Add "fieldManager" to flag to PATCH/CREATE/UPDATE

And add a corresponding flag in kubectl (for apply), even though the
value is defaulted in kubectl with "kubectl".

The flag is required for Apply patch-type, and optional for other PATCH,
CREATE and UPDATE (in which case we fallback on the user-agent).

pkg/kubectl/cmd/apply/apply.go

@@ -68,6 +68,7 @@ type ApplyOptions struct {
 
 	ServerSideApply bool
 	ForceConflicts  bool
+	FieldManager    string
 	Selector        string
 	DryRun          bool
 	ServerDryRun    bool
@@ -196,14 +197,15 @@ func NewCmdApply(baseName string, f cmdutil.Factory, ioStreams genericclioptions
 func (o *ApplyOptions) Complete(f cmdutil.Factory, cmd *cobra.Command) error {
 	o.ServerSideApply = cmdutil.GetServerSideApplyFlag(cmd)
 	o.ForceConflicts = cmdutil.GetForceConflictsFlag(cmd)
+	o.FieldManager = cmdutil.GetFieldManagerFlag(cmd)
 	o.DryRun = cmdutil.GetDryRunFlag(cmd)
 
 	if o.ForceConflicts && !o.ServerSideApply {
-		return fmt.Errorf("--force-conflicts only works with --server-side")
+		return fmt.Errorf("--experimental-force-conflicts only works with --experimental-server-side")
 	}
 
 	if o.DryRun && o.ServerSideApply {
-		return fmt.Errorf("--dry-run doesn't work with --server-side")
+		return fmt.Errorf("--dry-run doesn't work with --experimental-server-side (did you mean --server-dry-run instead?)")
 	}
 
 	if o.DryRun && o.ServerDryRun {
@@ -394,6 +396,7 @@ func (o *ApplyOptions) Run() error {
 			}
 			options := metav1.PatchOptions{
 				Force:        &o.ForceConflicts,
+				FieldManager: o.FieldManager,
 			}
 			if o.ServerDryRun {
 				options.DryRun = []string{metav1.DryRunAll}

pkg/kubectl/cmd/diff/diff.go

@@ -402,7 +402,7 @@ func (o *DiffOptions) Complete(f cmdutil.Factory, cmd *cobra.Command) error {
 	o.ServerSideApply = cmdutil.GetServerSideApplyFlag(cmd)
 	o.ForceConflicts = cmdutil.GetForceConflictsFlag(cmd)
 	if o.ForceConflicts && !o.ServerSideApply {
-		return fmt.Errorf("--force-conflicts only works with --server-side")
+		return fmt.Errorf("--experimental-force-conflicts only works with --experimental-server-side")
 	}
 
 	if !o.ServerSideApply {

pkg/kubectl/cmd/util/helpers.go

@@ -406,8 +406,9 @@ func AddDryRunFlag(cmd *cobra.Command) {
 }
 
 func AddServerSideApplyFlags(cmd *cobra.Command) {
-	cmd.Flags().Bool("server-side", false, "If true, apply runs in the server instead of the client. This is an alpha feature and flag.")
+	cmd.Flags().Bool("experimental-server-side", false, "If true, apply runs in the server instead of the client. This is an alpha feature and flag.")
-	cmd.Flags().Bool("force-conflicts", false, "If true, server-side apply will force the changes against conflicts. This is an alpha feature and flag.")
+	cmd.Flags().Bool("experimental-force-conflicts", false, "If true, server-side apply will force the changes against conflicts. This is an alpha feature and flag.")
+	cmd.Flags().String("experimental-field-manager", "kubectl", "Name of the manager used to track field ownership. This is an alpha feature and flag.")
 }
 
 func AddIncludeUninitializedFlag(cmd *cobra.Command) {
@@ -484,11 +485,15 @@ func DumpReaderToFile(reader io.Reader, filename string) error {
 }
 
 func GetServerSideApplyFlag(cmd *cobra.Command) bool {
-	return GetFlagBool(cmd, "server-side")
+	return GetFlagBool(cmd, "experimental-server-side")
 }
 
