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761fdeacaa
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Make kubectl explain print the Kind and APIVersion of the resource **What this PR does / why we need it**: Kubectl explain currently doesn't print out the Kind and APIversion of the resource being explained. When running `kubectl explain hpa.spec`, for example, there is no way of knowing whether you're looking at the `autoscaling/v1` or the `autoscaling/v2beta1` version. Also, `kubectl explain` is often used as a reference when writing YAML/JSON object manifests. It allows you to look up everything except the API version. Currently, you either need to know the API Version of a resource by heart or look it up in the online API docs. This PR fixes both problems by having `kubectl explain` print out the full Kind and APIVersion of the resource it is explaining. Here are a few examples of the new output: ``` $ kubectl explain deploy KIND: Deployment VERSION: extensions/v1beta1 DESCRIPTION: ... $ kubectl explain hpa.spec KIND: HorizontalPodAutoscaler VERSION: autoscaling/v1 RESOURCE: spec <Object> DESCRIPTION: ... $ kubectl explain hpa.spec.maxReplicas KIND: HorizontalPodAutoscaler VERSION: autoscaling/v1 FIELD: maxReplicas <integer> DESCRIPTION: ... $ kubectl explain hpa.spec --recursive KIND: HorizontalPodAutoscaler VERSION: autoscaling/v1 RESOURCE: spec <Object> DESCRIPTION: behaviour of autoscaler. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status. specification of a horizontal pod autoscaler. FIELDS: maxReplicas <integer> minReplicas <integer> scaleTargetRef <Object> apiVersion <string> kind <string> name <string> targetCPUUtilizationPercentage <integer> ``` **Release note**: ```release-note Kubectl explain now prints out the Kind and API version of the resource being explained ```
70 lines
2.1 KiB
Go
70 lines
2.1 KiB
Go
/*
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Copyright 2017 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 explain
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import (
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"io"
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"strings"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/kube-openapi/pkg/util/proto"
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)
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type fieldsPrinter interface {
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PrintFields(proto.Schema) error
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}
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func splitDotNotation(model string) (string, []string) {
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var fieldsPath []string
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// ignore trailing period
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model = strings.TrimSuffix(model, ".")
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dotModel := strings.Split(model, ".")
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if len(dotModel) >= 1 {
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fieldsPath = dotModel[1:]
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}
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return dotModel[0], fieldsPath
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}
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// SplitAndParseResourceRequest separates the users input into a model and fields
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func SplitAndParseResourceRequest(inResource string, mapper meta.RESTMapper) (string, []string, error) {
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inResource, fieldsPath := splitDotNotation(inResource)
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inResource, _ = mapper.ResourceSingularizer(inResource)
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return inResource, fieldsPath, nil
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}
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// PrintModelDescription prints the description of a specific model or dot path.
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// If recursive, all components nested within the fields of the schema will be
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// printed.
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func PrintModelDescription(fieldsPath []string, w io.Writer, schema proto.Schema, gvk schema.GroupVersionKind, recursive bool) error {
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fieldName := ""
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if len(fieldsPath) != 0 {
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fieldName = fieldsPath[len(fieldsPath)-1]
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}
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// Go down the fieldsPath to find what we're trying to explain
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schema, err := LookupSchemaForField(schema, fieldsPath)
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if err != nil {
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return err
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}
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b := fieldsPrinterBuilder{Recursive: recursive}
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f := &Formatter{Writer: w, Wrap: 80}
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return PrintModel(fieldName, f, b, schema, gvk)
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}
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