maestro-changelog.yml

name: Add changelog for Maestro bump
on: pull_request

jobs:
  add-changelog:
    name: Add changelog
    runs-on: ubuntu-latest
    # GITHUB_TOKEN change from read-write to read-only on 2024-02-01 requires permissions block
    # https://docs.opensource.microsoft.com/github/apps/permission-changes/
    # https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs
    permissions:
      issues: write
      pull-requests: write
      contents: read
    if: github.actor == 'dotnet-maestro[bot]'

    steps:
    - name: 'Compute changelog'
      run: |
        set -exo pipefail
        git clone https://github.com/spouliot/dotnet-tools
        cd dotnet-tools/changelog
        dotnet run https://github.com/$GITHUB_REPOSITORY/pull/${GITHUB_REF_NAME/\/*/} > /tmp/changelog.txt 2>&1

    - name: 'Add changelog'
      uses: actions/github-script@v7.0.1
      with:
        github-token: ${{secrets.GITHUB_TOKEN}}
        script: |
          const fs = require('fs');
          const changelog_message = fs.readFileSync('/tmp/changelog.txt', 'utf8');
          // check if we've already added a changelog to this PR, and if so, update that comment, otherwise add a new comment
          var commentId = ""
          await github.paginate (github.rest.issues.listComments,
          {
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number
          }).then ((comments) =>
          {
            const changelogComment = comments.find(comment => comment.body.includes (".net ChangeLog for") && comment.user.login == 'github-actions[bot]')
            if (changelogComment)
              commentId = changelogComment.id
          })
          if (commentId == "") {
            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: changelog_message
            })
          } else {
            github.rest.issues.updateComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: commentId,
              body: changelog_message
            })
          }