# ISO Build Rules

## Verify package names before use

ISO builds take 30–60 minutes. A wrong package name wastes an entire build cycle.

**Rule: before adding any Debian package name to the ISO config, verify it exists and check its file list.**

Use one of:
- `https://packages.debian.org/bookworm/<package-name>` — existence + description
- `https://packages.debian.org/bookworm/amd64/<package-name>/filelist` — exact files installed
- `apt-cache show <package>` inside a Debian bookworm container

This applies to:
- `iso/builder/config/package-lists/*.list.chroot`
- Any package referenced in bootloader configs, hooks, or overlay scripts

## Memtest rule

Prefer live-build's built-in memtest integration over custom hooks or hardcoded
bootloader paths. If you ever need to reference memtest files manually, verify
the exact package file list first for the target Debian release.