pull-request.yml

#
# This workflow is run for pull requests the modify the `packages` directory.
# It works in two stages: first it determines the list of added, modified or
# removed packages; for each added or modified package, it executes the
# `validate_package.py` script to check for issues with the metadata or
# tarball. Provided these initial tests pass, the second stage consists of
# invoking a separate workflow which runs tests for all packages in the
# package distribution as they would appear when the PR under review would be
# merged. This is used to determine whether any package tests change from PASS
# to FAIl or vice versa.
#
name: "PR"

on:
  workflow_dispatch:  # manual trigger for debugging
  pull_request:
    paths:
      - 'packages/*/meta.json'

concurrency:
  # group by workflow and ref
  group: ${{ github.workflow }}-${{ github.ref }}
  # Cancel intermediate builds, but only if it is a pull request build.
  cancel-in-progress: true

jobs:
  detect-changes:
    name: "Detect affected packages"
    runs-on: ubuntu-20.04
    if: ${{ !contains( github.event.pull_request.labels.*.name, 'skip tests') }}
    outputs:
      modified: ${{ steps.modified.outputs.modified }}
    steps:
      # clone with depth 0, so that we can determine what was changed
      # TODO: isn't depth 1 sufficient?
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: "Install package distribution tools"
        run: python -m pip install -r tools/requirements.txt

      # the following step is useful for debugging
      - name: "Determine system architecture for -march=native"
        run: |
          echo "cc -march=native: $(tools/compiler_arch.sh cc)"
          echo "c++ -march=native: $(tools/compiler_arch.sh c++)"

      # Setup ccache, to speed up repeated compilation of the same binaries
      # (i.e., GAP and the packages)
      - name: "Setup ccache"
        uses: Chocobo1/setup-ccache-action@v1
        with:
          update_packager_index: false

      - name: "Install GAP"
        uses: gap-actions/setup-gap@v2
        with:
          GAP_BOOTSTRAP: 'minimal'
          GAP_PKGS_TO_CLONE: 'json'
          GAP_PKGS_TO_BUILD: 'json'

      - name: "Determine what was added or modified, validate"
        id: modified
        run: |
            modified=$(git diff --name-only --no-renames --diff-filter=AM ${{ github.event.pull_request.base.sha }} -- packages/*/meta.json)
            echo "Added or updated packages: ${modified}"
            if [[ -n "${modified}" ]]; then
              echo "modified=true" >> $GITHUB_OUTPUT
            else
              echo "modified=false" >> $GITHUB_OUTPUT
            fi

            echo "Obtain copies of old metadata, if any..."
            for PKG in ${modified}; do
              git cat-file blob ${{ github.event.pull_request.base.sha }}:$PKG > $PKG.old || rm -f $PKG.old
            done

            echo "Validate metadata..."
            tools/validate_package.py ${modified}

  test-all-master:
    name: "master"
    needs: detect-changes
    if: ${{ needs.detect-changes.outputs.modified == 'true' }}
    uses: ./.github/workflows/test-all.yml
    with:
      which-gap: 'master'

  test-all-release:
    name: "4.12.2"
    needs: detect-changes
    if: ${{ needs.detect-changes.outputs.modified == 'true' }}
    uses: ./.github/workflows/test-all.yml
    with:
      which-gap: '4.12.2'

  status-comment:
    name: "Create or update PR comment"
    runs-on: ubuntu-20.04
    needs: test-all-master  # TODO: also handle test-all-release
    if: always()
    steps:
      - name: "Download report"
        uses: actions/download-artifact@v3
        with:
          name: report-master
          path: _report

      - name: "Prepare report.md"
        id: get-comment-body
        run: |
          echo "body<<EOF1234567890EOF" >> $GITHUB_OUTPUT
          cat _report/report.md >> $GITHUB_OUTPUT
          echo "EOF1234567890EOF" >> $GITHUB_OUTPUT

      - name: "Find Comment"
        uses: peter-evans/find-comment@v2
        id: fc
        with:
          issue-number: ${{ github.event.pull_request.number }}
          # comment-author: "gap-package-distribution-bot <100730870+gap-package-distribution-bot[bot]@users.noreply.github.com>"
          body-includes: "Package Evaluation Report"

      # We set up a GitHub App in order to ensure that workflows are run on the PRs
      # created by us, following the instructions here:
      # <https://github.com/peter-evans/create-pull-request/blob/main/docs/concepts-guidelines.md#authenticating-with-github-app-generated-tokens>
      # The bot can also be set up for personal forks of this repository, for testing
      # and debugging, see <https://github.com/apps/gap-package-distribution-bot>.
      - uses: tibdex/github-app-token@v1
        id: generate-token
        with:
          app_id: ${{ secrets.APP_ID }}
          private_key: ${{ secrets.APP_PRIVATE_KEY }}

      # TODO: extra work is needed to make the following work with pull requests
      # that come from forks of this repository.
      - name: "Create or update comment"
        uses: peter-evans/create-or-update-comment@v2
        with:
          token: ${{ steps.generate-token.outputs.token }}
          comment-id: ${{ steps.fc.outputs.comment-id }}
          issue-number: ${{ github.event.pull_request.number }}
          body: ${{ steps.get-comment-body.outputs.body }}
          edit-mode: replace