mirror of https://github.com/k3s-io/k3s
109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package transformer
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import (
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"fmt"
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"github.com/evanphx/json-patch"
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"github.com/ghodss/yaml"
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"github.com/pkg/errors"
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"sigs.k8s.io/kustomize/pkg/resid"
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"sigs.k8s.io/kustomize/pkg/resmap"
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"sigs.k8s.io/kustomize/pkg/resource"
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"sigs.k8s.io/kustomize/pkg/transformers"
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)
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// patchJson6902JSONTransformer applies patches.
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type patchJson6902JSONTransformer struct {
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target resid.ResId
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patch jsonpatch.Patch
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rawOp []byte
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}
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var _ transformers.Transformer = &patchJson6902JSONTransformer{}
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// newPatchJson6902JSONTransformer constructs a PatchJson6902 transformer.
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func newPatchJson6902JSONTransformer(
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id resid.ResId, rawOp []byte) (transformers.Transformer, error) {
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op := rawOp
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var err error
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if !isJsonFormat(op) {
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// if it isn't JSON, try to parse it as YAML
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op, err = yaml.YAMLToJSON(rawOp)
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if err != nil {
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return nil, err
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}
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}
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decodedPatch, err := jsonpatch.DecodePatch(op)
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if err != nil {
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return nil, err
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}
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if len(decodedPatch) == 0 {
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return transformers.NewNoOpTransformer(), nil
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}
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return &patchJson6902JSONTransformer{target: id, patch: decodedPatch, rawOp: rawOp}, nil
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}
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// Transform apply the json patches on top of the base resources.
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func (t *patchJson6902JSONTransformer) Transform(m resmap.ResMap) error {
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obj, err := t.findTargetObj(m)
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if err != nil {
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return err
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}
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rawObj, err := obj.MarshalJSON()
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if err != nil {
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return err
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}
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modifiedObj, err := t.patch.Apply(rawObj)
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if err != nil {
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return errors.Wrapf(err, "failed to apply json patch '%s'", string(t.rawOp))
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}
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err = obj.UnmarshalJSON(modifiedObj)
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if err != nil {
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return err
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}
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return nil
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}
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func (t *patchJson6902JSONTransformer) findTargetObj(
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m resmap.ResMap) (*resource.Resource, error) {
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var matched []resid.ResId
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// TODO(monopole): namespace bug in json patch?
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// Since introduction in PR #300
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// (see pkg/patch/transformer/util.go),
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// this code has treated an empty namespace like a wildcard
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// rather than like an additional restriction to match
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// only the empty namespace. No test coverage to confirm.
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// Not sure if desired, keeping it for now.
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if t.target.Namespace() != "" {
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matched = m.GetMatchingIds(t.target.NsGvknEquals)
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} else {
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matched = m.GetMatchingIds(t.target.GvknEquals)
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}
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if len(matched) == 0 {
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return nil, fmt.Errorf(
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"couldn't find target %v for json patch", t.target)
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}
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if len(matched) > 1 {
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return nil, fmt.Errorf(
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"found multiple targets %v matching %v for json patch",
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matched, t.target)
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}
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return m[matched[0]], nil
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}
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