sync-with-master.yml

# This workflow will sync commits from a PR from master to a target branch.
name: Sync PR from master

# on:
#   pull_request_target:
#     types:
#       - closed
#     branches:
#       - master

env:
  REPOSITORY: carbon-identity-framework
  GIT_USERNAME: jenkins-is-staging
  PRODUCT_REPOSITORY_FORKED: $GIT_USERNAME'/'${REPOSITORY}
  PRODUCT_REPOSITORY_PUBLIC: wso2/$REPOSITORY
  BUILD_NUMBER: ${{github.run_id}}
  SYNCHRONIZE_BRANCH_NAME: master_sync_github_action/$BUILD_NUMBER
  TARGET_BRANCH_NAME: 6.0.x

jobs:
  create_pr:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Cherry pick commits from last PR
        run: |
          echo "Clean up any existing files"
          echo "=========================================================="
          rm -rf ${{ env.REPOSITORY }}
          echo ""

          echo "Cloning: https://github.com/'${{ env.PRODUCT_REPOSITORY_FORKED }}"
          echo "=========================================================="
          git clone 'https://github.com/'${{ env.PRODUCT_REPOSITORY_FORKED }}'.git'
          cd ${{ env.REPOSITORY }}
          echo ""

          echo 'Add remote: upstream as https://github.com/'${{ env.PRODUCT_REPOSITORY_PUBLIC }}
          echo "=========================================================="
          git remote add upstream 'https://github.com/'${{ env.PRODUCT_REPOSITORY_PUBLIC }}
          echo ""

          echo 'Fetching: upstream'
          echo "=========================================================="
          git fetch upstream
          echo ""

          echo 'Checking out: upstream:master branch'
          echo "=========================================================="
          git checkout -b upstream/master remotes/upstream/master
          echo ""

          echo "Get latest merged PR details"
          echo "=========================================================="
          LATEST_PR_SHA=$(git log --merges --oneline | grep  "Merge pull request" | head -n 1 | cut -d ' ' -f1)
          MERGED_PR=$(curl -s "https://api.github.com/search/issues?q=${LATEST_PR_SHA}+type:pr+is:merged+base:master")
          PR_NUMBER=$(echo $MERGED_PR | jq -r '.items[0].number')
          PR_URL=$(echo $MERGED_PR | jq -r '.items[0].html_url')
          PR_TITLE=$(echo $MERGED_PR | jq -r '.items[0].title')
          PR_USER=$(echo $MERGED_PR | jq -r '.items[0].user.login')
          if [[ "$PR_NUMBER" = null ]]; then
            echo "No PR found for commit: $LATEST_PR_SHA"
            exit 1
          else
            echo "PR #$PR_NUMBER found for commit: $LATEST_PR_SHA"
          fi
          echo ""

          echo "Get commits of the PR"
          echo "=========================================================="
          PR_COMMITS=$(curl -H "Accept: application/vnd.github+json" \
            "https://api.github.com/repos/${{ env.PRODUCT_REPOSITORY_PUBLIC }}/pulls/$PR_NUMBER/commits")
          PR_COMMITS_SHA=$(echo $PR_COMMITS | jq -r '.[].sha')
          echo ""

          echo 'Checking out: upstream:'${{ env.TARGET_BRANCH_NAME }}' branch'
          echo "=========================================================="
          git checkout -b ${{ env.SYNCHRONIZE_BRANCH_NAME }} 'remotes/upstream/'${{ env.TARGET_BRANCH_NAME }}
          echo ""

          echo "Cherry-pick Commits"
          echo "=========================================================="
          git config --global user.name ${GIT_USERNAME}
          for commit in $PR_COMMITS_SHA
          do
            if [[ $(git show --no-patch --format=%p $commit | wc -w) -gt 1 ]]; then
              echo "Skipping merge commit: $commit"
              continue
            fi
            git cherry-pick $commit
          done
          echo ""

          echo 'Push Changes'
          echo "=========================================================="
          git remote rm origin
          git remote add origin 'https://'${{ secrets.PAT }}'@github.com/'${{ env.PRODUCT_REPOSITORY_FORKED }}
          git push -u origin ${{ env.SYNCHRONIZE_BRANCH_NAME }}
          echo ""

          echo 'Send Pull Request'
          echo "=========================================================="
          TITLE="Merge '${PR_TITLE}' to ${{ env.TARGET_BRANCH_NAME }}"
          BODY="[Auto generated]\nThis PR merges ${PR_URL} from the master branch to ${{ env.TARGET_BRANCH_NAME }} branch\nLink : https://github.com/${{ env.PRODUCT_REPOSITORY_PUBLIC }}/actions/runs/${{github.run_id}}"
          RESPONSE=$(curl -s -w "%{http_code}" -k -X \
          POST https://api.github.com/repos/${{ env.PRODUCT_REPOSITORY_PUBLIC }}/pulls \
          -H "Authorization: Bearer "${{ secrets.PAT }}"" \
          -H "Content-Type: application/json" \
          -d '{ "title": "'"${TITLE}"'","body": "'"${BODY}"'","head": "'"${{ env.GIT_USERNAME }}:${{ env.SYNCHRONIZE_BRANCH_NAME }}"'","base":"'"${{ env.TARGET_BRANCH_NAME }}"'"}')
          RESPONSE_BODY=${RESPONSE::-3}
          STATUS=$(printf "%s" "$RESPONSE" | tail -c 3)
          if [[ $STATUS != "201" ]]; then
            echo "Error while creating the PR"
            echo $RESPONSE_BODY
            exit 1
          fi
          echo "PR created successfully"
          echo $RESPONSE_BODY | jq -r '.html_url'
          PR_NUMBER=$(echo "${RESPONSE_BODY}" | jq -r '.number')
          
          echo 'Add comment to the PR'
          echo "=========================================================="
          COMMENT_BODY="Hi @${PR_USER}, please review and merge this PR."
          RESPONSE=$(curl -s -w "%{http_code}" -k -X \
          POST https://api.github.com/repos/${{ env.PRODUCT_REPOSITORY_PUBLIC }}/issues/${PR_NUMBER}/comments \
          -H "Authorization: Bearer "${{ secrets.PAT }}"" \
          -H "Content-Type: application/json" \
          -d '{ "body": "'"${COMMENT_BODY}"'"}')