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MaxsTechReview
d9cd0d2cc8
* Run programs, scripts and AppImages from the desktop Windows programs open with the Proton Steam has chosen, and a Steam game's own launch program is handed to Steam. x86-64 Linux programs and game scripts run under FEX, and an exec the kernel refuses goes to droiddeck-open through libblsession's binfmt.c. Programs on noexec shared storage pass KIO's checks; a folder of Linux programs there, and sharun AppImages, are added by the app once and run from the copy. Executable scripts run without KIO's prompt, mpv plays on the software desktop, FEXServer's socket moves under XDG_RUNTIME_DIR, and Proton runtimes no longer show up as games. * Switch to Desktop from Big Picture without Deck mode Big Picture's Switch to Desktop asks the client's SteamOS manager, which the client only has when started as SteamOS (Deck mode). Without it the request failed and the screen stayed on "Switching to Desktop..." for good. The live compat helper now sees the request on its way to the client and hands it to steamos-session-select, which opens the KDE desktop as Deck mode already did. * Run x86 programs from shared storage where they lie FEX asks for the guest's PROT_EXEC when it maps a program or library, which the kernel refuses on noexec shared storage; FEX never runs those pages itself, so libblsession maps them without it in FEX's processes. An x86 game, its libraries and its start script now run in place instead of being copied in; only native code on noexec storage is still copied. A Steam library's games are never copied, and a Linux game's launch program opened from the desktop goes to Steam like a Windows one.
143 lines
10 KiB
Bash
143 lines
10 KiB
Bash
#!/bin/bash
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# The desktop session: KDE Plasma, set up as SteamOS's desktop mode - KWin nested as a client of the
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# app's compositor, Plasma's shell on it, and Xwayland for the X11 programs (the Steam client, most
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# emulators). Run by droiddeck-session in place of gamescope for mode "lxqt" (the mode's name from
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# the LXQt desktop this replaced; it is what the app and its preferences use).
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# Staged by the app over the desktop package's copy on every launch, so a fix here reaches an
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# installed desktop without re-downloading the package.
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set -u
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export XDG_SESSION_TYPE=wayland XDG_CURRENT_DESKTOP=KDE XDG_SESSION_DESKTOP=KDE DESKTOP_SESSION=plasma
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export KDE_FULL_SESSION=true KDE_SESSION_VERSION=6 KDE_APPLICATIONS_AS_SCOPE=0
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# Qt tries Wayland and falls back to X11 (Xwayland): an AppImage that bundles only Qt's xcb
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# plugin - melonDS - exits at once on a plain "wayland" ("Could not find the Qt platform plugin").
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export QT_QPA_PLATFORM="wayland;xcb" GDK_BACKEND=wayland,x11 SDL_VIDEODRIVER=wayland,x11
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unset QT_QPA_PLATFORMTHEME
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# KDE's programs log through Qt, which writes to the journal when stderr is not a terminal; there is
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# no journal here, so their messages go to the desktop log with everything else.
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export QT_FORCE_STDERR_LOGGING=1
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# SteamOS's /etc/profile.d/kde.sh.
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export MOZ_ENABLE_WAYLAND=1 MOZ_USE_XINPUT2=1
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# Konsole's profile starts the login shell, which it finds here.
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export SHELL=/bin/bash
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# Firefox's child processes sandbox themselves with seccomp and namespaces, neither of which
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# behaves under proot: the content process ends up unable to read the font files its parent can,
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# reports "no fonts" and dies - the tab crash, with the chrome around it still drawing text.
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# The prefs for this are only advisory and a profile can override them; the environment is not.
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export MOZ_DISABLE_CONTENT_SANDBOX=1 MOZ_DISABLE_GMP_SANDBOX=1 MOZ_DISABLE_RDD_SANDBOX=1
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export MOZ_DISABLE_SOCKET_PROCESS_SANDBOX=1 MOZ_DISABLE_UTILITY_SANDBOX=1
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# Firefox seals the size of the shared memory it hands a tab; on Android 16 (Galaxy S25/S26,
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# RedMagic) adding the seal fails, Firefox only warns, and the tab refuses the unsealed memory
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# ("Shared memory PlatformHandle is not safe to map") and dies on signal 11 - every page. Firefox's
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# own switch skips the seals. (#280; the line went missing in the fontconfig move of #252.)
