neiam /diogramos

# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
# instead of Alpine to avoid DNS resolution issues in production.
#
#   - https://hub.docker.com/r/hexpm/elixir/tags
#   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bookworm
#
# OTP 27.3.4.16, not 27.2. 27.2's TLS stack rejects the certificate chain
# behind builds.hex.pm with `key_usage_mismatch` — it refuses a chain cert
# carrying both keyUsage(keyCertSign,cRLSign) and extendedKeyUsage(serverAuth)
# — so `mix local.hex --force` cannot download Hex and the image build dies
# before any of this project's code is involved. muddle hit this first; both
# repos were pinned to the same image.
#
# Reproduced and fixed against the real images:
#   27.2       -> "Could not install Hex ... could not download metadata"
#   27.3.4.16  -> installs hex 2.5.1 and rebar3 cleanly
#
# The Debian date moves with it because 27.3.4.16 is not published against
# bookworm-20241223; that also bumps the runner, which is overdue anyway.
ARG ELIXIR_VERSION=1.17.3
ARG OTP_VERSION=27.3.4.16
ARG DEBIAN_VERSION=bookworm-20260803-slim

ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"

FROM ${BUILDER_IMAGE} as builder

# install build dependencies
RUN apt-get update -y && apt-get install -y build-essential git \
    && apt-get clean && rm -f /var/lib/apt/lists/*_*

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# set build ENV
ENV MIX_ENV="prod"

# install mix dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

COPY priv priv
COPY lib lib
COPY assets assets

# Tailwind + esbuild are managed via mix; no npm step needed.
RUN mix assets.deploy

# Compile the release
RUN mix compile

# Changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/

COPY rel rel
RUN mix release

# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE}

RUN apt-get update -y && \
  apt-get install -y libstdc++6 openssl libncurses6 locales ca-certificates tini \
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen

ENV LANG=en_US.UTF-8 \
    LANGUAGE=en_US:en \
    LC_ALL=en_US.UTF-8

WORKDIR "/app"
RUN chown nobody /app

# set runner ENV
ENV MIX_ENV="prod"

# Only copy the final release from the build stage
COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/diogramos ./

USER nobody

# tini reaps zombies + forwards signals so PostgreSQL connections get
# closed cleanly on SIGTERM.
ENTRYPOINT ["/usr/bin/tini", "--"]
CMD ["/app/bin/server"]