open_and_save

Overview

open_and_save is a functional testing tool designed to validate the integrity of the ISO writing process. It opens an existing Ubuntu ISO image, parses its structure, and then saves it back to a new ISO file. The goal of this test is to ensure that the generated ISO is bit-for-bit identical to the original, verifying that the library's write operations correctly preserve all ISO9660 structures, including Rock Ridge, Joliet, and El Torito extensions.

Purpose

While open_and_save also exercises the ISO parsing logic, its primary focus is to test the writing (save) functionality. It is meant to be executed after testing the parsing and extraction logic, ensuring that an ISO can be loaded and saved without modification.

Features

• Reads an existing Ubuntu ISO image
• Saves it to a new ISO file
• Verifies that the output ISO matches the original (MD5 checksum comparison)
• Supports ISO9660 extensions including:
  • Rock Ridge (POSIX-style metadata)
  • Joliet (Windows long filenames)
  • El Torito (Bootable images)

Usage

open_and_save <input.iso> <output.iso>

Example

open_and_save ubuntu-22.04.iso