mirror of https://github.com/k3s-io/k3s
99 lines
2.9 KiB
Go
99 lines
2.9 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 apiresources
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import (
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"fmt"
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"sort"
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"github.com/spf13/cobra"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/cli-runtime/pkg/genericclioptions"
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"k8s.io/client-go/discovery"
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cmdutil "k8s.io/kubectl/pkg/cmd/util"
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"k8s.io/kubectl/pkg/util/i18n"
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"k8s.io/kubectl/pkg/util/templates"
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)
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var (
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apiversionsExample = templates.Examples(i18n.T(`
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# Print the supported API versions
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kubectl api-versions`))
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)
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// APIVersionsOptions have the data required for API versions
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type APIVersionsOptions struct {
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discoveryClient discovery.CachedDiscoveryInterface
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genericclioptions.IOStreams
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}
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// NewAPIVersionsOptions creates the options for APIVersions
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func NewAPIVersionsOptions(ioStreams genericclioptions.IOStreams) *APIVersionsOptions {
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return &APIVersionsOptions{
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IOStreams: ioStreams,
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}
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}
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// NewCmdAPIVersions creates the `api-versions` command
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func NewCmdAPIVersions(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
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o := NewAPIVersionsOptions(ioStreams)
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cmd := &cobra.Command{
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Use: "api-versions",
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Short: i18n.T("Print the supported API versions on the server, in the form of \"group/version\""),
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Long: i18n.T("Print the supported API versions on the server, in the form of \"group/version\""),
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Example: apiversionsExample,
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DisableFlagsInUseLine: true,
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Run: func(cmd *cobra.Command, args []string) {
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cmdutil.CheckErr(o.Complete(f, cmd, args))
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cmdutil.CheckErr(o.RunAPIVersions())
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},
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}
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return cmd
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}
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// Complete adapts from the command line args and factory to the data required
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func (o *APIVersionsOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
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if len(args) != 0 {
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return cmdutil.UsageErrorf(cmd, "unexpected arguments: %v", args)
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}
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var err error
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o.discoveryClient, err = f.ToDiscoveryClient()
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if err != nil {
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return err
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}
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return nil
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}
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// RunAPIVersions does the work
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func (o *APIVersionsOptions) RunAPIVersions() error {
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// Always request fresh data from the server
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o.discoveryClient.Invalidate()
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groupList, err := o.discoveryClient.ServerGroups()
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if err != nil {
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return fmt.Errorf("couldn't get available api versions from server: %v", err)
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}
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apiVersions := metav1.ExtractGroupVersions(groupList)
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sort.Strings(apiVersions)
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for _, v := range apiVersions {
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fmt.Fprintln(o.Out, v)
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}
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return nil
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}
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