content: # Build app
  # Deploy using Alpine
  
  ARG BASE_OS=alpine
  
  # Specify versions of Erlang, Elixir, and base OS.
  # Choose a combination supported by https://hub.docker.com/r/hexpm/elixir/tags
  
  ARG ELIXIR_VER=1.15.7
  ARG OTP_VER=26.1.2
  
  # https://hub.docker.com/_/alpine
  ARG BUILD_OS_VER=3.17.5
  ARG PROD_OS_VER=3.17.5
  
  # By default, packages come from the APK index for the base Alpine image.
  # Package versions are consistent between builds, and we normally upgrade by
  # upgrading the Alpine version.
  ARG APK_UPDATE=":"
  ARG APK_UPGRADE=":"
  
  # If a vulnerability is fixed in packages but not yet released in an Alpine
  # base image, then we can run update/upgrade as part of the build.
  # ARG APK_UPDATE="apk update"
  # ARG APK_UPGRADE="apk upgrade --update-cache -a"
  
  # Docker registry for internal images, e.g. 123.dkr.ecr.ap-northeast-1.amazonaws.com/
  # If blank, docker.io will be used. If specified, should have a trailing slash.
  ARG REGISTRY=""
  # Registry for public images such as debian, alpine, or postgres.
  ARG PUBLIC_REGISTRY=""
  # Public images may be mirrored into the private registry, with e.g. Skopeo
  # ARG PUBLIC_REGISTRY=$REGISTRY
  
  # Base image for build and test
  ARG BUILD_BASE_IMAGE_NAME=${PUBLIC_REGISTRY}hexpm/elixir
  ARG BUILD_BASE_IMAGE_TAG=${ELIXIR_VER}-erlang-${OTP_VER}-${BASE_OS}-${BUILD_OS_VER}
  
  # Base for final prod image
  ARG PROD_BASE_IMAGE_NAME=${PUBLIC_REGISTRY}${BASE_OS}
  ARG PROD_BASE_IMAGE_TAG=$PROD_OS_VER
  
  # App name, used to name directories
  ARG APP_NAME=app
  
  # Dir where app is installed
  ARG APP_DIR=/app
  
  # OS user for app to run under
  # nonroot:x:65532:65532:nonroot:/home/nonroot:/usr/sbin/nologin
  # nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
  ARG APP_USER=nonroot
  # OS group that app runs under
  ARG APP_GROUP=$APP_USER
  # OS numeric user and group id
  ARG APP_USER_ID=65532
  ARG APP_GROUP_ID=$APP_USER_ID
  
  ARG LANG=C.UTF-8
  
  # Elixir release env to build
  ARG MIX_ENV=prod
  
  # Name of Elixir release
  # This should match mix.exs releases()
  ARG RELEASE=prod
  
  # App listen port
  ARG APP_PORT=4000
  
  # Allow additional packages to be injected into builds
  ARG RUNTIME_PACKAGES=""
  ARG DEV_PACKAGES=""
  
  # Create build base image with OS dependencies
  FROM ${BUILD_BASE_IMAGE_NAME}:${BUILD_BASE_IMAGE_TAG} AS build-os-deps
      ARG APK_UPDATE
      ARG APK_UPGRADE
  
      ARG APP_DIR
      ARG APP_GROUP
      ARG APP_GROUP_ID
      ARG APP_USER
      ARG APP_USER_ID
  
      # Create OS user and group to run app under
      # https://wiki.alpinelinux.org/wiki/Setting_up_a_new_user#adduser
      RUN if ! grep -q "$APP_USER" /etc/passwd; \
          then addgroup -g "$APP_GROUP_ID" -S "$APP_GROUP" && \
          adduser -u "$APP_USER_ID" -S "$APP_USER" -G "$APP_GROUP" -h "$APP_DIR"; fi
  
