entrypoint.sh

#!/usr/bin/env bash
set -euo pipefail

echo "[entrypoint] starting up"

mkdir -p /tmp/.X11-unix
chmod 1777 /tmp/.X11-unix 2>/dev/null || true

pkill -x Xvfb 2>/dev/null || true
rm -f /tmp/.X11-unix/X99 2>/dev/null || true

echo "[entrypoint] starting Xvfb on :99"
Xvfb :99 -screen 0 1280x720x24 \
    -ac \
    +extension GLX \
    +extension RANDR \
    +render \
    -noreset \
    -nolisten tcp >/tmp/xvfb.log 2>&1 &

XVFB_PID=$!

cleanup() {
    echo "[entrypoint] shutting down"
    kill "$XVFB_PID" 2>/dev/null || true
    wait "$XVFB_PID" 2>/dev/null || true
}
trap cleanup SIGTERM SIGINT EXIT

for i in $(seq 1 40); do
    if xdpyinfo -display :99 >/dev/null 2>&1; then
        echo "[entrypoint] display :99 is ready"
        break
    fi
    if ! kill -0 "$XVFB_PID" >/dev/null 2>&1; then
        echo "[entrypoint] Xvfb died early"
        cat /tmp/xvfb.log || true
        exit 1
    fi
    sleep 0.5
done

export DISPLAY=:99
echo "[entrypoint] DISPLAY=$DISPLAY"

exec python -u server.py