Error to use jchash as dependency in Elixir Docker slim image

[Vinicius Souza]

Hi, @cabol hope you're going well.

I'm using Nebulex with Redis Cluster as backend. I have as a requirement a small docker image size to deploy my application. But, when I use Elixir Docker Slim Image or Elixir Docker Alpine Image I receive an error when Mix tries to compile jchash:

** (Mix) Could not compile dependency :jchash, "/root/.mix/rebar3 bare compile --paths "/upa/_build/prod/lib/*/ebin"" command failed. You can recompile this dependency with "mix deps.compile jchash", update it with "mix deps.update jchash" or clean it with "mix deps.clean jchash"

Versions:

{:jchash, "0.1.1"}
Elixir: 1.8.2
Erlang: 22
{:nebulex, "~> 1.1"},
{:nebulex_redis_adapter, "~> 1.1"}

Can you help me to find which OS dependency I must to install to solve this?

[Carlos Andres Bolaños R.A.]

Sure, let me try to reproduce the error and see how we can fix it!

[Carlos Andres Bolaños R.A.]

After running several tests, in order to make it work, I had to provide my own Dockerfile:

FROM elixir:1.9-alpine

RUN apk update && \
  apk upgrade --no-cache && \
  apk add --no-cache \
    git \
    build-base && \
  mix local.rebar --force && \
  mix local.hex --force

CMD ["iex"]

I think you have to run/force (the trick is in these two commands):

mix local.rebar --force && \
mix local.hex --force

After that, it did work. To test it out I ran:

$ docker build -t myalpine .
$ docker run --rm -v $PWD:/myapp -w /app -it myalpine mix deps.compile
$ docker run --rm -v $PWD:/myapp -w /app -it myalpine mix compile

[Vinicius Souza]

@cabol Sorry for delay. Thank you!