apt-get packages feature

src/apt-get-packages/devcontainer-feature.json

@@ -0,0 +1,19 @@
+{
+    "name": "apt-get packages",
+    "id": "apt-get-packages",
+    "version": "1.0.0",
+    "description": "Installs an apt-get packages (debian).",
+    "documentationURL": "http://github.com/devcontainers-contrib/features/tree/main/src/apt-get-package",
+    "installAfter": [],
+    "options": {
+        "packages": {
+            "type": "string",
+            "proposals": [
+                "gcc",
+                "curl"
+            ],
+            "default": "",
+            "description": "Space delimitered apt-get packages to install."
+        }
+    }
+}

src/apt-get-packages/install.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -ex
+
+PACKAGES="${PACKAGES:-""}"
+
+# Clean up
+rm -rf /var/lib/apt/lists/*
+
+if [ -z "$PACKAGES" ]; then
+	echo -e "'packages' variable is empty, skipping"
+	exit 0
+fi
+
+if [ "$(id -u)" -ne 0 ]; then
+	echo -e 'Script must be run as 
+    root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+	exit 1
+fi
+
+check_packages() {
+	# This is part of devcontainers-contrib script library
+	# source: https://github.com/devcontainers-contrib/features/tree/v1.1.8/script-library
+	if ! dpkg -s "$@" >/dev/null 2>&1; then
+		if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+			echo "Running apt-get update..."
+			apt-get update -y
+		fi
+		apt-get -y install --no-install-recommends "$@"
+	fi
+}
+
+packages_array=("$PACKAGES")
+check_packages ${packages_array[@]}

test/apt-get-packages/install_cowsay_build_essential.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+
+source dev-container-features-test-lib
+
+check 'dpkg -l | grep "ii  cowsay"' dpkg -l | grep "ii  cowsay"
+check 'dpkg -l | grep "ii  build-essential"' dpkg -l | grep "ii  build-essential"
+
+
+reportResults

test/apt-get-packages/scenarios.json

@@ -0,0 +1,11 @@
+{
+    "install_cowsay_build_essential": {
+        "image": "debian:bullseye",
+        "features": {
+            "apt-get-packages": {
+                "version": "latest",
+                "packages": "cowsay build-essential"
+            }
+        }
+    }
+}

test/apt-get-packages/test.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+source dev-container-features-test-lib
+
+check "nothing is installted when package is empty" exit 0
+
+reportResults