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context.go
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context.go
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package cmd
import (
"fmt"
"io"
"github.com/spf13/cobra"
"github.com/jenkins-x/jx/pkg/jx/cmd/templates"
cmdutil "github.com/jenkins-x/jx/pkg/jx/cmd/util"
"github.com/jenkins-x/jx/pkg/kube"
"k8s.io/client-go/tools/clientcmd"
"sort"
"github.com/jenkins-x/jx/pkg/util"
"gopkg.in/AlecAivazis/survey.v1"
)
type ContextOptions struct {
CommonOptions
}
var (
context_long = templates.LongDesc(`
Displays or changes the current kubernetes context (cluster).`)
context_example = templates.Examples(`
# to select the context to switch to
jx context
# or the more concise alias
jx ctx
# view the current context
jx ctx -b
# Change the current namespace to 'minikube'
jx ctx minikube`)
)
func NewCmdContext(f cmdutil.Factory, out io.Writer, errOut io.Writer) *cobra.Command {
options := &ContextOptions{
CommonOptions: CommonOptions{
Factory: f,
Out: out,
Err: errOut,
},
}
cmd := &cobra.Command{
Use: "context",
Aliases: []string{"ctx"},
Short: "View or change the current kubernetes context (kubernetes cluster)",
Long: context_long,
Example: context_example,
Run: func(cmd *cobra.Command, args []string) {
options.Cmd = cmd
options.Args = args
err := options.Run()
cmdutil.CheckErr(err)
},
}
options.addCommonFlags(cmd)
return cmd
}
func (o *ContextOptions) Run() error {
config, po, err := kube.LoadConfig()
if err != nil {
return err
}
if config == nil || config.Contexts == nil || len(config.Contexts) == 0 {
return fmt.Errorf("No kubernetes contexts available! Try create or connect to cluster?")
}
contextNames := []string{}
for k, v := range config.Contexts {
if k != "" && v != nil {
contextNames = append(contextNames, k)
}
}
sort.Strings(contextNames)
ctxName := ""
args := o.Args
if len(args) > 0 {
ctxName = args[0]
if util.StringArrayIndex(contextNames, ctxName) < 0 {
return util.InvalidArg(ctxName, contextNames)
}
}
if ctxName == "" && !o.BatchMode {
defaultCtxName := config.CurrentContext
pick, err := o.PickContext(contextNames, defaultCtxName)
if err != nil {
return err
}
ctxName = pick
}
info := util.ColorInfo
if ctxName != "" && ctxName != config.CurrentContext {
ctx := config.Contexts[ctxName]
if ctx == nil {
return fmt.Errorf("Could not find kubernetes context %s", ctxName)
}
newConfig := *config
newConfig.CurrentContext = ctxName
err = clientcmd.ModifyConfig(po, newConfig, false)
if err != nil {
return fmt.Errorf("Failed to update the kube config %s", err)
}
fmt.Fprintf(o.Out, "Now using namespace '%s' on server '%s'.\n", info(ctx.Namespace), info(kube.Server(config, ctx)))
} else {
ns := kube.CurrentNamespace(config)
server := kube.CurrentServer(config)
fmt.Fprintf(o.Out, "Using namespace '%s' from context named '%s' on server '%s'.\n", info(ns), info(config.CurrentContext), info(server))
}
return nil
}
func (o *ContextOptions) PickContext(names []string, defaultValue string) (string, error) {
if len(names) == 0 {
return "", nil
}
if len(names) == 1 {
return names[0], nil
}
name := ""
prompt := &survey.Select{
Message: "Change kubernetes context:",
Options: names,
Default: defaultValue,
}
err := survey.AskOne(prompt, &name, nil)
return name, err
}