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- /*
- Copyright 2014 The Kubernetes Authors.
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
- http://www.apache.org/licenses/LICENSE-2.0
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
- package config
- import (
- "errors"
- "fmt"
- "io"
- "github.com/spf13/cobra"
- "k8s.io/client-go/tools/clientcmd"
- clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
- cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
- "k8s.io/kubernetes/pkg/kubectl/util/i18n"
- "k8s.io/kubernetes/pkg/kubectl/util/templates"
- )
- var (
- useContextExample = templates.Examples(`
- # Use the context for the minikube cluster
- kubectl config use-context minikube`)
- )
- type useContextOptions struct {
- configAccess clientcmd.ConfigAccess
- contextName string
- }
- // NewCmdConfigUseContext returns a Command instance for 'config use-context' sub command
- func NewCmdConfigUseContext(out io.Writer, configAccess clientcmd.ConfigAccess) *cobra.Command {
- options := &useContextOptions{configAccess: configAccess}
- cmd := &cobra.Command{
- Use: "use-context CONTEXT_NAME",
- DisableFlagsInUseLine: true,
- Short: i18n.T("Sets the current-context in a kubeconfig file"),
- Aliases: []string{"use"},
- Long: `Sets the current-context in a kubeconfig file`,
- Example: useContextExample,
- Run: func(cmd *cobra.Command, args []string) {
- cmdutil.CheckErr(options.complete(cmd))
- cmdutil.CheckErr(options.run())
- fmt.Fprintf(out, "Switched to context %q.\n", options.contextName)
- },
- }
- return cmd
- }
- func (o useContextOptions) run() error {
- config, err := o.configAccess.GetStartingConfig()
- if err != nil {
- return err
- }
- err = o.validate(config)
- if err != nil {
- return err
- }
- config.CurrentContext = o.contextName
- return clientcmd.ModifyConfig(o.configAccess, *config, true)
- }
- func (o *useContextOptions) complete(cmd *cobra.Command) error {
- endingArgs := cmd.Flags().Args()
- if len(endingArgs) != 1 {
- return helpErrorf(cmd, "Unexpected args: %v", endingArgs)
- }
- o.contextName = endingArgs[0]
- return nil
- }
- func (o useContextOptions) validate(config *clientcmdapi.Config) error {
- if len(o.contextName) == 0 {
- return errors.New("empty context names are not allowed")
- }
- for name := range config.Contexts {
- if name == o.contextName {
- return nil
- }
- }
- return fmt.Errorf("no context exists with the name: %q", o.contextName)
- }
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