chore: update goreleaser config and release workflow

- Pin actions/checkout to v4 instead of @master for supply-chain safety
- Rename deprecated `builds` to `ids` in archive sections
- Rename deprecated `format` to `formats` (list) in format_overrides
- Update Snapcraft base from core20 (EOL) to core24
- Fix comment URL to HTTPS

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/dependabot.yml

@@ -0,0 +1,21 @@
+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: weekly
+  commit-message:
+    prefix: chore
+    include: scope
+
+- package-ecosystem: gomod
+  directory: /
+  schedule:
+    interval: weekly
+  commit-message:
+    prefix: chore
+    include: scope
+  groups:
+    kubernetes:
+      patterns:
+        - "k8s.io/*"

.github/workflows/bash-frozen.yml

@@ -0,0 +1,35 @@
+name: Bash scripts frozen
+
+on:
+  pull_request:
+    paths:
+      - 'kubectx'
+      - 'kubens'
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Comment on PR if author is not ahmetb
+        if: github.event.pull_request.user.login != 'ahmetb'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const body = [
+              '> [!WARNING]',
+              '> **This PR will not be merged.**',
+              '>',
+              '> The bash implementation of `kubectx` and `kubens` is **frozen** and is provided only for convenience.',
+              '> We are not accepting any improvements to the bash scripts.',
+              '>',
+              '> Please propose your improvements to the **Go implementation** instead.',
+            ].join('\n');
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: body
+            });

.github/workflows/ci.yml

@@ -23,23 +23,37 @@ jobs:
     - name: Checkout
       uses: actions/checkout@master
     - name: Setup Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v6
       with:
-        go-version: 1.16
+        go-version: '1.25'
+    - id: go-cache-paths
+      run: |
+        echo "::set-output name=go-build::$(go env GOCACHE)"
+        echo "::set-output name=go-mod::$(go env GOMODCACHE)"
+    - name: Go Build Cache
+      uses: actions/cache@v5
+      with:
+        path: ${{ steps.go-cache-paths.outputs.go-build }}
+        key: ${{ runner.os }}-go-build-${{ hashFiles('**/go.sum') }}
+    - name: Go Mod Cache
+      uses: actions/cache@v5
+      with:
+        path: ${{ steps.go-cache-paths.outputs.go-mod }}
+        key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
     - name: Ensure gofmt
       run: test -z "$(gofmt -s -d .)"
     - name: Ensure go.mod is already tidied
-      run: go mod tidy && git diff --no-patch --exit-code
+      run: go mod tidy && git diff --exit-code
     - name: Run unit tests
       run: go test ./...
     - name: Build with Goreleaser
-      uses: goreleaser/goreleaser-action@v1
+      uses: goreleaser/goreleaser-action@v7
       with:
         version: latest
-        args: release --snapshot --skip-publish --rm-dist
+        args: release --snapshot --skip publish,snapcraft --clean
     - name: Setup BATS framework
       run: sudo npm install -g bats
     - name: kubectx (Go) integration tests
-      run: COMMAND=./dist/kubectx_linux_amd64/kubectx bats test/kubectx.bats
+      run: COMMAND=./dist/kubectx_linux_amd64_v1/kubectx bats test/kubectx.bats
     - name: kubens (Go) integration tests
-      run: COMMAND=./dist/kubens_linux_amd64/kubens bats test/kubens.bats
+      run: COMMAND=./dist/kubens_linux_amd64_v1/kubens bats test/kubens.bats

.github/workflows/dependabot.yml

@@ -0,0 +1,24 @@
+name: Dependabot
+
+on:
+  pull_request:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  auto-merge:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+    - name: Dependabot metadata
+      id: metadata
+      uses: dependabot/fetch-metadata@v2
+
+    - name: Enable auto-merge for Dependabot PRs
+      if: ${{ steps.metadata.outputs.update-type != 'version-update:semver-major' }}
+      run: gh pr merge --auto --merge "$PR_URL"
+      env:
+        PR_URL: ${{ github.event.pull_request.html_url }}
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

@@ -19,26 +19,40 @@ on:
     - 'v*.*.*'
 jobs:
   goreleaser:
+    permissions:
+      contents: write
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@v4
+    - run: git fetch --tags
     - name: Setup Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v6
       with:
-        go-version: 1.16
+        go-version: '1.25'
+    - name: Install Snapcraft
+      uses: samuelmeuli/action-snapcraft@v3
+    - name: Setup Snapcraft
+      run: |
+        # https://github.com/goreleaser/goreleaser/issues/1715
+        mkdir -p $HOME/.cache/snapcraft/download
+        mkdir -p $HOME/.cache/snapcraft/stage-packages
     - name: GoReleaser
-      uses: goreleaser/goreleaser-action@v2
+      uses: goreleaser/goreleaser-action@v7
       with:
         version: latest
-        args: release --rm-dist
+        args: release --clean
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     - name: Update new version for plugin 'ctx' in krew-index
-      uses: rajatjindal/krew-release-bot@v0.0.38
+      uses: rajatjindal/krew-release-bot@v0.0.51
       with:
         krew_template_file: .krew/ctx.yaml
     - name: Update new version for plugin 'ns' in krew-index
-      uses: rajatjindal/krew-release-bot@v0.0.38
+      uses: rajatjindal/krew-release-bot@v0.0.51
       with:
         krew_template_file: .krew/ns.yaml
+    - name: Publish Snaps to the Snap Store (stable channel)
+      run: for snap in $(ls dist/*.snap); do snapcraft upload --release=stable $snap; done
+      env:
+        SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_TOKEN }}

.goreleaser.yml

@@ -1,3 +1,5 @@
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+
 # Copyright 2021 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,7 +15,9 @@
 # limitations under the License.
 
 # This is an example goreleaser.yaml file with some sane defaults.
-# Make sure to check the documentation at http://goreleaser.com
+# Make sure to check the documentation at https://goreleaser.com
+
+version: 2
 before:
   hooks:
     - go mod download
@@ -32,6 +36,7 @@ builds:
     - arm
     - arm64
     - ppc64le
+    - s390x
   goarm: [6, 7]
 - id: kubens
   main: ./cmd/kubens
@@ -47,41 +52,48 @@ builds:
     - arm
     - arm64
     - ppc64le
+    - s390x
   goarm: [6, 7]
 archives:
 - id: kubectx-archive
   name_template: |-
-    kubectx_{{ .Tag }}_{{ .Os }}_{{ .Arch -}}
+    kubectx_{{ .Tag }}_{{ .Os }}_
+    {{- with .Arch -}}
+      {{- if (eq . "386") -}}i386
+      {{- else if (eq . "amd64") -}}x86_64
+      {{- else -}}{{- . -}}
+      {{- end -}} 
+    {{ end }}
     {{- with .Arm -}}
       {{- if (eq . "6") -}}hf
       {{- else -}}v{{- . -}}
       {{- end -}}
     {{- end -}}
-  builds:
+  ids:
     - kubectx
-  replacements:
-    386: i386
-    amd64: x86_64
   format_overrides:
     - goos: windows
-      format: zip
+      formats: [zip]
   files: ["LICENSE"]
 - id: kubens-archive
   name_template: |-
-    kubens_{{ .Tag }}_{{ .Os }}_{{ .Arch -}}
+    kubens_{{ .Tag }}_{{ .Os }}_
+    {{- with .Arch -}}
+      {{- if (eq . "386") -}}i386
+      {{- else if (eq . "amd64") -}}x86_64
+      {{- else -}}{{- . -}}
+      {{- end -}}
+    {{ end }}
     {{- with .Arm -}}
       {{- if (eq . "6") -}}hf
       {{- else -}}v{{- . -}}
       {{- end -}}
     {{- end -}}
-  builds:
+  ids:
     - kubens
-  replacements:
-    386: i386
-    amd64: x86_64
   format_overrides:
     - goos: windows
-      format: zip
+      formats: [zip]
   files: ["LICENSE"]
 checksum:
   name_template: "checksums.txt"
@@ -90,3 +102,20 @@ release:
   extra_files:
     - glob: ./kubens
     - glob: ./kubectx
+snapcrafts:
+  - id: kubectx
+    name: kubectx
+    summary: 'kubectx + kubens: Power tools for kubectl'
+    description: |
+      kubectx is a tool to switch between contexts (clusters) on kubectl faster.
+      kubens is a tool to switch between Kubernetes namespaces (and configure them for kubectl) easily.
+    grade: stable
+    confinement: classic
+    base: core24
+    apps:
+      kubectx:
+        command: kubectx
+        completer: completion/kubectx.bash
+      kubens:
+        command: kubens
+        completer: completion/kubens.bash

README.md

@@ -2,117 +2,110 @@
 
 ![Latest GitHub release](https://img.shields.io/github/release/ahmetb/kubectx.svg)
 ![GitHub stars](https://img.shields.io/github/stars/ahmetb/kubectx.svg?label=github%20stars)
+![Homebrew downloads](https://img.shields.io/homebrew/installs/dy/kubectx?label=macOS%20installs)
 [![Go implementation (CI)](https://github.com/ahmetb/kubectx/workflows/Go%20implementation%20(CI)/badge.svg)](https://github.com/ahmetb/kubectx/actions?query=workflow%3A"Go+implementation+(CI)")
 ![Proudly written in Bash](https://img.shields.io/badge/written%20in-bash-ff69b4.svg)
 
 This repository provides both `kubectx` and `kubens` tools.
 [Install →](#installation)
 
-> **🥳📰 NEWS:** With v0.9.0 `kubectx` and `kubens` **are now rewritten in Go**.
-> (Don't worry, our lovely **bash** versions are still available!) Please test
-> this new Go binaries by downloading them from
-> [**Releases →**](https://github.com/ahmetb/kubectx/releases)
+## What are `kubectx` and `kubens`?
 
-**`kubectx`** helps you switch between clusters back and forth:
+**kubectx** is a tool to switch between contexts (clusters) on kubectl
+faster.<br/>
+**kubens** is a tool to switch between Kubernetes namespaces (and
+configure them for kubectl) easily.
+
+Here's a **`kubectx`** demo:
 ![kubectx demo GIF](img/kubectx-demo.gif)
 
-**`kubens`** helps you switch between Kubernetes namespaces smoothly:
+...and here's a **`kubens`** demo:
 ![kubens demo GIF](img/kubens-demo.gif)
 
-# kubectx(1)
-
-kubectx is a utility to manage and switch between kubectl(1) contexts.
-
-```
-USAGE:
-  kubectx                   : list the contexts
-  kubectx <NAME>            : switch to context <NAME>
-  kubectx -                 : switch to the previous context
-  kubectx -c, --current     : show the current context name
-  kubectx <NEW_NAME>=<NAME> : rename context <NAME> to <NEW_NAME>
-  kubectx <NEW_NAME>=.      : rename current-context to <NEW_NAME>
-  kubectx -d <NAME>         : delete context <NAME> ('.' for current-context)
-                              (this command won't delete the user/cluster entry
-                              that is used by the context)
-  kubectx -u, --unset       : unset the current context
-```
-
-### Usage
+### Examples
 
 ```sh
+# switch to another cluster that's in kubeconfig
 $ kubectx minikube
 Switched to context "minikube".
 
+# switch back to previous cluster
 $ kubectx -
 Switched to context "oregon".
 
-$ kubectx -
-Switched to context "minikube".
+# start an "isolated shell" that only has a single context
+$ kubectx -s minikube
 
+# rename context
 $ kubectx dublin=gke_ahmetb_europe-west1-b_dublin
-Context "dublin" set.
-Aliased "gke_ahmetb_europe-west1-b_dublin" as "dublin".
-```
+Context "gke_ahmetb_europe-west1-b_dublin" renamed to "dublin".
 
-`kubectx` supports <kbd>Tab</kbd> completion on bash/zsh/fish shells to help with
-long context names. You don't have to remember full context names anymore.
-
------
-
-# kubens(1)
-
-kubens is a utility to switch between Kubernetes namespaces.
-
-```
-USAGE:
-  kubens                    : list the namespaces
-  kubens <NAME>             : change the active namespace
-  kubens -                  : switch to the previous namespace
-  kubens -c, --current      : show the current namespace
-```
-
-
-### Usage
-
-```sh
+# change the active namespace on kubectl
 $ kubens kube-system
 Context "test" set.
 Active namespace is "kube-system".
 
+# go back to the previous namespace
 $ kubens -
 Context "test" set.
 Active namespace is "default".
+
+# change the active namespace even if it doesn't exist
+$ kubens not-found-namespace --force
+Context "test" set.
+Active namespace is "not-found-namespace".
+---
+$ kubens not-found-namespace -f
+Context "test" set.
+Active namespace is "not-found-namespace".
 ```
 
-`kubens` also supports <kbd>Tab</kbd> completion on bash/zsh/fish shells.
+If you have [`fzf`](https://github.com/junegunn/fzf) installed, you can also
+**interactively** select a context or cluster, or fuzzy-search by typing a few
+characters. To learn more, read [interactive mode &rarr;](#interactive-mode)
+
+Both `kubectx` and `kubens` support <kbd>Tab</kbd> completion on bash/zsh/fish
+shells to help with long context names. You don't have to remember full context
+names anymore.
 