 func GetForceConflictsFlag(cmd *cobra.Command) bool {
-	return GetFlagBool(cmd, "force-conflicts")
+	return GetFlagBool(cmd, "experimental-force-conflicts")
+}
+
+func GetFieldManagerFlag(cmd *cobra.Command) string {
+	return GetFlagString(cmd, "experimental-field-manager")
 }
 
 func GetDryRunFlag(cmd *cobra.Command) bool {

staging/src/k8s.io/apiextensions-apiserver/test/integration/apply_test.go

@@ -71,6 +71,7 @@ values:
 	result, err := rest.Patch(types.ApplyPatchType).
 		AbsPath("/apis", noxuDefinition.Spec.Group, noxuDefinition.Spec.Version, noxuDefinition.Spec.Names.Plural).
 		Name("mytest").
+		Param("fieldManager", "apply_test").
 		Body(yamlBody).
 		DoRaw()
 	if err != nil {
@@ -90,6 +91,7 @@ values:
 	result, err = rest.Patch(types.ApplyPatchType).
 		AbsPath("/apis", noxuDefinition.Spec.Group, noxuDefinition.Spec.Version, noxuDefinition.Spec.Names.Plural).
 		Name("mytest").
+		Param("fieldManager", "apply_test").
 		Body(yamlBody).
 		DoRaw()
 	if err == nil {
@@ -108,6 +110,7 @@ values:
 		AbsPath("/apis", noxuDefinition.Spec.Group, noxuDefinition.Spec.Version, noxuDefinition.Spec.Names.Plural).
 		Name("mytest").
 		Param("force", "true").
+		Param("fieldManager", "apply_test").
 		Body(yamlBody).
 		DoRaw()
 	if err != nil {

staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta.go

@@ -176,6 +176,9 @@ func ValidateObjectMetaAccessor(meta metav1.Object, requiresNamespace bool, name
 			allErrs = append(allErrs, field.Invalid(fldPath.Child("clusterName"), meta.GetClusterName(), msg))
 		}
 	}
+	for _, entry := range meta.GetManagedFields() {
+		allErrs = append(allErrs, v1validation.ValidateFieldManager(entry.Manager, fldPath.Child("fieldManager"))...)
+	}
 	allErrs = append(allErrs, ValidateNonnegativeField(meta.GetGeneration(), fldPath.Child("generation"))...)
 	allErrs = append(allErrs, v1validation.ValidateLabels(meta.GetLabels(), fldPath.Child("labels"))...)
 	allErrs = append(allErrs, ValidateAnnotations(meta.GetAnnotations(), fldPath.Child("annotations"))...)
@@ -239,6 +242,9 @@ func ValidateObjectMetaAccessorUpdate(newMeta, oldMeta metav1.Object, fldPath *f
 		allErrs = append(allErrs, field.Invalid(fldPath.Child("generation"), newMeta.GetGeneration(), "must not be decremented"))
 	}
 
+	for _, entry := range newMeta.GetManagedFields() {
+		allErrs = append(allErrs, v1validation.ValidateFieldManager(entry.Manager, fldPath.Child("fieldManager"))...)
+	}
 	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetName(), oldMeta.GetName(), fldPath.Child("name"))...)
 	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetNamespace(), oldMeta.GetNamespace(), fldPath.Child("namespace"))...)
 	allErrs = append(allErrs, ValidateImmutableField(newMeta.GetUID(), oldMeta.GetUID(), fldPath.Child("uid"))...)

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/types.go

@@ -506,6 +506,13 @@ type CreateOptions struct {
 	// +optional
 	DryRun []string `json:"dryRun,omitempty" protobuf:"bytes,1,rep,name=dryRun"`
 	// +k8s:deprecated=includeUninitialized,protobuf=2
+
+	// fieldManager is a name associated with the actor or entity
+	// that is making these changes. The value must be less than or
+	// 128 characters long, and only contain printable characters,
+	// as defined by https://golang.org/pkg/unicode/#IsPrint.
+	// +optional
+	FieldManager string `json:"fieldManager,omitempty" protobuf:"bytes,3,name=fieldManager"`
 }
 
