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Fully-loaded, pure-Elixir GraphQL server implementation with developer tools

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graphqexl lib mix tasks docker publish.ex
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lib/mix/tasks/docker/publish.ex 

defmodule Mix.Tasks.Docker.Publish do

  @shortdoc """

  Publish the built application container to the given image repo

  """



  def run([image_name, image_repo, image_tag]) do

    tag = image_tag || "#{git_sha}-dev"

    IO.puts "[STARTING] Publishing #{image_repo}/#{image_name}:#{tag}..."



    remote = docker_image(image_repo, image_name, tag)

    image_name

    |> docker_tag(remote)

    |> cmd_and(remote |> docker_push)



    IO.puts "[DONE] Publishing Docker image..."

  end



  defp cmd_and(cmd1, cmd2) do

    system_run(cmd1) && system_run(cmd2)

  end



  defp docker_image(name, repo, tag) do

    "#{repo}/#{name}:#{tag}"

  end



  defp local(image_name) do

    docker_image(image_name, "local-registry", "latest")

  end



  defp docker_push(remote) do

    IO.puts("[...] Pushing #{remote}")

    {"docker", ["push", remote]}

  end



  defp docker_tag(image_name, remote) do

    IO.puts("[...] Tagging #{remote}")

    {"docker", ["tag", local(image_name), remote]}

  end



  defp git_sha do

    {sha, status} = System.cmd("git", ["rev-parse", "--short=7", "HEAD"])

    sha |> String.trim

  end



  defp system_run({cmd, args}) do

    System.cmd(cmd, args, into: IO.stream(:stdio, :line))

  end

end