ci.exs

Mix.install([
  {:dagger, "~> 0.9.4"}
])

defmodule Ci do
  alias Dagger.{Client, Container, Directory, Host}

  @workdir "/app"
  # TODO: change to your release name.
  @release "hello_world_dagger"

  def run do
    client = Dagger.connect!()

    project =
      client
      |> Client.host()
      |> Host.directory(".")

    builder =
      client
      |> Client.container()
      |> Container.from("hexpm/elixir:1.15.7-erlang-26.2.1-debian-bookworm-20231009-slim")
      |> Container.with_workdir(@workdir)
      |> Container.with_exec(~w"apt update -y")
      |> Container.with_exec(~w"apt install -y build-essential git wget")
      |> Container.with_directory("config", Directory.directory(project, "/config"))
      |> Container.with_file("mix.exs", Directory.file(project, "mix.exs"))
      |> Container.with_file("mix.lock", Directory.file(project, "mix.lock"))
      |> Container.with_exec(~w"mix local.rebar --force")
      |> Container.with_exec(~w"mix local.hex --force")
      |> Container.with_exec(~w"mix deps.get")
      |> Container.with_env_variable("MIX_ENV", "prod")
      |> Container.with_directory(
        "assets",
        Directory.directory(project, "/assets")
      )
      |> Container.with_directory(
        "priv",
        Directory.directory(project, "/priv")
      )
      |> Container.with_directory(
        "lib",
        Directory.directory(project, "/lib")
      )
      |> Container.with_exec(~w"mix assets.deploy")
      |> Container.with_exec(~w"mix compile")
      |> Container.with_directory("rel", Directory.directory(project, "."))
      |> Container.with_exec(~w"mix release")

    prod =
      client
      |> Client.container()
      |> Container.from("debian:bookworm")
      |> Container.with_workdir("/#{@release}")
      |> Container.with_exec([
        "sh",
        "-c",
        "apt-get update -y && apt-get install -y libstdc++6 openssl libncurses5 locales && apt-get clean && rm -f /var/lib/apt/lists/*_*"
      ])
      |> Container.with_exec([
        "sh",
        "-c",
        "sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen"
      ])
      |> Container.with_env_variable("LANG", "en_US.UTF-8")
      |> Container.with_env_variable("LANGUAGE", "en_US.UTF-8")
      |> Container.with_env_variable("LC_ALL", "en_US.UTF-8")
      |> Container.with_directory(
        ".",
        Container.directory(builder, "_build/prod/rel/#{@release}")
      )
      |> Container.with_exposed_port(4000)
      |> Container.with_entrypoint(["bin/#{@release}", "start"])

    # Export image as tar to local system
    Container.export(prod, "./test.tar")

    Dagger.close(client)
  end
end

Ci.run()

dagger.test.ex

defmodule Mix.Tasks.Dagger.Test do
  # NOTE: Add `{:dagger, "~> 0.9"}` into mix.exs file. If found `:req` version conflict,
  # add `{:req, "~> 0.4", override: true}` could solve the issue.
  use Mix.Task

  alias Dagger.{Client, Container, Directory, Host}

  @workdir "/app"
  # TODO: change to your release name.
  @release "hello_world_dagger"

  def run(_args) do
    Application.ensure_all_started(:dagger)

    client = Dagger.connect!()

    project =
      client
      |> Client.host()
      |> Host.directory(".")

    builder =
      client
      |> Client.container()
      |> Container.from("hexpm/elixir:1.15.7-erlang-26.2.1-debian-bookworm-20231009-slim")
      |> Container.with_workdir(@workdir)
      |> Container.with_exec(~w"apt update -y")
      |> Container.with_exec(~w"apt install -y build-essential git wget")
      |> Container.with_directory("config", Directory.directory(project, "/config"))
      |> Container.with_file("mix.exs", Directory.file(project, "mix.exs"))
      |> Container.with_file("mix.lock", Directory.file(project, "mix.lock"))
      |> Container.with_exec(~w"mix local.rebar --force")
      |> Container.with_exec(~w"mix local.hex --force")
      |> Container.with_exec(~w"mix deps.get")
      |> Container.with_env_variable("MIX_ENV", "prod")
      |> Container.with_directory(
        "assets",
        Directory.directory(project, "/assets")
      )
      |> Container.with_directory(
        "priv",
        Directory.directory(project, "/priv")
      )
      |> Container.with_directory(
        "lib",
        Directory.directory(project, "/lib")
      )
      |> Container.with_exec(~w"mix assets.deploy")
      |> Container.with_exec(~w"mix compile")
      |> Container.with_directory("rel", Directory.directory(project, "."))
      |> Container.with_exec(~w"mix release")

    prod =
      client
      |> Client.container()
      |> Container.from("debian:bookworm")
      |> Container.with_workdir("/#{@release}")
      |> Container.with_exec([
        "sh",
        "-c",
        "apt-get update -y && apt-get install -y libstdc++6 openssl libncurses5 locales && apt-get clean && rm -f /var/lib/apt/lists/*_*"
      ])
      |> Container.with_exec([
        "sh",
        "-c",
        "sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen"
      ])
      |> Container.with_env_variable("LANG", "en_US.UTF-8")
      |> Container.with_env_variable("LANGUAGE", "en_US.UTF-8")
      |> Container.with_env_variable("LC_ALL", "en_US.UTF-8")
      |> Container.with_directory(
        ".",
        Container.directory(builder, "_build/prod/rel/#{@release}")
      )
      |> Container.with_exposed_port(4000)
      |> Container.with_entrypoint(["bin/#{@release}", "start"])

    # Export image as tar to local system
    Container.export(prod, "./test.tar")

    Dagger.close(client)
  end
end