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
@@ -528,6 +535,16 @@ type PatchOptions struct {
 	// flag must be unset for non-apply patch requests.
 	// +optional
 	Force *bool `json:"force,omitempty" protobuf:"varint,2,opt,name=force"`
+
+	// fieldManager is a name associated with the actor or entity
+	// that is making these changes. The value must be less than or
+	// 128 characters long, and only contain printable characters,
+	// as defined by https://golang.org/pkg/unicode/#IsPrint. This
+	// field is required for apply requests
+	// (application/apply-patch) but optional for non-apply patch
+	// types (JsonPatch, MergePatch, StrategicMergePatch).
+	// +optional
+	FieldManager string `json:"fieldManager,omitempty" protobuf:"bytes,3,name=fieldManager"`
 }
 
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
@@ -544,6 +561,13 @@ type UpdateOptions struct {
 	// - All: all dry run stages will be processed
 	// +optional
 	DryRun []string `json:"dryRun,omitempty" protobuf:"bytes,1,rep,name=dryRun"`
+
+	// fieldManager is a name associated with the actor or entity
+	// that is making these changes. The value must be less than or
+	// 128 characters long, and only contain printable characters,
+	// as defined by https://golang.org/pkg/unicode/#IsPrint.
+	// +optional
+	FieldManager string `json:"fieldManager,omitempty" protobuf:"bytes,2,name=fieldManager"`
 }
 
 // Preconditions must be fulfilled before an operation (update, delete, etc.) is carried out.

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/validation/BUILD

@@ -10,7 +10,11 @@ go_test(
     name = "go_default_test",
     srcs = ["validation_test.go"],
     embed = [":go_default_library"],
-    deps = ["//staging/src/k8s.io/apimachinery/pkg/util/validation/field:go_default_library"],
+    deps = [
+        "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/util/validation/field:go_default_library",
+    ],
 )
 
 go_library(

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/validation/validation.go

@@ -17,6 +17,9 @@ limitations under the License.
 package validation
 
 import (
+	"fmt"
+	"unicode"
+
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/sets"
@@ -91,22 +94,58 @@ func ValidateDeleteOptions(options *metav1.DeleteOptions) field.ErrorList {
 }
 
 func ValidateCreateOptions(options *metav1.CreateOptions) field.ErrorList {
-	return ValidateDryRun(field.NewPath("dryRun"), options.DryRun)
+	return append(
+		ValidateFieldManager(options.FieldManager, field.NewPath("fieldManager")),
+		ValidateDryRun(field.NewPath("dryRun"), options.DryRun)...,
+	)
 }
 
 func ValidateUpdateOptions(options *metav1.UpdateOptions) field.ErrorList {
-	return ValidateDryRun(field.NewPath("dryRun"), options.DryRun)
+	return append(
+		ValidateFieldManager(options.FieldManager, field.NewPath("fieldManager")),
+		ValidateDryRun(field.NewPath("dryRun"), options.DryRun)...,
+	)
 }
 
 func ValidatePatchOptions(options *metav1.PatchOptions, patchType types.PatchType) field.ErrorList {
 	allErrs := field.ErrorList{}
-	if patchType != types.ApplyPatchType && options.Force != nil {
+	if patchType != types.ApplyPatchType {
+		if options.Force != nil {
 			allErrs = append(allErrs, field.Forbidden(field.NewPath("force"), "may not be specified for non-apply patch"))
 		}
+	} else {
+		if options.FieldManager == "" {
+			// This field is defaulted to "kubectl" by kubectl, but HAS TO be explicitly set by controllers.
+			allErrs = append(allErrs, field.Required(field.NewPath("fieldManager"), "is required for apply patch"))
+		}
+	}
+	allErrs = append(allErrs, ValidateFieldManager(options.FieldManager, field.NewPath("fieldManager"))...)
 	allErrs = append(allErrs, ValidateDryRun(field.NewPath("dryRun"), options.DryRun)...)
 	return allErrs
 }
 
