111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
/*
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Copyright 2022 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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"fmt"
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"log"
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"os"
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"regexp"
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"strings"
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"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
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"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/install"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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)
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var docSeparatorRegexp = regexp.MustCompile(`\n---`)
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func crdDecoder() runtime.Decoder {
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scheme := runtime.NewScheme()
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install.Install(scheme)
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cf := serializer.NewCodecFactory(scheme)
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return cf.UniversalDecoder()
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}
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func main() {
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logger := log.New(os.Stderr, "", 0)
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if len(os.Args) != 2 && len(os.Args) != 3 {
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logger.Printf("usage (filter all crds): %s <path-to-templated-resources.yaml>", os.Args[0])
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logger.Printf("usage (filter specific crd): %s <path-to-templated-resources.yaml> <name-of-crd>", os.Args[0])
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os.Exit(1)
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}
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filename := os.Args[1]
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var wantedCRDName *string
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if len(os.Args) == 3 {
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val := strings.ToLower(os.Args[2])
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wantedCRDName = &val
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}
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rawYAMLBytes, err := os.ReadFile(filename)
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if err != nil {
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logger.Printf("failed to read %q: %s", filename, err)
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os.Exit(1)
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}
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docs := docSeparatorRegexp.Split(string(rawYAMLBytes), -1)
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decoder := crdDecoder()
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foundAny := false
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for _, doc := range docs {
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obj, _, err := decoder.Decode([]byte(doc), nil, nil)
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if err != nil {
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// could be any kind of resource, just ignore
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continue
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}
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crd, ok := obj.(*apiextensions.CustomResourceDefinition)
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if !ok {
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logger.Printf("doc was parsed without an error but wasn't a CRD, skipping")
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continue
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}
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doc = string(strings.TrimPrefix(doc, "---"))
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doc = string(strings.TrimSpace(doc))
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if wantedCRDName == nil {
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if foundAny {
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fmt.Println("---")
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}
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fmt.Println(doc)
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foundAny = true
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continue
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} else {
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crdName := strings.ToLower(crd.Spec.Names.Plural)
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if crdName == *wantedCRDName {
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fmt.Println(doc)
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return
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}
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}
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}
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if !foundAny {
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if wantedCRDName == nil {
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logger.Printf("couldn't find any CRDs in %q", filename)
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} else {
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logger.Printf("couldn't find a CRD with plural name %q in %q", *wantedCRDName, filename)
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}
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os.Exit(1)
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}
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}
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