pkg_deb

defmodule PkgDeb.Format.Generators.Systemd do
  @moduledoc """
  This module produces a systemd unit file from the config and a template.
  """
  alias PkgDeb.Format.Generators.TemplateFinder

  def build(data_dir, config) do
    # debug "Building Systemd Service File"

    systemd_script =
      ["init_scripts", "systemd.service.eex"]
      |> TemplateFinder.retrieve()
      |> EEx.eval_file(
        description: config.description,
        name: config.name,
        base_path: config.base_path,
        uid: config.owner[:user],
        gid: config.owner[:group]
      )

    out_dir =
      [data_dir, "lib", "systemd", "system"]
      |> Path.join()

    :ok = File.mkdir_p(out_dir)

    :ok =
      [out_dir, config.sanitized_name <> ".service"]
      |> Path.join()
      |> File.write(systemd_script)
  end
end