docker-compose.yml

#
#      Brno University of Technology
#      Faculty of Information Technology
#
#      BSc Thesis       2006/2007
#
#      Railway Interlocking Simulator
#
#      Dockerization: 2025
#      Optimized: 2026-01 (BuildKit cache mounts)
#      Security fix: 2026-06 (BuildKit secrets for GitHub Packages token)
#
#      Docker Compose orchestration for interlockSim project
#
#      Usage:
#        # Build services:
#        docker compose build app        # Build app (kDisco downloaded from GitHub Packages)
#        docker compose build text       # Build LaTeX thesis
#
#        # Run GUI editor (requires X11):
#        docker compose up app
#
#        # Run simulation with example:
#        docker compose run app java -jar interlockSim.jar example shuntingLoop 60
#
#        # Run simulation with custom XML:
#        docker compose run -v $(pwd)/myfile.xml:/app/myfile.xml app java -jar interlockSim.jar sim myfile.xml
#
#      GitHub Packages authentication:
#        Set GITHUB_ACTOR and GITHUB_TOKEN and EXPORT them before building. The
#        token is passed to the build as a BuildKit secret (secrets.environment
#        below) so it never appears in the resolved RUN command, image layers, or
#        docker history. Because the secret provider reads the *process* env (not
#        .env, which compose only auto-loads for ${VAR} interpolation), a .env
#        file alone is NOT enough -- export it first:
#
#            set -a; source .env; set +a
#            docker compose up --build
#
#        A non-exported .env yields an empty token and a 401 from GitHub Packages.
#

services:
  # Build and run Java application with GUI support
  # kDisco is automatically downloaded from GitHub Packages or uses local Maven cache
  app:
    build:
      context: .
      dockerfile: Dockerfile
      target: runner
      args:
        # Non-sensitive cache hint only
        BUILDKIT_INLINE_CACHE: 1
      secrets:
        # GitHub Packages credentials for kDisco dependency.
        # Values are read from host environment variables and mounted as BuildKit
        # secrets at /run/secrets/github_actor and /run/secrets/github_token.
        - github_actor
        - github_token
    image: interlocksim:latest
    environment:
      # Pass host DISPLAY to container for X11 forwarding
      - DISPLAY=${DISPLAY:-host.docker.internal:0}
      # Pass X11 authentication
      - XAUTHORITY=/tmp/.docker.xauth
    volumes:
      # Mount X11 socket for GUI display
      - /tmp/.X11-unix:/tmp/.X11-unix:rw
      # Mount X11 authentication file
      - ${XAUTHORITY:-$HOME/.Xauthority}:/tmp/.docker.xauth:ro
      # Mount local directory to extract artifacts
      - ./artifacts/app:/artifacts
      # Optional: mount XML files for simulation
      # - ./src/main/resources:/app/xml:ro
    network_mode: host
    container_name: interlocksim-app
    # Allow X11 forwarding
    security_opt:
      - seccomp:unconfined
    # Optional: uncomment to keep container running for debugging
    # stdin_open: true
    # tty: true

  # Native fast-sim CLI binary (no JVM, minimal image)
  # Usage:
  #   docker compose build fast-sim
  #   docker compose run fast-sim example shuntingLoop 60
  fast-sim:
    build:
      context: .
      dockerfile: Dockerfile.fast-sim
      args:
        # Non-sensitive cache hint only
        BUILDKIT_INLINE_CACHE: 1
      secrets:
        # GitHub Packages credentials for kDisco dependency (see app service above).
        - github_actor
        - github_token
    image: interlocksim-fast-sim:latest
    container_name: interlocksim-fast-sim
    command: ["example", "shuntingLoop", "60"]

  # Build LaTeX thesis with Czech language tools
  text:
    build:
      context: .
      dockerfile: text/Dockerfile
      args:
        BUILDKIT_INLINE_CACHE: 1
    image: interlocksim-text:latest
    volumes:
      # Mount local directory to extract artifacts
      - ./artifacts/text:/artifacts
    container_name: interlocksim-text-build
    # Optional: uncomment to see more detailed build output
    # stdin_open: true
    # tty: true

# Explicit network for clarity (optional)
networks:
  default:
    name: interlocksim-network

# BuildKit secrets: map host environment variables to secret IDs used in Dockerfiles.
# The values are mounted at runtime and are not persisted in the image.
secrets:
  github_actor:
    environment: GITHUB_ACTOR
  github_token:
    environment: GITHUB_TOKEN

# Note: BuildKit cache mounts are managed in Dockerfiles, not here
# Runtime volumes can be added here if needed in the future
volumes: {}