+var FieldManagerMaxLength = 128
+
+// ValidateFieldManager valides that the fieldManager is the proper length and
+// only has printable characters.
+func ValidateFieldManager(fieldManager string, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+	// the field can not be set as a `*string`, so a empty string ("") is
+	// considered as not set and is defaulted by the rest of the process
+	// (unless apply is used, in which case it is required).
+	if len(fieldManager) > FieldManagerMaxLength {
+		allErrs = append(allErrs, field.TooLong(fldPath, fieldManager, FieldManagerMaxLength))
+	}
+	// Verify that all characters are printable.
+	for i, r := range fieldManager {
+		if !unicode.IsPrint(r) {
+			allErrs = append(allErrs, field.Invalid(fldPath, fieldManager, fmt.Sprintf("invalid character %#U (at position %d)", r, i)))
+		}
+	}
+
+	return allErrs
+}
+
 var allowedDryRunValues = sets.NewString(metav1.DryRunAll)
 
 // ValidateDryRun validates that a dryRun query param only contains allowed values.

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/validation/validation_test.go

@@ -21,6 +21,8 @@ import (
 	"strings"
 	"testing"
 
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/validation/field"
 )
 
@@ -125,3 +127,117 @@ func TestInvalidDryRun(t *testing.T) {
 	}
 
 }
+
+func boolPtr(b bool) *bool {
+	return &b
+}
+
+func TestValidPatchOptions(t *testing.T) {
+	tests := []struct {
+		opts      metav1.PatchOptions
+		patchType types.PatchType
+	}{
+		{
+			opts: metav1.PatchOptions{
+				Force:        boolPtr(true),
+				FieldManager: "kubectl",
+			},
+			patchType: types.ApplyPatchType,
+		},
+		{
+			opts: metav1.PatchOptions{
+				FieldManager: "kubectl",
+			},
+			patchType: types.ApplyPatchType,
+		},
+		{
+			opts:      metav1.PatchOptions{},
+			patchType: types.MergePatchType,
+		},
+		{
+			opts: metav1.PatchOptions{
+				FieldManager: "patcher",
+			},
+			patchType: types.MergePatchType,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("%v", test.opts), func(t *testing.T) {
+			errs := ValidatePatchOptions(&test.opts, test.patchType)
+			if len(errs) != 0 {
+				t.Fatalf("Expected no failures, got: %v", errs)
+			}
+		})
+	}
+}
+
+func TestInvalidPatchOptions(t *testing.T) {
+	tests := []struct {
+		opts      metav1.PatchOptions
+		patchType types.PatchType
+	}{
+		// missing manager
+		{
+			opts:      metav1.PatchOptions{},
+			patchType: types.ApplyPatchType,
+		},
+		// force on non-apply
+		{
+			opts: metav1.PatchOptions{
+				Force: boolPtr(true),
+			},
+			patchType: types.MergePatchType,
+		},
+		// manager and force on non-apply
+		{
+			opts: metav1.PatchOptions{
+				FieldManager: "kubectl",
+				Force:        boolPtr(false),
+			},
+			patchType: types.MergePatchType,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("%v", test.opts), func(t *testing.T) {
+			errs := ValidatePatchOptions(&test.opts, test.patchType)
+			if len(errs) == 0 {
+				t.Fatal("Expected failures, got none.")
+			}
+		})
+	}
+}
+
+func TestValidateFieldManagerValid(t *testing.T) {
+	tests := []string{
+		"filedManager",
+		"你好", // Hello
+		"🍔",
+	}
+
+	for _, test := range tests {
+		t.Run(test, func(t *testing.T) {
+			errs := ValidateFieldManager(test, field.NewPath("fieldManager"))
+			if len(errs) != 0 {
+				t.Errorf("Validation failed: %v", errs)
+			}
+		})
+	}
+}
+
+func TestValidateFieldManagerInvalid(t *testing.T) {
+	tests := []string{
+		"field\nmanager", // Contains invalid character \n
+		"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", // Has 129 chars
+	}
+
+	for _, test := range tests {
+		t.Run(test, func(t *testing.T) {
+			errs := ValidateFieldManager(test, field.NewPath("fieldManager"))
+			if len(errs) == 0 {
+				t.Errorf("Validation should have failed")
+			}
+		})
+	}
+}

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/BUILD

@@ -9,6 +9,7 @@ load(
 go_test(
     name = "go_default_test",
     srcs = [
+        "create_test.go",
         "namer_test.go",
         "rest_test.go",
     ],