 -----
 
 ## Installation
 
-> **🥳📰 NEWS:** With v0.9.0 `kubectx` and `kubens` **are now rewritten in Go**.
-> (Don't worry, our lovely **bash** versions are still available!) Please test
-> this new Go binaries by downloading them from
-> [**Releases &rarr;**](https://github.com/ahmetb/kubectx/releases)
+Stable versions of `kubectx` and `kubens` are small bash scripts that you
+can find in this repository.
 
-There are several installation options:
+Starting with v0.9.0, `kubectx` and `kubens` **are now rewritten in Go**.  They
+should work the same way (and we'll keep the bash-based implementations around)
+but the new features will be added to the new Go programs.  Please help us test
+this new Go implementation by downloading the binaries from the [**Releases page
+&rarr;**](https://github.com/ahmetb/kubectx/releases)
 
-- As kubectl plugins (macOS/Linux)
-- macOS
-  - Homebrew (recommended)
-  - MacPorts
-- Linux
-  - Debian
-  - Arch Linux
-  - Homebrew
-  - Manual installation
+**Installation options:**
+
+- [as kubectl plugins (macOS & Linux)](#kubectl-plugins-macos-and-linux)
+- [with Homebrew (macOS & Linux)](#homebrew-macos-and-linux)
+- [with MacPorts (macOS)](#macports-macos)
+- [with apt (Debian)](#apt-debian)
+- [with pacman (Arch Linux)](#pacman-arch-linux)
+- [with Chocolatey (Windows)](#windows-installation-using-chocolatey)
+- [Windows Installation (using Scoop)](#windows-installation-using-scoop)
+- [with winget (Windows)](#windows-installation-using-winget)
+- [manually (macOS & Linux)](#manual-installation-macos-and-linux)
+
+If you like to add context/namespace information to your shell prompt (`$PS1`),
+you can try out [kube-ps1].
+
+[kube-ps1]: https://github.com/jonmosco/kube-ps1
 
 ### Kubectl Plugins (macOS and Linux)
 
-You can install and use [Krew](https://github.com/kubernetes-sigs/krew/) kubectl
-plugin manager to get `kubectx` and `kubens`. **NOTE:** This will not install
-shell completion scripts, if you want those, choose another installation method
-below.
+You can install and use the [Krew](https://github.com/kubernetes-sigs/krew/) kubectl
+plugin manager to get `kubectx` and `kubens`.
+
+**Note:** This will not install the shell completion scripts. If you want them,
+*choose another installation method
+or install the scripts [manually](#manual-installation-macos-and-linux).
 
 ```sh
 kubectl krew install ctx
@@ -121,33 +114,30 @@ kubectl krew install ns
 
 After installing, the tools will be available as `kubectl ctx` and `kubectl ns`.
 
-### macOS
+### Homebrew (macOS and Linux)
 
-#### Homebrew
+If you use [Homebrew](https://brew.sh/) you can install like this:
 
-:confetti_ball: If you use [Homebrew](https://brew.sh/) you can install like this:
+```sh
+brew install kubectx
+```
 
-    brew install kubectx
+This command will set up bash/zsh/fish completion scripts automatically. Make sure you [configure your shell](https://docs.brew.sh/Shell-Completion) to load completions for installed Homebrew formulas.
 
-This command will set up bash/zsh/fish completion scripts automatically.
 
-- If you like to add context/namespace info to your shell prompt (`$PS1`),
-  I recommend trying out [kube-ps1](https://github.com/jonmosco/kube-ps1).
-
-#### MacPorts
+### MacPorts (macOS)
 
 If you use [MacPorts](https://www.macports.org) you can install like this:
 
-    sudo port install kubectx
+```sh
+sudo port install kubectx
+```
 
-### Linux
-
-#### Debian
+### apt (Debian)
 
 ``` bash
 sudo apt install kubectx
 ```
-
 Newer versions might be available on repos like
 [Debian Buster (testing)](https://packages.debian.org/buster/kubectx),
 [Sid (unstable)](https://packages.debian.org/sid/kubectx)
@@ -155,7 +145,8 @@ Newer versions might be available on repos like
 testing/unstable repos, check out the
 [Debian Wiki](https://wiki.debian.org/DebianReleases)_):
 
-#### Arch Linux
+
+### pacman (Arch Linux)
 
 Available as official Arch Linux package. Install it via:
 
@@ -163,20 +154,32 @@ Available as official Arch Linux package. Install it via:
 sudo pacman -S kubectx
 ```
 
-#### Homebrew
+### Windows Installation (using Chocolatey)
 
-:confetti_ball: If you use [Homebrew](https://brew.sh/) you can install like this:
+Available as packages on [Chocolatey](https://chocolatey.org/why-chocolatey)
+```pwsh
+choco install kubens kubectx
+```
 
-    brew install kubectx
+### Windows Installation (using Scoop)
 
-This command will set up bash/zsh/fish completion scripts automatically.
+Available as packages on [Scoop](https://scoop.sh/)
+```pwsh
+scoop bucket add main
+scoop install main/kubens main/kubectx
+```
 
-- If you like to add context/namespace info to your shell prompt (`$PS1`),
-  I recommend trying out [kube-ps1](https://github.com/jonmosco/kube-ps1).
+### Windows Installation (using winget)
 
-#### Manual
+Available as packages on [winget](https://learn.microsoft.com/en-us/windows/package-manager/)
+```pwsh
+winget install --id ahmetb.kubectx
+winget install --id ahmetb.kubens
+```
 
-Since `kubectx`/`kubens` are written in Bash, you should be able to install
+### Manual Installation (macOS and Linux)
+
+Since `kubectx` and `kubens` are written in Bash, you should be able to install
 them to any POSIX environment that has Bash installed.
 
 - Download the `kubectx`, and `kubens` scripts.
@@ -185,38 +188,6 @@ them to any POSIX environment that has Bash installed.
   - or save them to a directory, then create symlinks to `kubectx`/`kubens` from
     somewhere in your `PATH`, like `/usr/local/bin`
 - Make `kubectx` and `kubens` executable (`chmod +x ...`)
-- Install bash/zsh/fish [completion scripts](completion/).
-  - For zsh:
-    The completion scripts have to be in a path that belongs to `$fpath`. Either link or copy them to an existing folder.
-    If using oh-my-zsh you can do as follows:
-    ```bash
-    mkdir -p ~/.oh-my-zsh/completions
-    chmod -R 755 ~/.oh-my-zsh/completions
-    ln -s /opt/kubectx/completion/kubectx.zsh ~/.oh-my-zsh/completions/_kubectx.zsh
-    ln -s /opt/kubectx/completion/kubens.zsh ~/.oh-my-zsh/completions/_kubens.zsh
-    ```
-    Note that the leading underscore seems to be a convention. If completion doesn't work, add `autoload -U compinit && compinit` to your `.zshrc` (similar to [`zsh-completions`](https://github.com/zsh-users/zsh-completions/blob/master/README.md#oh-my-zsh)).
-    If not using oh-my-zsh, you could link to `/usr/share/zsh/functions/Completion` (might require sudo), depending on the `$fpath` of your zsh installation.
-    In case of error, calling `compaudit` might help.
-  - For bash:
-    ```bash
-    git clone https://github.com/ahmetb/kubectx.git ~/.kubectx
-    COMPDIR=$(pkg-config --variable=completionsdir bash-completion)
-    ln -sf ~/.kubectx/completion/kubens.bash $COMPDIR/kubens
-    ln -sf ~/.kubectx/completion/kubectx.bash $COMPDIR/kubectx
-    cat << FOE >> ~/.bashrc
-
-
-    #kubectx and kubens
-    export PATH=~/.kubectx:\$PATH
-    FOE
-    ```
-  - For fish:
-    ```fish
-    mkdir -p ~/.config/fish/completions
-    ln -s /opt/kubectx/completion/kubectx.fish ~/.config/fish/completions/
-    ln -s /opt/kubectx/completion/kubens.fish ~/.config/fish/completions/
-    ```
 
 Example installation steps:
 
@@ -226,61 +197,118 @@ sudo ln -s /opt/kubectx/kubectx /usr/local/bin/kubectx
 sudo ln -s /opt/kubectx/kubens /usr/local/bin/kubens
 ```
 
+If you also want to have shell completions, pick an installation method for the
+[completion scripts](completion/) that fits your system best: [`zsh` with
+`antibody`](#completion-scripts-for-zsh-with-antibody), [plain
+`zsh`](#completion-scripts-for-plain-zsh),
+[`bash`](#completion-scripts-for-bash) or
+[`fish`](#completion-scripts-for-fish).
+
+#### Completion scripts for `zsh` with [antibody](https://getantibody.github.io)
+
+Add this line to your [Plugins File](https://getantibody.github.io/usage/) (e.g.
+`~/.zsh_plugins.txt`):
+
+```
+ahmetb/kubectx path:completion kind:fpath
+```
+
+Depending on your setup, you might or might not need to call `compinit` or
+`autoload -U compinit && compinit` in your `~/.zshrc` after you load the Plugins
+file. If you use [oh-my-zsh](https://github.com/ohmyzsh/ohmyzsh), load the
+completions before you load `oh-my-zsh` because `oh-my-zsh` will call
+`compinit`. 
+
+#### Completion scripts for plain `zsh`
+
+The completion scripts have to be in a path that belongs to `$fpath`. Either
+link or copy them to an existing folder.
+
+Example with [`oh-my-zsh`](https://github.com/ohmyzsh/ohmyzsh):
+
+```bash
+mkdir -p ~/.oh-my-zsh/custom/completions
+chmod -R 755 ~/.oh-my-zsh/custom/completions
+ln -s /opt/kubectx/completion/_kubectx.zsh ~/.oh-my-zsh/custom/completions/_kubectx.zsh
+ln -s /opt/kubectx/completion/_kubens.zsh ~/.oh-my-zsh/custom/completions/_kubens.zsh
+echo "fpath=($ZSH/custom/completions $fpath)" >> ~/.zshrc
+```
+
+If completion doesn't work, add `autoload -U compinit && compinit` to your
+`.zshrc` (similar to
+[`zsh-completions`](https://github.com/zsh-users/zsh-completions/blob/master/README.md#oh-my-zsh)).
+
+If you are not using [`oh-my-zsh`](https://github.com/ohmyzsh/ohmyzsh), you
+could link to `/usr/share/zsh/functions/Completion` (might require sudo),
+depending on the `$fpath` of your zsh installation.
+
+In case of errors, calling `compaudit` might help.
+
+#### Completion scripts for `bash`
+
+```bash
+git clone https://github.com/ahmetb/kubectx.git ~/.kubectx
+COMPDIR=$(pkg-config --variable=completionsdir bash-completion)
+ln -sf ~/.kubectx/completion/kubens.bash $COMPDIR/kubens
+ln -sf ~/.kubectx/completion/kubectx.bash $COMPDIR/kubectx
+cat << EOF >> ~/.bashrc
+
+
+#kubectx and kubens
+export PATH=~/.kubectx:\$PATH
+EOF
+```
+
+#### Completion scripts for `fish`
+
+```fish
+mkdir -p ~/.config/fish/completions
+ln -s /opt/kubectx/completion/kubectx.fish ~/.config/fish/completions/
+ln -s /opt/kubectx/completion/kubens.fish ~/.config/fish/completions/
+```
+
 -----
 
 ### Interactive mode
 
 If you want `kubectx` and `kubens` commands to present you an interactive menu
 with fuzzy searching, you just need to [install
-`fzf`](https://github.com/junegunn/fzf) in your PATH.
+`fzf`](https://github.com/junegunn/fzf) in your `$PATH`.
 
 ![kubectx interactive search with fzf](img/kubectx-interactive.gif)
 
-If you have `fzf` installed, but want to opt out of using this feature, set the environment variable `KUBECTX_IGNORE_FZF=1`.
-
-If you want to keep `fzf` interactive mode but need the default behavior of the command, you can do it using Unix composability:
-```
-kubectx | cat
-```
+If you have `fzf` installed, but want to opt out of using this feature, set the
+environment variable `KUBECTX_IGNORE_FZF=1`.
 
+If you want to keep `fzf` interactive mode but need the default behavior of the
+command, you can do it by piping the output to another command (e.g. `kubectx |
+cat `).
 
 -----
 
 ### Customizing colors
 
-If you like to customize the colors indicating the current namespace or context, set the environment variables `KUBECTX_CURRENT_FGCOLOR` and `KUBECTX_CURRENT_BGCOLOR` (refer color codes [here](https://linux.101hacks.com/ps1-examples/prompt-color-using-tput/)):
+If you like to customize the colors indicating the current namespace or context,
+set the environment variables `KUBECTX_CURRENT_FGCOLOR` and
+`KUBECTX_CURRENT_BGCOLOR` (refer color codes
+[here](https://linux.101hacks.com/ps1-examples/prompt-color-using-tput/)):
 
-```
+```sh
 export KUBECTX_CURRENT_FGCOLOR=$(tput setaf 6) # blue text
 export KUBECTX_CURRENT_BGCOLOR=$(tput setab 7) # white background
 ```
 
 Colors in the output can be disabled by setting the
-[`NO_COLOR`](http://no-color.org/) environment variable.
+[`NO_COLOR`](https://no-color.org/) environment variable.
 
