furtka/iso

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.

./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/). Browser uploads of 1.5 GB truncate silently — prefer scp over the Proxmox WebUI.
3. Create a VM with:
   • 2 vCPU, 4 GB RAM, 20 GB disk (empty)
   • BIOS: OVMF (UEFI), add EFI Disk on local-lvm. SeaBIOS fails to load ldlinux.c32 from our ISO; only the UEFI path works reliably.
   • Secure Boot disabled. Our GRUB isn't signed, so Secure Boot rejects it with Access Denied. Either boot into OVMF setup (Esc during boot) → Device Manager → Secure Boot Configuration → Attempt Secure Boot [ ] → F10 → reboot. Or remove the EFI Disk and re-add it with "Pre-Enroll keys" unchecked.
   • 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.
• Drive list includes /dev/loop0 and /dev/sr0. /dev/loop0 is the live ISO's own squashfs mounted in RAM; /dev/sr0 is the CD-ROM itself. Both appear as install targets, which is wrong. Filter lives in webinstaller/drives.py and hasn't been added yet.
• GRUB menu still says "Arch Linux install medium". We inherit releng's bootloader config. Cosmetic, fix when we care about end-user polish.