Sample Dockerfile doesn't work

[michelleran]

Steps to reproduce

1. Clone https://github.com/wmnnd/elixir-docker-guide
2. Copy the Dockerfile from https://hexdocs.pm/distillery/guides/working_with_docker.html
3. Set SKIP_PHOENIX to true
4. Add APP_NAME and APP_VSN parameters
5. Run docker build -t APP_NAME_HERE .

This produces the error (Mix) The task "distillery.release" could not be found, so:

6. Change the command to mix release (the --verbose flag is apparently not supported)
7. Run docker build -t APP_NAME_HERE . This produces the following error:

** (Mix.Releases.Config.LoadError) could not load release config rel/config.exs
    ** (UndefinedFunctionError) function Mix.Config.Agent.start_link/0 is undefined (module Mix.Config.Agent is not available)
    Mix.Config.Agent.start_link()
    (stdlib) erl_eval.erl:677: :erl_eval.do_apply/6
    (stdlib) erl_eval.erl:446: :erl_eval.expr/5
    (stdlib) erl_eval.erl:126: :erl_eval.exprs/5
    (elixir) lib/code.ex:232: Code.eval_string/3
    (distillery) lib/mix/lib/releases/config/config.ex:281: Mix.Releases.Config.read_string!/1
    (distillery) lib/mix/lib/releases/config/config.ex:302: Mix.Releases.Config.read!/1

8. Change the Elixir version from 1.7.2 to 1.9 (also update mix.exs to use the latest version of Distillery) and build again. mix release executes successfully, after which the following error is produced:

cp: can't stat '_build/prod/rel/APP_NAME_HERE/releases/0.1.0/APP_NAME_HERE.gz': No such file or directory

Description of issue

• What are the expected results?
  A successful build. It seems like the issue is that Distillery generates a .rel file, not a .tar.gz file.
• What version of Distillery?
  1.5.2 before step 8 -> 2.1.1
• What OS, Erlang/Elixir versions are you seeing this issue on?
  OS X 10.15.1, Elixir 1.5 before step 8 -> 1.9
• If possible, also provide your rel/config.exs, as it is often
  my first troubleshooting question, and you'll save us both time :)
  Unchanged from the default config file:

use Mix.Releases.Config,
    default_release: :default,
    default_environment: Mix.env()

environment :prod do
  set include_erts: true
  set include_src: false
  set cookie: :"WQqW]YPYmjsoNxBuzQ`koW2${8Pv~m{w>nH42hT>QqR~cE=qYdA@:0{RVr/i`@>W"
end

release :clock do
  set version: current_version(:clock)
  set applications: [
    :runtime_tools
  ]
end

• Is there documentation that says one thing, but Distillery does
  another? If so, please link the doc here so it can be updated if
  it's a documentation issue, or so that the fix can be based around
  what's documented.
  https://hexdocs.pm/distillery/guides/working_with_docker.html
• If this is a runtime configuration issue, please also provide your config file
  (with any sensitive information stripped of course). This is almost
  always necessary to understand why some configuration may not be working.

If you do not provide the above information and I need it to help troubleshoot, it may delay things significantly,
as I will have to ask you for all of these things anyway. Help me help you!

[michelleran]

Whoops, two things:

1. Mixed up Distillery and Elixir 1.9's built-in release tools
2. Used the wrong app name when building with Docker

It works now!