 -----
 
-####  Users
-
-| What are others saying about kubectx? |
-| ---- |
-| _“Thank you for kubectx & kubens - I use them all the time & have them in my k8s toolset to maintain happiness :) ”_ – [@pbouwer](https://twitter.com/pbouwer/status/925896377929949184) |
-| _“I can't imagine working without kubectx and especially kubens anymore. It's pure gold.”_ – [@timoreimann](https://twitter.com/timoreimann/status/925801946757419008) |
-| _“I'm liking kubectx from @ahmetb, makes it super-easy to switch #Kubernetes contexts [...]”_ &mdash; [@lizrice](https://twitter.com/lizrice/status/928556415517589505) |
-| _“Also using it on a daily basis. This and my zsh config that shows me the current k8s context 😉”_ – [@puja108](https://twitter.com/puja108/status/928742521139810305) |
-| _“Lately I've found myself using the kubens command more than kubectx. Both very useful though :-)”_ – [@stuartleeks](https://twitter.com/stuartleeks/status/928562850464907264) |
-| _“yeah kubens rocks!”_ – [@embano1](https://twitter.com/embano1/status/928698440732815360) |
-| _“Special thanks to Ahmet Alp Balkan for creating kubectx, kubens, and kubectl aliases, as these tools made my life better.”_ – [@strebeld](https://medium.com/@strebeld/5-ways-to-enhance-kubectl-ux-97c8893227a) |
-| _“❤️ this shell script @ahmetb wrote to help make switching between kubectl config contexts a breeze.”_ – [@briandanowski](https://twitter.com/briandanowski/status/1085409568165896193) |
-
-> If you liked `kubectx`, you may like my [`kubectl-aliases`](https://github.com/ahmetb/kubectl-aliases) project, too.
-
------
-
-Disclaimer: This is not an official Google product.
-
+If you liked `kubectx`, you may like my
+[`kubectl-aliases`](https://github.com/ahmetb/kubectl-aliases) project, too. I
+recommend pairing kubectx and kubens with [fzf](#interactive-mode) and
+[kube-ps1].
 
 #### Stargazers over time
 
-[![Stargazers over time](https://starcharts.herokuapp.com/ahmetb/kubectx.svg)](https://starcharts.herokuapp.com/ahmetb/kubectx)
-![Google Analytics](https://ga-beacon.appspot.com/UA-2609286-17/kubectx/README?pixel)
+[![Stargazers over time](https://starchart.cc/ahmetb/kubectx.svg)](https://starchart.cc/ahmetb/kubectx)
+![Google Analytics](https://ga-beacon.appspot.com/UA-2609286-17/kubectx/README?pixel) <!-- TODO broken since Aug 2021 as igrigorik left Google -->

cmd/kubectx/current.go

@@ -15,11 +15,10 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"io"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
 )
 
@@ -27,10 +26,13 @@ import (
 type CurrentOp struct{}
 
 func (_op CurrentOp) Run(stdout, _ io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	v := kc.GetCurrentContext()
@@ -38,5 +40,8 @@ func (_op CurrentOp) Run(stdout, _ io.Writer) error {
 		return errors.New("current-context is not set")
 	}
 	_, err := fmt.Fprintln(stdout, v)
-	return errors.Wrap(err, "write error")
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
 }

cmd/kubectx/delete.go

@@ -15,10 +15,10 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"io"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
 	"github.com/ahmetb/kubectx/internal/printer"
 )
@@ -30,11 +30,14 @@ type DeleteOp struct {
 
 // deleteContexts deletes context entries one by one.
 func (op DeleteOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	for _, ctx := range op.Contexts {
-		// TODO inefficency here. we open/write/close the same file many times.
+		// TODO inefficiency here. we open/write/close the same file many times.
 		deletedName, wasActiveContext, err := deleteContext(ctx)
 		if err != nil {
-			return errors.Wrapf(err, "error deleting context \"%s\"", deletedName)
+			return fmt.Errorf("error deleting context \"%s\": %w", deletedName, err)
 		}
 		if wasActiveContext {
 			printer.Warning(stderr, "You deleted the current context. Use \"%s\" to select a new context.",
@@ -52,7 +55,7 @@ func deleteContext(name string) (deleteName string, wasActiveContext bool, err e
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return deleteName, false, errors.Wrap(err, "kubeconfig error")
+		return deleteName, false, fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	cur := kc.GetCurrentContext()
@@ -70,7 +73,10 @@ func deleteContext(name string) (deleteName string, wasActiveContext bool, err e
 	}
 
 	if err := kc.DeleteContextEntry(name); err != nil {
-		return name, false, errors.Wrap(err, "failed to modify yaml doc")
+		return name, false, fmt.Errorf("failed to modify yaml doc: %w", err)
 	}
-	return name, wasActiveContext, errors.Wrap(kc.Save(), "failed to save modified kubeconfig file")
+	if err := kc.Save(); err != nil {
+		return name, wasActiveContext, fmt.Errorf("failed to save modified kubeconfig file: %w", err)
+	}
+	return name, wasActiveContext, nil
 }

cmd/kubectx/flags.go

@@ -40,9 +40,20 @@ func parseArgs(argv []string) Op {
 		return ListOp{}
 	}
 
+	if argv[0] == "--shell" || argv[0] == "-s" {
+		if len(argv) != 2 {
+			return UnsupportedOp{Err: fmt.Errorf("'%s' requires exactly one context name argument", argv[0])}
+		}
+		return ShellOp{Target: argv[1]}
+	}
+
 	if argv[0] == "-d" {
 		if len(argv) == 1 {
-			return UnsupportedOp{Err: fmt.Errorf("'-d' needs arguments")}
+			if cmdutil.IsInteractiveMode(os.Stdout) {
+				return InteractiveDeleteOp{SelfCmd: os.Args[0]}
+			} else {
+				return UnsupportedOp{Err: fmt.Errorf("'-d' needs arguments")}
+			}
 		}
 		return DeleteOp{Contexts: argv[1:]}
 	}
@@ -52,6 +63,9 @@ func parseArgs(argv []string) Op {
 		if v == "--help" || v == "-h" {
 			return HelpOp{}
 		}
+		if v == "--version" || v == "-V" {
+			return VersionOp{}
+		}
 		if v == "--current" || v == "-c" {
 			return CurrentOp{}
 		}

cmd/kubectx/flags_test.go

@@ -72,6 +72,18 @@ func Test_parseArgs_new(t *testing.T) {
 		{name: "rename context with old=current",
 			args: []string{"a=."},
 			want: RenameOp{"a", "."}},
+		{name: "shell shorthand",
+			args: []string{"-s", "prod"},
+			want: ShellOp{Target: "prod"}},
+		{name: "shell long form",
+			args: []string{"--shell", "prod"},
+			want: ShellOp{Target: "prod"}},
+		{name: "shell without context name",
+			args: []string{"-s"},
+			want: UnsupportedOp{Err: fmt.Errorf("'-s' requires exactly one context name argument")}},
+		{name: "shell with too many args",
+			args: []string{"--shell", "a", "b"},
+			want: UnsupportedOp{Err: fmt.Errorf("'--shell' requires exactly one context name argument")}},
 		{name: "unrecognized flag",
 			args: []string{"-x"},
 			want: UnsupportedOp{Err: fmt.Errorf("unsupported option '-x'")}},

cmd/kubectx/fzf.go

@@ -16,14 +16,13 @@ package main
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"os"
 	"os/exec"
 	"strings"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/cmdutil"
 	"github.com/ahmetb/kubectx/internal/env"
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
@@ -34,7 +33,14 @@ type InteractiveSwitchOp struct {
 	SelfCmd string
 }
 
+type InteractiveDeleteOp struct {
+	SelfCmd string
+}
+
 func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	// parse kubeconfig just to see if it can be loaded
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	if err := kc.Parse(); err != nil {
@@ -42,7 +48,7 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 			printer.Warning(stderr, "kubeconfig file not found")
 			return nil
 		}
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 	kc.Close()
 
@@ -56,7 +62,8 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 		fmt.Sprintf("FZF_DEFAULT_COMMAND=%s", op.SelfCmd),
 		fmt.Sprintf("%s=1", env.EnvForceColor))
 	if err := cmd.Run(); err != nil {
-		if _, ok := err.(*exec.ExitError); !ok {
+		var exitErr *exec.ExitError
+		if !errors.As(err, &exitErr) {
 			return err
 		}
 	}
@@ -66,8 +73,63 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 	}
 	name, err := switchContext(choice)
 	if err != nil {
-		return errors.Wrap(err, "failed to switch context")
+		return fmt.Errorf("failed to switch context: %w", err)
 	}
 	printer.Success(stderr, "Switched to context \"%s\".", printer.SuccessColor.Sprint(name))
 	return nil
 }
+
+func (op InteractiveDeleteOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
+	// parse kubeconfig just to see if it can be loaded
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	if err := kc.Parse(); err != nil {
+		if cmdutil.IsNotFoundErr(err) {
+			printer.Warning(stderr, "kubeconfig file not found")
+			return nil
+		}
+		return fmt.Errorf("kubeconfig error: %w", err)
+	}
+	kc.Close()
+
+	if len(kc.ContextNames()) == 0 {
+		return errors.New("no contexts found in config")
+	}
+
+	cmd := exec.Command("fzf", "--ansi", "--no-preview")
+	var out bytes.Buffer
+	cmd.Stdin = os.Stdin
+	cmd.Stderr = stderr
+	cmd.Stdout = &out
+
+	cmd.Env = append(os.Environ(),
+		fmt.Sprintf("FZF_DEFAULT_COMMAND=%s", op.SelfCmd),
+		fmt.Sprintf("%s=1", env.EnvForceColor))
+	if err := cmd.Run(); err != nil {
+		var exitErr *exec.ExitError
+		if !errors.As(err, &exitErr) {
+			return err
+		}
+	}
+
+	choice := strings.TrimSpace(out.String())
+	if choice == "" {
+		return errors.New("you did not choose any of the options")
+	}
+
+	name, wasActiveContext, err := deleteContext(choice)
+	if err != nil {
+		return fmt.Errorf("failed to delete context: %w", err)
+	}
+
+	if wasActiveContext {
+		printer.Warning(stderr, "You deleted the current context. Use \"%s\" to select a new context.",
+			selfName())
+	}
+
+	printer.Success(stderr, `Deleted context %s.`, printer.SuccessColor.Sprint(name))
+
+	return nil
+}

cmd/kubectx/help.go

@@ -20,8 +20,6 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-
-	"github.com/pkg/errors"
 )
 
 // HelpOp describes printing help.
@@ -39,16 +37,21 @@ func printUsage(out io.Writer) error {
   %PROG% -c, --current         : show the current context name
   %PROG% <NEW_NAME>=<NAME>     : rename context <NAME> to <NEW_NAME>
   %PROG% <NEW_NAME>=.          : rename current-context to <NEW_NAME>
-  %PROG% -u, --unset           : unset the current context  
+  %PROG% -u, --unset           : unset the current context
   %PROG% -d <NAME> [<NAME...>] : delete context <NAME> ('.' for current-context)
   %SPAC%                         (this command won't delete the user/cluster entry
   %SPAC%                          referenced by the context entry)
-  %PROG% -h,--help             : show this message`
+  %PROG% -s, --shell <NAME>    : start a shell scoped to context <NAME>
+  %PROG% -h,--help             : show this message
+  %PROG% -V,--version          : show version`
 	help = strings.ReplaceAll(help, "%PROG%", selfName())
 	help = strings.ReplaceAll(help, "%SPAC%", strings.Repeat(" ", len(selfName())))
 
 	_, err := fmt.Fprintf(out, "%s\n", help)
-	return errors.Wrap(err, "write error")
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
 }
 
 // selfName guesses how the user invoked the program.

cmd/kubectx/isolated_shell_guard.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/ahmetb/kubectx/internal/env"
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+)
+
+func checkIsolatedMode() error {
+	if os.Getenv(env.EnvIsolatedShell) != "1" {
+		return nil
+	}
+
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return fmt.Errorf("you are in a locked single-context shell, use 'exit' to leave")
+	}
+
+	cur := kc.GetCurrentContext()
+	return fmt.Errorf("you are in a locked single-context shell (\"%s\"), use 'exit' to leave", cur)
+}

cmd/kubectx/list.go

@@ -19,7 +19,6 @@ import (
 	"io"
 
