docker/entrypoint.sh

#!/bin/sh
set -eu

cd /app

puzzle_dir="data/lichess-puzzles/data"
has_puzzles=0
if [ -d "$puzzle_dir" ]; then
  for f in "$puzzle_dir"/train-*.parquet; do
    if [ -f "$f" ]; then
      has_puzzles=1
      break
    fi
  done
fi

if [ "$has_puzzles" -eq 0 ]; then
  if [ "${DOWNLOAD_PUZZLES:-0}" = "1" ]; then
    echo ">>> No local puzzle shards — downloading HF shard 0 (~300 MB)"
    python -m chess_tutor.download_lichess_puzzles --shard 0
  else
    echo ">>> No puzzle shards in image (puzzle ladders disabled)."
    echo "    Copy data/lichess-puzzles/ before docker build, or run with DOWNLOAD_PUZZLES=1"
  fi
fi

HOST="${HOST:-0.0.0.0}"
PORT="${PORT:-8765}"
echo ">>> Chess Tutor web UI at http://${HOST}:${PORT}/"
exec python -m chess_tutor.web --host "${HOST}" --port "${PORT}"