      # Install tools and libraries to build binary libraries
      # Not necessary for a minimal Phoenix app, but likely needed
      # See https://wiki.alpinelinux.org/wiki/Local_APK_cache for details
      # on the local cache and need for the symlink
      RUN --mount=type=cache,id=apk,target=/var/cache/apk,sharing=locked \
          set -exu && \
          ln -s /var/cache/apk /etc/apk/cache && \
          $APK_UPDATE && $APK_UPGRADE && \
          apk add --no-progress nodejs npm && \
          # Get private repos
          apk add --no-progress openssh && \
          # Build binary libraries
          # apk add --no-progress alpine-sdk && \
          apk add --no-progress git build-base
  
      # Database command line clients to check if DBs are up when performing integration tests
      # RUN apk add --no-progress postgresql-client mysql-client
      # RUN apk add --no-progress --no-cache curl gnupg --virtual .build-dependencies -- && \
      #     curl -O https://download.microsoft.com/download/e/4/e/e4e67866-dffd-428c-aac7-8d28ddafb39b/msodbcsql17_17.5.2.1-1_amd64.apk && \
      #     curl -O https://download.microsoft.com/download/e/4/e/e4e67866-dffd-428c-aac7-8d28ddafb39b/mssql-tools_17.5.2.1-1_amd64.apk && \
      #     echo y | apk add --allow-untrusted msodbcsql17_17.5.2.1-1_amd64.apk mssql-tools_17.5.2.1-1_amd64.apk && \
      #     apk del .build-dependencies && rm -f msodbcsql*.sig mssql-tools*.apk
      # ENV PATH="/opt/mssql-tools/bin:${PATH}"
  
  # Get Elixir deps
  FROM build-os-deps AS build-deps-get
      ARG APP_DIR
      ENV HOME=$APP_DIR
  
      WORKDIR $APP_DIR
  
      # Copy only the minimum files needed for deps, improving caching
      COPY --link config ./config
      COPY --link mix.exs .
      COPY --link mix.lock .
  
      # COPY --link .env.default ./
  
      RUN mix 'do' local.rebar --force, local.hex --force
  
      # Add private repo for Oban
      RUN --mount=type=secret,id=oban_license_key \
          --mount=type=secret,id=oban_key_fingerprint \
          if test -s /run/secrets/oban_license_key; then \
              mix hex.repo add oban https://getoban.pro/repo \
                  --fetch-public-key "$(cat /run/secrets/oban_key_fingerprint)" \
                  --auth-key "$(cat /run/secrets/oban_license_key)"; \
          fi
  
      # Run deps.get with optional authentication to access private repos
      RUN --mount=type=ssh \
          --mount=type=secret,id=access_token \
          # Access private repos using ssh identity
          # https://docs.docker.com/engine/reference/commandline/buildx_build/#ssh
          # https://stackoverflow.com/questions/73263731/dockerfile-run-mount-type-ssh-doesnt-seem-to-work
          # Copying a predefined known_hosts file would be more secure, but would need to be maintained
          if test -n "$SSH_AUTH_SOCK"; then \
              mkdir -p /etc/ssh && \
              ssh-keyscan github.com > /etc/ssh/ssh_known_hosts && \
              mix deps.get; \
          # Access private repos using access token
          elif test -s /run/secrets/access_token; then \
              GIT_ASKPASS=/run/secrets/access_token mix deps.get; \
          else \
              mix deps.get; \
          fi
  
  # Create base image for tests
  FROM build-deps-get AS test-image
      ARG APP_DIR
  
      ENV MIX_ENV=test
  
      WORKDIR $APP_DIR
  
      # COPY --link .env.test ./
  
      # Compile deps separately from app, improving Docker caching
      RUN mix deps.compile
  
      RUN mix esbuild.install --if-missing
  
      RUN mix dialyzer --plt
  
      # Use glob pattern to deal with files which may not exist
      # Must have at least one existing file
      COPY --link .formatter.exs coveralls.jso[n] .credo.ex[s] dialyzer-ignor[e] trivy.yam[l] ./
  
      # Non-umbrella
      COPY --link lib ./lib
      COPY --link priv ./priv
      COPY --link test ./test
      # COPY --link bin ./bin
  
      # Umbrella
      # COPY --link apps ./apps
      # COPY --link priv ./priv
  
      # RUN set -a && . ./.env.test && set +a && \
      #     env && \
      #     mix compile --warnings-as-errors
  
      RUN mix compile --warnings-as-errors
  
      # For umbrella, using `mix cmd` ensures each app is compiled in
      # isolation https://github.com/elixir-lang/elixir/issues/9407
      # RUN mix cmd mix compile --warnings-as-errors
  