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export MOZ_SHM_NO_SEALS=1
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# KWin composites in software (QPainter): its GPU path allocates through gbm on a DRM render node,
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# and the KGSL stand-in is not one. Its windows get shm buffers only, so GL programs on it draw with
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# Mesa's software rasterizer, Plasma's own Qt Quick draws with Qt's software renderer (plasmashell
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# crashes on llvmpipe here), and a Vulkan program cannot draw at all: games and emulators from the
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# menu run through droiddeck-gpu (their own gamescope on the app's compositor), and Steam goes back
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# to the app as a Steam session - SteamOS's "Return to Gaming Mode". The session's own GL choice
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# (zink on Turnip, for the Steam client) is put back by droiddeck-gpu.
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export KWIN_COMPOSE=Q QT_QUICK_BACKEND=software LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe
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# mpv refuses that software GL and then fails its X11 fallback (an assertion): allowed it, it plays.
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[ -e /etc/mpv/mpv.conf ] || { mkdir -p /etc/mpv && echo gpu-sw=yes >/etc/mpv/mpv.conf; } 2>/dev/null
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export DROIDDECK_NESTED_SCALE=1
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export DROIDDECK_GLTHREAD=${mesa_glthread:-}
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unset MESA_LOADER_DRIVER_OVERRIDE LIBGL_KOPPER_DRI2 mesa_glthread
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# The desktop's own log, beside the session's, so KWin and the programs on it can be read apart
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# from the session that started them. The session log keeps the milestones either way.
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if [ -n "${BL_DEBUG_DIR:-}" ]; then
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mkdir -p "$BL_DEBUG_DIR" 2>/dev/null || true
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exec >>"$BL_DEBUG_DIR/desktop.log" 2>&1
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echo "== droiddeck-desktop $(date -u '+%Y-%m-%d %H:%M:%S UTC') ${BL_WIDTH:-1280}x${BL_HEIGHT:-720}"
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fi
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# The runtime directory outlives a session. KDE's daemons are single-instance programs that leave a
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# lock and a socket there; finding last session's, they decide they are already running and exit
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# without a word. Only the app's own compositor socket (wayland-0) is kept.
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find "$XDG_RUNTIME_DIR" -mindepth 1 -maxdepth 1 ! -name 'wayland-0*' ! -name 'keymap.xkb' -exec rm -rf {} + 2>/dev/null
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chmod 700 "$XDG_RUNTIME_DIR" 2>/dev/null
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# KWin will not start Xwayland when its socket directory is not sticky, as a shared /tmp would be,
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# and Plasma's session manager cannot listen at all without the ICE directory, which only root may
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# create for it.
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mkdir -p /tmp/.X11-unix /tmp/.ICE-unix && chmod 1777 /tmp/.X11-unix /tmp/.ICE-unix 2>/dev/null
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# Fontconfig defaults and Android language fallbacks are set up by droiddeck-session before this
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# script or any desktop program starts.
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# The menu's "Steam" / "Steam Big Picture" entries and one entry per installed game: all of them
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# hand off to the app (droiddeck-steam-launch), since the client cannot draw on this desktop.
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export BL_DESKTOP=1
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ln -sf /usr/local/bin/droiddeck-steam-launch /usr/local/bin/steamdeck-steam 2>/dev/null
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ln -sf /usr/local/bin/droiddeck-steam-shim /usr/local/bin/steam 2>/dev/null
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python3 /usr/local/bin/droiddeck-desktop-games 2>&1 | sed 's/^/[games] /'
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# Player 1 on the controller in every emulator that has no profile of its own yet - now, and again
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# every half minute: an emulator started for the first time writes its own config, which is then
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# given the controller for its next start without waiting for the next desktop.
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python3 /usr/local/bin/droiddeck-pad-defaults 2>&1 | sed 's/^/[pads] /'
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( while sleep 30; do python3 /usr/local/bin/droiddeck-pad-defaults 2>&1 | sed 's/^/[pads] /'; done ) &
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# Games and emulators from the menu run through droiddeck-gpu; BL_DESKTOP_GPU=on/off overrides,
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# and each entry keeps "Run in a desktop window" either way.
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python3 /usr/local/bin/droiddeck-desktop-gpu 2>&1 | sed 's/^/[gpu] /'
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# The windowed action still opens melonDS at the size/placement the LXQt desktop used.
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/usr/local/bin/droiddeck-desktop-window-rules 2>&1 | sed 's/^/[rules] /'
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# Windows programs, Linux programs, AppImages and scripts open with droiddeck-open (Steam's Proton,
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# FEX for x86); an exec the kernel refuses is handed to it as well (libblsession's binfmt.c). An
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# AppImage run directly cannot mount itself under proot, so it unpacks itself to run.
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python3 /usr/local/bin/droiddeck-open --install 2>&1 | sed 's/^/[open] /'
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export APPIMAGE_EXTRACT_AND_RUN=1
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# A click runs an executable script or program without KIO asking first; Dolphin's settings can still ask.
