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