{"record":{"id":"5952684db68e11cd","repo":"ahmetb/kubectx","slug":"failed-to-save-kubeconfig-file-w-595268","errorCode":null,"errorMessage":"failed to save kubeconfig file: %w","messagePattern":"failed to save kubeconfig file: %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/kubens/unset.go","lineNumber":58,"sourceCode":"\terr = printer.Success(stderr, \"Active namespace is \\\"%s\\\".\", printer.SuccessColor.Sprint(ns))\n\treturn err\n}\n\nfunc clearNamespace(kc *kubeconfig.Kubeconfig) (string, error) {\n\tctx, err := kc.GetCurrentContext()\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"failed to get current context: %w\", err)\n\t}\n\tns := \"default\"\n\tif ctx == \"\" {\n\t\treturn \"\", errors.New(\"current-context is not set\")\n\t}\n\n\tif err := kc.SetNamespace(ctx, ns); err != nil {\n\t\treturn \"\", fmt.Errorf(\"failed to clear namespace: %w\", err)\n\t}\n\tif err := kc.Save(); err != nil {\n\t\treturn \"\", fmt.Errorf(\"failed to save kubeconfig file: %w\", err)\n\t}\n\treturn ns, nil\n}\n","sourceCodeStart":40,"sourceCodeEnd":62,"githubUrl":"https://github.com/ahmetb/kubectx/blob/12ad6fb22e8c546ee2b54e7de38aa51c906832f7/cmd/kubens/unset.go#L40-L62","documentation":"clearNamespace wraps an error from kc.Save() as \"failed to save kubeconfig file: %w\". Save persists modified kubeconfig contents to disk; it fails on filesystem problems — missing directory, insufficient write permissions, disk full, or the file being replaced/locked concurrently.","triggerScenarios":"kc.Save() errors after a successful SetNamespace during kubens unset: read-only ~/.kube directory, no write permission on config, ~/.kube missing, or an I/O error on flush.","commonSituations":"Running as a different user than the kubeconfig owner (root vs user); HOME not set in CI containers so the loader targets an unwritable path; read-only container filesystems; disk quota exceeded.","solutions":["Check file permissions: ensure the kubeconfig file and its directory are writable by the running user (ls -l ~/.kube/config; chmod/chown as needed).","Ensure the directory exists (mkdir -p ~/.kube) and HOME is set correctly.","In containers/CI, mount the kubeconfig directory as read-write instead of read-only.","Check disk space/quota with df if I/O errors persist."],"exampleFix":"// before: kubens unset run in CI with read-only mounted config\n// after: ensure writable mount\n// docker run -v \"$HOME/.kube:/home/user/.kube:rw\" ...\n// chmod u+w ~/.kube/config","handlingStrategy":"validation","validationCode":"// Shell: ensure the kubeconfig is writable before mutating commands\ncfg=\"${KUBECONFIG:-$HOME/.kube/config}\"\nmkdir -p \"$(dirname \"$cfg\")\"\n[ -w \"$cfg\" ] && [ -w \"$(dirname \"$cfg\")\" ] || { echo \"kubeconfig not writable: $cfg\"; exit 1; }","typeGuard":null,"tryCatchPattern":"if err := unsetOp.Run(os.Args, os.Stderr); err != nil {\n\tif strings.Contains(err.Error(), \"failed to save kubeconfig file\") {\n\t\tfmt.Fprintln(os.Stderr, \"Check write permissions on ~/.kube/config and that the filesystem is not read-only.\")\n\t}\n\treturn err\n}","preventionTips":["Run cluster tools as the user who owns ~/.kube/config, not via sudo.","Mount kubeconfig volumes read-write in containers/CI, and set HOME correctly.","Check disk space/quota on machines running config-mutating commands.","Avoid concurrent writers to the same kubeconfig file."],"tags":["filesystem","kubeconfig","permissions"],"backgroundTag":"file-write-permission-denied","analyzedSha":"12ad6fb22e8c546ee2b54e7de38aa51c906832f7","analyzedAt":"2026-09-02T12:23:10.107Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T16:17:10.729Z"}