mirror of https://github.com/kubernetes/kops.git
70 lines
2.0 KiB
Go
70 lines
2.0 KiB
Go
/*
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Copyright 2021 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 kubemanifest
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import (
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"encoding/json"
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"fmt"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/klog/v2"
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"sigs.k8s.io/yaml"
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)
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// KubeObjectToApplyYAML returns the kubernetes object converted to YAML, with "noisy" fields removed.
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//
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// We remove:
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// * status (can't be applied, shouldn't be specified)
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// * metadata.creationTimestamp (can't be applied, shouldn't be specified)
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func KubeObjectToApplyYAML(data runtime.Object) (string, error) {
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// This logic is inlined sigs.k8s.io/yaml.Marshal, but we delete some fields in the middle.
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// Convert the object to JSON bytes
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j, err := json.Marshal(data)
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if err != nil {
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return "", fmt.Errorf("error marshaling into JSON: %v", err)
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}
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// Convert the JSON to a map.
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jsonObj := make(map[string]interface{})
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if err := yaml.Unmarshal(j, &jsonObj); err != nil {
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return "", err
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}
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// Remove status (can't be applied, shouldn't be specified)
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delete(jsonObj, "status")
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// Remove metadata.creationTimestamp (can't be applied, shouldn't be specified)
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metadataObj, found := jsonObj["metadata"]
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if found {
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if metadata, ok := metadataObj.(map[interface{}]interface{}); ok {
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delete(metadata, "creationTimestamp")
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} else {
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klog.Warningf("unexpected type for object metadata: %T", metadataObj)
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}
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} else {
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klog.Warningf("object did not have metadata: %#v", jsonObj)
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}
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// Marshal the cleaned-up map into YAML.
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y, err := yaml.Marshal(jsonObj)
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if err != nil {
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return "", err
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}
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return string(y), nil
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}
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