New feature: Kubernetes Tools (#13)

.github/workflows/ci.yaml

@@ -32,6 +32,7 @@ jobs:
           - aws-ssm-session-manager-plugin
           - openapi-generator-cli
           - opentofu
+          - kubernetes-tools
         baseImage:
           - debian:latest
     steps:
@@ -52,6 +53,7 @@ jobs:
           - aws-ssm-session-manager-plugin
           - openapi-generator-cli
           - opentofu
+          - kubernetes-tools
     steps:
       - uses: actions/checkout@v4
 

src/kubernetes-tools/devcontainer-feature.json

@@ -0,0 +1,48 @@
+{
+  "name": "Kubernetes Tools",
+  "id": "kubernetes-tools",
+  "version": "0.1.0",
+  "description": "A feature to install K8s tools.",
+  "options": {
+    "kubectl-version": {
+      "type": "string",
+      "default": "latest",
+      "description": "The version of kubectl to install, in format of 'v*'."
+    },
+    "install-krew": {
+      "type": "string",
+      "proposals": [
+        "latest",
+        "none"
+      ],
+      "default": "none",
+      "description": "Whether to install Krew. Use 'latest' to install the latest version. Use 'none' to skip installation."
+    },
+    "install-k9s": {
+      "type": "string",
+      "proposals": [
+        "latest",
+        "none"
+      ],
+      "default": "none",
+      "description": "Whether to install k9s. Use 'latest' to install the latest version. Use 'none' to skip installation."
+    },
+    "install-helm": {
+      "type": "string",
+      "proposals": [
+        "latest",
+        "none"
+      ],
+      "default": "none",
+      "description": "Whether to install Helm. Use 'latest' to install the latest version. Use 'none' to skip installation."
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-kubernetes-tools.vscode-kubernetes-tools",
+        "Tim-Koehler.helm-intellisense"
+      ]
+    }
+  }
+}

src/kubernetes-tools/install.sh

@@ -0,0 +1,72 @@
+#!/bin/sh
+
+set -e
+
+ARCH=$(dpkg --print-architecture)
+
+if ! command -v curl || ! command -v git; then
+  echo "Installing curl, and git"
+  apt-get update && apt-get install -y curl git
+fi
+
+# kubectl
+# ----------------------------------------------------------------------------
+echo "Installing kubectl"
+
+if [ "$KUBECTL_VERSION" = "latest" ]; then
+  KUBECTL_VERSION="$(curl -L -s https://dl.k8s.io/release/stable.txt)"
+fi
+
+curl -L --output /usr/bin/kubectl "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/${ARCH}/kubectl" &&
+  chmod +x /usr/bin/kubectl
+
+# Krew
+# ----------------------------------------------------------------------------
+if [ "$INSTALL_KREW" != "none" ]; then
+  if [ "$INSTALL_KREW" = "latest" ]; then
+    krew_dl_url="$(
+      curl -s https://api.github.com/repos/kubernetes-sigs/krew/releases/latest |
+        grep -Eo -m 1 "https://.+krew-linux_${ARCH}\.tar\.gz"
+    )"
+  else
+    krew_dl_url="https://github.com/kubernetes-sigs/krew/releases/download/${INSTALL_KREW}/krew-linux_${ARCH}.tar.gz"
+  fi
+
+  echo "Installing Krew from $krew_dl_url"
+  (
+    set -x
+    cd "$(mktemp -d)" &&
+      KREW="krew-linux_${ARCH}" &&
+      curl -fsSLO "$krew_dl_url" &&
+      tar zxvf "${KREW}.tar.gz" &&
+      mv ./"${KREW}" /usr/local/bin/krew
+  )
+fi
+
+# K9s
+# ----------------------------------------------------------------------------
+if [ "$INSTALL_K9S" != "none" ]; then
+  if [ "$INSTALL_K9S" = "latest" ]; then
+    k9s_dl_url="$(
+      curl -s https://api.github.com/repos/derailed/k9s/releases/latest |
+        grep -Eo -m 1 "https://.+k9s_linux_${ARCH}\.deb"
+    )"
+  else
+    k9s_dl_url="https://github.com/derailed/k9s/releases/download/${INSTALL_K9S}/k9s_linux_${ARCH}.deb"
+  fi
+
+  echo "Downloading K9s from $k9s_dl_url"
+  curl -L --output /tmp/k9s.deb "$k9s_dl_url" &&
+    dpkg --install /tmp/k9s.deb &&
+    rm -f /tmp/k9s.deb
+fi
+
+# Helm
+# ----------------------------------------------------------------------------
+if [ "$INSTALL_HELM" != "none" ]; then
+  helm_version=$([ "$INSTALL_HELM" = "latest" ] && echo '' || echo "$INSTALL_HELM")
+
+  echo "Installing Helm $helm_version"
+  curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 |
+    DESIRED_VERSION="$helm_version" bash
+fi

test/kubernetes-tools/full.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+# shellcheck source=/dev/null
+source dev-container-features-test-lib
+
+check "verify kubectl installation" kubectl version --client | grep -E 'Client Version: v.+'
+check "verify Krew installation" krew version | grep -E 'GitTag\s+v.+'
+check "verify k9s installation" k9s version --short | grep -E 'Version\s+v.+'
+check "verify Helm installation" helm version --short | grep -E 'v.+'
+
+reportResults

test/kubernetes-tools/scenarios.json

@@ -0,0 +1,24 @@
+{
+  "full": {
+    "image": "mcr.microsoft.com/devcontainers/base:bookworm",
+    "features": {
+      "kubernetes-tools": {
+        "kubectl-version": "latest",
+        "install-krew": "latest",
+        "install-k9s": "latest",
+        "install-helm": "latest"
+      }
+    }
+  },
+  "specific-version": {
+    "image": "mcr.microsoft.com/devcontainers/base:bookworm",
+    "features": {
+      "kubernetes-tools": {
+        "kubectl-version": "v1.31.1",
+        "install-krew": "v0.4.3",
+        "install-k9s": "v0.32.4",
+        "install-helm": "v3.16.2"
+      }
+    }
+  }
+}

test/kubernetes-tools/specific-version.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+# shellcheck source=/dev/null
+source dev-container-features-test-lib
+
+check "verify kubectl installation" kubectl version --client | grep 'Client Version: v1.31.1'
+check "verify Krew installation" krew version | grep -E 'GitTag\s+v0\.4\.3'
+check "verify k9s installation" k9s version --short | grep -E 'Version\s+v0\.32\.4'
+check "verify Helm installation" helm version --short | grep 'v3.16.2'
+
+reportResults

test/kubernetes-tools/test.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+
+# shellcheck source=/dev/null
+source dev-container-features-test-lib
+
+check "verify kubectl installation" kubectl version --client | grep -E 'Client Version: v.+'
+check "do not install Krew" command krew 2>&1 | grep 'krew: command not found'
+check "do not install k9s" command k9s 2>&1 | grep 'k9s: command not found'
+check "do not install Helm" command helm 2>&1 | grep 'helm: command not found'
+
+reportResults