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/create.go

@@ -17,11 +17,14 @@ limitations under the License.
 package handlers
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"net/http"
 	"strings"
 	"time"
+	"unicode"
+	"unicode/utf8"
 
 	"k8s.io/apimachinery/pkg/api/errors"
 	metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
@@ -141,7 +144,7 @@ func createHandler(r rest.NamedCreater, scope RequestScope, admit admission.Inte
 				return
 			}
 
-			obj, err = scope.FieldManager.Update(liveObj, obj, prefixFromUserAgent(req.UserAgent()))
+			obj, err = scope.FieldManager.Update(liveObj, obj, managerOrUserAgent(options.FieldManager, req.UserAgent()))
 			if err != nil {
 				scope.err(fmt.Errorf("failed to update object (Create for %v) managed fields: %v", scope.Kind, err), w, req)
 				return
@@ -193,6 +196,31 @@ func (c *namedCreaterAdapter) Create(ctx context.Context, name string, obj runti
 	return c.Creater.Create(ctx, obj, createValidatingAdmission, options)
 }
 
-func prefixFromUserAgent(u string) string {
+// manager is assumed to be already a valid value, we need to make
-	return strings.Split(u, "/")[0]
+// userAgent into a valid value too.
+func managerOrUserAgent(manager, userAgent string) string {
+	if manager != "" {
+		return manager
+	}
+	return prefixFromUserAgent(userAgent)
+}
+
+// prefixFromUserAgent takes the characters preceding the first /, quote
+// unprintable character and then trim what's beyond the
+// FieldManagerMaxLength limit.
+func prefixFromUserAgent(u string) string {
+	m := strings.Split(u, "/")[0]
+	buf := bytes.NewBuffer(nil)
+	for _, r := range m {
+		// Ignore non-printable characters
+		if !unicode.IsPrint(r) {
+			continue
+		}
+		// Only append if we have room for it
+		if buf.Len()+utf8.RuneLen(r) > validation.FieldManagerMaxLength {
+			break
+		}
+		buf.WriteRune(r)
+	}
+	return buf.String()
 }

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/create_test.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2019 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 handlers
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestManagerOrUserAgent(t *testing.T) {
+	tests := []struct {
+		manager   string
+		userAgent string
+		expected  string
+	}{
+		{
+			manager:   "",
+			userAgent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36",
+			expected:  "Mozilla",
+		},
+		{
+			manager:   "",
+			userAgent: "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff/Something",
+			expected:  "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+		},
+		{
+			manager:   "",
+			userAgent: "🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔",
+			expected:  "🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔🍔",
+		},
+		{
+			manager:   "manager",
+			userAgent: "userAgent",
+			expected:  "manager",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("%v-%v", test.manager, test.userAgent), func(t *testing.T) {
+			got := managerOrUserAgent(test.manager, test.userAgent)
+			if got != test.expected {
+				t.Errorf("Wanted %#v, got %#v", test.expected, got)
+			}
+		})
+	}
+}

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/fieldmanager.go

@@ -30,8 +30,6 @@ import (
 	"sigs.k8s.io/structured-merge-diff/merge"
 )
 
-const applyManager = "apply"
-
 // FieldManager updates the managed fields and merge applied
 // configurations.
 type FieldManager struct {
@@ -141,7 +139,7 @@ func (f *FieldManager) Update(liveObj, newObj runtime.Object, manager string) (r
 
 // Apply is used when server-side apply is called, as it merges the
 // object and update the managed fields.
-func (f *FieldManager) Apply(liveObj runtime.Object, patch []byte, force bool) (runtime.Object, error) {
+func (f *FieldManager) Apply(liveObj runtime.Object, patch []byte, fieldManager string, force bool) (runtime.Object, error) {
 	// If the object doesn't have metadata, apply isn't allowed.
 	if _, err := meta.Accessor(liveObj); err != nil {
 		return nil, fmt.Errorf("couldn't get accessor: %v", err)
@@ -168,7 +166,7 @@ func (f *FieldManager) Apply(liveObj runtime.Object, patch []byte, force bool) (
 	if err != nil {
 		return nil, fmt.Errorf("failed to create typed live object: %v", err)
 	}
-	manager, err := f.buildManagerInfo(applyManager, metav1.ManagedFieldsOperationApply)
+	manager, err := f.buildManagerInfo(fieldManager, metav1.ManagedFieldsOperationApply)
 	if err != nil {
 		return nil, fmt.Errorf("failed to build manager identifier: %v", err)
 	}