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[ -e /etc/xdg/kiorc ] || printf '[Executable scripts]\nbehaviourOnLaunch=execute\n' >/etc/xdg/kiorc 2>/dev/null
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# SteamOS's desktop icons: Return to Gaming Mode and Steam, put there once - what the user moves
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# or deletes stays that way.
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desktop_dir=$(xdg-user-dir DESKTOP 2>/dev/null); [ -n "$desktop_dir" ] && [ "$desktop_dir" != "$HOME" ] || desktop_dir=$HOME/Desktop
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if [ ! -e "$HOME/.config/droiddeck-desktop-icons" ]; then
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mkdir -p "$desktop_dir" "$HOME/.config"
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cp -f /usr/share/applications/droiddeck-return-gaming.desktop "$desktop_dir/Return.desktop" 2>/dev/null
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cp -f /usr/share/applications/steamdeck-steam.desktop "$desktop_dir/steam.desktop" 2>/dev/null
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chmod +x "$desktop_dir"/*.desktop 2>/dev/null
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touch "$HOME/.config/droiddeck-desktop-icons"
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fi
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# A Return icon still there is kept current with the package's entry (what it runs has changed).
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[ -f "$desktop_dir/Return.desktop" ] && cp -f /usr/share/applications/droiddeck-return-gaming.desktop "$desktop_dir/Return.desktop" 2>/dev/null
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# Plasma's caches of the menu, the icons and the MIME types, which a package install never ran.
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update-mime-database /usr/share/mime >/dev/null 2>&1 &
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[ -f /usr/share/icons/hicolor/icon-theme.cache ] || gtk-update-icon-cache -q -t /usr/share/icons/hicolor 2>/dev/null &
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[ -f /usr/share/glib-2.0/schemas/gschemas.compiled ] || glib-compile-schemas /usr/share/glib-2.0/schemas 2>/dev/null
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# In debug runs Firefox (started from the panel or the menu, so it inherits this) writes its
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# own network log: name lookups, connects, HTTP transactions, the link/offline decisions.
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if [ -f "$HOME/.droiddeck-desktop-debug" ]; then
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mkdir -p "$HOME/.cache/droiddeck"
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export MOZ_LOG="nsHttp:3,nsSocketTransport:3,nsHostResolver:4,NetworkLinkService:5,NetworkConnectivityService:5,nsIOService:5"
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export MOZ_LOG_FILE="$HOME/.cache/droiddeck/firefox-net.log"
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export QT_LOGGING_RULES="kwin_*.debug=true"
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fi
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# Remote runs, for driving the desktop from a debugger: with ~/.droiddeck-remote-run present (only
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# the app or root can create it), each script dropped into ~/.cache/droiddeck/run/ is run once,
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# inside the session with its environment, its output tagged into the desktop log.
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if [ -f "$HOME/.droiddeck-remote-run" ]; then
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mkdir -p "$HOME/.cache/droiddeck/run"
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(
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while sleep 1; do
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for f in "$HOME"/.cache/droiddeck/run/*.sh; do
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[ -f "$f" ] || continue
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mv -f "$f" "$f.running" || continue
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( echo "[run] $(basename "$f") started"; WAYLAND_DISPLAY=wayland-1 DISPLAY=:1 bash "$f.running" 2>&1 | sed "s/^/[run] /"; echo "[run] $(basename "$f") exited"; rm -f "$f.running" ) &
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done
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done
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) &
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fi
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# Plasma as its own login starts it: startplasma-wayland sets up the session's environment and runs
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# plasma_session, which starts KWin (through kwin_wayland_wrapper, ours first on PATH) as a client of
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# the app's compositor with its own Xwayland, then Plasma's daemons, shell and autostart entries on
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# it. The session bus is ours: Plasma, the file manager and the portal all expect one.
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echo "== droiddeck-desktop: Plasma on $WAYLAND_DISPLAY"
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dbus-run-session -- startplasma-wayland
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rc=$?
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echo "== droiddeck-desktop: Plasma ended ($rc)"
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# Plasma logged out - Log Out, or Return to Gaming Mode, which logs out the same way, so open windows
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# are asked to close (and to save) first. As on SteamOS, leaving the desktop goes to Gaming Mode: the
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# app is asked for a Steam session, and it ends this one to start it. A desktop the app stops never
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# gets here; a Plasma that failed does not count as a logout.
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if [ "$rc" -eq 0 ]; then
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/usr/local/bin/droiddeck-steam-launch bigpicture
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sleep 30
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fi
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exit $rc
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