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Build and Deploy Elixir releases to Kubernetes via Helm

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mandrag lib mix tasks mandrag.deploy.ex
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lib/mix/tasks/mandrag.deploy.ex 

defmodule Mix.Tasks.Mandrag.Deploy do

  use Mix.Task

  import Mandrag



  @shortdoc "Deploys an exrm release."



  def run(_) do

    # Silence output unless :debug

    if output_level < 2, do: System.put_env("MIX_QUIET", "true")

    initial_deploy? |> deploy

  end



  defp deploy(true) do

    message "Starting initial deploy."

    Mix.Task.run "mandrag.prepare"

    Mix.Task.run "mandrag.build"

    Mix.Task.run "mandrag.start"

  end



  defp deploy(false) do

    message "Starting deploy."

    Mix.Task.run "mandrag.build"

    if Code.ensure_loaded?(Ecto), do: update_db

    location |> rel_dir? |> upgrade

  end



  defp upgrade(true), do: Mix.Task.run "mandrag.upgrade.hot"

  defp upgrade(false), do: Mix.Task.run "mandrag.upgrade.cold"



  defp update_db do

    case location do

      :local -> Mix.Task.run "ecto.migrate", []

      :remote -> ssh "cd #{name} && MIX_ENV=#{Mix.env} mix ecto.migrate"

    end

  end



  defp initial_deploy?, do: ssh("ls #{name} &>/dev/null") != 0

  defp rel_dir?(:remote), do: ssh("ls #{name}/rel/* %>/dev/null") == 0

  defp rel_dir?(:local), do: Mix.Shell.IO.cmd("ls rel/* %>/dev/null") == 0

end