mirror of
https://github.com/ahmetb/kubectx.git
synced 2026-03-18 11:52:24 +00:00
0d800e1367
This change addresses eight key improvements to the kubectx/kubens codebase: Resource Management Fixes: - Fix use-after-close bugs where Kubeconfig was accessed after Close() - Fix resource leaks on error paths by ensuring defer kc.Close() is called - Fix YAML encoder not being closed after Encode(), causing buffered data loss API Design Improvements: - Change ContextNames() to return ([]string, error) instead of silently returning nil on error, making parse failures distinguishable from empty results - Change GetCurrentContext() to return (string, error) instead of returning "" for both "not set" and parse error cases - Update all 16 call sites across cmd/kubectx and cmd/kubens packages to handle the new error returns while preserving backward-compatible behavior Error Handling: - Add explicit error handling for printer.Success() calls in 5+ locations by prefixing unchecked calls with _ = Performance: - Add slice pre-allocation in namespace list pagination using slices.Grow() before append loops, reducing allocations when fetching 500+ item batches All changes maintain backward compatibility for missing kubeconfig keys while improving error transparency and resource safety.
121 lines
3.3 KiB
Go
121 lines
3.3 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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"errors"
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"fmt"
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"io"
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"os"
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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 fmt.Errorf("kubeconfig error: %w", err)
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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, err := kc.GetCurrentContext()
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if err != nil {
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return "", fmt.Errorf("failed to get current context: %w", err)
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}
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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 "", fmt.Errorf("failed to get current namespace: %w", err)
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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 "", fmt.Errorf("failed to load previous namespace from file: %w", err)
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}
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if ns == "-" {
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if prev == "" {
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return "", fmt.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 "", fmt.Errorf("failed to query if namespace exists (is cluster accessible?): %w", err)
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}
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if !ok {
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return "", fmt.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 "", fmt.Errorf("failed to change to namespace \"%s\": %w", ns, err)
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}
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if err := kc.Save(); err != nil {
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return "", fmt.Errorf("failed to save kubeconfig file: %w", err)
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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 "", fmt.Errorf("failed to save the previous namespace to file: %w", err)
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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, fmt.Errorf("failed to initialize k8s REST client: %w", err)
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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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if err != nil {
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return false, fmt.Errorf("failed to query namespace %q from k8s API: %w", ns, err)
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}
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return namespace != nil, nil
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}
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