Can't Start App as a Child App in an Umbrella

Questions / Help
,
1

My app works fine alone, however, if I tried to run it within an umbrella setup, I get an error:

here is what I did: (at the root of umbrella folder)

mix local.rebar
rm -rf deps
rm -rf _build
mix deps.get
iex -S mix phoenix.server

Erlang/OTP 20 [erts-9.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

===> Compiling pooler
===> Compiling src/pooler_starter.erl failed
src/pooler_starter.erl:34: export_all flag enabled - all functions will be exported

** (Mix) Could not compile dependency :pooler, "/Users/samir/.mix/rebar3 bare compile --paths "/Users/samir/Documents/projects/elixir/_build/dev/lib/*/ebin"" command failed. You can recompile this dependency with "mix deps.compile pooler", update it with "mix deps.update pooler" or clean it with "mix deps.clean pooler"

although I can start it if I run the commandiex -S mix phoenix.server at the app folder itself.

here is the mix.exs of the umbrella main app:

defmodule TrackwareProjects.Mixfile do
use Mix.Project
def project do
    [apps_path: "apps",
     build_embedded: Mix.env == :prod,
     start_permanent: Mix.env == :prod,
     deps: deps()]
  end
  defp deps do
    []
  end
end

the config.exs of the umbrella main app:

use Mix.Config
import_config "../apps/*/config/config.exs"

Any idea?

2

Is there something in your global configuration that treats warnings as errors? Perhaps some overrides in a .iex file, as it seems to work when you not use iex…

3

The sub-app can work independently, but not within the Umbrella, don’t have global configuration that treats warnings as errors…

4

Then please try to DEBUG=1 iex -S mix.phoenix.server, this should enforce rebar too give away more information…

Also I found a bug report that 1.5.2 of :pooler has problems with OTP 20: https://github.com/seth/pooler/issues/76

Perhaps your issue is related? Then I do wonder though, why it works in the sub app but not in the context of the umbrella.

Anyway, can you recreate a minimal project that recreates the issue?

5

using DEBUG=1 I got those errors:

✗ DEBUG=1 iex -S mix phoenix.server
Erlang/OTP 20 [erts-9.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

===> Expanded command sequence to be run: []
===> Expanded command sequence to be run: [{default,app_discovery},
                                           {bare,compile}]
===> Evaluating config script "/Users/samir/Documents/projects/elixir/deps/pooler/rebar.config.script"
===> Evaluating config script "/Users/samir/Documents/projects/elixir/deps/pooler/rebar.config.script"
===> Compiling pooler
===> run_hooks("/Users/samir/Documents/projects/elixir/deps/pooler", pre_hooks, compile) -> no hooks defined

===> run_hooks("/Users/samir/Documents/projects/elixir/deps/pooler", pre_hooks, erlc_compile) -> no hooks defined

===> erlopts [debug_info,
              {d,namespaced_types},
              debug_info,warnings_as_errors,inline]
===> files to compile ["/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_sup.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_starter_sup.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_starter.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_pooled_worker_sup.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_pool_sup.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_config.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler_app.erl",
                       "/Users/samir/Documents/projects/elixir/deps/pooler/src/pooler.erl"]
===>      Compiled pooler_sup.erl
===>      Compiled pooler_starter_sup.erl
===> Compiling src/pooler_starter.erl failed
src/pooler_starter.erl:34: export_all flag enabled - all functions will be exported

===> Compilation failed: {error,[],
                                [["src/pooler_starter.erl:34: export_all flag enabled - all functions will be exported\n"]]}
** (Mix) Could not compile dependency :pooler, "/Users/samir/.mix/rebar3 bare compile --paths "/Users/samir/Documents/projects/elixir/_build/dev/lib/*/ebin"" command failed. You can recompile this dependency with "mix deps.compile pooler", update it with "mix deps.update pooler" or clean it with "mix deps.clean pooler"
6

As you can see here, for some reason warnings are treated as errors here. Now we need to find out why this happens in the umbrella but not in the sub-app.

Can you compare the output (especially configscript- and preehook-pathes) when doing the same in the sub-app? Of course you need to mix clean pooler there first.

7

when I do:

$ cd apps/trackware
$ mix clean pooler
$ DEBUG=1 iex -S mix phoenix.server

the app starts normally without any issue, so what output to compare ?

8

The output of rebar3 building :pooler…

If there is no :pooler built in the application that you are in, then you are not in the sub-app that makes you a problem…