images-compare: initial commit

[CvH]

LibreELEC Image Comparison Tool

This PR introduces an image comparison tool under scripts/image-compare designed to compare two LibreELEC images (.img, .img.gz or .tar) by extracting and comparing their internal SquashFS (SYSTEM) contents.

Installation

Before running the script, ensure the required system and Python dependencies are installed:

Ubuntu 26.04

# Install system packages
sudo apt install -y 7zip squashfs-tools file

# Install python requirements
sudo apt install python3-prettytable python3-pil

Usage & Examples

Run images_compare.py by passing two target image files:

python3 scripts/image-compare/images_compare.py \
  image1.img.gz \
  image2.img.gz \
  --min-summary-change 1024

Example Output:

Kernel Files Changed
--------------------
+---------------------------------------------------+-------------+
| File                                              | Size Change |
+---------------------------------------------------+-------------+
| usr/lib/firmware/rtl_bt/rtl8852au_fw.bin          |    -3.7 KiB |
+---------------------------------------------------+-------------+

Summary
-------
Overall size difference: +889.1 KiB
+------+--------------------------------------------+------------+
| Rank | File                                       |   Increase |
+------+--------------------------------------------+------------+
|  1   | usr/lib/systemd/libsystemd-shared-261.so   | +321.1 KiB |
|  2   | usr/lib/systemd/libsystemd-core-261.so     | +128.2 KiB |
+------+--------------------------------------------+------------+

For more details, see the complete README.md.