# Live ISO build

Builds a bootable Arch-based live ISO that auto-starts the Flask webinstaller from `../webinstaller/` on boot. User plugs in a USB, boots, and the installer wizard comes up on `http://<vm-ip>:5000`.

Directly runnable; CI integration comes later once the build is stable.

## Run a build

Needs a host with Docker. Disk space required: ~15 GB scratch during the build, ~1.5 GB for the final ISO.

```bash
./iso/build.sh
```

Output ISO ends up in `iso/out/furtka-<date>-x86_64.iso`. Around 3–10 min on a 4-core VM. First run is slower because it pulls `archlinux:latest` and all packages from upstream.

The script re-execs itself inside a privileged `archlinux:latest` container. That's so `mkarchiso` has root + loop-mount access without polluting the host — Ubuntu hosts don't ship archiso natively anyway.

## What gets baked in

The build starts from Arch's stock `releng` profile (the same one used to build the official Arch ISO), then overlays our customizations from `overlay/`:

| Overlay file                              | Effect                                                                           |
|-------------------------------------------|----------------------------------------------------------------------------------|
| `overlay/packages.extra`                  | Appended to the package list. Adds `python`, `python-flask`, `avahi`, `nss-mdns` |
| `overlay/profiledef.sh`                   | Appended to `profiledef.sh`. Renames the ISO to `furtka-*` with a dated version  |
| `overlay/airootfs/opt/furtka/`            | Directory where `webinstaller/` is copied at build time                          |
| `overlay/airootfs/etc/systemd/system/`    | Contains `furtka-webinstaller.service` + a symlink into `multi-user.target.wants/` so it auto-starts on boot |

The systemd service runs `flask --app app run --host 0.0.0.0 --port 5000` under `/opt/furtka`. The `0.0.0.0` binding is important — the Flask default is localhost-only, which wouldn't be reachable from another machine on the LAN.

mDNS (`proksi.local`) via avahi is installed but not yet wired. First milestone is just "boot → browser → wizard at raw IP". Naming comes next.

## Test flow

1. Build: `./iso/build.sh`
2. Copy the ISO to your Proxmox host's ISO storage (typically `/var/lib/vz/template/iso/`)
3. Create a VM with:
   - 2 vCPU, 4 GB RAM, 20 GB disk (empty)
   - CD-ROM attached with the Furtka ISO
   - Boot order: CD before disk
   - Network: same bridge as your LAN, DHCP
4. Start the VM. Wait ~30 s for boot.
5. Find its IP in Proxmox's VM summary (or your router's DHCP table)
6. Open `http://<vm-ip>:5000` — the existing 3-screen wizard should be there

## Known rough edges

- **Disk space**: the first time you build on a fresh host, the squashfs/xorriso steps need ~15 GB free. If the host's LVM-root is smaller, `xorriso` silently dies at the very end with "Image size exceeds free space on media".
- **Flask `/` route** returns "Hello World" instead of redirecting to `/install/step1`. Harmless but surprising; will be cleaned up when we wire up screens 4–8.
- **No HTTPS yet**. The Furtka plan is "local CA + green padlock on `https://proksi.local`" — that's a later milestone. For now, plain HTTP.
- **archinstall is not invoked**. The wizard collects input but doesn't write to disk yet. Still a walking skeleton, not an installer.