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punktfunk/packaging/bazzite/host.env
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feat(host/vdisplay): per-connect active-session backend selection
Bazzite/SteamOS boxes flip between Steam Gaming Mode (gamescope) and a
KDE/GNOME desktop. The host statically read PUNKTFUNK_COMPOSITOR /
XDG_CURRENT_DESKTOP once, so switching to Desktop Mode failed the stream, and
the gamescope managed-session path stopped+relaunched the autologin per connect
— leaking GPU context on F44 (reconnect → black screen).

Replace the static read with a runtime probe of the live session and route each
connect to the right backend, churn-free:

- vdisplay::detect_active_session() probes /proc for the running compositor of
  our uid (gamescope|kwin_wayland|gnome-shell|sway, desktop outranks a leftover
  gamescope) + scans the runtime dir for the live wayland-* socket. Returns an
  ActiveKind + the SessionEnv (WAYLAND_DISPLAY/XDG_RUNTIME_DIR/DBUS/
  XDG_CURRENT_DESKTOP) that targets it.
- apply_session_env() writes that into the process env per connect (host serves
  one session at a time), so every backend (capture + input) opens against the
  live session; apply_input_env() points input at the matching backend and
  selects gamescope ATTACH (no managed restart) unless PUNKTFUNK_GAMESCOPE_MANAGED.
- resolve_compositor() (native path) auto-detects + applies; explicit
  PUNKTFUNK_COMPOSITOR still wins (legacy/CI/forcing). detect() is now
  active-aware for the GameStream/mgmt callers too.
- Bazzite host.env drops the static gamescope force; documents auto-detection
  + the optional overrides.

Result: Desktop Mode → KWin/Mutter virtual output at the client's mode
(churn-free, the reliable path); Gaming Mode → attach to the running gamescope
(no SIGSEGV/GPU leak on reconnect). Compiles + clippy-clean; 78 host tests pass.
Live validation on the Bazzite box pending (box offline).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-14 21:41:51 +00:00

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# punktfunk host config for Bazzite (~/.config/punktfunk/host.env).
#
# The compositor + input backend are AUTO-DETECTED per connect from the ACTIVE session: the host
# follows the box as you flip between Steam Gaming Mode (gamescope — attached to the running
# session, no churn) and a KDE/GNOME Desktop (KWin/Mutter virtual output at the client's mode).
# So nothing here forces a backend — only the trustworthy anchors stay.
XDG_RUNTIME_DIR=/run/user/1000
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
PUNKTFUNK_VIDEO_SOURCE=virtual
# GPU zero-copy capture (dmabuf -> CUDA -> NVENC). Auto-falls back to CPU if unavailable.
PUNKTFUNK_ZEROCOPY=1
#RUST_LOG=info
# --- Optional overrides (default is active-session auto-detection) ---
# Force a specific backend for testing (skips auto-detect + env retargeting):
# PUNKTFUNK_COMPOSITOR=kwin|mutter|wlroots|gamescope
# PUNKTFUNK_INPUT_BACKEND=libei|wlr|gamescope|uinput
# Opt into the host-MANAGED gamescope session (spawns gamescope-session-plus at the client mode,
# stops the autologin gaming session for the duration) instead of attaching to the running one:
# PUNKTFUNK_GAMESCOPE_MANAGED=1
# PUNKTFUNK_GAMESCOPE_APP=steam -gamepadui