138 lines
3.3 KiB
Go
138 lines
3.3 KiB
Go
/*
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Copyright 2020 The cert-manager 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 main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"strings"
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"gopkg.in/yaml.v2"
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)
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var removeKeys = []string{}
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func main() {
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loadVariant()
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if len(flag.Args()) < 1 {
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log.Fatal("Usage: filter-crd <CRD YAML file>")
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}
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f, err := os.Open(flag.Args()[0])
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if err != nil {
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log.Fatal("Error opening file: ", err)
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}
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decoder := yaml.NewDecoder(f)
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var d map[interface{}]interface{}
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output := []string{}
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for decoder.Decode(&d) == nil {
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if len(d) == 0 {
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continue
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}
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checkChain(d, []string{})
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fileOut, err := yaml.Marshal(d)
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if err != nil {
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log.Fatal("Error marshaling output: ", err)
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}
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output = append(output, string(fileOut))
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d = map[interface{}]interface{}{} // clean out the old, otherwise the decoder will merge keys
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}
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fmt.Println(strings.Join(output, "---\n"))
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}
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func checkChain(d map[interface{}]interface{}, chain []string) {
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for k, v := range d {
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if key, ok := k.(string); ok {
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chain = append(chain, key)
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// check if keys need to be removed
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for _, removeKey := range removeKeys {
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if strings.Join(chain, "/") == removeKey {
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delete(d, key)
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}
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}
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if value, ok := v.(map[interface{}]interface{}); ok {
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checkChain(value, chain)
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}
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if value, ok := v.([]interface{}); ok {
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d[k] = checkSliceChain(value, append(chain, "[]"))
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}
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chain = chain[:len(chain)-1] // we're done with this key, remove it from the chain
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}
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}
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}
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func checkSliceChain(s []interface{}, chain []string) []interface{} {
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for _, sliceVal := range s {
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if d, ok := sliceVal.(map[interface{}]interface{}); ok {
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for k, v := range d {
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if key, ok := k.(string); ok {
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chain = append(chain, key)
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// check if keys need to be removed
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for _, removeKey := range removeKeys {
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if strings.Join(chain, "/") == removeKey {
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delete(d, key)
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}
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}
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if value, ok := v.(map[interface{}]interface{}); ok {
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checkChain(value, chain)
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}
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if value, ok := v.([]interface{}); ok {
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d[k] = checkSliceChain(value, append(chain, "[]"))
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}
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chain = chain[:len(chain)-1] // we're done with this key, remove it from the chain
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}
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}
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}
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}
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return s
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}
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func loadVariant() {
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variant := ""
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flag.StringVar(&variant, "variant", "", "variant of remove rules")
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flag.Parse()
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// filter-crd is also able to be used without variant which should produce the same output again
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// this section used to have multiple variants for legacy releases, this has been removed now
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// TODO: ultimately we should find a we should find a way to remove the Helm specific labels
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// without using this hack
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if variant == "no-helm" {
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removeKeys = []string{
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"metadata/labels/app.kubernetes.io/managed-by",
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"metadata/labels/helm.sh/chart",
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"spec/template/metadata/labels/app.kubernetes.io/managed-by",
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"spec/template/metadata/labels/helm.sh/chart",
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}
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}
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}
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