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/fieldmanager_test.go

@@ -96,7 +96,7 @@ func TestApplyStripsFields(t *testing.T) {
 				}],
 			"resourceVersion": "b"
 		}
-	}`), false)
+	}`), "fieldmanager_test", false)
 	if err != nil {
 		t.Fatalf("failed to apply object: %v", err)
 	}
@@ -110,6 +110,7 @@ func TestApplyStripsFields(t *testing.T) {
 		t.Fatalf("fields did not get stripped on apply: %v", m)
 	}
 }
+
 func TestApplyDoesNotStripLabels(t *testing.T) {
 	f := NewTestFieldManager(t)
 
@@ -123,7 +124,7 @@ func TestApplyDoesNotStripLabels(t *testing.T) {
 				"a": "b"
 			},
 		}
-	}`), false)
+	}`), "fieldmanager_test", false)
 	if err != nil {
 		t.Fatalf("failed to apply object: %v", err)
 	}

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/patch.go

@@ -320,7 +320,7 @@ func (p *jsonPatcher) applyPatchToCurrentObject(currentObject runtime.Object) (r
 	}
 
 	if p.fieldManager != nil {
-		if objToUpdate, err = p.fieldManager.Update(currentObject, objToUpdate, prefixFromUserAgent(p.userAgent)); err != nil {
+		if objToUpdate, err = p.fieldManager.Update(currentObject, objToUpdate, managerOrUserAgent(p.options.FieldManager, p.userAgent)); err != nil {
 			return nil, fmt.Errorf("failed to update object (json PATCH for %v) managed fields: %v", p.kind, err)
 		}
 	}
@@ -387,7 +387,7 @@ func (p *smpPatcher) applyPatchToCurrentObject(currentObject runtime.Object) (ru
 	}
 
 	if p.fieldManager != nil {
-		if newObj, err = p.fieldManager.Update(currentObject, newObj, prefixFromUserAgent(p.userAgent)); err != nil {
+		if newObj, err = p.fieldManager.Update(currentObject, newObj, managerOrUserAgent(p.options.FieldManager, p.userAgent)); err != nil {
 			return nil, fmt.Errorf("failed to update object (smp PATCH for %v) managed fields: %v", p.kind, err)
 		}
 	}
@@ -414,7 +414,7 @@ func (p *applyPatcher) applyPatchToCurrentObject(obj runtime.Object) (runtime.Ob
 	if p.fieldManager == nil {
 		panic("FieldManager must be installed to run apply")
 	}
-	return p.fieldManager.Apply(obj, p.patch, force)
+	return p.fieldManager.Apply(obj, p.patch, p.options.FieldManager, force)
 }
 
 func (p *applyPatcher) createNewObject() (runtime.Object, error) {

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/update.go

@@ -124,7 +124,7 @@ func UpdateResource(r rest.Updater, scope RequestScope, admit admission.Interfac
 		transformers := []rest.TransformFunc{}
 		if scope.FieldManager != nil {
 			transformers = append(transformers, func(_ context.Context, newObj, liveObj runtime.Object) (runtime.Object, error) {
-				obj, err := scope.FieldManager.Update(liveObj, newObj, prefixFromUserAgent(req.UserAgent()))
+				obj, err := scope.FieldManager.Update(liveObj, newObj, managerOrUserAgent(options.FieldManager, req.UserAgent()))
 				if err != nil {
 					return nil, fmt.Errorf("failed to update object (Update for %v) managed fields: %v", scope.Kind, err)
 				}