 	"facette.io/natsort"
-	"github.com/pkg/errors"
 
 	"github.com/ahmetb/kubectx/internal/cmdutil"
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
@@ -30,6 +29,9 @@ import (
 type ListOp struct{}
 
 func (_ ListOp) Run(stdout, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
@@ -37,7 +39,7 @@ func (_ ListOp) Run(stdout, stderr io.Writer) error {
 			printer.Warning(stderr, "kubeconfig file not found")
 			return nil
 		}
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	ctxs := kc.ContextNames()

cmd/kubectx/main.go

@@ -34,7 +34,7 @@ func main() {
 
 	op := parseArgs(os.Args[1:])
 	if err := op.Run(color.Output, color.Error); err != nil {
-		printer.Error(color.Error, err.Error())
+		printer.Error(color.Error, "%s", err)
 
 		if _, ok := os.LookupEnv(env.EnvDebug); ok {
 			// print stack trace in verbose mode

cmd/kubectx/rename.go

@@ -15,11 +15,10 @@
 package main
 
 import (
+	"fmt"
 	"io"
 	"strings"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
 	"github.com/ahmetb/kubectx/internal/printer"
 )
@@ -33,12 +32,8 @@ type RenameOp struct {
 // parseRenameSyntax parses A=B form into [A,B] and returns
 // whether it is parsed correctly.
 func parseRenameSyntax(v string) (string, string, bool) {
-	s := strings.Split(v, "=")
-	if len(s) != 2 {
-		return "", "", false
-	}
-	new, old := s[0], s[1]
-	if new == "" || old == "" {
+	new, old, ok := strings.Cut(v, "=")
+	if !ok || new == "" || old == "" {
 		return "", "", false
 	}
 	return new, old, true
@@ -48,10 +43,13 @@ func parseRenameSyntax(v string) (string, string, bool) {
 // to the "new" value. If the old refers to the current-context,
 // current-context preference is also updated.
 func (op RenameOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	cur := kc.GetCurrentContext()
@@ -60,26 +58,26 @@ func (op RenameOp) Run(_, stderr io.Writer) error {
 	}
 
 	if !kc.ContextExists(op.Old) {
-		return errors.Errorf("context \"%s\" not found, can't rename it", op.Old)
+		return fmt.Errorf("context \"%s\" not found, can't rename it", op.Old)
 	}
 
 	if kc.ContextExists(op.New) {
 		printer.Warning(stderr, "context \"%s\" exists, overwriting it.", op.New)
 		if err := kc.DeleteContextEntry(op.New); err != nil {
-			return errors.Wrap(err, "failed to delete new context to overwrite it")
+			return fmt.Errorf("failed to delete new context to overwrite it: %w", err)
 		}
 	}
 
 	if err := kc.ModifyContextName(op.Old, op.New); err != nil {
-		return errors.Wrap(err, "failed to change context name")
+		return fmt.Errorf("failed to change context name: %w", err)
 	}
 	if op.Old == cur {
 		if err := kc.ModifyCurrentContext(op.New); err != nil {
-			return errors.Wrap(err, "failed to set current-context to new name")
+			return fmt.Errorf("failed to set current-context to new name: %w", err)
 		}
 	}
 	if err := kc.Save(); err != nil {
-		return errors.Wrap(err, "failed to save modified kubeconfig")
+		return fmt.Errorf("failed to save modified kubeconfig: %w", err)
 	}
 	printer.Success(stderr, "Context %s renamed to %s.",
 		printer.SuccessColor.Sprint(op.Old),

cmd/kubectx/shell.go

@@ -0,0 +1,134 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"runtime"
+
+	"github.com/fatih/color"
+
+	"github.com/ahmetb/kubectx/internal/env"
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// ShellOp indicates intention to start a scoped sub-shell for a context.
+type ShellOp struct {
+	Target string
+}
+
+func (op ShellOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
+
+	kubectlPath, err := resolveKubectl()
+	if err != nil {
+		return err
+	}
+
+	// Verify context exists and get current context for exit message
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return fmt.Errorf("kubeconfig error: %w", err)
+	}
+	if !kc.ContextExists(op.Target) {
+		return fmt.Errorf("no context exists with the name: \"%s\"", op.Target)
+	}
+	previousCtx := kc.GetCurrentContext()
+
+	// Extract minimal kubeconfig using kubectl
+	data, err := extractMinimalKubeconfig(kubectlPath, op.Target)
+	if err != nil {
+		return fmt.Errorf("failed to extract kubeconfig for context: %w", err)
+	}
+
+	// Write to temp file
+	tmpFile, err := os.CreateTemp("", "kubectx-shell-*.yaml")
+	if err != nil {
+		return fmt.Errorf("failed to create temp kubeconfig file: %w", err)
+	}
+	tmpPath := tmpFile.Name()
+	defer os.Remove(tmpPath)
+
+	if _, err := tmpFile.Write(data); err != nil {
+		tmpFile.Close()
+		return fmt.Errorf("failed to write temp kubeconfig: %w", err)
+	}
+	tmpFile.Close()
+
+	// Print entry message
+	badgeColor := color.New(color.BgRed, color.FgWhite, color.Bold)
+	printer.EnableOrDisableColor(badgeColor)
+	fmt.Fprintf(stderr, "%s kubectl context is %s in this shell — type 'exit' to leave.\n",
+		badgeColor.Sprint("[ISOLATED SHELL]"), printer.WarningColor.Sprint(op.Target))
+
+	// Detect and start shell
+	shellBin := detectShell()
+	cmd := exec.Command(shellBin)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Env = append(os.Environ(),
+		"KUBECONFIG="+tmpPath,
+		env.EnvIsolatedShell+"=1",
+	)
+
+	_ = cmd.Run()
+
+	// Print exit message
+	fmt.Fprintf(stderr, "%s kubectl context is now %s.\n",
+		badgeColor.Sprint("[ISOLATED SHELL EXITED]"), printer.WarningColor.Sprint(previousCtx))
+
+	return nil
+}
+
+func resolveKubectl() (string, error) {
+	if v := os.Getenv("KUBECTL"); v != "" {
+		return v, nil
+	}
+	path, err := exec.LookPath("kubectl")
+	if err != nil {
+		return "", fmt.Errorf("kubectl is required for --shell but was not found in PATH")
+	}
+	return path, nil
+}
+
+func extractMinimalKubeconfig(kubectlPath, contextName string) ([]byte, error) {
+	cmd := exec.Command(kubectlPath, "config", "view", "--minify", "--flatten",
+		"--context", contextName)
+	cmd.Env = os.Environ()
+	data, err := cmd.Output()
+	if err != nil {
+		return nil, fmt.Errorf("kubectl config view failed: %w", err)
+	}
+	return data, nil
+}
+
+func detectShell() string {
+	if runtime.GOOS == "windows" {
+		// cmd.exe always sets the PROMPT env var, so if it is present
+		// we can reliably assume we are running inside cmd.exe.
+		if os.Getenv("PROMPT") != "" {
+			return "cmd.exe"
+		}
+		// Otherwise assume PowerShell. PSModulePath is always set on
+		// Windows regardless of the shell, so it cannot be used as a
+		// discriminator; however the absence of PROMPT is a strong
+		// enough signal that we are in a PowerShell session.
+		if pwsh, err := exec.LookPath("pwsh"); err == nil {
+			return pwsh
+		}
+		if powershell, err := exec.LookPath("powershell"); err == nil {
+			return powershell
+		}
+		return "cmd.exe"
+	}
+	if v := os.Getenv("SHELL"); v != "" {
+		return v
+	}
+	return "/bin/sh"
+}

cmd/kubectx/shell_test.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"bytes"
+	"runtime"
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/env"
+)
+
+func Test_detectShell_unix(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("skipping unix shell detection test on windows")
+	}
+
+	tests := []struct {
+		name     string
+		shellEnv string
+		want     string
+	}{
+		{
+			name:     "SHELL env set",
+			shellEnv: "/bin/zsh",
+			want:     "/bin/zsh",
+		},
+		{
+			name:     "SHELL env empty, falls back to /bin/sh",
+			shellEnv: "",
+			want:     "/bin/sh",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("SHELL", tt.shellEnv)
+
+			got := detectShell()
+			if got != tt.want {
+				t.Errorf("detectShell() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_ShellOp_blockedWhenNested(t *testing.T) {
+	// Simulate being inside an isolated shell
+	t.Setenv(env.EnvIsolatedShell, "1")
+
+	op := ShellOp{Target: "some-context"}
+	var stdout, stderr bytes.Buffer
+	err := op.Run(&stdout, &stderr)
+
+	if err == nil {
+		t.Fatal("expected error when running ShellOp inside isolated shell, got nil")
+	}
+
+	want := "locked single-context shell to"
+	if !bytes.Contains([]byte(err.Error()), []byte(want)) {
+		// The error may not contain the context name if kubeconfig is not available,
+		// but it should still be blocked
+		want2 := "locked single-context shell"
+		if !bytes.Contains([]byte(err.Error()), []byte(want2)) {
+			t.Errorf("error message %q does not contain %q", err.Error(), want2)
+		}
+	}
+}
+
+func Test_resolveKubectl_envVar(t *testing.T) {
+	t.Setenv("KUBECTL", "/custom/path/kubectl")
+	got, err := resolveKubectl()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if got != "/custom/path/kubectl" {
+		t.Errorf("resolveKubectl() = %q, want %q", got, "/custom/path/kubectl")
+	}
+}
+
+func Test_resolveKubectl_inPath(t *testing.T) {
+	t.Setenv("KUBECTL", "")
+
+	// kubectl should be findable in PATH on most dev machines
+	got, err := resolveKubectl()
+	if err != nil {
+		t.Skip("kubectl not in PATH, skipping")
+	}
+	if got == "" {
+		t.Error("resolveKubectl() returned empty string")
+	}
+}
+
+func Test_checkIsolatedMode_notSet(t *testing.T) {
+	t.Setenv(env.EnvIsolatedShell, "")
+
+	err := checkIsolatedMode()
+	if err != nil {
+		t.Errorf("expected nil error when not in isolated mode, got: %v", err)
+	}
+}
+
+func Test_checkIsolatedMode_set(t *testing.T) {
+	t.Setenv(env.EnvIsolatedShell, "1")
+
+	err := checkIsolatedMode()
+	if err == nil {
+		t.Fatal("expected error when in isolated mode, got nil")
+	}
+
+	want := "locked single-context shell"
+	if !bytes.Contains([]byte(err.Error()), []byte(want)) {
+		t.Errorf("error message %q does not contain %q", err.Error(), want)
+	}
+}

cmd/kubectx/state.go

@@ -15,12 +15,11 @@
 package main
 
 import (
-	"io/ioutil"
+	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/cmdutil"
 )
 
@@ -35,7 +34,7 @@ func kubectxPrevCtxFile() (string, error) {
 // readLastContext returns the saved previous context
 // if the state file exists, otherwise returns "".
 func readLastContext(path string) (string, error) {
-	b, err := ioutil.ReadFile(path)
+	b, err := os.ReadFile(path)
 	if os.IsNotExist(err) {
 		return "", nil
 	}
@@ -47,7 +46,7 @@ func readLastContext(path string) (string, error) {
 func writeLastContext(path, value string) error {
 	dir := filepath.Dir(path)
 	if err := os.MkdirAll(dir, 0755); err != nil {
-		return errors.Wrap(err, "failed to create parent directories")
+		return fmt.Errorf("failed to create parent directories: %w", err)
 	}
-	return ioutil.WriteFile(path, []byte(value), 0644)
+	return os.WriteFile(path, []byte(value), 0644)
 }

cmd/kubectx/state_test.go

@@ -15,12 +15,9 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
-
-	"github.com/ahmetb/kubectx/internal/testutil"
 )
 
 func Test_readLastContext_nonExistingFile(t *testing.T) {
@@ -34,8 +31,11 @@ func Test_readLastContext_nonExistingFile(t *testing.T) {
 }
 
 func Test_readLastContext(t *testing.T) {
-	path, cleanup := testutil.TempFile(t, "foo")
-	defer cleanup()
+	dir := t.TempDir()
+	path := filepath.Join(dir, "testfile")
+	if err := os.WriteFile(path, []byte("foo"), 0644); err != nil {
+		t.Fatal(err)
+	}
 
 	s, err := readLastContext(path)
 	if err != nil {
@@ -55,10 +55,7 @@ func Test_writeLastContext_err(t *testing.T) {
 }
 
 func Test_writeLastContext(t *testing.T) {
-	dir, err := ioutil.TempDir(os.TempDir(), "state-file-test")
-	if err != nil {
-		t.Fatal(err)
-	}
+	dir := t.TempDir()
 	path := filepath.Join(dir, "foo", "bar")
 
 	if err := writeLastContext(path, "ctx1"); err != nil {
@@ -75,9 +72,7 @@ func Test_writeLastContext(t *testing.T) {
 }
 
 func Test_kubectxFilePath(t *testing.T) {
-	origHome := os.Getenv("HOME")
-	os.Setenv("HOME", filepath.FromSlash("/foo/bar"))
-	defer os.Setenv("HOME", origHome)
+	t.Setenv("HOME", filepath.FromSlash("/foo/bar"))
 
 	expected := filepath.Join(filepath.FromSlash("/foo/bar"), ".kube", "kubectx")
 	v, err := kubectxPrevCtxFile()
@@ -90,12 +85,8 @@ func Test_kubectxFilePath(t *testing.T) {
 }
 
 func Test_kubectxFilePath_error(t *testing.T) {
-	origHome := os.Getenv("HOME")
-	origUserprofile := os.Getenv("USERPROFILE")
-	os.Unsetenv("HOME")
-	os.Unsetenv("USERPROFILE")
-	defer os.Setenv("HOME", origHome)
-	defer os.Setenv("USERPROFILE", origUserprofile)
+	t.Setenv("HOME", "")
+	t.Setenv("USERPROFILE", "")
 
