ci-nix.yaml

# https://github.com/marketplace/actions/install-nix

name: "ci-nix"
on:
  pull_request:
  push:

concurrency:
  group: ${{ github.ref }}
  cancel-in-progress: true

jobs:
  tests:
    runs-on: ubuntu-latest
    steps:

    - uses: actions/checkout@v4

    - name: Install nix
      uses: cachix/install-nix-action@v27

    # https://github.com/marketplace/actions/cache-nix-store
    - name: Restore and cache Nix store
      uses: nix-community/cache-nix-action@v5
      with:
        # restore and save a cache using this key
        # TODO: Also hash the cabal.config and *cabal files, since we depend on them
        primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix') }}
        # if there's no cache hit, restore a cache by this prefix
        restore-prefixes-first-match: nix-${{ runner.os }}-
        # collect garbage until Nix store size (in bytes) is at most this number
        # before trying to save a new cache
        gc-max-store-size-linux: 1073741824
        # do purge caches
        purge: true
        # purge all versions of the cache
        purge-prefixes: cache-${{ runner.os }}-
        # created more than this number of seconds ago relative to the start of the `Post Restore` phase
        purge-created: 0
        # except the version with the `primary-key`, if it exists
        purge-primary-key: never

    # # Possibly need to cache cabal.
    # - name: Cache .cabal
    #   uses: actions/cache@v3
    #   with:
    #     path: ${{ steps.cabal-setup.outputs.cabal-store }}
    #     key: cabal-${{ hashFiles('cabal.project') }}

    # We currently do not have a default target
    - run: nix build --accept-flake-config .#wst-poc
    - run: nix flake --accept-flake-config check