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120 lines
3.5 KiB
Go
120 lines
3.5 KiB
Go
/*
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Copyright 2014 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 cmd
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import (
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"fmt"
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"io"
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"github.com/renstrom/dedent"
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"github.com/spf13/cobra"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/apimachinery/registered"
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"k8s.io/kubernetes/pkg/kubectl"
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cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
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)
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var (
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explainExamples = dedent.Dedent(`
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# Get the documentation of the resource and its fields
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kubectl explain pods
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# Get the documentation of a specific field of a resource
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kubectl explain pods.spec.containers`)
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explainLong = dedent.Dedent(`
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Documentation of resources.
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`) + valid_resources
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)
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// NewCmdExplain returns a cobra command for swagger docs
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func NewCmdExplain(f *cmdutil.Factory, out, cmdErr io.Writer) *cobra.Command {
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cmd := &cobra.Command{
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Use: "explain RESOURCE",
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Short: "Documentation of resources",
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Long: explainLong,
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Example: explainExamples,
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Run: func(cmd *cobra.Command, args []string) {
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err := RunExplain(f, out, cmdErr, cmd, args)
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cmdutil.CheckErr(err)
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},
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}
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cmd.Flags().Bool("recursive", false, "Print the fields of fields (Currently only 1 level deep)")
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cmdutil.AddInclude3rdPartyFlags(cmd)
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return cmd
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}
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// RunExplain executes the appropriate steps to print a model's documentation
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func RunExplain(f *cmdutil.Factory, out, cmdErr io.Writer, cmd *cobra.Command, args []string) error {
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if len(args) == 0 {
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fmt.Fprint(cmdErr, "You must specify the type of resource to explain. ", valid_resources)
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return cmdutil.UsageError(cmd, "Required resource not specified.")
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}
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if len(args) > 1 {
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return cmdutil.UsageError(cmd, "We accept only this format: explain RESOURCE")
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}
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recursive := cmdutil.GetFlagBool(cmd, "recursive")
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apiVersionString := cmdutil.GetFlagString(cmd, "api-version")
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apiVersion := unversioned.GroupVersion{}
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mapper, _ := f.Object()
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// TODO: After we figured out the new syntax to separate group and resource, allow
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// the users to use it in explain (kubectl explain <group><syntax><resource>).
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// Refer to issue #16039 for why we do this. Refer to PR #15808 that used "/" syntax.
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inModel, fieldsPath, err := kubectl.SplitAndParseResourceRequest(args[0], mapper)
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if err != nil {
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return err
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}
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// TODO: We should deduce the group for a resource by discovering the supported resources at server.
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fullySpecifiedGVR, groupResource := unversioned.ParseResourceArg(inModel)
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gvk := unversioned.GroupVersionKind{}
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if fullySpecifiedGVR != nil {
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gvk, _ = mapper.KindFor(*fullySpecifiedGVR)
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}
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if gvk.Empty() {
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gvk, err = mapper.KindFor(groupResource.WithVersion(""))
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if err != nil {
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return err
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}
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}
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if len(apiVersionString) == 0 {
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groupMeta, err := registered.Group(gvk.Group)
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if err != nil {
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return err
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}
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apiVersion = groupMeta.GroupVersion
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} else {
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apiVersion, err = unversioned.ParseGroupVersion(apiVersionString)
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if err != nil {
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return nil
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}
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}
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schema, err := f.SwaggerSchema(apiVersion.WithKind(gvk.Kind))
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if err != nil {
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return err
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}
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return kubectl.PrintModelDescription(inModel, fieldsPath, out, schema, recursive)
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}
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