# `nixpkgs-vet` is a tool to vet Nixpkgs: its architecture, package structure, and more.
# Among other checks, it makes sure that `pkgs/by-name` (see `../../pkgs/by-name/README.md`) follows the validity rules outlined in [RFC 140](https://github.com/NixOS/rfcs/pull/140).
# When you make changes to this workflow, please also update `ci/nixpkgs-vet.sh` to reflect the impact of your work to the CI.
# See https://github.com/NixOS/nixpkgs-vet for details on the tool and its checks.
name: Vet nixpkgs

on:
  # Using pull_request_target instead of pull_request avoids having to approve first time contributors.
  pull_request_target:
    # This workflow depends on the base branch of the PR, but changing the base branch is not included in the default trigger events, which would be `opened`, `synchronize` or `reopened`.
    # Instead it causes an `edited` event, so we need to add it explicitly here.
    # While `edited` is also triggered when the PR title/body is changed, this PR action is fairly quick, and PRs don't get edited **that** often, so it shouldn't be a problem.
    # There is a feature request for adding a `base_changed` event: https://github.com/orgs/community/discussions/35058
    types: [opened, synchronize, reopened, edited]

permissions: {}

# We don't use a concurrency group here, because the action is triggered quite often (due to the PR edit trigger), and contributors would get notified on any canceled run.
# There is a feature request for suppressing notifications on concurrency-canceled runs: https://github.com/orgs/community/discussions/13015

jobs:
  check:
    name: nixpkgs-vet
    # This needs to be x86_64-linux, because we depend on the tooling being pre-built in the GitHub releases.
    runs-on: ubuntu-latest
    # This should take 1 minute at most, but let's be generous. The default of 6 hours is definitely too long.
    timeout-minutes: 10
    steps:
      # This checks out the base branch because of pull_request_target
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          path: base
          sparse-checkout: ci
      - name: Resolving the merge commit
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          if mergedSha=$(base/ci/get-merge-commit.sh ${{ github.repository }} ${{ github.event.number }}); then
            echo "Checking the merge commit $mergedSha"
            echo "mergedSha=$mergedSha" >> "$GITHUB_ENV"
          else
            echo "Skipping the rest..."
          fi
          rm -rf base
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        if: env.mergedSha
        with:
          # pull_request_target checks out the base branch by default
          ref: ${{ env.mergedSha }}
          # Fetches the merge commit and its parents
          fetch-depth: 2
      - name: Checking out base branch
        if: env.mergedSha
        run: |
          base=$(mktemp -d)
          git worktree add "$base" "$(git rev-parse HEAD^1)"
          echo "base=$base" >> "$GITHUB_ENV"
      - uses: cachix/install-nix-action@08dcb3a5e62fa31e2da3d490afc4176ef55ecd72 # v30
        if: env.mergedSha
      - name: Fetching the pinned tool
        if: env.mergedSha
        # Update the pinned version using ci/nixpkgs-vet/update-pinned-tool.sh
        run: |
          # The pinned version of the tooling to use.
          toolVersion=$(<ci/nixpkgs-vet/pinned-version.txt)

          # Fetch the x86_64-linux-specific release artifact containing the gzipped NAR of the pre-built tool.
          toolPath=$(curl -sSfL https://github.com/NixOS/nixpkgs-vet/releases/download/"$toolVersion"/x86_64-linux.nar.gz \
            | gzip -cd | nix-store --import | tail -1)

          # Adds a result symlink as a GC root.
          nix-store --realise "$toolPath" --add-root result
      - name: Running nixpkgs-vet
        if: env.mergedSha
        env:
          # Force terminal colors to be enabled. The library that `nixpkgs-vet` uses respects https://bixense.com/clicolors/
          CLICOLOR_FORCE: 1
        run: |
          if result/bin/nixpkgs-vet --base "$base" .; then
            exit 0
          else
            exitCode=$?
            echo "To run locally: ./ci/nixpkgs-vet.sh $GITHUB_BASE_REF https://github.com/$GITHUB_REPOSITORY.git"
            echo "If you're having trouble, ping @NixOS/nixpkgs-vet"
            exit "$exitCode"
          fi