# 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

```bash
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.

```bash
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

```bash
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