744f18cd90
Live-ISO bos-rescue finds the installed btrfs @ and ESP, then offers arch-chroot and/or the same GRUB NVRAM + --removable sequence as post-install.sh. Recovery is grub-btrfs or this reinstall — GRUB pins rootflags=subvol=@. bos-first-boot runs once after the first graphical login: NVIDIA offer file + notify (no driver install), VM-without-GL notify, HiDPI hint file (never rewrites monitors.json). Re-enable the Calamares packages module as a refresh-only step with skip_if_no_internet and ignore_update_db_error so offline installs cannot abort on pacman -Sy.
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Hardware and recovery
GPUs
BOS ships the generic Mesa stack. AMD and Intel work out of the box.
NVIDIA is unsupported. The proprietary driver is not included, NVIDIA
firmware is not on the image, and there is no Hyprland NVIDIA env wiring.
Installing nvidia / nvidia-utils after the fact is not a product path.
On first graphical login, bos-first-boot probes lspci / /proc and,
if an NVIDIA GPU is present, writes ~/.local/state/bos/nvidia-offer.json
and notifies that the proprietary driver is not on the ISO. It does not
install anything. bos-settings can grow a panel that reads that file later.
The same probe leaves a HiDPI hint at ~/.local/state/bos/hidpi-hint.json
when scale > 1 or the panel is dense; it never rewrites monitors.json.
A VM without /dev/dri gets a notification only.
Recovery
An update that breaks the system is recovered from the GRUB "snapshots"
submenu (grub-btrfs), not snapper rollback.
BOS GRUB pins rootflags=subvol=@. snapper rollback swaps the default
subvolume; the installed grub.cfg will still boot @. Pick the grub-btrfs
entry so the kernel command line matches the snapshot you want.
If the system will not boot (lost EFI entry / broken GRUB), boot the live
ISO and run sudo bos-rescue. It mounts @ + the ESP and offers the same
grub-install NVRAM + --removable sequence as post-install.sh.
A/B root swapping is not implemented. See the README Recovery section.