bookstore/docker-compose.yml

# wordpress and cron are the same image and MUST share the same
# environment: the official image's wp-config.php reads getenv() live, at
# PHP runtime, in whichever container is executing — it does not bake
# values into the file once. If cron's env drifts from wordpress's (e.g.
# WORDPRESS_CONFIG_EXTRA missing), cron silently loses WP_REDIS_HOST,
# DISABLE_WP_CRON, etc. The anchor below is what prevents that drift.
# DB_PASSWORD/DB_ROOT_PASSWORD are deliberately NOT passed via ${VAR} here.
# Docker Compose's own interpolation mangles any value containing a `$`
# followed by a letter (confirmed with a bcrypt hash earlier, and again with
# a plain generated password: "$BRjTx3tlmSpz" got silently blanked out,
# breaking the DB connection). The official mariadb/wordpress images both
# support a `_FILE` convention specifically for this — point at a file path
# (never risky) and the container reads the raw contents itself, bypassing
# Compose's interpolation entirely. deploy.sh writes these files fresh from
# .env.<environment> before every `up`.
#
# These are plain bind mounts, NOT Compose's native `secrets:` block —
# Compose's `secrets:` construct reads the referenced file's *content* as
# part of its own config model and applies the same interpolation warning
# to it (confirmed: it still warned on "$BRjTx3tlmSpz" even after that
# value was fully removed from every ${VAR} and --env-file path). A plain
# bind mount never touches the file's content, only its path, so it's
# immune to this entirely.
#
# The remaining supplier keys below are still passed the old ${VAR} way and
# remain exposed to the same class of bug — nothing consumes them yet
# (bookstore-core is still a stub for those), so when that code is written
# it should read `_FILE` variants the same way HARDCOVER_API_TOKEN and (as
# of Week 3) HELCIM_API_TOKEN now do below.
x-bookstore-env: &bookstore-env
  WORDPRESS_DB_HOST: db
  WORDPRESS_DB_NAME: ${DB_NAME}
  WORDPRESS_DB_USER: ${DB_USER}
  WORDPRESS_DB_PASSWORD_FILE: /run/secrets/db_password
  WORDPRESS_TABLE_PREFIX: ${WP_TABLE_PREFIX:-wp_}
  MAIL_CATCHER_HOST: mailhog
  MAIL_CATCHER_PORT: 1025
  WORDPRESS_CONFIG_EXTRA: |
    define('DISABLE_WP_CRON', true);
    define('WP_REDIS_HOST', 'redis');
    define('WP_MEMORY_LIMIT', '256M');
  # Passed through for the bookstore-core plugin's supplier adapters /
  # payment integration (design doc §04/§05) — not read by WordPress core.
  ACTIVE_SUPPLIER_ADAPTERS: ${ACTIVE_SUPPLIER_ADAPTERS:-gutenberg_test}
  BOOKSRUN_API_KEY: ${BOOKSRUN_API_KEY:-}
  INGRAM_API_KEY: ${INGRAM_API_KEY:-}
  INGRAM_ACCOUNT_ID: ${INGRAM_ACCOUNT_ID:-}
  HELCIM_ACCOUNT_ID: ${HELCIM_ACCOUNT_ID:-}
  MAILERLITE_API_KEY: ${MAILERLITE_API_KEY:-}
  HARDCOVER_API_TOKEN_FILE: /run/secrets/hardcover_api_token
  HELCIM_API_TOKEN_FILE: /run/secrets/helcim_api_token

services:
  db:
    image: mariadb:11
    restart: unless-stopped
    environment:
      MARIADB_DATABASE: ${DB_NAME}
      MARIADB_USER: ${DB_USER}
      MARIADB_PASSWORD_FILE: /run/secrets/db_password
      MARIADB_ROOT_PASSWORD_FILE: /run/secrets/db_root_password
    volumes:
      - db_data:/var/lib/mysql
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/db_password:/run/secrets/db_password:ro
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/db_root_password:/run/secrets/db_root_password:ro
    healthcheck:
      test: ["CMD-SHELL", "mariadb-admin ping -h 127.0.0.1 -u$$MARIADB_USER -p\"$$(cat /run/secrets/db_password)\" --silent"]
      interval: 5s
      timeout: 5s
      retries: 20