 	_, err := kubectxPrevCtxFile()
 	if err == nil {

cmd/kubectx/switch.go

@@ -15,10 +15,10 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"io"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
 	"github.com/ahmetb/kubectx/internal/printer"
 )
@@ -29,6 +29,9 @@ type SwitchOp struct {
 }
 
 func (op SwitchOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	var newCtx string
 	var err error
 	if op.Target == "-" {
@@ -37,39 +40,41 @@ func (op SwitchOp) Run(_, stderr io.Writer) error {
 		newCtx, err = switchContext(op.Target)
 	}
 	if err != nil {
-		return errors.Wrap(err, "failed to switch context")
+		return fmt.Errorf("failed to switch context: %w", err)
 	}
-	err = printer.Success(stderr, "Switched to context \"%s\".", printer.SuccessColor.Sprint(newCtx))
-	return errors.Wrap(err, "print error")
+	if err = printer.Success(stderr, "Switched to context \"%s\".", printer.SuccessColor.Sprint(newCtx)); err != nil {
+		return fmt.Errorf("print error: %w", err)
+	}
+	return nil
 }
 
 // switchContext switches to specified context name.
 func switchContext(name string) (string, error) {
 	prevCtxFile, err := kubectxPrevCtxFile()
 	if err != nil {
-		return "", errors.Wrap(err, "failed to determine state file")
+		return "", fmt.Errorf("failed to determine state file: %w", err)
 	}
 
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return "", errors.Wrap(err, "kubeconfig error")
+		return "", fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	prev := kc.GetCurrentContext()
 	if !kc.ContextExists(name) {
-		return "", errors.Errorf("no context exists with the name: \"%s\"", name)
+		return "", fmt.Errorf("no context exists with the name: \"%s\"", name)
 	}
 	if err := kc.ModifyCurrentContext(name); err != nil {
 		return "", err
 	}
 	if err := kc.Save(); err != nil {
-		return "", errors.Wrap(err, "failed to save kubeconfig")
+		return "", fmt.Errorf("failed to save kubeconfig: %w", err)
 	}
 
 	if prev != name {
 		if err := writeLastContext(prevCtxFile, prev); err != nil {
-			return "", errors.Wrap(err, "failed to save previous context name")
+			return "", fmt.Errorf("failed to save previous context name: %w", err)
 		}
 	}
 	return name, nil
@@ -79,11 +84,11 @@ func switchContext(name string) (string, error) {
 func swapContext() (string, error) {
 	prevCtxFile, err := kubectxPrevCtxFile()
 	if err != nil {
-		return "", errors.Wrap(err, "failed to determine state file")
+		return "", fmt.Errorf("failed to determine state file: %w", err)
 	}
 	prev, err := readLastContext(prevCtxFile)
 	if err != nil {
-		return "", errors.Wrap(err, "failed to read previous context file")
+		return "", fmt.Errorf("failed to read previous context file: %w", err)
 	}
 	if prev == "" {
 		return "", errors.New("no previous context found")

cmd/kubectx/unset.go

@@ -15,10 +15,9 @@
 package main
 
 import (
+	"fmt"
 	"io"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
 	"github.com/ahmetb/kubectx/internal/printer"
 )
@@ -27,19 +26,25 @@ import (
 type UnsetOp struct{}
 
 func (_ UnsetOp) Run(_, stderr io.Writer) error {
+	if err := checkIsolatedMode(); err != nil {
+		return err
+	}
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	if err := kc.UnsetCurrentContext(); err != nil {
-		return errors.Wrap(err, "error while modifying current-context")
+		return fmt.Errorf("error while modifying current-context: %w", err)
 	}
 	if err := kc.Save(); err != nil {
-		return errors.Wrap(err, "failed to save kubeconfig file after modification")
+		return fmt.Errorf("failed to save kubeconfig file after modification: %w", err)
 	}
 
 	err := printer.Success(stderr, "Active context unset for kubectl.")
-	return errors.Wrap(err, "write error")
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
 }

cmd/kubectx/version.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"io"
+)
+
+var (
+	version = "v0.0.0+unknown" // populated by goreleaser
+)
+
+// VersionOp describes printing version string.
+type VersionOp struct{}
+
+func (_ VersionOp) Run(stdout, _ io.Writer) error {
+	_, err := fmt.Fprintf(stdout, "%s\n", version)
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
+}

cmd/kubens/current.go

@@ -15,11 +15,10 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"io"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
 )
 
@@ -29,7 +28,7 @@ func (c CurrentOp) Run(stdout, _ io.Writer) error {
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	ctx := kc.GetCurrentContext()
@@ -38,8 +37,11 @@ func (c CurrentOp) Run(stdout, _ io.Writer) error {
 	}
 	ns, err := kc.NamespaceOfContext(ctx)
 	if err != nil {
-		return errors.Wrapf(err, "failed to read namespace of \"%s\"", ctx)
+		return fmt.Errorf("failed to read namespace of \"%s\": %w", ctx, err)
 	}
 	_, err = fmt.Fprintln(stdout, ns)
-	return errors.Wrap(err, "write error")
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
 }

cmd/kubens/flags.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"slices"
 	"strings"
 
 	"github.com/ahmetb/kubectx/internal/cmdutil"
@@ -33,25 +34,53 @@ func (op UnsupportedOp) Run(_, _ io.Writer) error {
 // parseArgs looks at flags (excl. executable name, i.e. argv[0])
 // and decides which operation should be taken.
 func parseArgs(argv []string) Op {
-	if len(argv) == 0 {
+	n := len(argv)
+
+	if n == 0 {
 		if cmdutil.IsInteractiveMode(os.Stdout) {
 			return InteractiveSwitchOp{SelfCmd: os.Args[0]}
 		}
 		return ListOp{}
 	}
 
-	if len(argv) == 1 {
+	if n == 1 {
 		v := argv[0]
-		if v == "--help" || v == "-h" {
+		switch v {
+		case "--help", "-h":
 			return HelpOp{}
-		}
-		if v == "--current" || v == "-c" {
+		case "--version", "-V":
+			return VersionOp{}
+		case "--current", "-c":
 			return CurrentOp{}
+		case "--unset", "-u":
+			return UnsetOp{}
+		default:
+			return getSwitchOp(v, false)
 		}
-		if strings.HasPrefix(v, "-") && v != "-" {
-			return UnsupportedOp{Err: fmt.Errorf("unsupported option '%s'", v)}
+	} else if n == 2 {
+		// {namespace} -f|--force
+		name := argv[0]
+		force := slices.Contains([]string{"-f", "--force"}, argv[1])
+
+		if !force {
+			if !slices.Contains([]string{"-f", "--force"}, argv[0]) {
+				return UnsupportedOp{Err: fmt.Errorf("unsupported arguments %q", argv)}
+			}
+
+			// -f|--force {namespace}
+			force = true
+			name = argv[1]
 		}
-		return SwitchOp{Target: argv[0]}
+
+		return getSwitchOp(name, force)
 	}
+
 	return UnsupportedOp{Err: fmt.Errorf("too many arguments")}
 }
+
+func getSwitchOp(v string, force bool) Op {
+	if strings.HasPrefix(v, "-") && v != "-" {
+		return UnsupportedOp{Err: fmt.Errorf("unsupported option %q", v)}
+	}
+	return SwitchOp{Target: v, Force: force}
+}

cmd/kubens/flags_test.go

@@ -45,15 +45,39 @@ func Test_parseArgs_new(t *testing.T) {
 		{name: "current long form",
 			args: []string{"--current"},
 			want: CurrentOp{}},
+		{name: "unset shorthand",
+			args: []string{"-u"},
+			want: UnsetOp{}},
+		{name: "unset long form",
+			args: []string{"--unset"},
+			want: UnsetOp{}},
 		{name: "switch by name",
 			args: []string{"foo"},
 			want: SwitchOp{Target: "foo"}},
+		{name: "switch by name force short flag",
+			args: []string{"foo", "-f"},
+			want: SwitchOp{Target: "foo", Force: true}},
+		{name: "switch by name force long flag",
+			args: []string{"foo", "--force"},
+			want: SwitchOp{Target: "foo", Force: true}},
+		{name: "switch by name force short flag before name",
+			args: []string{"-f", "foo"},
+			want: SwitchOp{Target: "foo", Force: true}},
+		{name: "switch by name force long flag before name",
+			args: []string{"--force", "foo"},
+			want: SwitchOp{Target: "foo", Force: true}},
+		{name: "switch by name unknown arguments",
+			args: []string{"foo", "-x"},
+			want: UnsupportedOp{Err: fmt.Errorf("unsupported arguments %q", []string{"foo", "-x"})}},
+		{name: "switch by name unknown arguments",
+			args: []string{"-x", "foo"},
+			want: UnsupportedOp{Err: fmt.Errorf("unsupported arguments %q", []string{"-x", "foo"})}},
 		{name: "switch by swap",
 			args: []string{"-"},
 			want: SwitchOp{Target: "-"}},
 		{name: "unrecognized flag",
 			args: []string{"-x"},
-			want: UnsupportedOp{Err: fmt.Errorf("unsupported option '-x'")}},
+			want: UnsupportedOp{Err: fmt.Errorf("unsupported option %q", "-x")}},
 		{name: "too many args",
 			args: []string{"a", "b", "c"},
 			want: UnsupportedOp{Err: fmt.Errorf("too many arguments")}},

cmd/kubens/fzf.go

@@ -16,14 +16,13 @@ package main
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"os"
 	"os/exec"
 	"strings"
 
-	"github.com/pkg/errors"
-
 	"github.com/ahmetb/kubectx/internal/cmdutil"
 	"github.com/ahmetb/kubectx/internal/env"
 	"github.com/ahmetb/kubectx/internal/kubeconfig"
@@ -43,7 +42,7 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 			printer.Warning(stderr, "kubeconfig file not found")
 			return nil
 		}
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 	defer kc.Close()
 
@@ -57,7 +56,8 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 		fmt.Sprintf("FZF_DEFAULT_COMMAND=%s", op.SelfCmd),
 		fmt.Sprintf("%s=1", env.EnvForceColor))
 	if err := cmd.Run(); err != nil {
-		if _, ok := err.(*exec.ExitError); !ok {
+		var exitErr *exec.ExitError
+		if !errors.As(err, &exitErr) {
 			return err
 		}
 	}
@@ -65,9 +65,9 @@ func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
 	if choice == "" {
 		return errors.New("you did not choose any of the options")
 	}
-	name, err := switchNamespace(kc, choice)
+	name, err := switchNamespace(kc, choice, false)
 	if err != nil {
-		return errors.Wrap(err, "failed to switch namespace")
+		return fmt.Errorf("failed to switch namespace: %w", err)
 	}
 	printer.Success(stderr, "Active namespace is \"%s\".", printer.SuccessColor.Sprint(name))
 	return nil

cmd/kubens/help.go

@@ -20,8 +20,6 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-
-	"github.com/pkg/errors"
 )
 
 // HelpOp describes printing help.
@@ -35,15 +33,21 @@ func printUsage(out io.Writer) error {
 	help := `USAGE:
   %PROG%                    : list the namespaces in the current context
   %PROG% <NAME>             : change the active namespace of current context
+  %PROG% <NAME> --force/-f  : force change the active namespace of current context (even if it doesn't exist)
   %PROG% -                  : switch to the previous namespace in this context
   %PROG% -c, --current      : show the current namespace
   %PROG% -h,--help          : show this message
-`
+  %PROG% -u,--unset         : unset the namespace choice (set to 'default')
+  %PROG% -V,--version       : show version`
+
 	// TODO this replace logic is duplicated between this and kubectx
 	help = strings.ReplaceAll(help, "%PROG%", selfName())
 
 	_, err := fmt.Fprintf(out, "%s\n", help)
-	return errors.Wrap(err, "write error")
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
 }
 
 // selfName guesses how the user invoked the program.

cmd/kubens/list.go

@@ -16,11 +16,11 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"os"
 
