create_release_draft.yml

name: Create Release Draft
on:
  schedule:
    # * is a special character in YAML so you have to quote this string
    - cron: "0 3 * * 1-5" # run integration tests at 3 AM, monday to friday (1-5)

  workflow_dispatch: # run only when triggered manually
    inputs:
      branch:
        description: "Branch to create release draft from (e.g., master, release-x.y.z)"
        required: true
        default: "master"
defaults:
  run:
    shell: bash
jobs:
  prepare-release:
    name: "Prepare release"
    runs-on: ubuntu-20.04
    outputs:
      BRANCH: ${{ steps.determine_branch.outputs.BRANCH }}
    steps:
      - name: Check out code.
        uses: actions/checkout@v4.1.1

      - name: Create downloads folder
        run: mkdir ~/downloads

      - name: Cache downloads paths
        uses: actions/cache@v3
        with:
          path: |
            ~/downloads
          key: ${{ runner.os }}-${{ matrix.CLOUD_PROVIDER }}-downloads

      - name: Determine Target Branch for Release draft
        id: determine_branch
        run: |
          if [[ "${{ github.event.inputs.branch }}" != "" ]]; then
            BRANCH=${{ github.event.inputs.branch }}
            echo "Using $BRANCH as target branch for release draft"
          else
            echo "Determining branch based on what triggered this workflow"

            if [[ "${GITHUB_REF}" == "refs/heads"* ]]; then
              echo "This is a push to a local branch -> using branch name"
              BRANCH=${GITHUB_REF#refs/heads/}
              echo "Branch Name: $BRANCH"
            else
              if [[ "${GITHUB_REF}" == "refs/pull/"* ]]; then
                # usually the format for PRs is: refs/pull/1234/merge
                echo "::error::This is a Pull Request, and PRs are not supported yet"
                exit 1
              else
                echo "::error This is neither a push, nor a PR, probably something else... Exiting"
                exit 1
              fi
            fi
          fi

          echo "##[set-output name=BRANCH;]$(echo ${BRANCH})"
  #######################################################################
  # This job publishes a draft release based on the previous steps      #
  #######################################################################
  publish-draft-release:
    name: Publish Draft release
    needs: prepare-release
    runs-on: ubuntu-20.04
    env:
      BRANCH: ${{ needs.prepare-release.outputs.BRANCH }}
      REPO_SLUG: "keptn-contrib/dynatrace-service"
    steps:
      - name: Check out code
        uses: actions/checkout@v4.1.1

      - name: Debug - Output Branch
        run: echo $BRANCH

      - name: Load CI Environment from .ci_env
        id: load_ci_env
        uses: c-py/action-dotenv-to-setenv@v4
        with:
          env-file: .ci_env

      - name: Find latest successful run ID
        id: last_run_id
        run: |
          RUN_ID=$(curl -sLH 'Accept: application/vnd.github.v3+json' -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" "api.github.com/repos/$REPO_SLUG/actions/workflows/CI.yml/runs" | jq --arg branch "$BRANCH" -c '[.workflow_runs[] | select( .conclusion == "success" and .head_branch == $branch)][0] | .id')
          echo "::set-output name=RUN_ID::$RUN_ID"

      - name: Download all artifacts from last successful build of specified branch
        uses: dawidd6/action-download-artifact@v2.28.0
        with:
          github_token: ${{secrets.GITHUB_TOKEN}}
          # Required, workflow file name or ID
          workflow: CI.yml
          run_id: ${{ steps.last_run_id.outputs.RUN_ID }}
          # Optional, directory where to extract artifact
          path: ./dist

      - name: Load Build-Config Environment from ./dist/build-config/build-config.env
        id: load_build_env
        uses: c-py/action-dotenv-to-setenv@v4
        with:
          env-file: ./dist/build-config/build-config.env

      - name: Overwrite VERSION String for nightly builds
        run: |
          if [[ "$BRANCH" == "master" ]]; then
            # use VERSION.DATETIME for the cli version (e.g., nightly build)
            VERSION=${VERSION}.${DATETIME}
            # overwrite VERSION
            echo "VERSION=${VERSION}" >> $GITHUB_ENV
          fi

