mirror of
https://github.com/ahmetb/kubectx.git
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b5daf2cef7
* feat(kubens): added force flag to switch namespaces even if it doesn't exist * Merged lines * fixed README.md and flags.go * updated flags.go, flags_test.go
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// Copyright 2021 Google LLC
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"context"
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"io"
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"os"
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"github.com/pkg/errors"
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errors2 "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"github.com/ahmetb/kubectx/internal/kubeconfig"
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"github.com/ahmetb/kubectx/internal/printer"
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)
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type SwitchOp struct {
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Target string // '-' for back and forth, or NAME
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Force bool // force switch even if the namespace doesn't exist
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}
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func (s SwitchOp) Run(_, stderr io.Writer) error {
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kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
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defer kc.Close()
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if err := kc.Parse(); err != nil {
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return errors.Wrap(err, "kubeconfig error")
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}
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toNS, err := switchNamespace(kc, s.Target, s.Force)
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if err != nil {
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return err
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}
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err = printer.Success(stderr, "Active namespace is \"%s\"", printer.SuccessColor.Sprint(toNS))
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return err
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}
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func switchNamespace(kc *kubeconfig.Kubeconfig, ns string, force bool) (string, error) {
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ctx := kc.GetCurrentContext()
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if ctx == "" {
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return "", errors.New("current-context is not set")
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}
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curNS, err := kc.NamespaceOfContext(ctx)
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if err != nil {
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return "", errors.Wrap(err, "failed to get current namespace")
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}
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f := NewNSFile(ctx)
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prev, err := f.Load()
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if err != nil {
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return "", errors.Wrap(err, "failed to load previous namespace from file")
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}
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if ns == "-" {
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if prev == "" {
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return "", errors.Errorf("No previous namespace found for current context (%s)", ctx)
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}
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ns = prev
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}
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if !force {
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ok, err := namespaceExists(kc, ns)
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if err != nil {
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return "", errors.Wrap(err, "failed to query if namespace exists (is cluster accessible?)")
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}
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if !ok {
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return "", errors.Errorf("no namespace exists with name \"%s\"", ns)
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}
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}
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if err := kc.SetNamespace(ctx, ns); err != nil {
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return "", errors.Wrapf(err, "failed to change to namespace \"%s\"", ns)
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}
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if err := kc.Save(); err != nil {
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return "", errors.Wrap(err, "failed to save kubeconfig file")
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}
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if curNS != ns {
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if err := f.Save(curNS); err != nil {
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return "", errors.Wrap(err, "failed to save the previous namespace to file")
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}
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}
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return ns, nil
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}
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func namespaceExists(kc *kubeconfig.Kubeconfig, ns string) (bool, error) {
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// for tests
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if os.Getenv("_MOCK_NAMESPACES") != "" {
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return ns == "ns1" || ns == "ns2", nil
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}
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clientset, err := newKubernetesClientSet(kc)
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if err != nil {
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return false, errors.Wrap(err, "failed to initialize k8s REST client")
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}
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namespace, err := clientset.CoreV1().Namespaces().Get(context.Background(), ns, metav1.GetOptions{})
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if errors2.IsNotFound(err) {
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return false, nil
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}
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return namespace != nil, errors.Wrapf(err, "failed to query "+
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"namespace %q from k8s API", ns)
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}
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