.TearDownFn()
+	c := clientset.NewForConfigOrDie(testServer.ClientConfig)
+	deploymentClient := c.AppsV1().Deployments("default")
+
+	// apply an initial state with one field manager
+	createApply := appsv1ac.Deployment("nginx-apply", "default").
+		WithSpec(appsv1ac.DeploymentSpec().
+			WithSelector(metav1ac.LabelSelector().
+				WithMatchLabels(map[string]string{"app": "nginx"}),
+			).
+			WithTemplate(corev1ac.PodTemplateSpec().
+				WithLabels(map[string]string{"app": "nginx"}).
+				WithSpec(corev1ac.PodSpec().
+					WithContainers(
+						corev1ac.Container().
+							WithName("nginx").
+							WithImage("nginx:1.14.2").
+							WithWorkingDir("/tmp/v1"),
+					),
+				),
+			),
+		)
+
+	_, err := deploymentClient.Apply(context.TODO(), createApply, metav1.ApplyOptions{FieldManager: "create-mgr", Force: true})
+	if err != nil {
+		t.Fatalf("Error creating createApply: %v", err)
+	}
+
+	// apply some non-overlapping fields with another field manager
+	sidecarApply := appsv1ac.Deployment("nginx-apply", "default").
+		WithSpec(appsv1ac.DeploymentSpec().
+			WithTemplate(corev1ac.PodTemplateSpec().
+				WithSpec(corev1ac.PodSpec().
+					WithContainers(
+						corev1ac.Container().
+							WithName("sidecar").
+							WithImage("nginx:1.14.2"),
+					),
+				),
+			),
+		)
+
+	applied, err := deploymentClient.Apply(context.TODO(), sidecarApply, metav1.ApplyOptions{FieldManager: "sidecar-mgr", Force: true})
+	if err != nil {
+		t.Fatalf("Error applying createApply: %v", err)
+	}
+	sidecarExtracted, err := appsv1ac.ExtractDeployment(applied, "sidecar-mgr")
+	if err != nil {
+		t.Fatalf("Error extracting createApply apply configuration: %v", err)
+	}
+	if !equality.Semantic.DeepEqual(sidecarApply, sidecarExtracted) {
+		t.Errorf("Expected sidecarExtracted apply configuration to match original, but got:\n%s\n", cmp.Diff(sidecarApply, sidecarExtracted))
+	}
+
+	// modify the extracted apply configuration that was just applied and add some fields that overlap
+	// with the fields owned by the other field manager to force ownership of them
+	sidecarExtracted.Spec.Template.Spec.Containers[0].WithImage("nginx:1.14.3")
+	sidecarExtracted.Spec.Template.Spec.WithContainers(corev1ac.Container().
+		WithName("nginx").
+		WithWorkingDir("/tmp/v2"),
+	)
+	reapplied, err := deploymentClient.Apply(context.TODO(), sidecarExtracted, metav1.ApplyOptions{FieldManager: "sidecar-mgr", Force: true})
+	if err != nil {
+		t.Fatalf("Unexpected error when applying manifest for Deployment: %v", err)
+	}
+
+	// extract apply configurations for both field managers and check that they are what we expect
+	reappliedExtracted, err := appsv1ac.ExtractDeployment(reapplied, "sidecar-mgr")
+	if err != nil {
+		t.Fatalf("Error extracting sidecarExtracted apply configuration: %v", err)
+	}
+
+	expectedReappliedExtracted := appsv1ac.Deployment("nginx-apply", "default").
+		WithSpec(appsv1ac.DeploymentSpec().
+			WithTemplate(corev1ac.PodTemplateSpec().
+				WithSpec(corev1ac.PodSpec().
+					WithContainers(
+						corev1ac.Container().
+							WithName("nginx").
+							WithWorkingDir("/tmp/v2"),
+						corev1ac.Container().
+							WithName("sidecar").
+							WithImage("nginx:1.14.3"),
+					),
+				),
+			),
+		)
+	if !equality.Semantic.DeepEqual(expectedReappliedExtracted, reappliedExtracted) {
+		t.Errorf("Reapplied apply configuration did not match expected, got:\n%s\n", cmp.Diff(expectedReappliedExtracted, reappliedExtracted))
+	}
+
+	createMgrExtracted, err := appsv1ac.ExtractDeployment(reapplied, "create-mgr")
+	if err != nil {
+		t.Fatalf("Error extracting createApply apply configuration: %v", err)
+	}
+
+	expectedCreateExtracted := appsv1ac.Deployment("nginx-apply", "default").
+		WithSpec(appsv1ac.DeploymentSpec().
+			WithSelector(metav1ac.LabelSelector().
+				WithMatchLabels(map[string]string{"app": "nginx"}),
+			).
+			WithTemplate(corev1ac.PodTemplateSpec().
+				WithLabels(map[string]string{"app": "nginx"}).
+				WithSpec(corev1ac.PodSpec().
+					WithContainers(
+						corev1ac.Container().
+							WithName("nginx").
+							WithImage("nginx:1.14.2"),
+					),
+				),
+			),
+		)
+	if !equality.Semantic.DeepEqual(expectedCreateExtracted, createMgrExtracted) {
+		t.Errorf("createMgrExtracted apply configuration did not match expected, got:\n%s\n", cmp.Diff(expectedCreateExtracted, createMgrExtracted))
+	}
+}
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@ -1722,6 +1722,7 @@ k8s.io/apimachinery/pkg/util/httpstream/spdy
 k8s.io/apimachinery/pkg/util/intstr
 k8s.io/apimachinery/pkg/util/json
 k8s.io/apimachinery/pkg/util/jsonmergepatch
+k8s.io/apimachinery/pkg/util/managedfields
 k8s.io/apimachinery/pkg/util/mergepatch
 k8s.io/apimachinery/pkg/util/naming
 k8s.io/apimachinery/pkg/util/net
@ -1927,6 +1928,7 @@ k8s.io/client-go/applyconfigurations/extensions/v1beta1
 k8s.io/client-go/applyconfigurations/flowcontrol/v1alpha1
 k8s.io/client-go/applyconfigurations/flowcontrol/v1beta1
 k8s.io/client-go/applyconfigurations/imagepolicy/v1alpha1
+k8s.io/client-go/applyconfigurations/internal
 k8s.io/client-go/applyconfigurations/meta/v1
 k8s.io/client-go/applyconfigurations/networking/v1
 k8s.io/client-go/applyconfigurations/networking/v1beta1