Remove dead merge conflict code.

api/filters/nameref/nameref_test.go

@@ -233,7 +233,7 @@ map:
 			}
 			tc.filter.Referrer = referrer
 
-			resMapFactory := resmap.NewFactory(factory, nil)
+			resMapFactory := resmap.NewFactory(factory)
 			candidatesRes, err := factory.SliceFromBytesWithNames(
 				tc.originalNames, []byte(tc.candidates))
 			if err != nil {
@@ -334,7 +334,7 @@ metadata:
 			}
 			tc.filter.Referrer = referrer
 
-			resMapFactory := resmap.NewFactory(factory, nil)
+			resMapFactory := resmap.NewFactory(factory)
 			candidatesRes, err := factory.SliceFromBytesWithNames(
 				tc.originalNames, []byte(tc.candidates))
 			if err != nil {
@@ -751,7 +751,7 @@ ref:
 			}
 			tc.filter.Referrer = referrer
 
-			resMapFactory := resmap.NewFactory(factory, nil)
+			resMapFactory := resmap.NewFactory(factory)
 			candidatesRes, err := factory.SliceFromBytesWithNames(
 				tc.originalNames, []byte(tc.candidates))
 			if err != nil {

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

@@ -4,38 +4,28 @@
 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{}
 
 // 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
 }
 
 // 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]
-	}
-}

api/krusty/kustomizer.go

@@ -52,9 +52,7 @@ func MakeKustomizer(o *Options) *Kustomizer {
 // and Run can be called on each of them).
 func (b *Kustomizer) Run(
 	fSys filesys.FileSystem, path string) (resmap.ResMap, error) {
-	resmapFactory := resmap.NewFactory(
-		b.depProvider.GetResourceFactory(),
-		b.depProvider.GetConflictDetectorFactory())
+	resmapFactory := resmap.NewFactory(b.depProvider.GetResourceFactory())
 	lr := fLdr.RestrictionNone
 	if b.options.LoadRestrictions == types.LoadRestrictionsRootOnly {
 		lr = fLdr.RestrictionRootOnly

api/krusty/multiplepatch_test.go

@@ -706,7 +706,7 @@ metadata:
 `)
 }
 
-func TestMultiplePatchesWithConflict(t *testing.T) {
+func TestNonCommutablePatches(t *testing.T) {
 	th := kusttest_test.MakeHarness(t)
 	makeCommonFilesForMultiplePatchTests(th)
 	th.WriteF("overlay/staging/deployment-patch1.yaml", `

api/provider/depprovider.go

@@ -6,51 +6,26 @@ package provider
 import (
 	"sigs.k8s.io/kustomize/api/hasher"
 	"sigs.k8s.io/kustomize/api/ifc"
-	"sigs.k8s.io/kustomize/api/internal/conflict"
 	"sigs.k8s.io/kustomize/api/internal/validate"
 	"sigs.k8s.io/kustomize/api/resource"
 )
 
 // DepProvider is a dependency provider, injecting different
 // implementations depending on the context.
-//
-// Notes on interfaces:
-//
-// - resource.ConflictDetector
-//
-//   implemented by api/internal/conflict.smPatchMergeOnlyDetector
-//
-//           At time of writing, this doesn't report conflicts,
-//           but it does know how to merge patches. Conflict
-//           reporting isn't vital to kustomize function.  It's
-//           rare that a person would configure one transformer
-//           with many patches, much less so many that it became
-//           hard to spot conflicts.  In the case of an undetected
-//           conflict, the last patch applied wins, likely what
-//           the user wants anyway.  Regardless, the effect of this
-//           is plainly visible and usable in the output, even if
-//           a conflict happened but wasn't reported as an error.
-//
-// - ifc.Validator
-//
-//   implemented by api/internal/validate.FieldValidator
-//
-//            See TODO inside the validator for status.
-//            At time of writing, this is a do-nothing
-//            validator as it's not critical to kustomize function.
-//
 type DepProvider struct {
-	resourceFactory          *resource.Factory
-	conflictDectectorFactory resource.ConflictDetectorFactory
-	fieldValidator           ifc.Validator
+	resourceFactory *resource.Factory
+	// implemented by api/internal/validate.FieldValidator
+	// See TODO inside the validator for status.
+	// At time of writing, this is a do-nothing
+	// validator as it's not critical to kustomize function.
+	fieldValidator ifc.Validator
 }
 