      # Add test libraries
      # RUN yarn global add newman
      # RUN yarn global add newman-reporter-junitfull
  
      # COPY --link Postman ./Postman
  
  # Create Elixir release
  FROM build-deps-get AS prod-release
      ARG APP_DIR
      ARG RELEASE
      ARG MIX_ENV=prod
  
      WORKDIR $APP_DIR
  
      # COPY --link .env.prod .
  
      # Compile deps separately from application for better caching.
      # Doing "mix 'do' compile, assets.deploy" in a single stage is worse
      # because a single line of code changed causes a complete recompile.
  
      # RUN set -a && . ./.env.prod && set +a && \
      #     env && \
      #     mix deps.compile
  
      RUN mix deps.compile
  
      RUN mix esbuild.install --if-missing
  
      # Install JavaScript deps using yarn
      # COPY --link assets/package.jso[n] assets/package.json
      # COPY --link assets/package-lock.jso[n] assets/package-lock.json
      # COPY --link assets/yarn.loc[k] assets/yarn.lock
      # RUN yarn --cwd ./assets install --prod
      # # RUN cd assets && yarn install --prod
  
      # Install JavaScript deps using npm
      # WORKDIR "${APP_DIR}/assets"
      # COPY --link assets/package.jso[n] ./
      # COPY --link assets/package-lock.jso[n] ./
      # RUN npm install
  
      # Compile assets the old way
      # WORKDIR "${APP_DIR}/assets"
      #
      # COPY --link assets/package.json ./
      # COPY --link assets/package-lock.json ./
      #
      # RUN --mount=type=cache,target=~/.npm,sharing=locked \
      #     npm --prefer-offline --no-audit --progress=false --loglevel=error ci
      #
      # COPY --link assets ./
      #
      # RUN --mount=type=cache,target=~/.npm,sharing=locked \
      #     npm run deploy
      #
      # Generate assets the really old way
      # RUN --mount=type=cache,target=~/.npm,sharing=locked \
      #     npm install && \
      #     node node_modules/webpack/bin/webpack.js --mode production
  
      WORKDIR $APP_DIR
  
      # Compile assets with esbuild
      COPY --link assets ./assets
      COPY --link priv ./priv
  
      # Non-umbrella
      COPY --link lib ./lib
  
      # Umbrella
      # COPY --link apps ./apps
  
      RUN mix assets.deploy
      # RUN esbuild default --minify
      # RUN mix phx.digest
  
      # For umbrella, using `mix cmd` ensures each app is compiled in
      # isolation https://github.com/elixir-lang/elixir/issues/9407
      # RUN mix cmd mix compile --warnings-as-errors
  
      # RUN set -a && . ./.env.prod && set +a && \
      #     env && \
      #     mix compile --verbose --warnings-as-errors
  
      RUN mix compile --warnings-as-errors
  
      # Build release
      COPY --link rel ./rel
      RUN mix release "$RELEASE"
  
  
  # Create base image for prod with everything but the code release
  FROM ${PROD_BASE_IMAGE_NAME}:${PROD_BASE_IMAGE_TAG} AS prod-base
      ARG APK_UPDATE
      ARG APK_UPGRADE
      ARG RUNTIME_PACKAGES
  
      ARG LANG
  
      ARG APP_DIR
      ARG APP_GROUP
      ARG APP_GROUP_ID
      ARG APP_NAME
      ARG APP_USER
      ARG APP_USER_ID
  
      # Create OS user and group to run app under
      # https://wiki.alpinelinux.org/wiki/Setting_up_a_new_user#adduser
      RUN if ! grep -q "$APP_USER" /etc/passwd; \
          then addgroup -g $APP_GROUP_ID -S "$APP_GROUP" && \
          adduser -u $APP_USER_ID -S "$APP_USER" -G "$APP_GROUP" -h "$APP_DIR"; fi
  