-	"github.com/pkg/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	_ "k8s.io/client-go/plugin/pkg/client/auth"
@@ -36,7 +36,7 @@ func (op ListOp) Run(stdout, stderr io.Writer) error {
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
 	ctx := kc.GetCurrentContext()
@@ -45,12 +45,12 @@ func (op ListOp) Run(stdout, stderr io.Writer) error {
 	}
 	curNs, err := kc.NamespaceOfContext(ctx)
 	if err != nil {
-		return errors.Wrap(err, "cannot read current namespace")
+		return fmt.Errorf("cannot read current namespace: %w", err)
 	}
 
 	ns, err := queryNamespaces(kc)
 	if err != nil {
-		return errors.Wrap(err, "could not list namespaces (is the cluster accessible?)")
+		return fmt.Errorf("could not list namespaces (is the cluster accessible?): %w", err)
 	}
 
 	for _, c := range ns {
@@ -70,7 +70,7 @@ func queryNamespaces(kc *kubeconfig.Kubeconfig) ([]string, error) {
 
 	clientset, err := newKubernetesClientSet(kc)
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to initialize k8s REST client")
+		return nil, fmt.Errorf("failed to initialize k8s REST client: %w", err)
 	}
 
 	var out []string
@@ -83,7 +83,7 @@ func queryNamespaces(kc *kubeconfig.Kubeconfig) ([]string, error) {
 				Continue: next,
 			})
 		if err != nil {
-			return nil, errors.Wrap(err, "failed to list namespaces from k8s API")
+			return nil, fmt.Errorf("failed to list namespaces from k8s API: %w", err)
 		}
 		next = list.Continue
 		for _, it := range list.Items {
@@ -99,11 +99,11 @@ func queryNamespaces(kc *kubeconfig.Kubeconfig) ([]string, error) {
 func newKubernetesClientSet(kc *kubeconfig.Kubeconfig) (*kubernetes.Clientset, error) {
 	b, err := kc.Bytes()
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to convert in-memory kubeconfig to yaml")
+		return nil, fmt.Errorf("failed to convert in-memory kubeconfig to yaml: %w", err)
 	}
 	cfg, err := clientcmd.RESTConfigFromKubeConfig(b)
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to initialize config")
+		return nil, fmt.Errorf("failed to initialize config: %w", err)
 	}
 	return kubernetes.NewForConfig(cfg)
 }

cmd/kubens/main.go

@@ -33,7 +33,7 @@ func main() {
 	cmdutil.PrintDeprecatedEnvWarnings(color.Error, os.Environ())
 	op := parseArgs(os.Args[1:])
 	if err := op.Run(color.Output, color.Error); err != nil {
-		printer.Error(color.Error, err.Error())
+		printer.Error(color.Error, "%s", err)
 
 		if _, ok := os.LookupEnv(env.EnvDebug); ok {
 			// print stack trace in verbose mode

cmd/kubens/statefile.go

@@ -16,7 +16,6 @@ package main
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -45,7 +44,7 @@ func (f NSFile) path() string {
 
 // Load reads the previous namespace setting, or returns empty if not exists.
 func (f NSFile) Load() (string, error) {
-	b, err := ioutil.ReadFile(f.path())
+	b, err := os.ReadFile(f.path())
 	if err != nil {
 		if os.IsNotExist(err) {
 			return "", nil
@@ -61,7 +60,7 @@ func (f NSFile) Save(value string) error {
 	if err := os.MkdirAll(d, 0755); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(f.path(), []byte(value), 0644)
+	return os.WriteFile(f.path(), []byte(value), 0644)
 }
 
 // isWindows determines if the process is running on windows OS.

cmd/kubens/statefile_test.go

@@ -15,8 +15,6 @@
 package main
 
 import (
-	"io/ioutil"
-	"os"
 	"runtime"
 	"strings"
 	"testing"
@@ -25,11 +23,7 @@ import (
 )
 
 func TestNSFile(t *testing.T) {
-	td, err := ioutil.TempDir(os.TempDir(), "")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(td)
+	td := t.TempDir()
 
 	f := NewNSFile("foo")
 	f.dir = td

cmd/kubens/switch.go

@@ -16,10 +16,11 @@ package main
 
 import (
 	"context"
+	"errors"
+	"fmt"
 	"io"
 	"os"
 
-	"github.com/pkg/errors"
 	errors2 "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
@@ -29,16 +30,17 @@ import (
 
 type SwitchOp struct {
 	Target string // '-' for back and forth, or NAME
+	Force  bool   // force switch even if the namespace doesn't exist
 }
 
 func (s SwitchOp) Run(_, stderr io.Writer) error {
 	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
 	defer kc.Close()
 	if err := kc.Parse(); err != nil {
-		return errors.Wrap(err, "kubeconfig error")
+		return fmt.Errorf("kubeconfig error: %w", err)
 	}
 
-	toNS, err := switchNamespace(kc, s.Target)
+	toNS, err := switchNamespace(kc, s.Target, s.Force)
 	if err != nil {
 		return err
 	}
@@ -46,46 +48,48 @@ func (s SwitchOp) Run(_, stderr io.Writer) error {
 	return err
 }
 
-func switchNamespace(kc *kubeconfig.Kubeconfig, ns string) (string, error) {
+func switchNamespace(kc *kubeconfig.Kubeconfig, ns string, force bool) (string, error) {
 	ctx := kc.GetCurrentContext()
 	if ctx == "" {
 		return "", errors.New("current-context is not set")
 	}
 	curNS, err := kc.NamespaceOfContext(ctx)
 	if err != nil {
-		return "", errors.Wrap(err, "failed to get current namespace")
+		return "", fmt.Errorf("failed to get current namespace: %w", err)
 	}
 
 	f := NewNSFile(ctx)
 	prev, err := f.Load()
 	if err != nil {
-		return "", errors.Wrap(err, "failed to load previous namespace from file")
+		return "", fmt.Errorf("failed to load previous namespace from file: %w", err)
 	}
 
 	if ns == "-" {
 		if prev == "" {
-			return "", errors.Errorf("No previous namespace found for current context (%s)", ctx)
+			return "", fmt.Errorf("No previous namespace found for current context (%s)", ctx)
 		}
 		ns = prev
 	}
 
-	ok, err := namespaceExists(kc, ns)
-	if err != nil {
-		return "", errors.Wrap(err, "failed to query if namespace exists (is cluster accessible?)")
-	}
-	if !ok {
-		return "", errors.Errorf("no namespace exists with name \"%s\"", ns)
+	if !force {
+		ok, err := namespaceExists(kc, ns)
+		if err != nil {
+			return "", fmt.Errorf("failed to query if namespace exists (is cluster accessible?): %w", err)
+		}
+		if !ok {
+			return "", fmt.Errorf("no namespace exists with name \"%s\"", ns)
+		}
 	}
 
 	if err := kc.SetNamespace(ctx, ns); err != nil {
-		return "", errors.Wrapf(err, "failed to change to namespace \"%s\"", ns)
+		return "", fmt.Errorf("failed to change to namespace \"%s\": %w", ns, err)
 	}
 	if err := kc.Save(); err != nil {
-		return "", errors.Wrap(err, "failed to save kubeconfig file")
+		return "", fmt.Errorf("failed to save kubeconfig file: %w", err)
 	}
 	if curNS != ns {
 		if err := f.Save(curNS); err != nil {
-			return "", errors.Wrap(err, "failed to save the previous namespace to file")
+			return "", fmt.Errorf("failed to save the previous namespace to file: %w", err)
 		}
 	}
 	return ns, nil
@@ -99,13 +103,15 @@ func namespaceExists(kc *kubeconfig.Kubeconfig, ns string) (bool, error) {
 
 	clientset, err := newKubernetesClientSet(kc)
 	if err != nil {
-		return false, errors.Wrap(err, "failed to initialize k8s REST client")
+		return false, fmt.Errorf("failed to initialize k8s REST client: %w", err)
 	}
 
 	namespace, err := clientset.CoreV1().Namespaces().Get(context.Background(), ns, metav1.GetOptions{})
 	if errors2.IsNotFound(err) {
 		return false, nil
 	}
-	return namespace != nil, errors.Wrapf(err, "failed to query "+
-		"namespace %q from k8s API", ns)
+	if err != nil {
+		return false, fmt.Errorf("failed to query namespace %q from k8s API: %w", ns, err)
+	}
+	return namespace != nil, nil
 }

cmd/kubens/unset.go

@@ -0,0 +1,58 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// UnsetOp indicates intention to remove current namespace preference.
+type UnsetOp struct{}
+
+func (_ UnsetOp) Run(_, stderr io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return fmt.Errorf("kubeconfig error: %w", err)
+	}
+
+	ns, err := clearNamespace(kc)
+	if err != nil {
+		return err
+	}
+	err = printer.Success(stderr, "Active namespace is \"%s\".", printer.SuccessColor.Sprint(ns))
+	return err
+}
+
+func clearNamespace(kc *kubeconfig.Kubeconfig) (string, error) {
+	ctx := kc.GetCurrentContext()
+	ns := "default"
+	if ctx == "" {
+		return "", errors.New("current-context is not set")
+	}
+
+	if err := kc.SetNamespace(ctx, ns); err != nil {
+		return "", fmt.Errorf("failed to clear namespace: %w", err)
+	}
+	if err := kc.Save(); err != nil {
+		return "", fmt.Errorf("failed to save kubeconfig file: %w", err)
+	}
+	return ns, nil
+}

cmd/kubens/version.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"io"
+)
+
+var (
+	version = "v0.0.0+unknown" // populated by goreleaser
+)
+
+// VersionOp describes printing version string.
+type VersionOp struct{}
+
+func (_ VersionOp) Run(stdout, _ io.Writer) error {
+	_, err := fmt.Fprintf(stdout, "%s\n", version)
+	if err != nil {
+		return fmt.Errorf("write error: %w", err)
+	}
+	return nil
+}

completion/_kubectx.zsh

@@ -3,7 +3,9 @@
 local KUBECTX="${HOME}/.kube/kubectx"
 PREV=""
 
-local all_contexts="$(kubectl config get-contexts --output='name')"
+local context_array=("${(@f)$(kubectl config get-contexts --output='name')}")
+local all_contexts=(\'${^context_array}\')
+
 if [ -f "$KUBECTX" ]; then
     # show '-' only if there's a saved previous context
     local PREV=$(cat "${KUBECTX}")

go.mod

@@ -1,15 +1,55 @@
 module github.com/ahmetb/kubectx
 
-go 1.14
+go 1.25.0
 
 require (
 	facette.io/natsort v0.0.0-20181210072756-2cd4dd1e2dcb
-	github.com/fatih/color v1.9.0
-	github.com/google/go-cmp v0.5.2
-	github.com/imdario/mergo v0.3.9 // indirect
-	github.com/mattn/go-isatty v0.0.12
-	github.com/pkg/errors v0.9.1
-	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c
-	k8s.io/apimachinery v0.21.0-alpha.1
-	k8s.io/client-go v0.21.0-alpha.1
+	github.com/fatih/color v1.18.0
+	github.com/google/go-cmp v0.7.0
+	github.com/mattn/go-isatty v0.0.20
+	k8s.io/apimachinery v0.35.2
+	k8s.io/client-go v0.35.2
+	sigs.k8s.io/kustomize/kyaml v0.21.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
+	github.com/go-errors/errors v1.4.2 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/google/gnostic-models v0.7.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/oauth2 v0.30.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/term v0.37.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	golang.org/x/time v0.9.0 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
+	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.35.2 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 // indirect
+	k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 // indirect
+	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
+	sigs.k8s.io/randfill v1.0.0 // indirect
+	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
+	sigs.k8s.io/yaml v1.6.0 // indirect
 )

go.sum

@@ -1,438 +1,144 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0 h1:3ithwDMr7/3vpAMXiH+ZQnYbuIsh+OPhUPMFC9enmn0=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
-cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 facette.io/natsort v0.0.0-20181210072756-2cd4dd1e2dcb h1:1pSweJFeR3Pqx7uoelppkzeegfUBXL6I2FFAbfXw570=
 facette.io/natsort v0.0.0-20181210072756-2cd4dd1e2dcb/go.mod h1:npRYmtaITVom7rcSo+pRURltHSG2r4TQM1cdqJ2dUB0=
-github.com/Azure/go-autorest v14.2.0+incompatible h1:V5VMDjClD3GiElqLWO7mz2MxNAK/vTfRHdAubSIPRgs=
-github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
-github.com/Azure/go-autorest/autorest v0.11.12 h1:gI8ytXbxMfI+IVbI9mP2JGCTXIuhHLgRlvQ9X4PsnHE=
-github.com/Azure/go-autorest/autorest v0.11.12/go.mod h1:eipySxLmqSyC5s5k1CLupqet0PSENBEDP93LQ9a8QYw=
-github.com/Azure/go-autorest/autorest/adal v0.9.5 h1:Y3bBUV4rTuxenJJs41HU3qmqsb+auo+a3Lz+PlJPpL0=
-github.com/Azure/go-autorest/autorest/adal v0.9.5/go.mod h1:B7KF7jKIeC9Mct5spmyCB/A8CG/sEz1vwIRGv/bbw7A=
-github.com/Azure/go-autorest/autorest/date v0.3.0 h1:7gUk1U5M/CQbp9WoqinNzJar+8KY+LPI6wiWrP/myHw=
-github.com/Azure/go-autorest/autorest/date v0.3.0/go.mod h1:BI0uouVdmngYNUzGWeSYnokU+TrmwEsOqdt8Y6sso74=
-github.com/Azure/go-autorest/autorest/mocks v0.4.1 h1:K0laFcLE6VLTOwNgSxaGbUcLPuGXlNkbVvq4cW4nIHk=
-github.com/Azure/go-autorest/autorest/mocks v0.4.1/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k=
-github.com/Azure/go-autorest/logger v0.2.0 h1:e4RVHVZKC5p6UANLJHkM4OfR1UKZPj8Wt8Pcx+3oqrE=
-github.com/Azure/go-autorest/logger v0.2.0/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
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+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+k8s.io/api v0.35.2 h1:tW7mWc2RpxW7HS4CoRXhtYHSzme1PN1UjGHJ1bdrtdw=
+k8s.io/api v0.35.2/go.mod h1:7AJfqGoAZcwSFhOjcGM7WV05QxMMgUaChNfLTXDRE60=
+k8s.io/apimachinery v0.35.2 h1:NqsM/mmZA7sHW02JZ9RTtk3wInRgbVxL8MPfzSANAK8=
+k8s.io/apimachinery v0.35.2/go.mod h1:jQCgFZFR1F4Ik7hvr2g84RTJSZegBc8yHgFWKn//hns=
+k8s.io/client-go v0.35.2 h1:YUfPefdGJA4aljDdayAXkc98DnPkIetMl4PrKX97W9o=
+k8s.io/client-go v0.35.2/go.mod h1:4QqEwh4oQpeK8AaefZ0jwTFJw/9kIjdQi0jpKeYvz7g=
+k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
+k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
+k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 h1:Y3gxNAuB0OBLImH611+UDZcmKS3g6CthxToOb37KgwE=
+k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912/go.mod h1:kdmbQkyfwUagLfXIad1y2TdrjPFWp2Q89B3qkRwf/pQ=
+k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 h1:SjGebBtkBqHFOli+05xYbK8YF1Dzkbzn+gDM4X9T4Ck=
+k8s.io/utils v0.0.0-20251002143259-bc988d571ff4/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
+sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5EXP7sU1kvOlxwZh5txg=
+sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
+sigs.k8s.io/kustomize/kyaml v0.21.1 h1:IVlbmhC076nf6foyL6Taw4BkrLuEsXUXNpsE+ScX7fI=
+sigs.k8s.io/kustomize/kyaml v0.21.1/go.mod h1:hmxADesM3yUN2vbA5z1/YTBnzLJ1dajdqpQonwBL1FQ=
+sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=
+sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY=
+sigs.k8s.io/structured-merge-diff/v6 v6.3.0 h1:jTijUJbW353oVOd9oTlifJqOGEkUw2jB/fXCbTiQEco=
+sigs.k8s.io/structured-merge-diff/v6 v6.3.0/go.mod h1:M3W8sfWvn2HhQDIbGWj3S099YozAsymCo/wrT5ohRUE=
+sigs.k8s.io/yaml v1.6.0 h1:G8fkbMSAFqgEFgh4b1wmtzDnioxFCUgTZhlbj5P9QYs=
+sigs.k8s.io/yaml v1.6.0/go.mod h1:796bPqUfzR/0jLAl6XjHl3Ck7MiyVv8dbTdyT3/pMf4=

internal/cmdutil/util.go

@@ -15,15 +15,11 @@
 package cmdutil
 
 import (
+	"errors"
 	"os"
-
-	"github.com/pkg/errors"
 )
 
 func HomeDir() string {
-	if v := os.Getenv("XDG_CACHE_HOME"); v != "" {
-		return v
-	}
 	home := os.Getenv("HOME")
 	if home == "" {
 		home = os.Getenv("USERPROFILE") // windows
@@ -31,8 +27,7 @@ func HomeDir() string {
 	return home
 }
 
-// IsNotFoundErr determines if the underlying error is os.IsNotExist. Right now
-// errors from github.com/pkg/errors doesn't work with os.IsNotExist.
+// IsNotFoundErr determines if the underlying error is os.IsNotExist.
 func IsNotFoundErr(err error) bool {
 	for e := err; e != nil; e = errors.Unwrap(e) {
 		if os.IsNotExist(e) {

internal/cmdutil/util_test.go

@@ -28,12 +28,12 @@ func Test_homeDir(t *testing.T) {
 		want string
 	}{
 		{
-			name: "XDG_CACHE_HOME precedence",
+			name: "don't use XDG_CACHE_HOME as homedir",
 			envs: []env{
 				{"XDG_CACHE_HOME", "xdg"},
 				{"HOME", "home"},
 			},
-			want: "xdg",
+			want: "home",
 		},
 		{
 			name: "HOME over USERPROFILE",
@@ -46,7 +46,6 @@ func Test_homeDir(t *testing.T) {
 		{
 			name: "only USERPROFILE available",
 			envs: []env{
-				{"XDG_CACHE_HOME", ""},
 				{"HOME", ""},
 				{"USERPROFILE", "up"},
 			},
@@ -55,7 +54,6 @@ func Test_homeDir(t *testing.T) {
 		{
 			name: "none available",
 			envs: []env{
-				{"XDG_CACHE_HOME", ""},
 				{"HOME", ""},
 				{"USERPROFILE", ""},
 			},

internal/env/constants.go

@@ -19,7 +19,7 @@ const (
 	// interactive context selection when fzf is installed.
 	EnvFZFIgnore = "KUBECTX_IGNORE_FZF"
 
-	// EnvForceColor describes the environment variable to disable color usage
+	// EnvNoColor describes the environment variable to disable color usage
 	// when printing current context in a list.
 	EnvNoColor = `NO_COLOR`
 
@@ -29,4 +29,6 @@ const (
 
 	// EnvDebug describes the internal environment variable for more verbose logging.
 	EnvDebug = `DEBUG`
+
+	EnvIsolatedShell = "KUBECTX_ISOLATED_SHELL"
 )

internal/kubeconfig/contextmodify.go

@@ -15,8 +15,9 @@
 package kubeconfig
 
 import (
-	"github.com/pkg/errors"
-	"gopkg.in/yaml.v3"
+	"errors"
+
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 func (k *Kubeconfig) DeleteContextEntry(deleteName string) error {
@@ -24,60 +25,34 @@ func (k *Kubeconfig) DeleteContextEntry(deleteName string) error {
 	if err != nil {
 		return err
 	}
-
-	i := -1
-	for j, ctxNode := range contexts.Content {
-		nameNode := valueOf(ctxNode, "name")
-		if nameNode != nil && nameNode.Kind == yaml.ScalarNode && nameNode.Value == deleteName {
-			i = j
-			break
-		}
-	}
-	if i >= 0 {
-		copy(contexts.Content[i:], contexts.Content[i+1:])
-		contexts.Content[len(contexts.Content)-1] = nil
-		contexts.Content = contexts.Content[:len(contexts.Content)-1]
+	if err := contexts.PipeE(
+		yaml.ElementSetter{
+			Keys:   []string{"name"},
+			Values: []string{deleteName},
+		},
+	); err != nil {
+		return err
 	}
 	return nil
 }
 
 func (k *Kubeconfig) ModifyCurrentContext(name string) error {
-	currentCtxNode := valueOf(k.rootNode, "current-context")
-	if currentCtxNode != nil {
-		currentCtxNode.Value = name
-		return nil
+	if err := k.config.PipeE(yaml.SetField("current-context", yaml.NewScalarRNode(name))); err != nil {
+		return err
 	}
-
-	// if current-context field doesn't exist, create new field
-	keyNode := &yaml.Node{
-		Kind:  yaml.ScalarNode,
-		Value: "current-context",
-		Tag:   "!!str"}
-	valueNode := &yaml.Node{
-		Kind:  yaml.ScalarNode,
-		Value: name,
-		Tag:   "!!str"}
-	k.rootNode.Content = append(k.rootNode.Content, keyNode, valueNode)
 	return nil
 }
 
 func (k *Kubeconfig) ModifyContextName(old, new string) error {
-	contexts, err := k.contextsNode()
+	context, err := k.config.Pipe(yaml.Lookup("contexts", "[name="+old+"]"))
 	if err != nil {
 		return err
 	}
-
-	var changed bool
-	for _, contextNode := range contexts.Content {
-		nameNode := valueOf(contextNode, "name")
-		if nameNode.Kind == yaml.ScalarNode && nameNode.Value == old {
-			nameNode.Value = new
-			changed = true
-			break
-		}
+	if context == nil {
+		return errors.New("\"contexts\" entry is nil")
 	}
-	if !changed {
-		return errors.New("no changes were made")
+	if err := context.PipeE(yaml.SetField("name", yaml.NewScalarRNode(new))); err != nil {
+		return err
 	}
 	return nil
 }

internal/kubeconfig/contexts.go

@@ -15,72 +15,53 @@
 package kubeconfig
 
 import (
-	"github.com/pkg/errors"
-	"gopkg.in/yaml.v3"
+	"errors"
+	"fmt"
+	"slices"
+
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
-func (k *Kubeconfig) contextsNode() (*yaml.Node, error) {
-	contexts := valueOf(k.rootNode, "contexts")
+func (k *Kubeconfig) contextsNode() (*yaml.RNode, error) {
+	contexts, err := k.config.Pipe(yaml.Get("contexts"))
+	if err != nil {
+		return nil, err
+	}
 	if contexts == nil {
 		return nil, errors.New("\"contexts\" entry is nil")
-	} else if contexts.Kind != yaml.SequenceNode {
+	} else if contexts.YNode().Kind != yaml.SequenceNode {
 		return nil, errors.New("\"contexts\" is not a sequence node")
 	}
 	return contexts, nil
 }
 
-func (k *Kubeconfig) contextNode(name string) (*yaml.Node, error) {
+func (k *Kubeconfig) contextNode(name string) (*yaml.RNode, error) {
 	contexts, err := k.contextsNode()
 	if err != nil {
 		return nil, err
 	}
-
-	for _, contextNode := range contexts.Content {
-		nameNode := valueOf(contextNode, "name")
-		if nameNode.Kind == yaml.ScalarNode && nameNode.Value == name {
-			return contextNode, nil
-		}
+	context, err := contexts.Pipe(yaml.Lookup("[name=" + name + "]"))
+	if err != nil {
+		return nil, err
 	}
-	return nil, errors.Errorf("context with name \"%s\" not found", name)
+	if context == nil {
+		return nil, fmt.Errorf("context with name \"%s\" not found", name)
+	}
+	return context, nil
 }
 
 func (k *Kubeconfig) ContextNames() []string {
-	contexts := valueOf(k.rootNode, "contexts")
-	if contexts == nil {
+	contexts, err := k.config.Pipe(yaml.Get("contexts"))
+	if err != nil {
 		return nil
 	}
-	if contexts.Kind != yaml.SequenceNode {
+	names, err := contexts.ElementValues("name")
+	if err != nil {
 		return nil
 	}
-
-	var ctxNames []string
-	for _, ctx := range contexts.Content {
-		nameVal := valueOf(ctx, "name")
-		if nameVal != nil {
-			ctxNames = append(ctxNames, nameVal.Value)
-		}
-	}
-	return ctxNames
+	return names
 }
 
 func (k *Kubeconfig) ContextExists(name string) bool {
-	ctxNames := k.ContextNames()
-	for _, v := range ctxNames {
-		if v == name {
-			return true
-		}
-	}
-	return false
-}
-
-func valueOf(mapNode *yaml.Node, key string) *yaml.Node {
-	if mapNode.Kind != yaml.MappingNode {
-		return nil
-	}
-	for i, ch := range mapNode.Content {
-		if i%2 == 0 && ch.Kind == yaml.ScalarNode && ch.Value == key {
-			return mapNode.Content[i+1]
-		}
-	}
-	return nil
+	return slices.Contains(k.ContextNames(), name)
 }

internal/kubeconfig/currentcontext.go

@@ -14,18 +14,20 @@
 
 package kubeconfig
 
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
 // GetCurrentContext returns "current-context" value in given
 // kubeconfig object Node, or returns "" if not found.
 func (k *Kubeconfig) GetCurrentContext() string {
-	v := valueOf(k.rootNode, "current-context")
-	if v == nil {
+	v, err := k.config.Pipe(yaml.Get("current-context"))
+	if err != nil {
 		return ""
 	}
-	return v.Value
+	return yaml.GetValue(v)
 }
 
 func (k *Kubeconfig) UnsetCurrentContext() error {
-	curCtxValNode := valueOf(k.rootNode, "current-context")
-	curCtxValNode.Value = ""
-	return nil
+	return k.config.PipeE(yaml.SetField("current-context", yaml.NewStringRNode("")))
 }

internal/kubeconfig/kubeconfig.go

@@ -15,10 +15,11 @@
 package kubeconfig
 
 import (
+	"errors"
+	"fmt"
 	"io"
 