test/cmd/apply.sh

@@ -249,12 +249,12 @@ run_kubectl_apply_tests() {
   set -o errexit
 
   create_and_use_new_namespace
-  kube::log::status "Testing kubectl apply --server-side"
+  kube::log::status "Testing kubectl apply --experimental-server-side"
   ## kubectl apply should create the resource that doesn't exist yet
   # Pre-Condition: no POD exists
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
   # Command: apply a pod "test-pod" (doesn't exist) should create this pod
-  kubectl apply --server-side -f hack/testdata/pod.yaml "${kube_flags[@]}"
+  kubectl apply --experimental-server-side -f hack/testdata/pod.yaml "${kube_flags[@]}"
   # Post-Condition: pod "test-pod" is created
   kube::test::get_object_assert 'pods test-pod' "{{${labels_field}.name}}" 'test-pod-label'
   # Clean up
@@ -265,13 +265,13 @@ run_kubectl_apply_tests() {
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
 
   # apply dry-run
-  kubectl apply --server-side --server-dry-run -f hack/testdata/pod.yaml "${kube_flags[@]}"
+  kubectl apply --experimental-server-side --server-dry-run -f hack/testdata/pod.yaml "${kube_flags[@]}"
   # No pod exists
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
   # apply non dry-run creates the pod
-  kubectl apply --server-side -f hack/testdata/pod.yaml "${kube_flags[@]}"
+  kubectl apply --experimental-server-side -f hack/testdata/pod.yaml "${kube_flags[@]}"
   # apply changes
-  kubectl apply --server-side --server-dry-run -f hack/testdata/pod-apply.yaml "${kube_flags[@]}"
+  kubectl apply --experimental-server-side --server-dry-run -f hack/testdata/pod-apply.yaml "${kube_flags[@]}"
   # Post-Condition: label still has initial value
   kube::test::get_object_assert 'pods test-pod' "{{${labels_field}.name}}" 'test-pod-label'
 
@@ -302,7 +302,7 @@ run_kubectl_apply_tests() {
 __EOF__
 
   # Dry-run create the CR
-  kubectl "${kube_flags[@]}" apply --server-side --server-dry-run -f hack/testdata/CRD/resource.yaml "${kube_flags[@]}"
+  kubectl "${kube_flags[@]}" apply --experimental-server-side --server-dry-run -f hack/testdata/CRD/resource.yaml "${kube_flags[@]}"
   # Make sure that the CR doesn't exist
   ! kubectl "${kube_flags[@]}" get resource/myobj
 

test/integration/apiserver/apply/BUILD

@@ -2,10 +2,15 @@ load("@io_bazel_rules_go//go:def.bzl", "go_test")
 
 go_test(
     name = "go_default_test",
+    size = "large",
     srcs = [
         "apply_test.go",
         "main_test.go",
     ],
+    tags = [
+        "etcd",
+        "integration",
+    ],
     deps = [
         "//pkg/master:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",