      # Install Alpine libraries needed at runtime
      # See https://wiki.alpinelinux.org/wiki/Local_APK_cache for details
      # on the local cache and need for the symlink
      RUN --mount=type=cache,id=apk,target=/var/cache/apk,sharing=locked \
          set -ex && \
          ln -s /var/cache/apk /etc/apk/cache && \
          # Upgrading ensures that we get the latest packages, but makes the build nondeterministic
          $APK_UPDATE && $APK_UPGRADE && \
          # apk add --no-progress $RUNTIME_PACKAGES && \
          # apk add --no-progress shared-mime-info tzdata && \
          # https://github.com/krallin/tini
          # apk add --no-progress tini && \
          # Make DNS resolution more reliable
          # https://github.com/sourcegraph/godockerize/commit/5cf4e6d81720f2551e6a7b2b18c63d1460bbbe4e
          # apk add --no-progress bind-tools && \
          # Support outbound TLS connections
          apk add --no-progress ca-certificates && \
          # Allow app to listen on HTTPS
          # May not be needed if HTTPS is handled outside the application, e.g. in load balancer
          apk add --no-progress openssl && \
          # Erlang deps
          apk add --no-progress ncurses-libs libgcc libstdc++
  
  
  # Create final prod image which gets deployed
  FROM prod-base AS prod
      ARG LANG
  
      ARG APP_DIR
      ARG APP_NAME
      ARG APP_USER
      ARG APP_GROUP
      ARG APP_PORT
  
      ARG MIX_ENV
      ARG RELEASE
  
      # Set environment vars that do not change. Secrets like SECRET_KEY_BASE and
      # environment-specific config such as DATABASE_URL should be set at runtime.
      ENV HOME=$APP_DIR \
          LANG=$LANG \
          PORT=$APP_PORT \
          PHX_SERVER=true \
          RELEASE=$RELEASE \
          MIX_ENV=$MIX_ENV \
          # Writable tmp directory for releases
          RELEASE_TMP="/run/${APP_NAME}"
  
      # The app needs to be able to write to a tmp directory on startup, which by
      # default is under the release. This can be changed by setting RELEASE_TMP to
      # /tmp or, more securely, /run/foo
      RUN \
          # Create app dirs
          mkdir -p "/run/${APP_NAME}" && \
          # Make dirs writable by app
          chown -R "${APP_USER}:${APP_GROUP}" \
              # Needed for RELEASE_TMP
              "/run/${APP_NAME}"
  
      # USER $APP_USER
  
      # Setting WORKDIR after USER makes directory be owned by the user.
      # Setting it before makes it owned by root, which is more secure.
      WORKDIR $APP_DIR
  
      # When using a startup script, copy to /app/bin
      # COPY --link bin ./bin
  
      USER $APP_USER:$APP_GROUP
  
      # Chown files while copying. Running "RUN chown -R app:app /app"
      # adds an extra layer which is about 10Mb, a huge difference if the
      # app image is around 20Mb.
  
      # TODO: For more security, change specific files to have group read/execute
      # permissions while leaving them owned by root
  
      # When using a startup script, unpack release under "/app/current" dir
      # WORKDIR $APP_DIR/current
  
      COPY --from=prod-release --chown="$APP_USER:$APP_GROUP" "/app/_build/${MIX_ENV}/rel/${RELEASE}" ./
  
      EXPOSE $APP_PORT
  
      # "bin" is the directory under the unpacked release, and "prod" is the name
      # of the release top level script, which should match the RELEASE var.
      # ENTRYPOINT ["bin/prod"]
  
      # Run under init to avoid zombie processes
      # https://github.com/krallin/tini
      # ENTRYPOINT ["/sbin/tini", "--", "bin/prod"]
  
      # Wrapper script which runs e.g. migrations before starting
      ENTRYPOINT ["bin/start-docker"]
  
      # Run app in foreground
      # CMD ["start"]
  
  
  # Copy build artifacts to host
  FROM scratch AS artifacts
      ARG MIX_ENV
      ARG RELEASE
  
      # COPY --from=prod-release "/app/_build/${MIX_ENV}/rel/${RELEASE}" /release
      COPY --from=prod-release /app/priv/static /static
  
  # Default target
  FROM prod
  