🐧🏭 linux-factory

a framework used to create custom linux debian operating systems

Usage

Building

Edit configurations in the os/config.yaml, activate custom overlays and when ready . . .

make build

Once the build has completed, you can find the iso installer located in the .build/lb folder.

Reset Environment

Run the following command to completely reset your environment.

sudo git clean -fxd

Please note that if you stopped the build in the middle of execution (for example CTRL-C), it's possible you will get a permission error. If this happens you may need to restart your computer and try resetting after you have rebooted.

Dependencies

This system can only be built from a Debian based operating system. While any Debian based operating system should work, this is only tested against the official Debian distribution on amd64.

You can install all of the dependencies with the following command.

sudo apt-get install -y imagemagick make git git-lfs grub-emu live-build python3 jq python3-poetry-core python3-venv snapd && sudo snap install yq

Required

Optional

Overlays

Overlays are configurable, flexible and decoupled customizations that get applied to the operating system build. They can be mixed and matched with other overlays, or be completely disabled if you don't want those changes.

Overlays get "overlayed" on top of the os directory during the build. This means the file structure inside of an overlay and the file structure of the os directory are identical.

Example

The example overlay showcases the capabilities of an overlay. You can use it as a starting point for one of your overlays, or simply use it as a reference.

overlays/example

Debian Installer

The Debian Installer is the official installation system for the Debian operating system. It provides a user-friendly interface for installing Debian on a wide range of hardware, from desktops and laptops to servers and embedded systems. The Debian Installer supports multiple languages, network installations, and a variety of disk partitioning options. With its flexible and customizable design, the Debian Installer is a popular choice for many users who are looking to install Debian on their systems.

overlays/debianInstaller

Grub

GRUB (GRand Unified Bootloader) is a boot loader package from the GNU Project. It is used to boot Linux operating systems, as well as a number of other operating systems. In the context of this system, Grub can be used as an overlay to customize the boot loader.

overlays/debianInstaller

Sway

Sway is a tiling window manager for Wayland. It provides a tiling window manager experience for users who are looking for a modern, keyboard-driven interface. In the context of this system, Sway can be used as an overlay to provide a tiling window manager for the target system.

overlays/sway

Overlay Components

Fonts

Supports zip, tar and tar.gz files that contain .ttf or .otf fonts

Packages

Repos

Filesystem

Prompt

Types

• string
• boolean
• select
• multiselect
• error
• note
• password

Hooks

To use the hooks in your overlay, you will need to create a file named overlay.py within your overlay directory. This file should contain a class named OverlayHooks that implements methods for each hook.

Each hook has two corresponding methods, one for before the stage is executed and one for after the stage is executed. There are currently three stages in the process: build, config, and prepare. This means the following hooks are available for you to use:

• before_build()
• after_build()
• before_config()
• after_config()
• before_prepare()
• after_prepare()

For example, if you wanted to run some custom code before the build stage is executed, you could implement the following in your overlay.py file:

overlay.py

class OverlayHooks:
    def before_build(self):
        # Your custom code here

It's important to note that the order in which hooks are executed is determined by the order in which the overlays are specified. Make sure to take this into consideration when implementing your hooks.

Script Hooks

Script hooks are a linux-factory concept and should not be confused with the live build hooks available at lb/hooks/.

During the installation process, there are two script hooks that can be utilized, post-install and user-post-install.

Location of Script Hooks

Script hooks should be placed in the hooks/<hook> folder. All scripts within the specified folder will be executed during the corresponding hook.

the name of the script should be the same name as your overlay to prevent collisions with hooks from other overlays

Execution of Script Hooks

• user-post-install: This script hook will execute after the system has been installed as the newly created user.
• post-install: This script hook will also execute after the system has been installed, but it runs as the root user.

Example

Here's an example of how you can utilize the user-post-install script hook.

Create a folder named user-post-install in the hooks directory and add a file named script.sh in it. In the script.sh file, you can add the following code.

hooks/user-post-install/<overlay>.sh

#!/bin/sh

echo "Running user-post-install script"

Live Build Cheatsheet

Definitions

• live medium - the ISO image and filesystem
• live system - the operating system booted from the live medium
• installed system - the operating system installed from debian installer
• chroot stage - stage when building the image
• binary stage - stage when building the live medium (binary can also refer to the debian installer)

File Structure

• config/archives/*.{list,key}.binary - repositories added to live system /etc/apt/sources.list.d/
• config/archives/*.{list,key}.chroot - repositories loaded during the chroot stage
• config/includes.binary/* - files to include in the live medium's filesystem
• config/includes.chroot/* - files to include in the live system's filesystem
• config/includes.installer/* - configuration for debian installer
• config/package-lists/*.list.binary - packages to place in the APT pool/ repository on the live medium (for offline packages)
• config/package-lists/*.list.chroot_install - packages to install in the live system and installed system
• config/package-lists/*.list.chroot_live - packages to install in the live system only (works by uninstalling them from installed system)
• config/package-lists/*.list.chroot - packages to install in the live system (which will most likely be added to the installed system)
• config/packages.binary - udeb packages to install for the debian installer
• config/packages.chroot - deb packages to install for the live system

I'm not sure exactly what the differences between config/package-lists/*.list.chroot and config/package-lists/*.list.chroot_install are.

WARNING: binary unfortunately has many different meanings in the documentation depending on the context. The following table helps clarify the context of binary.

WARNING: config/archives/*.{list,key}.chroot does not make the repositories available to the live system. Instead you must use config/archives/*.{list,key}.binary for the repositories to be available to the live system.

Mounts

• live medium - /cdrom if debian installer or /run/live/medium from live system
• installed system - /target if debian installer or /tmp/calamares-root-* if calamares

Resources

• https://bugs.launchpad.net/subiquity/+bug/1960068
• https://debian-live-config.readthedocs.io/en/latest/custom.html
• https://discourse.ubuntu.com/t/automated-server-install-reference/16613/21
• https://github.com/elementary/os/wiki/Building-ISO-Images
• https://groups.google.com/g/linux.debian.user/c/yN-MAMle-qE?pli=1
• https://help.ubuntu.com/community/InstallCDCustomization
• https://live-team.pages.debian.net/live-manual/html/live-manual/index.en.html
• https://manpages.debian.org/unstable/live-build/lb_config.1.en.html
• https://wiki.debian.org/DebianInstaller/NetbootFirmware
• https://www.debian.org/releases/stable/i386/ch06s04.en.html