name: pglc-demo
services:
  postgres:
    build:
      # pg_local_cache 2.0.1; the demo does not track a moving branch.
      context: https://github.com/profundium/pg_local_cache.git#8569a937abb9ba1859ffb9c2a4dbc34f076fbe20
      target: extension
      args:
        POSTGRES_MAJOR: "${PGLC_DEMO_PG:-16}"
        POSTGRES_VARIANT: bookworm
        PGLC_BUILD_ID: 8569a937abb9ba1859ffb9c2a4dbc34f076fbe20
    environment:
      PGDATA: /var/lib/postgresql/data
      POSTGRES_DB: pglc_demo
      POSTGRES_PASSWORD: demo-only
    ports:
      - "127.0.0.1:${PGLC_DEMO_PORT:-55432}:5432"
    shm_size: 256mb
    # No existing data directory or persistent volume is mounted.
    tmpfs:
      - /var/lib/postgresql/data
    command:
      - postgres
      - -c
      - shared_preload_libraries=pg_local_cache
      - -c
      - pg_local_cache.database=pglc_demo
      - -c
      - pg_local_cache.port=0
      - -c
      - pg_local_cache.cache_entries=1024
      - -c
      - pg_local_cache.memory_budget_mb=384
    volumes:
      - ./init.sql:/docker-entrypoint-initdb.d/010-demo.sql:ro
    healthcheck:
      test: [CMD-SHELL, "pg_isready -U postgres -d pglc_demo -h 127.0.0.1"]
      interval: 2s
      timeout: 5s
      retries: 30