name: Validate

# We use bash as default even in windows
# to try keep the workflow as uniform as possible
defaults:
  run:
    shell: bash

# See: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#concurrency.
concurrency:
  group: ${{ github.ref }}-${{ github.workflow }}
  cancel-in-progress: true

on:
  push:
    branches:
      - master
  pull_request:
  release:
    types:
      - created

env:
  # We choose a stable ghc version across all os's
  # which will be used to do the next release
  GHC_FOR_RELEASE: '9.2.3'
  # Ideally we should use the version about to be released for hackage tests and benchmarks
  GHC_FOR_SOLVER_BENCHMARKS: '9.2.3'
  GHC_FOR_COMPLETE_HACKAGE_TESTS: '9.2.3'
  COMMON_FLAGS: '-j 2 -v'

jobs:
  validate:
    name: Validate ${{ matrix.os }} ghc-${{ matrix.ghc }}
    runs-on: ${{ matrix.os }}
    outputs:
      GHC_FOR_RELEASE: ${{ format('["{0}"]', env.GHC_FOR_RELEASE) }}
    strategy:
      matrix:
        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
        ghc: ["9.2.3", "9.0.2", "8.10.7", "8.8.4", "8.6.5", "8.4.4"]
        exclude:
          # corrupts GHA cache or the fabric of reality itself, see https://github.com/haskell/cabal/issues/8356
          - os: "windows-latest"
            ghc: "8.10.7"
          # lot of segfaults caused by ghc bugs
          - os: "windows-latest"
            ghc: "8.8.4"
          - os: "windows-latest"
            ghc: "8.4.4"

    steps:

      - uses: actions/checkout@v2

      - uses: haskell/actions/setup@v1
        id: setup-haskell
        with:
          ghc-version: ${{ matrix.ghc }}
          cabal-version: latest # default, keeping for visibility

      #  See the following link for a breakdown of the following step
      #  https://github.com/haskell/actions/issues/7#issuecomment-745697160
      - uses: actions/cache@v2
        with:
          # validate.sh uses a special build dir
          path: |
            ${{ steps.setup-haskell.outputs.cabal-store }}
            dist-*
          key: ${{ runner.os }}-${{ matrix.ghc }}-20220419-${{ github.sha }}
          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-20220419-

      - name: Work around git problem https://bugs.launchpad.net/ubuntu/+source/git/+bug/1993586 (cabal PR #8546)
        run: |
          git config --global protocol.file.allow always

      # The '+exe' constraint below is important, otherwise cabal-install
      # might decide to build the library but not the executable which is
      # what we need.
      - name: Install cabal-plan
        run: |
          cd $(mktemp -d)
          cabal install cabal-plan --constraint='cabal-plan +exe'
          echo "$HOME/.cabal/bin" >> $GITHUB_PATH

      # The tool is not essential to the rest of the test suite. If
      # hackage-repo-tool is not present, any test that requires it will
      # be skipped.
      # We want to keep this in the loop but we don't want to fail if
      # hackage-repo-tool breaks or fails to support a newer GHC version.
      - name: Install hackage-repo-tool
        continue-on-error: true
        run: |
          cd $(mktemp -d)
          cabal install hackage-repo-tool

      # Needed by cabal-testsuite/PackageTests/Configure/setup.test.hs
      - name: Install Autotools
        if: runner.os == 'macOS'
        run: |
          brew install automake

      - name: Set validate inputs
        run: |
          FLAGS="${{ env.COMMON_FLAGS }}"
          if [[ "${{ matrix.cli }}" == "false" ]]; then
            FLAGS="$FLAGS --lib-only"
          fi
          if [[ ${{ matrix.ghc }} == ${{ env.GHC_FOR_SOLVER_BENCHMARKS }} ]]; then
            FLAGS="$FLAGS --solver-benchmarks"
          fi
          if [[ ${{ matrix.ghc }} == ${{ env.GHC_FOR_COMPLETE_HACKAGE_TESTS }} ]]; then
            FLAGS="$FLAGS --complete-hackage-tests"
          fi
          echo "FLAGS=$FLAGS" >> $GITHUB_ENV

