/
PatchTransformer.go
150 lines (137 loc) · 3.37 KB
/
PatchTransformer.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
//go:generate pluginator
package main
import (
"fmt"
"github.com/evanphx/json-patch"
"github.com/pkg/errors"
"sigs.k8s.io/kustomize/v3/pkg/ifc"
"sigs.k8s.io/kustomize/v3/pkg/resmap"
"sigs.k8s.io/kustomize/v3/pkg/resource"
"sigs.k8s.io/kustomize/v3/pkg/types"
"sigs.k8s.io/yaml"
)
type plugin struct {
ldr ifc.Loader
rf *resmap.Factory
loadedPatch *resource.Resource
decodedPatch jsonpatch.Patch
Path string `json:"path,omitempty" yaml:"path,omitempty"`
Patch string `json:"patch,omitempty" yaml:"patch,omitempty"`
Target *types.Selector `json:"target,omitempty" yaml:"target,omitempty"`
}
//noinspection GoUnusedGlobalVariable
var KustomizePlugin plugin
func (p *plugin) Config(
ldr ifc.Loader, rf *resmap.Factory, c []byte) (err error) {
p.ldr = ldr
p.rf = rf
err = yaml.Unmarshal(c, p)
if err != nil {
return err
}
if p.Patch == "" && p.Path == "" {
err = fmt.Errorf(
"must specify one of patch and path in\n%s", string(c))
return
}
if p.Patch != "" && p.Path != "" {
err = fmt.Errorf(
"patch and path can't be set at the same time\n%s", string(c))
return
}
var in []byte
if p.Path != "" {
in, err = ldr.Load(p.Path)
if err != nil {
return
}
}
if p.Patch != "" {
in = []byte(p.Patch)
}
patchSM, errSM := p.rf.RF().FromBytes(in)
patchJson, errJson := jsonPatchFromBytes(in)
if errSM != nil && errJson != nil {
err = fmt.Errorf(
"unable to get either a Strategic Merge Patch or JSON patch 6902 from %s", p.Patch)
return
}
if errSM == nil && errJson != nil {
p.loadedPatch = patchSM
}
if errJson == nil && errSM != nil {
p.decodedPatch = patchJson
}
if patchSM != nil && patchJson != nil {
err = fmt.Errorf(
"a patch can't be both a Strategic Merge Patch and JSON patch 6902 %s", p.Patch)
}
return nil
}
func (p *plugin) Transform(m resmap.ResMap) error {
if p.loadedPatch != nil && p.Target == nil {
target, err := m.GetById(p.loadedPatch.OrgId())
if err != nil {
return err
}
err = target.Patch(p.loadedPatch.Kunstructured)
if err != nil {
return err
}
return nil
}
if p.Target == nil {
return fmt.Errorf("must specify a target for patch %s", p.Patch)
}
resources, err := m.Select(*p.Target)
if err != nil {
return err
}
for _, res := range resources {
if p.decodedPatch != nil {
rawObj, err := res.MarshalJSON()
if err != nil {
return err
}
modifiedObj, err := p.decodedPatch.Apply(rawObj)
if err != nil {
return errors.Wrapf(
err, "failed to apply json patch '%s'", p.Patch)
}
err = res.UnmarshalJSON(modifiedObj)
if err != nil {
return err
}
}
if p.loadedPatch != nil {
patchCopy := p.loadedPatch.DeepCopy()
patchCopy.SetName(res.GetName())
patchCopy.SetNamespace(res.GetNamespace())
patchCopy.SetGvk(res.GetGvk())
err = res.Patch(patchCopy.Kunstructured)
if err != nil {
return err
}
}
}
return nil
}
// jsonPatchFromBytes loads a Json 6902 patch from
// a bytes input
func jsonPatchFromBytes(
in []byte) (jsonpatch.Patch, error) {
ops := string(in)
if ops == "" {
return nil, fmt.Errorf("empty json patch operations")
}
if ops[0] != '[' {
jsonOps, err := yaml.YAMLToJSON(in)
if err != nil {
return nil, err
}
ops = string(jsonOps)
}
return jsonpatch.DecodePatch([]byte(ops))
}