Dockerfile for running Firefox in a VNC session with Playwright

playwright-vnc

# Use specific version for better reproducibility
FROM mcr.microsoft.com/playwright:v1.42.1

# Set build arguments for non-sensitive configurable values
ARG RESOLUTION=1920x1080
ARG VNC_PORT=5901

# Set environment variables
ENV DEBIAN_FRONTEND=noninteractive \
    DISPLAY=:1 \
    RESOLUTION=${RESOLUTION} \
    VNC_PORT=${VNC_PORT} \
    USER=root

# Install dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    tightvncserver \
    dbus-x11 \
    xfonts-base \
    x11vnc \
    openbox \
    libpci3 \
    adwaita-icon-theme \
    gnome-themes-standard \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

# Create .vnc directory
RUN mkdir -p /root/.vnc

# Create Firefox profile directory
RUN mkdir -p /root/.mozilla/firefox/temp-profile && \
    chmod 755 /root/.mozilla/firefox/temp-profile

# Create xstartup script
RUN <<EOF cat > /root/.vnc/xstartup
#!/bin/sh
set -x  # Enable debug output

start_session() {
    echo "Starting X session..."

    # Basic X setup
    xsetroot -solid grey
    vncconfig -iconic &

    echo "Starting window manager..."
    openbox-session &

    echo "Waiting for X to be ready..."
    sleep 3

    start_firefox
}

start_firefox() {
    echo "Starting Firefox..."
    # Try to find Firefox
    FIREFOX_PATH=\$(find /ms-playwright -name firefox -type f | head -n 1)
    echo "Found Firefox at: \$FIREFOX_PATH"

    # Create a new temporary profile directory
    TEMP_PROFILE=\$(mktemp -d)
    echo "Created new temporary profile at: \$TEMP_PROFILE"

    # Start Firefox with new temporary profile
    \$FIREFOX_PATH --no-remote --new-instance --profile \$TEMP_PROFILE &
    FIREFOX_PID=\$!

    echo "Firefox started with PID \$FIREFOX_PID"

    # Clean up old temporary profiles
    find /tmp -maxdepth 1 -type d -name "tmp.*" -mmin +5 -exec rm -rf {} \; 2>/dev/null || true
}

# Function to handle cleanup
cleanup() {
    echo "Cleaning up..."
    kill \$FIREFOX_PID 2>/dev/null || true
    killall openbox 2>/dev/null || true
    vncserver -kill :1 || true
}

# Set up signal handling
trap cleanup SIGTERM SIGINT

# Start initial session
start_session

# Monitor both VNC and Firefox
while true; do
    # Check VNC
    if ! pgrep -f "Xtightvnc" > /dev/null; then
        echo "VNC server stopped, restarting..."
        cleanup
        sleep 2
        start_session
        continue
    fi

    # Check Firefox
    if ! kill -0 \$FIREFOX_PID 2>/dev/null; then
        echo "Firefox stopped, restarting..."
        kill \$FIREFOX_PID 2>/dev/null || true
        sleep 2
        start_firefox
    fi

    sleep 1
done
EOF

RUN chmod +x /root/.vnc/xstartup

# Create startup script
RUN <<EOF cat > /start.sh
#!/bin/bash
set -e

if [ -z "\$VNC_PASSWORD" ]; then
    echo "Error: VNC_PASSWORD environment variable is not set"
    exit 1
fi

echo "\$VNC_PASSWORD" | vncpasswd -f > /root/.vnc/passwd
chmod 600 /root/.vnc/passwd

echo "Starting VNC server at \$RESOLUTION..."
vncserver -kill :1 || true
vncserver -geometry \$RESOLUTION

# Keep container running
tail -f /dev/null
EOF

RUN chmod +x /start.sh

# Expose VNC port
EXPOSE ${VNC_PORT}

# Set entrypoint
ENTRYPOINT ["/start.sh"]