      - name: DEBUG Build-Config
        run: |
          echo VERSION=${VERSION}
          echo BRANCH=${BRANCH}

      # Part of this job is to check if a releasenotes file exists and to use it as the release message
      - name: Try getting release notes
        id: get_releasenotes
        run: |
          filename="releasenotes/releasenotes_V${VERSION}.md"
          if [[ -f "$filename" ]]; then
            echo "Found releasenotes in $filename"
          else
            echo "::warning Could not find release notes $filename, using releasenotes_develop"
            filename="releasenotes/releasenotes_develop.md"
          fi

          echo "##[set-output name=RELEASENOTES_FILENAME;]$(echo ${filename})"

      # Create release message by concatenating releasenotes with the test/build report
      - name: Create a Release message
        env:
          RELEASENOTES_FILENAME: ${{ steps.get_releasenotes.outputs.RELEASENOTES_FILENAME }}
        run: |
          # print CI information
          echo ""  >> release-notes.txt
          echo "<details><summary>CI Information</summary>"  >> release-notes.txt
          echo "<p>" >> release-notes.txt
          echo "" >> release-notes.txt
          echo "* **BUILD ${VERSION} ON ${BRANCH}**" >> release-notes.txt
          echo "* **DATETIME**: $DATETIME" >> release-notes.txt
          echo "* **GIT_SHA**: $GIT_SHA" >> release-notes.txt
          echo "* **ACTION RUN**: $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID" >> release-notes.txt
          echo "" >> release-notes.txt
          echo "" >> release-notes.txt
          echo "" >> release-notes.txt
          echo "</p>" >> release-notes.txt
          echo "</details>" >> release-notes.txt

      - name: Abort if (published) release already exists
        uses: actions/github-script@v6
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            let tag = "${{ env.VERSION }}";
            console.log(`Trying to fetch release by tag '${tag}'...`);

            try {
              release = await github.rest.repos.getReleaseByTag({
                owner: context.repo.owner,
                repo: context.repo.repo,
                tag: tag
              });
              console.log("::error Release already exists... Aborting!");
              core.setFailed("Release already exists... Aborting!");

              return 1; // failure
            } catch (error) {
              // release not found -> okay
              console.log("No release found -> okay");
              return 0;
            }

      - name: Delete draft release if it already exists
        uses: actions/github-script@v6
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            let tag = "${{ env.VERSION }}";
            console.log(`Trying to fetch DRAFT release by tag '${tag}'...`);

            try {
              // get all releases (including drafts)
              let releases = await github.rest.repos.listReleases({
                owner: context.repo.owner,
                repo: context.repo.repo
              });
              // find a draft release
              let release = releases.data.find(release => release.tag_name === tag);
              if (release) {
                // found a release with specified tag; check if it is a draft release
                if (release.draft) {
                  // found a draft release
                  console.log(`🥳 Found a draft release with id ${release.id}, deleting it`);
                  console.log(`Release Tag Name: ${release.tag_name}`);
                  console.log(`Release Draft: ${release.draft}`);
                  console.log(`Release URL: ${release.html_url}`);

                  console.log(`::error::Draft release found, please delete it manually!`);

                  return 1;
                  // ToDo: Commented out as there seems to be a problem with deleting releases

                  /*github.repos.deleteRelease({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    release_id: release.id
                  });*/

                  console.log("Deleted! -> okay");
                } else {
                  console.log("::error Release with tag found, but it's not a draft release");
                  core.setFailed("Release with tag found, but it's not a draft release");
                }
              } else {
                console.log("No draft release found -> okay");
              }

              return 0;
            } catch (error) {
              // error happened
              console.log("An error happened while trying to fetch all releases:");
              console.log(error);
              throw error;
            }

      - name: Draft Release with Releasenotes
        id: create_draft_release
        uses: softprops/action-gh-release@v1
        with:
          name: ${{ env.VERSION }}
          tag_name: ${{ env.VERSION }}
          draft: true # we only want to publish draft releases here - a human should review it and push the button eventually
          prerelease: true # mark as pre-release for now, a human can always change it to a non-prerelease afterwards
          body_path: release-notes.txt
          files: |
            dist/installer/*.tgz
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}