Fix Steam login flicker with 2GB shm and stable launch scripts.

Use tini-backed entrypoint, two-phase Steam startup, and a window keeper so CEF UI and the fluxbox toolbar stay visible in Moonlight.

Co-authored-by: Cursor <cursoragent@cursor.com>

players/p4_config/start-steam.sh

@@ -0,0 +1,118 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+exec 9>/tmp/start-steam.lock
+flock -n 9 || exit 0
+
+id steam >/dev/null 2>&1 || useradd -m -s /bin/bash steam
+STEAM_UID="$(id -u steam)"
+
+ROOT=/home/steam/.local/share/Steam/debian-installation
+mkdir -p "${ROOT}" /tmp/xdg-steam /home/steam/tmp /run/dbus
+ln -sfn /home/steam/.local/share/Steam /home/steam/.steam
+chown -R steam:steam /home/steam /tmp/xdg-steam
+
+ensure_dbus() {
+  if ! dbus-send --system --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListNames >/dev/null 2>&1; then
+    rm -f /run/dbus/pid
+    dbus-daemon --system --fork >/dev/null 2>&1 || true
+  fi
+}
+
+ensure_fluxbox() {
+  cp -f /etc/game-server/fluxbox/init /root/.fluxbox/init 2>/dev/null || true
+  if ps -eo stat=,comm= 2>/dev/null | awk '$2=="fluxbox" && $1 !~ /Z/ { exit 0 } END { exit 1 }'; then
+    FB="$(ps -eo pid=,stat=,comm= | awk '$3=="fluxbox" && $2 !~ /Z/ {print $1; exit}')"
+    DISPLAY=:99 fluxbox-remote reloadconfig 2>/dev/null || kill -USR1 "${FB}" 2>/dev/null || true
+    return 0
+  fi
+  DISPLAY=:99 HOME=/root fluxbox >/dev/null 2>&1 &
+  sleep 1
+}
+
+restart_fluxbox() {
+  pkill -x fluxbox >/dev/null 2>&1 || true
+  sleep 1
+  cp -f /etc/game-server/fluxbox/init /root/.fluxbox/init 2>/dev/null || true
+  DISPLAY=:99 HOME=/root fluxbox >/dev/null 2>&1 &
+  sleep 1
+  DISPLAY=:99 xsetroot -solid "#3c3c3c" 2>/dev/null || true
+}
+
+steam_running() {
+  pgrep -u steam -f "${ROOT}/ubuntu12_32/steam -srt-logger-opened" >/dev/null 2>&1
+}
+
+steam_ui_visible() {
+  DISPLAY=:99 xwininfo -root -tree 2>/dev/null | grep -qE "Steam Big Picture Mode|Sign in to Steam"
+}
+
+ensure_window_keeper() {
+  command -v xdotool >/dev/null 2>&1 || return 0
+  pgrep -f keep-steam-window.sh >/dev/null 2>&1 && return 0
+  setsid bash /root/.config/sunshine/keep-steam-window.sh >/dev/null 2>&1 &
+}
+
+schedule_gamepadui_once() {
+  [ -f /tmp/steam-gamepadui-done ] && return 0
+  setsid bash -lc '
+    for _ in $(seq 1 90); do
+      pgrep -u steam -f steamwebhelper >/dev/null 2>&1 && break
+      sleep 1
+    done
+    sleep 5
+    runuser -u steam -- env \
+      DISPLAY=:99 \
+      HOME=/home/steam \
+      XDG_RUNTIME_DIR=/tmp/xdg-steam \
+      TMPDIR=/home/steam/tmp \
+      LANG=en_US.UTF-8 \
+      LC_ALL=en_US.UTF-8 \
+      /usr/games/steam steam://open/gamepadui >/dev/null 2>&1 || true
+    touch /tmp/steam-gamepadui-done
+  ' >/dev/null 2>&1 &
+}
+
+stop_steam() {
+  pkill -9 -u steam -f "steam|steamwebhelper|steam-runtime|steam-runtime-launcher" >/dev/null 2>&1 || true
+  pkill -f keep-steam-window.sh >/dev/null 2>&1 || true
+  sleep 1
+  rm -f /home/steam/.local/share/Steam/steam.pid \
+        /home/steam/.local/share/Steam/steam.pipe \
+        /home/steam/.local/share/Steam/steam.token \
+        /tmp/steam-gamepadui-done
+  rm -rf /home/steam/.local/share/Steam/debian-installation/config/htmlcache
+  rm -rf /tmp/dumps/completed /tmp/dumps/*.lock 2>/dev/null || true
+  rm -f /dev/shm/u"${STEAM_UID}"-* /dev/shm/u"${STEAM_UID}"-ValveIPC* /dev/shm/.org.chromium.* /dev/shm/pulse-* 2>/dev/null || true
+}
+
+ensure_dbus
+restart_fluxbox
+
+if steam_running; then
+  if steam_ui_visible; then
+    ensure_window_keeper
+    exit 0
+  fi
+  schedule_gamepadui_once
+  ensure_window_keeper
+  exit 0
+fi
+
+stop_steam
+ensure_dbus
+restart_fluxbox
+
+setsid runuser -u steam -- env \
+  DISPLAY=:99 \
+  HOME=/home/steam \
+  XDG_RUNTIME_DIR=/tmp/xdg-steam \
+  TMPDIR=/home/steam/tmp \
+  LANG=en_US.UTF-8 \
+  LC_ALL=en_US.UTF-8 \
+  bash -lc "cd ${ROOT} && exec /usr/games/steam -silent -no-cef-sandbox" \
+  >>/home/steam/steam-app.log 2>&1 &
+
+schedule_gamepadui_once
+ensure_window_keeper
+exit 0