Consolidates 8 closures to only 4 by using a git branch selector that sets
the values for -dev variants of each closure.
Reference the 'Verifying KioskConfig builds are in the right branch' note
in Obsidian for more reference.
All variants now follow the same update procedure as the dev flakes;
prod variants pull the RadiantWave binary, Attic repo, and manifest
from the radiantwave channel instead of radiantwave-dev.
RemainAfterExit=true kept the oneshot 'active' forever, which broke the
timer's OnUnitActiveSec re-arming: the timer fired once (NEXT emptied,
Trigger n/a) and never polled again. Remove it so the service returns to
dead and the 2-min cadence keeps firing.
nix-store -r was fetching the closure without --add-root, so the swapped-in
app pointer wasn't a GC root and the running closure could be collected.
Pin it with --add-root .current-root, and root the already-current closure
on the no-op path too.
nix copy --from <attic> only pulls from that single store, so nixpkgs
deps (e.g. sqlite) that Attic skips and leaves on cache.nixos.org were
missing -> 'path is not valid'. Realize the closure through the machine's
substituters so the app comes from the dev Attic and its upstream deps
resolve from cache.nixos.org, without building from source.
Add a radiantwave-updater NixOS module that polls a manifest on the
fileserver and swaps the app pointer /var/lib/radiantwave/current to new
closures fetched from the dev Attic cache. Closures are fetched with
'nix copy --from', never built from source; the swap is atomic via
mv -T.
Enable it on the -dev variants only for now: the login shell launches
from /var/lib/radiantwave/current/bin/radiantwave when enabled, and from
the immutable system path otherwise, so prod behavior is unchanged. The
pointer is seeded on first boot to the baseline copy already baked into
the closure (no duplication).
HDMI-A-1 refers to the HDMI port closest to the power cable.
In all models, we end up connecting HDMI to port 2.
HDMI-A-1 was likely taking over, becuase it suddenly had a valid
EDID assigned, indicating 'a monitor is connected here'
NeilClack