stderr echo + stdbuf for log visibility; trace x11vnc/noVNC

Dockerfile

@@ -40,7 +40,8 @@ COPY ubuntu-desktop/start-desktop.sh /opt/start-desktop.sh
 RUN chmod +x /scripts/entrypoint.sh /opt/start-desktop.sh
 
 ENV PERSIST_PATH=/data
-ENV RUN_CMD="/opt/start-desktop.sh"
+# stdbuf so echo/flush shows in HF run log without delay
+ENV RUN_CMD="stdbuf -oL -eL /opt/start-desktop.sh"
 ENV DESKTOP_HOME=/data/desktop-home
 ENV DISPLAY=:99
 ENV VNC_PORT=5901

ubuntu-desktop/start-desktop.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 # Start Ubuntu desktop: Xvfb + XFCE + x11vnc + noVNC on 7860
 # HOME is set to persistent dir by caller (sync/entrypoint). Here we ensure and use it.
-echo "[start-desktop] Starting ..."
+echo "[start-desktop] Starting ..." >&2
 set -e
 
 export PERSIST_PATH="${PERSIST_PATH:-/data}"
@@ -28,7 +28,7 @@ dbus-daemon --session 2>/dev/null || true
 startxfce4 &
 DESKTOP_PID=$!
 sleep 3
-echo "[start-desktop] XFCE started, starting x11vnc ..."
+echo "[start-desktop] XFCE started, starting x11vnc ..." >&2
 
 # x11vnc: share display :99 on port 5901 (do not exit on failure so noVNC can still start)
 x11vnc -display "$DISPLAY" -rfbport "$VNC_PORT" -forever -shared -noxdamage -bg || true
@@ -51,6 +51,6 @@ fi
 set -e
 
 # noVNC: must run in foreground; listen on 0.0.0.0 so HF proxy can reach it
-echo "[start-desktop] Starting noVNC on 0.0.0.0:$NOVNC_PORT ..."
+echo "[start-desktop] Starting noVNC on 0.0.0.0:$NOVNC_PORT ..." >&2
 # Use bash -c so novnc_proxy runs as main process; if it exits, keep container alive with sleep
 exec /bin/bash -c "cd /opt/noVNC && ./utils/novnc_proxy --listen 0.0.0.0:$NOVNC_PORT --vnc localhost:$VNC_PORT --web /opt/noVNC" || exec sleep infinity