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conflictdetectorsm.go
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conflictdetectorsm.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package conflict
import (
"fmt"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"sigs.k8s.io/kustomize/api/resource"
)
// conflictDetectorSm detects conflicts in a list of strategic merge patches.
type conflictDetectorSm struct {
lookupPatchMeta strategicpatch.LookupPatchMeta
resourceFactory *resource.Factory
}
var _ resource.ConflictDetector = &conflictDetectorSm{}
func (cd *conflictDetectorSm) HasConflict(
p1, p2 *resource.Resource) (bool, error) {
return strategicpatch.MergingMapsHaveConflicts(
p1.Map(), p2.Map(), cd.lookupPatchMeta)
}
func (cd *conflictDetectorSm) MergePatches(
patch1, patch2 *resource.Resource) (*resource.Resource, error) {
if cd.hasDeleteDirectiveMarker(patch2.Map()) {
if cd.hasDeleteDirectiveMarker(patch1.Map()) {
return nil, fmt.Errorf(
"cannot merge patches both containing '$patch: delete' directives")
}
patch1, patch2 = patch2, patch1
}
mergedMap, err := strategicpatch.MergeStrategicMergeMapPatchUsingLookupPatchMeta(
cd.lookupPatchMeta, patch1.Map(), patch2.Map())
return cd.resourceFactory.FromMap(mergedMap), err
}
func (cd *conflictDetectorSm) hasDeleteDirectiveMarker(
patch map[string]interface{}) bool {
if v, ok := patch["$patch"]; ok && v == "delete" {
return true
}
for _, v := range patch {
switch typedV := v.(type) {
case map[string]interface{}:
if cd.hasDeleteDirectiveMarker(typedV) {
return true
}
case []interface{}:
for _, sv := range typedV {
typedE, ok := sv.(map[string]interface{})
if !ok {
break
}
if cd.hasDeleteDirectiveMarker(typedE) {
return true
}
}
}
}
return false
}