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transformer.go
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transformer.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package patch
import (
"encoding/json"
"fmt"
"github.com/evanphx/json-patch"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/client-go/kubernetes/scheme"
"sigs.k8s.io/kustomize/v3/pkg/gvk"
"sigs.k8s.io/kustomize/v3/pkg/resid"
"sigs.k8s.io/kustomize/v3/pkg/resmap"
"sigs.k8s.io/kustomize/v3/pkg/resource"
"sigs.k8s.io/kustomize/v3/pkg/transformers"
)
// transformer applies strategic merge patches.
type transformer struct {
patches []*resource.Resource
rf *resource.Factory
}
var _ transformers.Transformer = &transformer{}
// NewTransformer constructs a strategic merge patch transformer.
func NewTransformer(
slice []*resource.Resource, rf *resource.Factory) (transformers.Transformer, error) {
if len(slice) == 0 {
return transformers.NewNoOpTransformer(), nil
}
return &transformer{patches: slice, rf: rf}, nil
}
// Transform apply the patches on top of the base resources.
// nolint:ineffassign
func (tf *transformer) Transform(m resmap.ResMap) error {
patches, err := tf.mergePatches()
if err != nil {
return err
}
for _, patch := range patches.Resources() {
target, err := tf.findPatchTarget(m, patch.OrgId())
if err != nil {
return err
}
merged := map[string]interface{}{}
versionedObj, err := scheme.Scheme.New(
toSchemaGvk(patch.OrgId().Gvk))
saveName := target.GetName()
switch {
case runtime.IsNotRegisteredError(err):
// Use JSON merge patch to handle types w/o schema
baseBytes, err := json.Marshal(target.Map())
if err != nil {
return err
}
patchBytes, err := json.Marshal(patch.Map())
if err != nil {
return err
}
mergedBytes, err := jsonpatch.MergePatch(baseBytes, patchBytes)
if err != nil {
return err
}
err = json.Unmarshal(mergedBytes, &merged)
if err != nil {
return err
}
case err != nil:
return err
default:
// Use Strategic-Merge-Patch to handle types w/ schema
// TODO: Change this to use the new Merge package.
// Store the name of the target object, because this name may have been munged.
// Apply this name to the patched object.
lookupPatchMeta, err := strategicpatch.NewPatchMetaFromStruct(versionedObj)
if err != nil {
return err
}
merged, err = strategicpatch.StrategicMergeMapPatchUsingLookupPatchMeta(
target.Map(),
patch.Map(),
lookupPatchMeta)
if err != nil {
return err
}
}
target.SetMap(merged)
target.SetName(saveName)
}
return nil
}
func (tf *transformer) findPatchTarget(
m resmap.ResMap, id resid.ResId) (*resource.Resource, error) {
match, err := m.GetByOriginalId(id)
if err == nil {
return match, nil
}
match, err = m.GetByCurrentId(id)
if err == nil {
return match, nil
}
return nil, fmt.Errorf(
"failed to find target for patch %s", id.GvknString())
}
// mergePatches merge and index patches by OrgId.
// It errors out if there is conflict between patches.
func (tf *transformer) mergePatches() (resmap.ResMap, error) {
rc := resmap.New()
for ix, patch := range tf.patches {
id := patch.OrgId()
existing := rc.GetMatchingResourcesByOriginalId(id.GvknEquals)
if len(existing) == 0 {
rc.Append(patch)
continue
}
if len(existing) > 1 {
return nil, fmt.Errorf("self conflict in patches")
}
versionedObj, err := scheme.Scheme.New(toSchemaGvk(id.Gvk))
if err != nil && !runtime.IsNotRegisteredError(err) {
return nil, err
}
var cd conflictDetector
if err != nil {
cd = newJMPConflictDetector(tf.rf)
} else {
cd, err = newSMPConflictDetector(versionedObj, tf.rf)
if err != nil {
return nil, err
}
}
conflict, err := cd.hasConflict(existing[0], patch)
if err != nil {
return nil, err
}
if conflict {
conflictingPatch, err := cd.findConflict(ix, tf.patches)
if err != nil {
return nil, err
}
return nil, fmt.Errorf(
"conflict between %#v and %#v",
conflictingPatch.Map(), patch.Map())
}
merged, err := cd.mergePatches(existing[0], patch)
if err != nil {
return nil, err
}
rc.Replace(merged)
}
return rc, nil
}
// toSchemaGvk converts to a schema.GroupVersionKind.
func toSchemaGvk(x gvk.Gvk) schema.GroupVersionKind {
return schema.GroupVersionKind{
Group: x.Group,
Version: x.Version,
Kind: x.Kind,
}
}