      - name: Validate print-config
        run: sh validate.sh $FLAGS -s print-config

      - name: Validate print-tool-versions
        run: sh validate.sh $FLAGS -s print-tool-versions

      - name: Validate build
        run: sh validate.sh $FLAGS -s build

      - name: Tar cabal head executable
        if: matrix.cli != 'false' && matrix.ghc == env.GHC_FOR_RELEASE
        run: |
          CABAL_EXEC=$(cabal-plan list-bin --builddir=dist-newstyle-validate-ghc-${{ matrix.ghc }} cabal-install:exe:cabal)
          # We have to tar the executable to preserve executable permissions
          # see https://github.com/actions/upload-artifact/issues/38
          if [[ ${{ runner.os }} == 'Windows' ]]; then
            # `cabal-plan` gives us a windows path but tar needs the posix one
            CABAL_EXEC=$(cygpath $CABAL_EXEC)
          fi
          if [[ "${{ runner.os }}" == "macOS" ]]; then
             # Workaround to avoid bsdtar corrupts the executable
             # so executing it after untar throws `cannot execute binary file`
             # see https://github.com/actions/virtual-environments/issues/2619#issuecomment-788397841
             sudo /usr/sbin/purge
          fi
          tar -cvf cabal-head.tar -C $(dirname "$CABAL_EXEC") $(basename "$CABAL_EXEC")
          echo "CABAL_EXEC_TAR=cabal-head.tar" >> $GITHUB_ENV

      # We upload the cabal executable built with the ghc used in the release for:
      # - Reuse it in the dogfooding job (although we could use the cached build dir)
      # - Make it available in the workflow to make easier testing it locally
      - name: Upload cabal-install executable to workflow artifacts
        if: matrix.cli != 'false' && matrix.ghc == env.GHC_FOR_RELEASE
        uses: actions/upload-artifact@v2
        with:
          name: cabal-${{ runner.os }}-${{ matrix.ghc }}
          path: ${{ env.CABAL_EXEC_TAR }}

      - name: Validate lib-tests
        env:
          # `rawSystemStdInOut reports text decoding errors`
          # test does not find ghc without the full path in windows
          GHCPATH: ${{ steps.setup-haskell.outputs.ghc-exe }}
        run: sh validate.sh $FLAGS -s lib-tests

      - name: Validate lib-suite
        run: sh validate.sh $FLAGS -s lib-suite

      - name: Validate cli-tests
        if: matrix.cli != 'false'
        run: sh validate.sh $FLAGS -s cli-tests

      - name: Validate cli-suite
        if: matrix.cli != 'false'
        run: sh validate.sh $FLAGS -s cli-suite

  validate-old-ghcs:
    name: Validate old ghcs ${{ matrix.extra-ghc }}
    runs-on: ubuntu-latest
    needs: validate
    # This job needs an older ubuntu (16.04) cause
    # the required old ghcs using the `-dyn` flavour
    # are not installable from ppa/hvr in newer ones
    # see https://github.com/haskell/cabal/issues/8011
    container:
      image: phadej/ghc:8.8.4-xenial

    strategy:
      matrix:
        # Newer ghc versions than 8.8.4 have to be installed with ghcup cause
        # they are not available in ppa/hvr. The ghcup installation
        # needs `sudo` which is not available in the xenial container
        ghc: ["8.8.4"]
        extra-ghc: ["7.10.3", "7.8.4", "7.6.3", "7.4.2", "7.2.2", "7.0.4"]

    steps:

      # We can't use actions/checkout with the xenial docker container
      # cause it does not work with the git version included in it, see:
      # https://github.com/actions/checkout/issues/170
      # https://github.com/actions/checkout/issues/295
      # - uses: actions/checkout@v2
      - name: Checkout
        run: |
          echo $GITHUB_REF $GITHUB_SHA
          git clone --depth 1 https://github.com/$GITHUB_REPOSITORY.git .
          git fetch origin $GITHUB_SHA:temporary-ci-branch
          git checkout $GITHUB_SHA || (git fetch && git checkout $GITHUB_SHA)

