From 76d5fc9adf2c140f9d2bd7a4fd35676e5f56d34a Mon Sep 17 00:00:00 2001
From: Joao P Dubas <joao.dubas+gitea@gmail.com>
Date: Fri, 20 Sep 2024 21:16:32 +0000
Subject: [PATCH] feat: use release to deploy application

Adjust `Dockerfile` and `docker-compose` to use the `release` structure.
---
 Dockerfile                   | 72 +++++++++++++++++++++++++++++++++---
 docker-compose.yml           |  2 +
 lib/wabanex/release.ex       | 28 ++++++++++++++
 rel/overlays/bin/migrate     |  5 +++
 rel/overlays/bin/migrate.bat |  1 +
 rel/overlays/bin/server      |  5 +++
 rel/overlays/bin/server.bat  |  2 +
 7 files changed, 109 insertions(+), 6 deletions(-)
 create mode 100644 lib/wabanex/release.ex
 create mode 100755 rel/overlays/bin/migrate
 create mode 100755 rel/overlays/bin/migrate.bat
 create mode 100755 rel/overlays/bin/server
 create mode 100755 rel/overlays/bin/server.bat

diff --git a/Dockerfile b/Dockerfile
index f0578c2..0bb3f02 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,70 @@
-FROM hexpm/elixir:1.17.2-erlang-27.0.1-debian-bookworm-20240701-slim AS builder
+ARG ELIXIR_VERSION=1.17.2
+ARG OTP_VERSION=27.0.1
+ARG DEBIAN_VERSION=bookworm-20240701-slim
+ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
+ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
 
+FROM ${BUILDER_IMAGE} AS builder
 RUN apt-get update \
-  && apt-get -y install git make
-
+  && apt-get -y install \
+    build-essential \
+    git \
+    make \
+  && apt-get clean \
+  && rm -rf /var/lib/ap/lists/*_*
 WORKDIR /opt/app
+# install hex + rebar
+RUN mix do local.hex --force, local.rebar --force
+# set build ENV
+ARG BUILD_MIX_ENV=prod
+ENV MIX_ENV=${BUILD_MIX_ENV}
+# install mix dependencies
+COPY mix.exs mix.lock ./
+RUN mix deps.get --only ${MIX_ENV}
+RUN mkdir config
+# copy compile-time config files before we compile dependencies
+# to ensure any relevant config change will trigger the dependencies
+# to be re-compiled.
+COPY config/config.exs config/${BUILD_MIX_ENV}.exs config/
+RUN mix deps.compile
+COPY priv priv
+COPY lib lib
+# Compile the release
+RUN mix compile
+# Changes to config/runtime.exs don't require recompiling the code
+COPY config/runtime.exs config/
+COPY rel rel
+RUN mix release
 COPY ./mix.exs ./
-COPY ./mix.lock ./
-RUN mix do local.hex --force, local.rebar --force \
-  && mix do deps.get, deps.compile
+EXPOSE 4000
+ENTRYPOINT ["./priv/docker/service/docker-entrypoint.sh"]
+CMD ["sample-cookie"]
+
+# start a new build stage so that the final image will only contain
+# the compiled release and other runtime necessities
+FROM ${RUNNER_IMAGE}
+RUN apt-get update -y \
+  && apt-get install -y \
+    ca-certificates \
+    libncurses5 \
+    libstdc++6 \
+    locales \
+    openssl \
+    tini \
+  && apt-get clean && rm -f /var/lib/apt/lists/*_*
+# Set the locale
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+WORKDIR /opt/app
+RUN chown nobody /opt/app
+# set runner ENV
+ARG BUILD_MIX_ENV=prod
+ENV MIX_ENV=${BUILD_MIX_ENV}
+# Only copy the final release from the build stage
+COPY --from=builder --chown=nobody:root /app/_build/${BUILD_MIX_ENV}/rel/wabanex ./
+USER nobody
+EXPOSE 4000
+ENTRYPOINT ["tini", "--"]
+CMD ["/app/bin/server"]
diff --git a/docker-compose.yml b/docker-compose.yml
index 6474232..052ec9c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -17,6 +17,8 @@ services:
     build:
       target: builder
       context: .
+      args:
+        BUILD_MIX_ENV: dev
     hostname: app
     depends_on:
       - db
diff --git a/lib/wabanex/release.ex b/lib/wabanex/release.ex
new file mode 100644
index 0000000..10ba398
--- /dev/null
+++ b/lib/wabanex/release.ex
@@ -0,0 +1,28 @@
+defmodule Wabanex.Release do
+  @moduledoc """
+  Used for executing DB release tasks when run in production without Mix
+  installed.
+  """
+  @app :wabanex
+
+  def migrate do
+    load_app()
+
+    for repo <- repos() do
+      {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, all: true))
+    end
+  end
+
+  def rollback(repo, version) do
+    load_app()
+    {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))
+  end
+
+  defp repos do
+    Application.fetch_env!(@app, :ecto_repos)
+  end
+
+  defp load_app do
+    Application.load(@app)
+  end
+end
diff --git a/rel/overlays/bin/migrate b/rel/overlays/bin/migrate
new file mode 100755
index 0000000..1d0884e
--- /dev/null
+++ b/rel/overlays/bin/migrate
@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+cd -P -- "$(dirname -- "$0")"
+exec ./wabanex eval Wabanex.Release.migrate
diff --git a/rel/overlays/bin/migrate.bat b/rel/overlays/bin/migrate.bat
new file mode 100755
index 0000000..b065b42
--- /dev/null
+++ b/rel/overlays/bin/migrate.bat
@@ -0,0 +1 @@
+call "%~dp0\wabanex" eval Wabanex.Release.migrate
diff --git a/rel/overlays/bin/server b/rel/overlays/bin/server
new file mode 100755
index 0000000..36cba5a
--- /dev/null
+++ b/rel/overlays/bin/server
@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+cd -P -- "$(dirname -- "$0")"
+PHX_SERVER=true exec ./wabanex start
diff --git a/rel/overlays/bin/server.bat b/rel/overlays/bin/server.bat
new file mode 100755
index 0000000..5c38da8
--- /dev/null
+++ b/rel/overlays/bin/server.bat
@@ -0,0 +1,2 @@
+set PHX_SERVER=true
+call "%~dp0\wabanex" start