App with extra config files fails to deploy

I found two issues when I’m try to deploy my app to

The first is that fly expects me to have a config/prod.exs file which I don’t have. I created an empty prod.exs file there just so that error go away, but it would be nice if I could specify that I don’t want that file copied during the docker container creation.

The second one is that I have my configs separated into multiple files to make things easier to organize.

So, for example, I have a config/aws.exs file and in my config/config.exs I have the following line loading it: import_config "aws.exs".

fly seems to expect that I just use config/config.exs and config/prod.exs and will just copy these two files to the docker container. I think this is very problematic since it will fail as soon as someone changes how their config are handled.

Probably a better solition is to just copy the full config directory.

Here is the error I get when I try to deploy:

core [fix_credo_warnings]× » fly deploy                                               13:34:38
==> Verifying app config
Validating /var/home/sezdocs/projects/feedback_cupcake/core/fly.toml
✓ Configuration is valid
--> Verified app config
==> Building image
Remote builder fly-builder-rough-silence-291 ready
Remote builder fly-builder-rough-silence-291 ready
==> Building image with Docker
--> docker host: 24.0.7 linux x86_64
[+] Building 4.5s (19/28)                                                                     
 => [internal] load build definition from Dockerfile                                     0.7s
 => => transferring dockerfile: 2.82kB                                                   0.7s
 => [internal] load .dockerignore                                                        0.7s
 => => transferring context: 1.37kB                                                      0.7s
 => [internal] load metadata for         1.0s
 => [internal] load metadata for  1.1s
 => [builder  1/17] FROM  0.0s
 => [internal] load build context                                                        1.8s
 => => transferring context: 209.51kB                                                    1.8s
 => [stage-1 1/6] FROM  0.0s
 => CACHED [stage-1 2/6] RUN apt-get update -y &&   apt-get install -y libstdc++6 opens  0.0s
 => CACHED [stage-1 3/6] RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-g  0.0s
 => CACHED [stage-1 4/6] WORKDIR /app                                                    0.0s
 => CACHED [stage-1 5/6] RUN chown nobody /app                                           0.0s
 => CACHED [builder  2/17] RUN apt-get update -y && apt-get install -y build-essential   0.0s
 => CACHED [builder  3/17] WORKDIR /app                                                  0.0s
 => CACHED [builder  4/17] RUN mix local.hex --force &&     mix local.rebar --force      0.0s
 => CACHED [builder  5/17] COPY mix.exs mix.lock ./                                      0.0s
 => CACHED [builder  6/17] RUN mix deps.get --only prod                                  0.0s
 => CACHED [builder  7/17] RUN mkdir config                                              0.0s
 => [builder  8/17] COPY config/config.exs config/prod.exs config/                       0.0s
 => ERROR [builder  9/17] RUN mix deps.compile                                           0.7s
 > [builder  9/17] RUN mix deps.compile:
0.725 ["config", "deps", "mix.exs", "mix.lock"]
0.726 ["config.exs", "prod.exs"]
0.734 ** (File.Error) could not read file "/app/config/aws.exs": no such file or directory
0.734     (elixir 1.16.2) lib/file.ex:384:!/1
0.734     (elixir 1.16.2) lib/config.ex:275: Config.__import__!/1
0.734     /app/config/config.exs:6: (file)
0.734     (stdlib 5.2) erl_eval.erl:750: :erl_eval.do_apply/7
0.734     (stdlib 5.2) erl_eval.erl:136: :erl_eval.exprs/6
Error: failed to fetch an image or build from source: error building: failed to solve: process "/bin/sh -c mix deps.compile" did not complete successfully: exit code: 1

Ok, I didn’t noticed that fly launch actually creates a Dockerfile in my root project that I can edit… Changing it was the solution