mirror of https://github.com/k3s-io/k3s
104 lines
2.7 KiB
Go
104 lines
2.7 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 config
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import (
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"errors"
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"fmt"
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"io"
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"github.com/spf13/cobra"
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"k8s.io/client-go/tools/clientcmd"
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clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
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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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useContextExample = templates.Examples(`
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# Use the context for the minikube cluster
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kubectl config use-context minikube`)
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)
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type useContextOptions struct {
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configAccess clientcmd.ConfigAccess
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contextName string
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}
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// NewCmdConfigUseContext returns a Command instance for 'config use-context' sub command
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func NewCmdConfigUseContext(out io.Writer, configAccess clientcmd.ConfigAccess) *cobra.Command {
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options := &useContextOptions{configAccess: configAccess}
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cmd := &cobra.Command{
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Use: "use-context CONTEXT_NAME",
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DisableFlagsInUseLine: true,
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Short: i18n.T("Sets the current-context in a kubeconfig file"),
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Aliases: []string{"use"},
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Long: `Sets the current-context in a kubeconfig file`,
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Example: useContextExample,
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Run: func(cmd *cobra.Command, args []string) {
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cmdutil.CheckErr(options.complete(cmd))
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cmdutil.CheckErr(options.run())
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fmt.Fprintf(out, "Switched to context %q.\n", options.contextName)
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},
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}
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return cmd
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}
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func (o useContextOptions) run() error {
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config, err := o.configAccess.GetStartingConfig()
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if err != nil {
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return err
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}
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err = o.validate(config)
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if err != nil {
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return err
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}
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config.CurrentContext = o.contextName
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return clientcmd.ModifyConfig(o.configAccess, *config, true)
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}
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func (o *useContextOptions) complete(cmd *cobra.Command) error {
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endingArgs := cmd.Flags().Args()
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if len(endingArgs) != 1 {
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return helpErrorf(cmd, "Unexpected args: %v", endingArgs)
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}
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o.contextName = endingArgs[0]
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return nil
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}
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func (o useContextOptions) validate(config *clientcmdapi.Config) error {
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if len(o.contextName) == 0 {
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return errors.New("empty context names are not allowed")
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}
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for name := range config.Contexts {
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if name == o.contextName {
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return nil
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}
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}
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return fmt.Errorf("no context exists with the name: %q", o.contextName)
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}
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