  redis:
    image: redis:7-alpine
    restart: unless-stopped
    volumes:
      - redis_data:/data
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 5s
      timeout: 3s
      retries: 20

  wordpress:
    build:
      context: ./docker/php
    restart: unless-stopped
    depends_on:
      db:
        condition: service_healthy
      redis:
        condition: service_healthy
    environment: *bookstore-env
    volumes:
      - wp_core:/var/www/html
      - wp_uploads:/var/www/html/wp-content/uploads
      - wp_themes:/var/www/html/wp-content/themes
      - ./wp-content/plugins/bookstore-core:/var/www/html/wp-content/plugins/bookstore-core
      - ./wp-content/mu-plugins:/var/www/html/wp-content/mu-plugins
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/db_password:/run/secrets/db_password:ro
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/hardcover_api_token:/run/secrets/hardcover_api_token:ro
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/helcim_api_token:/run/secrets/helcim_api_token:ro
    healthcheck:
      # No HTTP endpoint to hit directly — php-fpm speaks FastCGI on 9000,
      # not HTTP, and this image has no `nc`. bash's /dev/tcp redirection
      # needs no extra binary and is enough to know php-fpm is actually
      # accepting connections (verified directly: exits 0 once php-fpm is up,
      # 1 against a closed port). Without this, cron/caddy's depends_on only
      # waited for the container to *start*, not for php-fpm inside it to be
      # ready — a slow first boot (official image copying core files in, could
      # be worse on modest hardware) could let Caddy serve a transient 502
      # before php-fpm was actually listening.
      #
      # cron and caddy now gate on this via depends_on: condition:
      # service_healthy, which makes `docker compose up -d` (and so
      # deploy.sh, under set -euo pipefail) hard-fail if wordpress never
      # reports healthy in time — a new way for a deploy to fail that didn't
      # exist before this healthcheck did. Budgeted generously (~4.5 min:
      # start_period + retries*interval) for the 2-core/8GB box this
      # actually runs on: deploy.sh's own wp-settings.php wait loop already
      # budgets up to 120s just for the image's core-file copy step (chosen
      # for this same hardware), and this check additionally waits for
      # php-fpm itself to start, plus whatever `--build` is competing for on
      # a 2-core box. A too-tight budget here would turn "slow but fine" into
      # a spurious deploy failure, not just a slower one.
      test: ["CMD-SHELL", "bash -c '(exec 3<>/dev/tcp/127.0.0.1/9000)' 2>/dev/null"]
      interval: 5s
      timeout: 3s
      retries: 40
      start_period: 60s

  cron:
    build:
      context: ./docker/php
    restart: unless-stopped
    # Safe here (unlike wordpress's own service): this is a plain shell loop,
    # not php-fpm's master process, which needs to start as root so it can
    # drop privileges to its www-data workers itself. Missed in the earlier
    # root-hardening pass — found via a real bug: this container writing
    # wp-cron-triggered uploads as root, silently blocking www-data-run
    # wp-cli commands from writing new files into those same directories.
    user: www-data
    depends_on:
      wordpress:
        condition: service_healthy
    entrypoint: ["/bin/sh", "/usr/local/bin/cron-entrypoint.sh"]
    environment: *bookstore-env
    volumes:
      - wp_core:/var/www/html
      - wp_uploads:/var/www/html/wp-content/uploads
      - wp_themes:/var/www/html/wp-content/themes
      - ./wp-content/plugins/bookstore-core:/var/www/html/wp-content/plugins/bookstore-core
      - ./wp-content/mu-plugins:/var/www/html/wp-content/mu-plugins
      - ./docker/cron/entrypoint.sh:/usr/local/bin/cron-entrypoint.sh:ro
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/db_password:/run/secrets/db_password:ro
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/hardcover_api_token:/run/secrets/hardcover_api_token:ro
      - ./secrets/${ENVIRONMENT:?ENVIRONMENT must be set}/helcim_api_token:/run/secrets/helcim_api_token:ro

volumes:
  db_data:
  redis_data:
  wp_core:
  wp_uploads:
  wp_themes: