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punktfunk/crates/pf-vdisplay
enricobuehler 58b27acbd5
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fix(vdisplay/session): scrub the dead desktop's WAYLAND_DISPLAY from the user-manager env
settle_desktop_portal pushes the live desktop's WAYLAND_DISPLAY into the
systemd --user manager (import-environment) so a re-activated portal inherits
the right session — but the import PERSISTS after that desktop dies. Every
later user unit then inherits the stale socket, including
gamescope-session.target: gamescope sees WAYLAND_DISPLAY, runs NESTED, and
aborts with "Failed to connect to wayland socket: wayland-0" — observed live
on a Deck, where Game Mode could not start at all (autologin crash-looped)
until the var was unset by hand.

Two-layer fix, mirroring the protection launch_session already gives its
transient unit:
- observe_session_instance: when a desktop compositor instance goes away,
  unset WAYLAND_DISPLAY/DISPLAY from the manager env (a desktop bounce is
  harmless — the next portal settle re-imports).
- write_steamos_dropin: UnsetEnvironment=DISPLAY WAYLAND_DISPLAY on the
  takeover drop-in, unit-scoped belt-and-suspenders for host-initiated
  restarts.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-21 11:06:55 +02:00
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