node/.github/workflows/nix-changes.yml

# This action uses the following secrets:
#   CACHIX_AUTH_TOKEN: Write access to nodejs.cachix.org – without it, the cache is read-only.
name: Nix files edited

on:
  push:
    branches:
      - main
      - canary
      - v[0-9]+.x-staging
      - v[0-9]+.x
    paths:
      - '**.nix'
      - .github/workflows/nix-changes.yml
  pull_request:
    paths:
      - '**.nix'
      - .github/workflows/nix-changes.yml
    types: [opened, synchronize, reopened, ready_for_review]

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  diff:
    if: github.event.pull_request.draft == false
    strategy:
      fail-fast: false
      matrix:
        include:
          - runner: ubuntu-24.04
            system: x86_64-linux
          - runner: ubuntu-24.04-arm
            system: aarch64-linux
          - runner: macos-15-intel
            system: x86_64-darwin
          - runner: macos-latest
            system: aarch64-darwin
    name: '${{ matrix.system }}: dependencies diff'
    runs-on: ${{ matrix.runner }}
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
        with:
          fetch-depth: 2
          persist-credentials: false
          sparse-checkout: '*.nix'
          sparse-checkout-cone-mode: false

      - uses: cachix/install-nix-action@630ae543ea3a38a9a4166f03376c02c50f408342  # v31.11.0
        with:
          extra_nix_config: sandbox = true

      - uses: cachix/cachix-action@5f2d7c5294214f71b873db4b969586b980625e71  # v17
        with:
          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
          name: nodejs

      - name: Compute requisites after change
        shell: bash  # See https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#exit-codes-and-error-action-preference, we want the pipefail option.
        run: |
          nix-store --query --references "$(
            nix-instantiate -I "nixpkgs=./tools/nix/pkgs.nix" shell.nix \
              --arg devTools "
                (import ./tools/nix/devTools.nix {})
                ++ builtins.attrValues (
                  { inherit (import <nixpkgs> {}) nixfmt-tree sccache; }
                  // import ./tools/nix/openssl-matrix.nix {}
                  // import ./tools/nix/pkcs11.nix {}
                )")" \
          | xargs nix-store --realise \
          | xargs nix-store --query --requisites \
          | sort -k1.45 \
          > requisites-${{ matrix.system }}-after.list

      - name: Compute requisites before change
        shell: bash  # See https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#exit-codes-and-error-action-preference, we want the pipefail option.
        run: |
          git reset HEAD^ --hard
          nix-store --query --references "$(
            nix-instantiate -I "nixpkgs=./tools/nix/pkgs.nix" shell.nix \
              --arg devTools "
                (import ./tools/nix/devTools.nix {})
                ++ builtins.attrValues (
                  { inherit (import <nixpkgs> {}) nixfmt-tree sccache; }
                  // import ./tools/nix/openssl-matrix.nix {}
                  // import ./tools/nix/pkcs11.nix {}
                )")" \
          | xargs nix-store --realise \
          | xargs nix-store --query --requisites \
          | sort -k1.45 \
          > requisites-${{ matrix.system }}-before.list

      - name: Output diff
        run: |
          {
            if diff_output="$(git diff -U0 --no-color --no-index requisites-${{ matrix.system }}-before.list requisites-${{ matrix.system }}-after.list)"; then
              echo 'No changes detected.'
            else
              echo '```diff'
              echo "$diff_output" | tail -n +5
              echo '```'
            fi
          } >> "$GITHUB_STEP_SUMMARY"

      - name: Store PR number
        if: ${{ github.event.pull_request && matrix.system == 'x86_64-linux' }}
        run: echo "${{ github.event.pull_request.number }}" > pr_number.txt

      - name: Upload requisites lists
        if: ${{ github.event.pull_request }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
        with:
          name: requisites-${{ matrix.system }}
          path: |
            pr_number.*
            requisites-${{ matrix.system }}-before.list
            requisites-${{ matrix.system }}-after.list

  lint-nix:
    if: github.event.pull_request.draft == false
    runs-on: ubuntu-slim
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
        with:
          persist-credentials: false
          sparse-checkout: '*.nix'
          sparse-checkout-cone-mode: false
      - uses: cachix/install-nix-action@630ae543ea3a38a9a4166f03376c02c50f408342  # v31.11.0
      - name: Lint Nix files
        run: |
          nix-shell -I nixpkgs=./tools/nix/pkgs.nix -p 'nixfmt-tree' --run '
            treefmt --quiet --ci
          ' && EXIT_CODE="$?" || EXIT_CODE="$?"
          if [ "$EXIT_CODE" != "0" ]
          then
            git --no-pager diff || true
            exit "$EXIT_CODE"
          fi