Remove dead merge conflict code.

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))
-}

api/resmap/merginator.go

@@ -1,123 +0,0 @@
-// Copyright 2020 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package resmap
-
-import (
-	"fmt"
-
-	"sigs.k8s.io/kustomize/api/resource"
-)
-
-// merginator coordinates merging the resources in incoming to the result.
-type merginator struct {
-	incoming []*resource.Resource
-	cdf      resource.ConflictDetectorFactory
-	result   ResMap
-}
-
-func (m *merginator) ConflatePatches(in []*resource.Resource) (ResMap, error) {
-	m.result = New()
-	m.incoming = in
-	for index := range m.incoming {
-		alreadyInResult, err := m.appendIfNoMatch(index)
-		if err != nil {
-			return nil, err
-		}
-		if alreadyInResult != nil {
-			// The resource at index has the same resId as a previously
-			// considered resource.
-			//
-			// If they conflict with each other (e.g. they both want to change
-			// the image name in a Deployment, but to different values),
-			// return an error.
-			//
-			// If they don't conflict, then merge them into a single resource,
-			// since they both target the same item, and we want cumulative
-			// behavior. E.g. say both patches modify a map.  Without a merge,
-			// the last patch wins, replacing the entire map.
-			err = m.mergeWithExisting(index, alreadyInResult)
-			if err != nil {
-				return nil, err
-			}
-		}
-	}
-	return m.result, nil
-}
-
-func (m *merginator) appendIfNoMatch(index int) (*resource.Resource, error) {
-	candidate := m.incoming[index]
-	matchedResources := m.result.GetMatchingResourcesByAnyId(
-		candidate.OrgId().Equals)
-	if len(matchedResources) == 0 {
-		m.result.Append(candidate)
-		return nil, nil
-	}
-	if len(matchedResources) > 1 {
-		return nil, fmt.Errorf("multiple resources targeted by patch")
-	}
-	return matchedResources[0], nil
-}
-
-func (m *merginator) mergeWithExisting(
-	index int, alreadyInResult *resource.Resource) error {
-	candidate := m.incoming[index]
-	cd, err := m.cdf.New(candidate.OrgId().Gvk)
-	if err != nil {
-		return err
-	}
-	hasConflict, err := cd.HasConflict(candidate, alreadyInResult)
-	if err != nil {
-		return err
-	}
-	if hasConflict {
-		return m.makeError(cd, index)
-	}
-	merged, err := cd.MergePatches(alreadyInResult, candidate)
-	if err != nil {
-		return err
-	}
-	_, err = m.result.Replace(merged)
-	return err
-}
-
-// Make an error message describing the conflict.
-func (m *merginator) makeError(cd resource.ConflictDetector, index int) error {
-	conflict, err := m.findConflict(cd, index)
-	if err != nil {
-		return err
-	}
-	if conflict == nil {
-		return fmt.Errorf("expected conflict for %s", m.incoming[index].OrgId())
-	}
-	conflictMap, _ := conflict.Map()
-	incomingIndexMap, _ := m.incoming[index].Map()
-	return fmt.Errorf(
-		"conflict between %#v at index %d and %#v",
-		incomingIndexMap,
-		index,
-		conflictMap,
-	)
-}
-
-// findConflict looks for a conflict in a resource slice.
-// It returns the first conflict between the resource at index
-// and some other resource.  Two resources can only conflict if
-// they have the same original ResId.
-func (m *merginator) findConflict(
-	cd resource.ConflictDetector, index int) (*resource.Resource, error) {
-	targetId := m.incoming[index].OrgId()
-	for i, p := range m.incoming {
-		if i == index || !targetId.Equals(p.OrgId()) {
-			continue
-		}
-		conflict, err := cd.HasConflict(p, m.incoming[index])
-		if err != nil {
-			return nil, err
-		}
-		if conflict {
-			return p, nil
-		}
-	}
-	return nil, nil
-}

api/resmap/reswrangler_test.go

@@ -21,7 +21,7 @@ import (
 
 var depProvider = provider.NewDefaultDepProvider()
 var rf = depProvider.GetResourceFactory()
-var rmF = NewFactory(rf, depProvider.GetConflictDetectorFactory())
+var rmF = NewFactory(rf)
 
 func doAppend(t *testing.T, w ResMap, r *resource.Resource) {
 	err := w.Append(r)