Create standalone executable that uses another executable

[Rod Schmidt]

I'm trying to create a standalone executable using mix escript.build. It seems to work, but when I run it. I get this:

** (EXIT from #PID<0.49.0>) an exception was raised:

    ** (ArgumentError) argument error

        :erlang.++({:error, :bad_name}, '/ale')

        lib/i2c.ex:59: I2c.init/1

        (stdlib) gen_server.erl:306: :gen_server.init_it/6

        (stdlib) proc_lib.erl:239: :proc_lib.init_p_do_apply/3

What its trying to do is run another executable called ale. This works fine when I do things from iex -S mix. The dependencies I'm using is called elxir_ale (http://github.com/fhunleth/elixir_ale). The executable (ale) is in the priv directory under the _build directory. I thought I read somewhere that mix is supposed to create a symlink to embedded executables like ale, but I don't see that being done. Here's my mix.ex:

defmodule ExGoPiGo.Mixfile do

  use Mix.Project

  def project do

    [app: :exgopigo,

     version: "0.0.1",

     name: "ExGoPiGo",

     source_url: "https://github.com/infinitenil/exgopigo",

     elixir: "~> 1.0",

     # build_embedded: Mix.env == :prod,

     # start_permanent: Mix.env == :prod,

     escript: escript_config,

     deps: deps]

  end

  # Configuration for the OTP application

  #

  # Type `mix help compile.app` for more information

  def application do

    [applications: [:logger, :elixir_ale]]

  end

  # Dependencies can be Hex packages:

  #

  #   {:mydep, "~> 0.3.0"}

  #

  # Or git/path repositories:

  #

  #   {:mydep, git: "https://github.com/elixir-lang/mydep.git", tag: "0.1.0"}

  #

  # Type `mix help deps` for more examples and options

  defp deps do

    [

      { :elixir_ale,  "~> 0.3.0" },

      { :ex_doc,      github: "elixir-lang/ex_doc" }

    ]

  end

  defp escript_config do

    [main_module: ExGoPiGo]

  end

end

Any thoughts on what I'm missing?

Thanks,

Rod

[José Valim]

escripts do not work when they need to read values from priv. I will update the docs to make it clear. Thanks for reporting.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Lead Developer

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[Jason M Barnes]

NIFs tend to place shared object libraries in priv/ so maybe a note that escripts will only work for pure Elixir/Erlang code would be helpful.

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