 func NewDepProvider() *DepProvider {
 	rf := resource.NewFactory(&hasher.Hasher{})
 	return &DepProvider{
-		resourceFactory:          rf,
-		conflictDectectorFactory: conflict.NewFactory(),
-		fieldValidator:           validate.NewFieldValidator(),
+		resourceFactory: rf,
+		fieldValidator:  validate.NewFieldValidator(),
 	}
 }
 
@@ -62,10 +37,6 @@ func (dp *DepProvider) GetResourceFactory() *resource.Factory {
 	return dp.resourceFactory
 }
 
-func (dp *DepProvider) GetConflictDetectorFactory() resource.ConflictDetectorFactory {
-	return dp.conflictDectectorFactory
-}
-
 func (dp *DepProvider) GetFieldValidator() ifc.Validator {
 	return dp.fieldValidator
 }

api/resmap/factory.go

@@ -16,14 +16,11 @@ import (
 type Factory struct {
 	// Makes resources.
 	resF *resource.Factory
-	// Makes ConflictDetectors.
-	cdf resource.ConflictDetectorFactory
 }
 
 // NewFactory returns a new resmap.Factory.
-func NewFactory(
-	rf *resource.Factory, cdf resource.ConflictDetectorFactory) *Factory {
-	return &Factory{resF: rf, cdf: cdf}
+func NewFactory(rf *resource.Factory) *Factory {
+	return &Factory{resF: rf}
 }
 
 // RF returns a resource.Factory.
@@ -126,13 +123,6 @@ func (rmF *Factory) FromSecretArgs(
 	return rmF.FromResource(res), nil
 }
 
-// ConflatePatches creates a new ResMap containing a merger of the
-// incoming patches.
-// Error if conflict found.
-func (rmF *Factory) ConflatePatches(patches []*resource.Resource) (ResMap, error) {
-	return (&merginator{cdf: rmF.cdf}).ConflatePatches(patches)
-}
-
 func newResMapFromResourceSlice(
 	resources []*resource.Resource) (ResMap, error) {
 	result := New()

api/resmap/factory_test.go

@@ -13,7 +13,6 @@ import (
 	"sigs.k8s.io/kustomize/api/kv"
 	"sigs.k8s.io/kustomize/api/loader"
 	. "sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
 	resmaptest_test "sigs.k8s.io/kustomize/api/testutils/resmaptest"
 	valtest_test "sigs.k8s.io/kustomize/api/testutils/valtest"
 	"sigs.k8s.io/kustomize/api/types"
@@ -350,56 +349,3 @@ metadata:
 		})
 	}
 }
-
-func TestConflatePatches_Empty(t *testing.T) {
-	rm, err := rmF.ConflatePatches([]*resource.Resource{})
-	assert.NoError(t, err)
-	assert.Equal(t, 0, rm.Size())
-}
-
-func TestConflatePatches(t *testing.T) {
-	var (
-		err    error
-		yml    []byte
-		r1, r2 *resource.Resource
-	)
-	r1, err = rf.FromBytes([]byte(`apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: my-foo
-spec:
-  bar:
-    B:
-    C: Z
-`))
-	assert.NoError(t, err)
-
-	r2, err = rf.FromBytes([]byte(`apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: my-foo
-spec:
-  bar:
-    C: Z
-    D: W
-  baz:
-    hello: world
-`))
-	assert.NoError(t, err)
-
-	rm, err := rmF.ConflatePatches([]*resource.Resource{r1, r2})
-	assert.NoError(t, err)
-	yml, err = rm.AsYaml()
-	assert.NoError(t, err)
-	assert.Equal(t, `apiVersion: example.com/v1
-kind: Foo
-metadata:
-  name: my-foo
-spec:
-  bar:
-    C: Z
-    D: W
-  baz:
-    hello: world
-`, string(yml))
-}