test/integration/apiserver/apply/apply_test.go

@@ -106,6 +106,7 @@ func TestApplyAlsoCreates(t *testing.T) {
 			Namespace("default").
 			Resource(tc.resource).
 			Name(tc.name).
+			Param("fieldManager", "apply_test").
 			Body([]byte(tc.body)).
 			Do().
 			Get()
@@ -132,6 +133,7 @@ func TestCreateOnApplyFailsWithUID(t *testing.T) {
 		Namespace("default").
 		Resource("pods").
 		Name("test-pod-uid").
+		Param("fieldManager", "apply_test").
 		Body([]byte(`{
 			"apiVersion": "v1",
 			"kind": "Pod",
@@ -194,6 +196,7 @@ func TestApplyUpdateApplyConflictForced(t *testing.T) {
 		Namespace("default").
 		Resource("deployments").
 		Name("deployment").
+		Param("fieldManager", "apply_test").
 		Body(obj).Do().Get()
 	if err != nil {
 		t.Fatalf("Failed to create object using Apply patch: %v", err)
@@ -214,6 +217,7 @@ func TestApplyUpdateApplyConflictForced(t *testing.T) {
 		Namespace("default").
 		Resource("deployments").
 		Name("deployment").
+		Param("fieldManager", "apply_test").
 		Body([]byte(obj)).Do().Get()
 	if err == nil {
 		t.Fatalf("Expecting to get conflicts when applying object")
@@ -232,6 +236,7 @@ func TestApplyUpdateApplyConflictForced(t *testing.T) {
 		Resource("deployments").
 		Name("deployment").
 		Param("force", "true").
+		Param("fieldManager", "apply_test").
 		Body([]byte(obj)).Do().Get()
 	if err != nil {
 		t.Fatalf("Failed to apply object with force: %v", err)
@@ -249,6 +254,7 @@ func TestApplyManagedFields(t *testing.T) {
 		Namespace("default").
 		Resource("configmaps").
 		Name("test-cm").
+		Param("fieldManager", "apply_test").
 		Body([]byte(`{
 			"apiVersion": "v1",
 			"kind": "ConfigMap",
@@ -273,6 +279,7 @@ func TestApplyManagedFields(t *testing.T) {
 		Namespace("default").
 		Resource("configmaps").
 		Name("test-cm").
+		Param("fieldManager", "updater").
 		Body([]byte(`{"data":{"key": "new value"}}`)).Do().Get()
 	if err != nil {
 		t.Fatalf("Failed to patch object: %v", err)
@@ -306,7 +313,7 @@ func TestApplyManagedFields(t *testing.T) {
 			},
 			"managedFields": [
 				{
-					"manager": "apply",
+					"manager": "apply_test",
 					"operation": "Apply",
 					"apiVersion": "v1",
 					"fields": {
@@ -318,7 +325,7 @@ func TestApplyManagedFields(t *testing.T) {
 					}
 				},
 				{
-					"manager": "` + accessor.GetManagedFields()[1].Manager + `",
+					"manager": "updater",
 					"operation": "Update",
 					"apiVersion": "v1",
 					"time": "` + accessor.GetManagedFields()[1].Time.UTC().Format(time.RFC3339) + `",
@@ -360,6 +367,7 @@ func TestApplyRemovesEmptyManagedFields(t *testing.T) {
 		Namespace("default").
 		Resource("configmaps").
 		Name("test-cm").
+		Param("fieldManager", "apply_test").
 		Body(obj).
 		Do().
 		Get()
@@ -371,6 +379,7 @@ func TestApplyRemovesEmptyManagedFields(t *testing.T) {
 		Namespace("default").
 		Resource("configmaps").
 		Name("test-cm").
+		Param("fieldManager", "apply_test").
 		Body(obj).Do().Get()
 	if err != nil {
 		t.Fatalf("Failed to patch object: %v", err)
@@ -390,3 +399,42 @@ func TestApplyRemovesEmptyManagedFields(t *testing.T) {
 		t.Fatalf("Object contains unexpected managedFields: %v", managed)
 	}
 }
+
+func TestApplyRequiresFieldManager(t *testing.T) {
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, genericfeatures.ServerSideApply, true)()
+
+	_, client, closeFn := setup(t)
+	defer closeFn()
+
+	obj := []byte(`{
+		"apiVersion": "v1",
+		"kind": "ConfigMap",
+		"metadata": {
+			"name": "test-cm",
+			"namespace": "default"
+		}
+	}`)
+
+	_, err := client.CoreV1().RESTClient().Patch(types.ApplyPatchType).
+		Namespace("default").
+		Resource("configmaps").
+		Name("test-cm").
+		Body(obj).
+		Do().
+		Get()
+	if err == nil {
+		t.Fatalf("Apply should fail to create without fieldManager")
+	}
+
+	_, err = client.CoreV1().RESTClient().Patch(types.ApplyPatchType).
+		Namespace("default").
+		Resource("configmaps").
+		Name("test-cm").
+		Param("fieldManager", "apply_test").
+		Body(obj).
+		Do().
+		Get()
+	if err != nil {
+		t.Fatalf("Apply failed to create with fieldManager: %v", err)
+	}
+}

test/integration/auth/rbac_test.go

@@ -567,6 +567,9 @@ func TestRBAC(t *testing.T) {
 			if r.verb == "PATCH" {
 				// For patch operations, use the apply content type
 				req.Header.Add("Content-Type", string(types.ApplyPatchType))
+				q := req.URL.Query()
+				q.Add("fieldManager", "rbac_test")
+				req.URL.RawQuery = q.Encode()
 			}
 
 			if err != nil {