-	"github.com/pkg/errors"
-	"gopkg.in/yaml.v3"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 type ReadWriteResetCloser interface {
@@ -35,8 +36,8 @@ type Loader interface {
 type Kubeconfig struct {
 	loader Loader
 
-	f        ReadWriteResetCloser
-	rootNode *yaml.Node
+	f      ReadWriteResetCloser
+	config *yaml.RNode
 }
 
 func (k *Kubeconfig) WithLoader(l Loader) *Kubeconfig {
@@ -54,7 +55,7 @@ func (k *Kubeconfig) Close() error {
 func (k *Kubeconfig) Parse() error {
 	files, err := k.loader.Load()
 	if err != nil {
-		return errors.Wrap(err, "failed to load")
+		return fmt.Errorf("failed to load: %w", err)
 	}
 
 	// TODO since we don't support multiple kubeconfig files at the moment, there's just 1 file
@@ -63,24 +64,28 @@ func (k *Kubeconfig) Parse() error {
 	k.f = f
 	var v yaml.Node
 	if err := yaml.NewDecoder(f).Decode(&v); err != nil {
-		return errors.Wrap(err, "failed to decode")
+		return fmt.Errorf("failed to decode: %w", err)
 	}
-	k.rootNode = v.Content[0]
-	if k.rootNode.Kind != yaml.MappingNode {
+	k.config = yaml.NewRNode(&v)
+	if k.config.YNode().Kind != yaml.MappingNode {
 		return errors.New("kubeconfig file is not a map document")
 	}
 	return nil
 }
 
 func (k *Kubeconfig) Bytes() ([]byte, error) {
-	return yaml.Marshal(k.rootNode)
+	str, err := k.config.String()
+	if err != nil {
+		return nil, err
+	}
+	return []byte(str), nil
 }
 
 func (k *Kubeconfig) Save() error {
 	if err := k.f.Reset(); err != nil {
-		return errors.Wrap(err, "failed to reset file")
+		return fmt.Errorf("failed to reset file: %w", err)
 	}
 	enc := yaml.NewEncoder(k.f)
 	enc.SetIndent(0)
-	return enc.Encode(k.rootNode)
+	return enc.Encode(k.config.YNode())
 }

internal/kubeconfig/kubeconfigloader.go

@@ -15,11 +15,12 @@
 package kubeconfig
 
 import (
-	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 
-	"github.com/pkg/errors"
+	"github.com/ahmetb/kubectx/internal/cmdutil"
 )
 
 var (
@@ -33,15 +34,15 @@ type kubeconfigFile struct{ *os.File }
 func (*StandardKubeconfigLoader) Load() ([]ReadWriteResetCloser, error) {
 	cfgPath, err := kubeconfigPath()
 	if err != nil {
-		return nil, errors.Wrap(err, "cannot determine kubeconfig path")
+		return nil, fmt.Errorf("cannot determine kubeconfig path: %w", err)
 	}
 
 	f, err := os.OpenFile(cfgPath, os.O_RDWR, 0)
 	if err != nil {
 		if os.IsNotExist(err) {
-			return nil, errors.Wrap(err, "kubeconfig file not found")
+			return nil, fmt.Errorf("kubeconfig file not found: %w", err)
 		}
-		return nil, errors.Wrap(err, "failed to open file")
+		return nil, fmt.Errorf("failed to open file: %w", err)
 	}
 
 	// TODO we'll return all kubeconfig files when we start implementing multiple kubeconfig support
@@ -50,10 +51,12 @@ func (*StandardKubeconfigLoader) Load() ([]ReadWriteResetCloser, error) {
 
 func (kf *kubeconfigFile) Reset() error {
 	if err := kf.Truncate(0); err != nil {
-		return errors.Wrap(err, "failed to truncate file")
+		return fmt.Errorf("failed to truncate file: %w", err)
 	}
-	_, err := kf.Seek(0, 0)
-	return errors.Wrap(err, "failed to seek in file")
+	if _, err := kf.Seek(0, 0); err != nil {
+		return fmt.Errorf("failed to seek in file: %w", err)
+	}
+	return nil
 }
 
 func kubeconfigPath() (string, error) {

internal/kubeconfig/namespace.go

@@ -14,7 +14,9 @@
 
 package kubeconfig
 
-import "gopkg.in/yaml.v3"
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
 
 const (
 	defaultNamespace = "default"
@@ -25,53 +27,23 @@ func (k *Kubeconfig) NamespaceOfContext(contextName string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	ctxBody := valueOf(ctx, "context")
-	if ctxBody == nil {
-		return defaultNamespace, nil
+	namespace, err := ctx.Pipe(yaml.Lookup("context", "namespace"))
+	if namespace == nil || err != nil {
+		return defaultNamespace, err
 	}
-	ns := valueOf(ctxBody, "namespace")
-	if ns == nil || ns.Value == "" {
-		return defaultNamespace, nil
-	}
-	return ns.Value, nil
+	return yaml.GetValue(namespace), nil
 }
 
 func (k *Kubeconfig) SetNamespace(ctxName string, ns string) error {
-	ctxNode, err := k.contextNode(ctxName)
+	ctx, err := k.contextNode(ctxName)
 	if err != nil {
 		return err
 	}
-
-	var ctxBodyNodeWasEmpty bool // actual namespace value is in contexts[index].context.namespace, but .context might not exist
-	ctxBodyNode := valueOf(ctxNode, "context")
-	if ctxBodyNode == nil {
-		ctxBodyNodeWasEmpty = true
-		ctxBodyNode = &yaml.Node{
-			Kind: yaml.MappingNode,
-		}
-	}
-
-	nsNode := valueOf(ctxBodyNode, "namespace")
-	if nsNode != nil {
-		nsNode.Value = ns
-		return nil
-	}
-
-	keyNode := &yaml.Node{
-		Kind:  yaml.ScalarNode,
-		Value: "namespace",
-		Tag:   "!!str"}
-	valueNode := &yaml.Node{
-		Kind:  yaml.ScalarNode,
-		Value: ns,
-		Tag:   "!!str"}
-	ctxBodyNode.Content = append(ctxBodyNode.Content, keyNode, valueNode)
-	if ctxBodyNodeWasEmpty {
-		ctxNode.Content = append(ctxNode.Content, &yaml.Node{
-			Kind:  yaml.ScalarNode,
-			Value: "context",
-			Tag:   "!!str",
-		}, ctxBodyNode)
+	if err := ctx.PipeE(
+		yaml.LookupCreate(yaml.MappingNode, "context"),
+		yaml.SetField("namespace", yaml.NewStringRNode(ns)),
+	); err != nil {
+		return err
 	}
 	return nil
 }

internal/printer/printer.go

@@ -43,17 +43,17 @@ func init() {
 	}
 }
 
-func Error(w io.Writer, format string, args ...interface{}) error {
-	_, err := fmt.Fprintf(w, ErrorColor.Sprint("error: ")+format+"\n", args...)
+func Error(w io.Writer, format string, args ...any) error {
+	_, err := io.WriteString(w, ErrorColor.Sprint("error: ")+fmt.Sprintf(format, args...)+"\n")
 	return err
 }
 
-func Warning(w io.Writer, format string, args ...interface{}) error {
-	_, err := fmt.Fprintf(w, WarningColor.Sprint("warning: ")+format+"\n", args...)
+func Warning(w io.Writer, format string, args ...any) error {
+	_, err := io.WriteString(w, WarningColor.Sprint("warning: ")+fmt.Sprintf(format, args...)+"\n")
 	return err
 }
 
-func Success(w io.Writer, format string, args ...interface{}) error {
-	_, err := fmt.Fprintf(w, SuccessColor.Sprint("✔ ")+fmt.Sprintf(format+"\n", args...))
+func Success(w io.Writer, format string, args ...any) error {
+	_, err := io.WriteString(w, SuccessColor.Sprint("✔ ")+fmt.Sprintf(format, args...)+"\n")
 	return err
 }

internal/testutil/kubeconfigbuilder.go

@@ -18,7 +18,7 @@ import (
 	"strings"
 	"testing"
 
-	"gopkg.in/yaml.v3"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
 type Context struct {
@@ -31,7 +31,7 @@ type Context struct {
 func Ctx(name string) *Context           { return &Context{Name: name} }
 func (c *Context) Ns(ns string) *Context { c.Context.Namespace = ns; return c }
 
-type Kubeconfig map[string]interface{}
+type Kubeconfig map[string]any
 
 func KC() *Kubeconfig {
 	return &Kubeconfig{
@@ -39,14 +39,16 @@ func KC() *Kubeconfig {
 		"kind":       "Config"}
 }
 
-func (k *Kubeconfig) Set(key string, v interface{}) *Kubeconfig { (*k)[key] = v; return k }
-func (k *Kubeconfig) WithCurrentCtx(s string) *Kubeconfig       { (*k)["current-context"] = s; return k }
-func (k *Kubeconfig) WithCtxs(c ...*Context) *Kubeconfig        { (*k)["contexts"] = c; return k }
+func (k *Kubeconfig) Set(key string, v any) *Kubeconfig   { (*k)[key] = v; return k }
+func (k *Kubeconfig) WithCurrentCtx(s string) *Kubeconfig { (*k)["current-context"] = s; return k }
+func (k *Kubeconfig) WithCtxs(c ...*Context) *Kubeconfig  { (*k)["contexts"] = c; return k }
 
 func (k *Kubeconfig) ToYAML(t *testing.T) string {
 	t.Helper()
 	var v strings.Builder
-	if err := yaml.NewEncoder(&v).Encode(*k); err != nil {
+	enc := yaml.NewEncoder(&v)
+	enc.SetIndent(0)
+	if err := enc.Encode(*k); err != nil {
 		t.Fatalf("failed to encode mock kubeconfig: %v", err)
 	}
 	return v.String()

internal/testutil/tempfile.go

@@ -1,40 +0,0 @@
-// Copyright 2021 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package testutil
-
-import (
-	"io/ioutil"
-	"os"
-	"testing"
-)
-
-func TempFile(t *testing.T, contents string) (path string, cleanup func()) {
-	// TODO consider removing, used only in one place.
-	t.Helper()
-
-	f, err := ioutil.TempFile(os.TempDir(), "test-file")
-	if err != nil {
-		t.Fatalf("failed to create test file: %v", err)
-	}
-	path = f.Name()
-	if _, err := f.Write([]byte(contents)); err != nil {
-		t.Fatalf("failed to write to test file: %v", err)
-	}
-
-	return path, func() {
-		f.Close()
-		os.Remove(path)
-	}
-}

kubectx

@@ -33,6 +33,8 @@ usage() {
   fi
 
   cat <<EOF
+Manage and switch between kubectl contexts.
+
 USAGE:
   $SELF                       : list the contexts
   $SELF <NAME>                : switch to context <NAME>
@@ -46,6 +48,8 @@ USAGE:
   $SELF -u, --unset           : unset the current context
 
   $SELF -h,--help             : show this message
+
+  (This executable is the legacy bash-based implementation, consider upgrading to Go-based implementation.)
 EOF
 }
 
@@ -227,7 +231,7 @@ main() {
       # we don't call current_context here for two reasons:
       # - it does not fail when current-context property is not set
       # - it does not return a trailing newline
-      kubectl config current-context
+      $KUBECTL config current-context
     elif [[ "${1}" == '-u' || "${1}" == '--unset' ]]; then
       unset_context
     elif [[ "${1}" == '-h' || "${1}" == '--help' ]]; then

kubens

@@ -33,12 +33,16 @@ usage() {
   fi
 
   cat <<EOF
+Switch between Kubernetes namespaces.
+
 USAGE:
   $SELF                    : list the namespaces in the current context
   $SELF <NAME>             : change the active namespace of current context
   $SELF -                  : switch to the previous namespace in this context
   $SELF -c, --current      : show the current namespace
   $SELF -h,--help          : show this message
+
+  (This executable is the legacy bash-based implementation, consider upgrading to Go-based implementation.)
 EOF
 }
 

test/common.bash

@@ -2,13 +2,15 @@
 
 # bats setup function
 setup() {
-  export XDG_CACHE_HOME="$(mktemp -d)"
-  export KUBECONFIG="${XDG_CACHE_HOME}/config"
+  TEMP_HOME="$(mktemp -d)"
+  export TEMP_HOME
+  export HOME=$TEMP_HOME
+  export KUBECONFIG="${TEMP_HOME}/config"
 }
 
 # bats teardown function
 teardown() {
-  rm -rf "$XDG_CACHE_HOME"
+  rm -rf "$TEMP_HOME"
 }
 
 use_config() {