Dev container feature - allow installing extensions

ext/devcontainer/Makefile

@@ -0,0 +1,12 @@
+.PHONY: test
+
+help: ## show this help
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) \
+	| awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%s\033[0m|%s\n", $$1, $$2}' \
+	| column -t -s '|'
+
+install-devcontainer-cli:
+	@if ! [ -x "$$(command -v devcontainer)" ]; then echo "Installing devcontainer CLI"; npm install -g @devcontainers/cli; else echo "devcontainer CLI is already installed"; fi
+
+test: install-devcontainer-cli ## run tests
+	devcontainer features test --base-image mcr.microsoft.com/devcontainers/base:ubuntu

ext/devcontainer/src/azd/README.md

@@ -27,6 +27,7 @@ Select a specific `azd` version [here](https://github.com/Azure/azure-dev/releas
 | Options Id | Description | Type | Default Value |
 |-----|-----|-----|-----|
 | version | Select or enter an Azure Developer CLI version. (Available versions may vary by Linux distribution.) | string | stable |
+| extensions | Comma-separated list of Azure Developer CLI extensions to install. | string | (empty) |
 
 ## Customizations
 

ext/devcontainer/src/azd/devcontainer-feature.json

@@ -1,25 +1,30 @@
 {
-    "id": "azd",
-    "version": "0.1.0",
-    "name": "Azure Developer CLI",
-    "documentationURL": "https://github.com/azure/azure-dev/tree/main/ext/devcontainer/src/azd",
-    "description": "Installs the Azure Developer CLI along with needed dependencies.",
-    "options": {
-      "version": {
-        "type": "string",
-        "proposals": [
-          "stable"
-        ],
-        "default": "stable",
-        "description": "Select or enter an Azure Developer CLI version. (Available versions may vary by Linux distribution.)"
-      }
+  "id": "azd",
+  "version": "0.2.0",
+  "name": "Azure Developer CLI",
+  "documentationURL": "https://github.com/azure/azure-dev/tree/main/ext/devcontainer/src/azd",
+  "description": "Installs the Azure Developer CLI along with needed dependencies.",
+  "options": {
+    "version": {
+      "type": "string",
+      "proposals": [
+        "stable"
+      ],
+      "default": "stable",
+      "description": "Select or enter an Azure Developer CLI version. (Available versions may vary by Linux distribution.)"
     },
-    "customizations": {
-        "vscode": {
-            "extensions": [
-              "ms-azuretools.vscode-bicep",
-              "ms-vscode.vscode-node-azure-pack"
-            ]
-        }
+    "extensions": {
+      "type": "string",
+      "default": "",
+      "description": "Optional comma separated list of Azure Developer CLI extensions to install."
     }
-  }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-azuretools.vscode-bicep",
+        "ms-vscode.vscode-node-azure-pack"
+      ]
+    }
+  }
+}

ext/devcontainer/src/azd/install.sh

@@ -5,6 +5,7 @@
 #-------------------------------------------------------------------------------------------------------------
 
 AZD_VERSION=${VERSION:-"stable"}
+AZD_EXTENSIONS=${EXTENSIONS}
 
 check_packages() {
     if ! dpkg -s "$@" > /dev/null 2>&1; then
@@ -24,3 +25,15 @@ check_packages $(apt-cache search '^libicu[0-9]+$' | cut -d' ' -f1)
 echo "(*) Installing Azure Developer CLI"
 
 curl -fsSL https://aka.ms/install-azd.sh | bash -s -- --version $AZD_VERSION -a $(dpkg --print-architecture)
+
+
+# If Azure Developer CLI extensions are requested, loop through and install 
+if [ -n "${AZD_EXTENSIONS}" ]; then
+    echo "Installing Azure Developer CLI extensions: ${AZD_EXTENSIONS}"
+    extensions=(`echo "${AZD_EXTENSIONS}" | tr ',' ' '`)
+    for i in "${extensions[@]}"
+    do
+        echo "Installing ${i}"
+        su "${_REMOTE_USER}" -c "azd extension install ${i}" || continue
+    done
+fi

ext/devcontainer/test/azd/scenarios.json

@@ -0,0 +1,10 @@
+{
+	"with_extensions": {
+		"image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+		"features": {
+			"azd": {
+				"extensions": "azure.coding-agent"
+			}
+		}
+	}
+}

ext/devcontainer/test/azd/with_extensions.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "version" azd version
+
+azd extension list --installed 
+
+matching_extension_count=$(azd extension list --installed | grep "^azure.coding-agent" | wc -l)
+check "check extensions" bash -c "test \"$matching_extension_count\" -eq 1"
+
+# Report result
+reportResults