ci.yaml

name: Continuous integration
on:
  push:
    branches: ["*"]
    tags: ["v*"]
  pull_request:
    branches: ["develop"]

jobs:
  test:
    # runs-on: ubuntu-latest
    runs-on: ubuntu-20.04

    services:
      postgres:
        image: postgres
        env:
          POSTGRES_PASSWORD: postgres
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 5432:5432
      rabbitmq:
        image: rabbitmq:3.8
        env:
          RABBITMQ_DEFAULT_USER: guest
          RABBITMQ_DEFAULT_PASS: guest
        ports:
          - 5672:5672

    strategy:
      matrix:
        include:
          # # Drop old builds for now while fixing the new ones
          # # This is what docker builds.
          # - elixir-version: "1.9"
          #   otp-version: "21"
          # Current (at time of writing) versions.
          - elixir-version: "1.17"
            otp-version: "27"

    steps:
      - uses: actions/checkout@v4
      - uses: erlef/setup-beam@v1
        id: beam
        with:
          elixir-version: ${{ matrix.elixir-version }}
          otp-version: ${{ matrix.otp-version }}

      - name: Fetch deps
        run: |
          mix deps.get

      - name: Compile prometheus_process_collector
        run: |
          # The prometheus_process_collector's makefile doesn't work properly
          # for new OTP, so we set the variables it needs in a way that works.
          export ERTS_INCLUDE_DIR=$(erl -noshell -eval "io:format(\"~s/erts-~s/include/\", [code:root_dir(), erlang:system_info(version)])." -s init stop)
          export ERL_INTERFACE_INCLUDE_DIR=$(erl -noshell -eval "io:format(\"~s\", [code:lib_dir(erl_interface, include)])." -s init stop)
          export ERL_INTERFACE_LIB_DIR=$(erl -noshell -eval "io:format(\"~s\", [code:lib_dir(erl_interface, lib)])." -s init stop)
          MIX_ENV=test mix deps.compile prometheus_process_collector

      - name: Run tests
        run: |
          # This is basically `mix test` with coverage enabled.
          mix coveralls.json

      - name: Lints
        # Let the build succeed for now even if the lints fail.
        continue-on-error: true
        run: |
          mix format --check-formatted
          # This will mention FIXME and TODO comments without failing, any
          # other issue fails the build.
          mix credo