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- /*
- Copyright 2018 The Kubernetes Authors.
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
- http://www.apache.org/licenses/LICENSE-2.0
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
- package transformer
- import (
- "fmt"
- "github.com/evanphx/json-patch"
- "github.com/ghodss/yaml"
- "github.com/pkg/errors"
- "sigs.k8s.io/kustomize/pkg/resid"
- "sigs.k8s.io/kustomize/pkg/resmap"
- "sigs.k8s.io/kustomize/pkg/resource"
- "sigs.k8s.io/kustomize/pkg/transformers"
- )
- // patchJson6902JSONTransformer applies patches.
- type patchJson6902JSONTransformer struct {
- target resid.ResId
- patch jsonpatch.Patch
- rawOp []byte
- }
- var _ transformers.Transformer = &patchJson6902JSONTransformer{}
- // newPatchJson6902JSONTransformer constructs a PatchJson6902 transformer.
- func newPatchJson6902JSONTransformer(
- id resid.ResId, rawOp []byte) (transformers.Transformer, error) {
- op := rawOp
- var err error
- if !isJsonFormat(op) {
- // if it isn't JSON, try to parse it as YAML
- op, err = yaml.YAMLToJSON(rawOp)
- if err != nil {
- return nil, err
- }
- }
- decodedPatch, err := jsonpatch.DecodePatch(op)
- if err != nil {
- return nil, err
- }
- if len(decodedPatch) == 0 {
- return transformers.NewNoOpTransformer(), nil
- }
- return &patchJson6902JSONTransformer{target: id, patch: decodedPatch, rawOp: rawOp}, nil
- }
- // Transform apply the json patches on top of the base resources.
- func (t *patchJson6902JSONTransformer) Transform(m resmap.ResMap) error {
- obj, err := t.findTargetObj(m)
- if err != nil {
- return err
- }
- rawObj, err := obj.MarshalJSON()
- if err != nil {
- return err
- }
- modifiedObj, err := t.patch.Apply(rawObj)
- if err != nil {
- return errors.Wrapf(err, "failed to apply json patch '%s'", string(t.rawOp))
- }
- err = obj.UnmarshalJSON(modifiedObj)
- if err != nil {
- return err
- }
- return nil
- }
- func (t *patchJson6902JSONTransformer) findTargetObj(
- m resmap.ResMap) (*resource.Resource, error) {
- var matched []resid.ResId
- // TODO(monopole): namespace bug in json patch?
- // Since introduction in PR #300
- // (see pkg/patch/transformer/util.go),
- // this code has treated an empty namespace like a wildcard
- // rather than like an additional restriction to match
- // only the empty namespace. No test coverage to confirm.
- // Not sure if desired, keeping it for now.
- if t.target.Namespace() != "" {
- matched = m.GetMatchingIds(t.target.NsGvknEquals)
- } else {
- matched = m.GetMatchingIds(t.target.GvknEquals)
- }
- if len(matched) == 0 {
- return nil, fmt.Errorf(
- "couldn't find target %v for json patch", t.target)
- }
- if len(matched) > 1 {
- return nil, fmt.Errorf(
- "found multiple targets %v matching %v for json patch",
- matched, t.target)
- }
- return m[matched[0]], nil
- }
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