GitHub Copilot Instructions — bootc-installer#

This is projectbluefin/bootc-installer: a multi-variant Flatpak GUI installer for bootc images, backed by the fisherman Go backend.

Read before doing any work#

Full agent guide: AGENTS.md
Testing pitfalls: cat ~/src/skills/bootc-installer/PITFALLS.md

Key facts#

Repo: projectbluefin/bootc-installer — work directly here, no fork
fisherman: git submodule at fisherman/ → projectbluefin/fisherman. Push changes there separately, then update the pointer here
Branch strategy: feature/xyz → dev → prod. All PRs target dev
CI gate: --cov-fail-under=47 for Python unit tests; Go coverage gate: 20%
Linting: python3 -m ruff check bootc_installer/ tests/ — run before every commit
Tests: pytest tests/unit/ -q (unit), xvfb-run -a pytest tests/ui/ -q (UI)

Three variants, one codebase#

Variant	Entry point	Flatpak ID
GNOME (default)	`main.py`	`org.bootcinstaller.Installer`
XFCE	`main.py`	`org.xfceinstaller.Installer`
KDE	`main_qt.py`	`org.kdeinstaller.Installer`

When adding .py files, also add them to sources = [...] in the subpackage's meson.build or the Flatpak install will fail (test_meson_sources.py catches this).

Python module map#

bootc_installer/
├── core/ disks, system, keymaps, locales
├── defaults/ wizard steps (disk, encryption, user, image, slurp…)
├── views/ progress, done, confirm, recovery_key, tour, confirm_data
├── widgets/ page_header
├── windows/ main_window, dialogs, hardware warning windows
├── layouts/ yes_no, preferences
├── utils/ processor, recipe, finals, builder, codec_check,
│ progress_parser, phone_companion, pastry_compat, run_async
├── gtk/ Blueprint .blp files (GNOME/XFCE)
├── kde/ QML + Python (KDE)
├── main.py GTK4 entry point
└── main_qt.py Qt/Kirigami entry point

Dev loop#

./run-dev.sh # rebuild if sources changed, launch with BOOTC_DEMO=1
./run-dev.sh --rebuild # force full rebuild
./run-dev.sh --logs # tail debug log only

BOOTC_DEMO=1 intercepts at on_installation_confirmed() — no fisherman, no disk.

CI workflows#

Workflow	Trigger	What it does
`python-test.yml`	every push/PR	Unit tests (cov 47%) + UI tests (Xvfb)
`go-test.yml`	every push/PR	fisherman `go vet` + tests + race detector
`flatpak.yml`	dev/prod/tags	GNOME Flatpak build + publish
`build-flatpaks.yml`	dev/prod/tags	All 3 variants (GNOME + XFCE + KDE)
`validate-flatpak.yml`	manifest changes	JSON lint + appstream check
`nightly.yml`	06:00 UTC daily	fisherman tests on both branches + race detector

Critical constraints#

Always 3-partition GPT (EFI + ext4 /boot + root) — GRUB can't read modern XFS
Scratch at /var/fisherman-tmp — never /run/* (tmpfs, too small)
Flatpak manifests: use "type": "archive" with SHA256, never "type": "git" (sandbox rejects bare git repos)
GTK unit tests: use Cls.__new__(Cls) + attribute injection with _build_gi_stubs() — never instantiate GTK widgets without a display
New .py files must be in meson.build sources = [...] or the Flatpak build breaks