lxcafe/post_installation_script_test

Post-Installation Script Testing

This directory contains everything needed to test the post-installation script in a safe, isolated container environment.

Contents

• Dockerfile - Container image definition for testing
• 01_create_image.sh - script for creating container image locally
• 02_start_container_with_image.sh - script for starting container from created image

Purpose

Provides a reproducible testing environment that allows:

• Running the post-installation script without affecting the host system
• Simulating apt installations (safe, no real package changes)
• Testing script logic, prompts, and error handling
• Validating syntax and tracing execution

Features

The Dockerfile includes:

• Ubuntu 22.04 base image
• Simulated sudo wrapper that runs apt-get -s install (simulates installs without making changes)
• Useful utilities: bash, wget, tar, curl, gnupg, ca-certificates, file, procps

Usage

Build the test image

Run the prepared shell script to build the image

cd post_installation_script_test
sh 01_create_image.sh

Start a container for testing

Run the prepared shell script start a new container for testing based in the image and remove container after it is stopped. After container is started an interactive session is started into the container.

cd post_installation_script_test
sh 02_start_container_with_image.sh

Test the script file in the running container

After container is started an interactive session was started in the container and the script can be started for testing

sh script.sh

Security Notes

• The script is mounted read-only (:ro flag) to prevent container from modifying host files
• Container runs with reduced privileges (--cap-drop ALL --security-opt no-new-privileges)
• The sudo wrapper simulates apt operations, so no packages are actually installed
• Use --tmpfs /tmp:rw for any temporary writes inside the container