Builds a full dev workstation from a bare Arch Linux install. https://git.cjennings.net/archsetup/atom?h=main 2026-06-28T05:43:24+00:00 2026-06-28T05:43:24+00:00 Craig Jennings c@cjennings.net 2026-06-28T05:43:24+00:00 urn:sha1:7630a385a57263b7ac5ea0d130542c7400788f8a A pacman -Syu that swaps mesa/hyprland/wayland runtime libs out from under a running Hyprland session crashes the compositor: the next GPU-lib call hits a now-"(deleted)" library and SIGABRTs, taking the Wayland clients with it (hit ratio 2026-06-07, mesa + hyprland upgraded live). It's a likely driver of ratio's high unsafe-shutdown ratio. I added a pacman PreTransaction hook (hypr-live-update-guard) on the GPU/compositor runtime set. When such an upgrade is pending and Hyprland is running, it aborts before any package is swapped and tells the user to re-run from a TTY with the session stopped. Aborting at PreTransaction is safe: nothing is replaced yet, so the live session is untouched. With no Hyprland running (the from-a-TTY path) the guard stays quiet and the upgrade proceeds. Override with HYPR_ALLOW_LIVE_UPDATE=1 or by touching the sentinel file named in the abort message. archsetup installs the guard and hook in the hyprland path. The decision logic is covered by tests/hypr-live-update-guard (running/not, override, multi-package, empty-target). The hook firing against a real pacman transaction needs a live Hyprland session, filed as a manual test.