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namespace.go
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namespace.go
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package cmd
import (
"fmt"
"github.com/jenkins-x/jx/pkg/kube"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/jenkins-x/jx/pkg/jx/cmd/templates"
meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/clientcmd"
"sort"
"github.com/jenkins-x/jx/pkg/util"
"gopkg.in/AlecAivazis/survey.v1"
"k8s.io/client-go/kubernetes"
)
type NamespaceOptions struct {
*CommonOptions
}
var (
errNoContextDefined = errors.New("there is no context defined in your Kubernetes configuration")
)
var (
namespace_long = templates.LongDesc(`
Displays or changes the current namespace.`)
namespace_example = templates.Examples(`
# view the current namespace
jx ns -b
# to select the namespace to switch to
jx ns
# Change the current namespace to 'cheese'
jx ns cheese`)
)
func NewCmdNamespace(commonOpts *CommonOptions) *cobra.Command {
options := &NamespaceOptions{
CommonOptions: commonOpts,
}
cmd := &cobra.Command{
Use: "namespace",
Aliases: []string{"ns"},
Short: "View or change the current namespace context in the current Kubernetes cluster",
Long: namespace_long,
Example: namespace_example,
Run: func(cmd *cobra.Command, args []string) {
options.Cmd = cmd
options.Args = args
err := options.Run()
CheckErr(err)
},
}
return cmd
}
func (o *NamespaceOptions) Run() error {
config, po, err := o.Kube().LoadConfig()
if err != nil {
return errors.Wrap(err, "loading Kubernetes configuration")
}
ns := ""
args := o.Args
if len(args) > 0 {
ns = args[0]
}
client, err := o.KubeClient()
if err != nil {
return errors.Wrap(err, "creating kubernetes client")
}
names, err := GetNamespaceNames(client)
if err != nil {
return errors.Wrap(err, "retrieving the names of the namespaces")
}
currentNS := kube.CurrentNamespace(config)
if ns == "" && !o.BatchMode {
defaultNamespace := ""
ctx := kube.CurrentContext(config)
if ctx != nil {
defaultNamespace = currentNS
}
pick, err := o.PickNamespace(names, defaultNamespace)
if err != nil {
return errors.Wrap(err, "picking the namespace")
}
ns = pick
}
info := util.ColorInfo
if ns != "" && ns != currentNS {
_, err = client.CoreV1().Namespaces().Get(ns, meta_v1.GetOptions{})
if err != nil {
return errors.Wrapf(err, "getting namespace %q", ns)
}
newConfig := *config
ctx := kube.CurrentContext(config)
if ctx == nil {
return errNoContextDefined
}
if ctx.Namespace == ns {
return nil
}
ctx.Namespace = ns
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
}
// GetNamespaceNames returns the sorted list of environment names
func GetNamespaceNames(client kubernetes.Interface) ([]string, error) {
names := []string{}
list, err := client.CoreV1().Namespaces().List(meta_v1.ListOptions{})
if err != nil {
return names, fmt.Errorf("loading namespaces %s", err)
}
for _, n := range list.Items {
names = append(names, n.Name)
}
sort.Strings(names)
return names, nil
}
func (o *NamespaceOptions) PickNamespace(names []string, defaultNamespace string) (string, error) {
if len(names) == 0 {
return "", nil
}
if len(names) == 1 {
return names[0], nil
}
name := ""
prompt := &survey.Select{
Message: "Change namespace:",
Options: names,
Default: defaultNamespace,
}
surveyOpts := survey.WithStdio(o.In, o.Out, o.Err)
err := survey.AskOne(prompt, &name, nil, surveyOpts)
return name, err
}