Remove dead merge conflict code.

api/internal/conflict/factory.go

@@ -1,23 +0,0 @@
-// Copyright 2020 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package conflict
-
-import (
-	"sigs.k8s.io/kustomize/api/resid"
-	"sigs.k8s.io/kustomize/api/resource"
-)
-
-type cdFactory struct{}
-
-var _ resource.ConflictDetectorFactory = &cdFactory{}
-
-// NewFactory returns a new conflict detector factory.
-func NewFactory() resource.ConflictDetectorFactory {
-	return &cdFactory{}
-}
-
-// New returns an instance of smPatchMergeOnlyDetector.
-func (c cdFactory) New(_ resid.Gvk) (resource.ConflictDetector, error) {
-	return &smPatchMergeOnlyDetector{}, nil
-}

api/internal/conflict/smpatchmergeonlydetector.go

@@ -1,33 +0,0 @@
-// Copyright 2020 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package conflict
-
-import (
-	"sigs.k8s.io/kustomize/api/resource"
-)
-
-// smPatchMergeOnlyDetector ignores conflicts,
-// but does real strategic merge patching.
-// This is part of an effort to eliminate dependence on
-// apimachinery package to allow kustomize integration
-// into kubectl (#2506 and #1500)
-type smPatchMergeOnlyDetector struct{}
-
-var _ resource.ConflictDetector = &smPatchMergeOnlyDetector{}
-
-func (c *smPatchMergeOnlyDetector) HasConflict(
-	_, _ *resource.Resource) (bool, error) {
-	return false, nil
-}
-
-// There's at least one case that doesn't work.  Suppose one has a
-// Deployment with a volume with the bizarre "emptyDir: {}" entry.
-// If you want to get rid of this entry via a patch containing
-// the entry "emptyDir: null", then the following won't work,
-// because null entries are eliminated.
-func (c *smPatchMergeOnlyDetector) MergePatches(
-	r, patch *resource.Resource) (*resource.Resource, error) {
-	err := r.ApplySmPatch(patch)
-	return r, err
-}

api/internal/plugins/execplugin/execplugin_test.go

@@ -32,8 +32,7 @@ s/$BAR/bar baz/g
 		t.Fatal(err)
 	}
 	pvd := provider.NewDefaultDepProvider()
-	rf := resmap.NewFactory(
-		pvd.GetResourceFactory(), pvd.GetConflictDetectorFactory())
+	rf := resmap.NewFactory(pvd.GetResourceFactory())
 	pluginConfig := rf.RF().FromMap(
 		map[string]interface{}{
 			"apiVersion": "someteam.example.com/v1",

api/internal/plugins/loader/loader_test.go

@@ -51,8 +51,7 @@ func TestLoader(t *testing.T) {
 		BuildGoPlugin("someteam.example.com", "v1", "SomeServiceGenerator")
 	defer th.Reset()
 	p := provider.NewDefaultDepProvider()
-	rmF := resmap.NewFactory(
-		p.GetResourceFactory(), p.GetConflictDetectorFactory())
+	rmF := resmap.NewFactory(p.GetResourceFactory())
 	fLdr, err := loader.NewLoader(
 		loader.RestrictionRootOnly,
 		filesys.Separator, filesys.MakeFsInMemory())

api/internal/target/maker_test.go

@@ -36,8 +36,7 @@ func makeKustTargetWithRf(
 	if err != nil {
 		t.Fatal(err)
 	}
-	rf := resmap.NewFactory(
-		pvd.GetResourceFactory(), pvd.GetConflictDetectorFactory())
+	rf := resmap.NewFactory(pvd.GetResourceFactory())
 	pc := konfig.DisabledPluginConfig()
 	return target.NewKustTarget(
 		ldr,

api/internal/target/multitransformer.go

@@ -4,15 +4,12 @@
 package target
 
 import (
-	"fmt"
-
 	"sigs.k8s.io/kustomize/api/resmap"
 )
 
 // multiTransformer contains a list of transformers.
 type multiTransformer struct {
-	transformers         []resmap.Transformer
-	checkConflictEnabled bool
+	transformers []resmap.Transformer
 }
 
 var _ resmap.Transformer = &multiTransformer{}
@@ -20,8 +17,8 @@ var _ resmap.Transformer = &multiTransformer{}
 // newMultiTransformer constructs a multiTransformer.
 func newMultiTransformer(t []resmap.Transformer) resmap.Transformer {
 	r := &multiTransformer{
-		transformers:         make([]resmap.Transformer, len(t)),
-		checkConflictEnabled: false}
+		transformers: make([]resmap.Transformer, len(t)),
+	}
 	copy(r.transformers, t)
 	return r
 }
@@ -29,13 +26,6 @@ func newMultiTransformer(t []resmap.Transformer) resmap.Transformer {
 // Transform applies the member transformers in order to the resources,
 // optionally detecting and erroring on commutation conflict.
 func (o *multiTransformer) Transform(m resmap.ResMap) error {
-	if o.checkConflictEnabled {
-		return o.transformWithCheckConflict(m)
-	}
-	return o.transform(m)
-}
-
-func (o *multiTransformer) transform(m resmap.ResMap) error {
 	for _, t := range o.transformers {
 		if err := t.Transform(m); err != nil {
 			return err
@@ -44,30 +34,3 @@ func (o *multiTransformer) transform(m resmap.ResMap) error {
 	}
 	return nil
 }
-
-// Of the len(o.transformers)! possible transformer orderings, compare to a reversed order.
-// A spot check to perform when the transformations are supposed to be commutative.
-// Fail if there's a difference in the result.
-func (o *multiTransformer) transformWithCheckConflict(m resmap.ResMap) error {
-	mcopy := m.DeepCopy()
-	err := o.transform(m)
-	if err != nil {
-		return err
-	}
-	o.reverseTransformers()
-	err = o.transform(mcopy)
-	if err != nil {
-		return err
-	}
-	err = m.ErrorIfNotEqualSets(mcopy)
-	if err != nil {
-		return fmt.Errorf("found conflict between different patches\n%v", err)
-	}
-	return nil
-}
-
-func (o *multiTransformer) reverseTransformers() {
-	for i, j := 0, len(o.transformers)-1; i < j; i, j = i+1, j-1 {
-		o.transformers[i], o.transformers[j] = o.transformers[j], o.transformers[i]
-	}
-}