      - name: Install extra compiler
        run: |
          apt-get update
          apt-get install -y ghc-${{ matrix.extra-ghc }}-dyn

      - uses: haskell/actions/setup@v1
        id: setup-haskell
        with:
          ghc-version: ${{ matrix.ghc }}

      # As we are reusing the cached build dir from the previous step
      # the generated artifacts are available here,
      # including the cabal executable and the test suite
      - uses: actions/cache@v2
        with:
          path: |
            ${{ steps.setup-haskell.outputs.cabal-store }}
            dist-*
          key: ${{ runner.os }}-${{ matrix.ghc }}-20220419-${{ github.sha }}
          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-20220419-

      - name: Install cabal-plan
        run: |
          cd $(mktemp -d)
          cabal install cabal-plan --constraint='cabal-plan +exe'
          echo "$HOME/.cabal/bin" >> $GITHUB_PATH

      - name: Validate build
        run: sh validate.sh ${{ env.COMMON_FLAGS }} -s build

      - name: "Validate lib-suite-extras --extra-hc ghc-${{ matrix.extra-ghc }}"
        env:
          EXTRA_GHC: "/opt/ghc/${{ matrix.extra-ghc }}/bin/ghc-${{ matrix.extra-ghc }}"
        run: sh validate.sh ${{ env.COMMON_FLAGS }} --lib-only -s lib-suite-extras --extra-hc ${{ env.EXTRA_GHC }}

  # The previous jobs use a released version of cabal to build cabal HEAD itself
  # This one uses the cabal HEAD generated executable in the previous step
  # to build itself again, as sanity check
  dogfooding:
    name: Dogfooding ${{ matrix.os }} ghc-${{ matrix.ghc }}
    runs-on: ${{ matrix.os }}
    needs: validate
    strategy:
      matrix:
        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
        # We only use one ghc version the used one for the next release (defined at top of the workflow)
        # We need to build an array dynamically to inject the appropiate env var in a previous job,
        # see https://docs.github.com/en/actions/learn-github-actions/expressions#fromjson
        ghc: ${{ fromJSON (needs.validate.outputs.GHC_FOR_RELEASE) }}

    steps:
      - uses: actions/checkout@v2

      - uses: haskell/actions/setup@v1
        id: setup-haskell
        with:
          ghc-version: ${{ matrix.ghc }}
          cabal-version: latest # default, we are not using it in this job

      - name: Download cabal executable from workflow artifacts
        uses: actions/download-artifact@v2
        with:
          name: cabal-${{ runner.os }}-${{ matrix.ghc }}
          path: cabal-head

      - name: Untar the cabal executable
        run: tar -xf ./cabal-head/cabal-head.tar -C ./cabal-head

      - name: print-config using cabal HEAD
        run: sh validate.sh ${{ env.COMMON_FLAGS }} --with-cabal ./cabal-head/cabal -s print-config

      # We dont use cache to force a build with a fresh store dir and build dir
      # This way we check cabal can build all its dependencies
      - name: Build using cabal HEAD
        run: sh validate.sh ${{ env.COMMON_FLAGS }} --with-cabal ./cabal-head/cabal -s build

  # We use this job as a summary of the workflow
  # It will fail if any of the previous jobs does it
  # This way we can use it exclusively in branch protection rules
  # and abstract away the concrete jobs of the workflow, including their names
  validate-post-job:
    if: always()
    name: Validate post job
    runs-on: ubuntu-latest
    # IMPORTANT! Any job added to the workflow should be added here too
    needs: [validate, validate-old-ghcs, dogfooding]

    steps:
      - run: |
          echo "jobs info: ${{ toJSON(needs) }}"
      - if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
        run: exit 1