check-sdist.yml

name: Check sdist

# 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:
    paths-ignore:
      - "doc/**"
      - "**/README.md"
      - "CONTRIBUTING.md"
    branches:
      - master
  pull_request:
    paths-ignore:
      - "doc/**"
      - "**/README.md"
      - "CONTRIBUTING.md"
  release:
    types:
      - created

jobs:

  # Dogfood the generated sdist, to avoid bugs like https://github.com/haskell/cabal/issues/9833
  # No caching, since the point is to verify they can be installed "from scratch"
  # Don't run on master or a PR targeting master, because there's never an installable Cabal
  dogfood-sdists:
    name: Dogfood sdist on ${{ matrix.os }} ghc-${{ matrix.ghc }}
    if: github.ref != 'refs/heads/master' && github.base_ref != 'master'
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest]
        # this should be kept up to date with the list in validate.yml, but should be the
        # *first* compiler release so we validate against what is hopefully the first
        # release of a corresponding Cabal and friends. it can also be short since it's
        # highly unlikely that we are releasing really old branches.
        ghc:
          [
            "9.10.1",
            "9.8.1",
            "9.6.1",
            "9.4.1",
          ]

    steps:

      - uses: haskell-actions/setup@v2
        id: setup-haskell
        with:
          ghc-version: ${{ matrix.ghc }}
          cabal-version: latest

      - uses: actions/checkout@v4

      - name: Make sdist
        run: cabal sdist cabal-install

      - name: Install from sdist
        run: |
          # skip if a suitable Cabal isn't in this ghc's bootlibs, since that's the case
          # that causes failures for users (otherwise cabal-install will install a matching
          # version itself)
          # we only want to test cabal-install, to ensure that it works with existing Cabals
          # (don't look at this too closely)
          sdist="$(ls dist-newstyle/sdist/cabal-install-*.tar.gz | sed -n '\,^dist-newstyle/sdist/cabal-install-[0-9.]*\.tar\.gz$,{;p;q;}')"
          # extract the cabal-install major version
          ver="$(echo "$sdist" | sed -n 's,^dist-newstyle/sdist/cabal-install-\([0-9][0-9]*\.[0-9][0-9]*\)\.[0-9.]*$,\1,p')"
          # dunno if this will ever be extended to freebsd, but grep -q is a gnu-ism
          if ghc-pkg --global --simple-output list Cabal | grep "^Cabal-$cbl\\." >/dev/null; then
            # sigh, someone broke installing from tarballs
            rm -rf cabal*.project Cabal Cabal-syntax cabal-install-solver cabal-install
            tar xfz "$sdist"
            cd "cabal-install-$cbl"*
            cabal install
          else
            echo No matching bootlib Cabal version to test against.
            exit 0
          fi