cherryPick.yml

name: Cherry-pick a pull request

on:
  workflow_dispatch:
    inputs:
      PULL_REQUEST_NUMBER:
        description: The number of a pull request to CP
        required: true

jobs:
  validateActor:
    runs-on: ubuntu-latest
    outputs:
      IS_DEPLOYER: ${{ fromJSON(steps.isDeployer.outputs.IS_DEPLOYER) || github.actor == 'OSBotify' || github.actor == 'os-botify[bot]' }}
    steps:
      - name: Check if user is deployer
        id: isDeployer
        run: |
          if gh api /orgs/Expensify/teams/mobile-deployers/memberships/${{ github.actor }} --silent; then
            echo "IS_DEPLOYER=true" >> "$GITHUB_OUTPUT"
          else
            echo "IS_DEPLOYER=false" >> "$GITHUB_OUTPUT"
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.OS_BOTIFY_TOKEN }}

  createNewVersion:
    needs: validateActor
    if: ${{ fromJSON(needs.validateActor.outputs.IS_DEPLOYER) }}
    uses: ./.github/workflows/createNewVersion.yml
    secrets: inherit

  cherryPick:
    needs: createNewVersion
    runs-on: ubuntu-latest
    steps:
      - name: Checkout staging branch
        uses: actions/checkout@v4
        with:
          ref: staging
          token: ${{ secrets.OS_BOTIFY_TOKEN }}
          submodules: true

      - name: Set up git for OSBotify
        id: setupGitForOSBotify
        uses: ./.github/actions/composite/setupGitForOSBotifyApp
        with:
          GPG_PASSPHRASE: ${{ secrets.LARGE_SECRET_PASSPHRASE }}
          OS_BOTIFY_APP_ID: ${{ secrets.OS_BOTIFY_APP_ID }}
          OS_BOTIFY_PRIVATE_KEY: ${{ secrets.OS_BOTIFY_PRIVATE_KEY }}

      - name: Get previous app version
        id: getPreviousVersion
        uses: ./.github/actions/javascript/getPreviousVersion
        with:
          SEMVER_LEVEL: "PATCH"

      - name: Fetch history of relevant refs
        run: |
          git fetch origin main staging --no-tags --shallow-exclude ${{ steps.getPreviousVersion.outputs.PREVIOUS_VERSION }}

      - name: Get version bump commit
        id: getVersionBumpCommit
        run: |
          git switch main
          VERSION_BUMP_COMMIT="$(git log --format='%H' --author='OSBotify' --grep 'Update version to ${{ needs.createNewVersion.outputs.NEW_VERSION }}')"
          echo "VERSION_BUMP_SHA=$VERSION_BUMP_COMMIT" >> "$GITHUB_OUTPUT"

      - name: Get merge commit for pull request to CP
        id: getCPMergeCommit
        uses: ./.github/actions/javascript/getPullRequestDetails
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          USER: ${{ github.actor }}
          PULL_REQUEST_NUMBER: ${{ github.event.inputs.PULL_REQUEST_NUMBER }}

      - name: Cherry-pick the version-bump to staging
        run: |
          git switch staging
          git cherry-pick -S -x --mainline 1 --strategy=recursive -Xtheirs ${{ steps.getVersionBumpCommit.outputs.VERSION_BUMP_SHA }}

      - name: Cherry-pick the merge commit of target PR
        id: cherryPick
        run: |
          echo "Attempting to cherry-pick ${{ steps.getCPMergeCommit.outputs.MERGE_COMMIT_SHA }}"
          if git cherry-pick -S -x --mainline 1 ${{ steps.getCPMergeCommit.outputs.MERGE_COMMIT_SHA }}; then
            echo "🎉 No conflicts! CP was a success, PR can be automerged 🎉"
            echo "HAS_CONFLICTS=false" >> "$GITHUB_OUTPUT"
            git commit --amend -m "$(git log -1 --pretty=%B)" -m "(CP triggered by ${{ github.actor }})"
          else
            echo "😞 PR can't be automerged, there are merge conflicts in the following files:"
            git --no-pager diff --name-only --diff-filter=U
            git cherry-pick --abort
            echo "HAS_CONFLICTS=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Push changes
        run: |
          if [[ ${{steps.cherryPick.outputs.HAS_CONFLICTS}} == 'true' ]]; then
            git checkout -b ${{ github.actor }}-cherry-pick-staging-${{ github.event.inputs.PULL_REQUEST_NUMBER }}-${{ github.run_attempt }}
            git push --set-upstream origin ${{ github.actor }}-cherry-pick-staging-${{ github.event.inputs.PULL_REQUEST_NUMBER }}-${{ github.run_attempt }}
          else
            git push origin staging
          fi

      - name: Create Pull Request to manually finish CP
        if: fromJSON(steps.cherryPick.outputs.HAS_CONFLICTS)
        id: createPullRequest
        run: |
          gh pr create \
            --title "🍒 Cherry pick PR #${{ github.event.inputs.PULL_REQUEST_NUMBER }} to staging 🍒" \
            --body \
              "🍒 Cherry pick https://github.com/Expensify/App/pull/${{ github.event.inputs.PULL_REQUEST_NUMBER }} to staging 🍒
              This PR had conflicts when we tried to cherry-pick it to staging. You'll need to manually perform the cherry-pick, using the following steps:

              \`\`\`bash
              git fetch
              git checkout ${{ github.actor }}-cherry-pick-staging-${{ github.event.inputs.PULL_REQUEST_NUMBER }}-${{ github.run_attempt }}
              git cherry-pick -S -x --mainline 1 ${{ steps.getCPMergeCommit.outputs.MERGE_COMMIT_SHA }}
              \`\`\`

              Then manually resolve conflicts, and commit the change with \`git cherry-pick --continue\`. Lastly, please run:

              \`\`\`bash
              git commit --amend -m \"$(git log -1 --pretty=%B)\" -m \"(CP triggered by ${{ github.actor }})\"
              \`\`\`

              That will help us keep track of who triggered this CP. Once all that's done, push your changes with \`git push origin ${{ github.actor }}-cherry-pick-staging-${{ github.event.inputs.PULL_REQUEST_NUMBER }}-${{ github.run_attempt }}\`, and then open this PR for review.
          
              Note that you **must** test this PR, and both the author and reviewer checklist should be completed, just as if you were merging the PR to main." \
            --label "Engineering,Hourly" \
            --base "staging"
          sleep 5
          gh pr comment --body \
            "This pull request has merge conflicts and can not be automatically merged. :disappointed:
             Please manually resolve the conflicts, push your changes, and then request another reviewer to review and merge.
             **Important:** There may be conflicts that GitHub is not able to detect, so please _carefully_ review this pull request before approving."
          ORIGINAL_PR_AUTHOR="$(gh pr view ${{ github.event.inputs.PULL_REQUEST_NUMBER }} --json author --jq .author.login)"
          gh pr edit --add-assignee "${{ github.actor }},${{ steps.getCPMergeCommit.outputs.MERGE_ACTOR }},$ORIGINAL_PR_AUTHOR"
        env:
          GITHUB_TOKEN: ${{ steps.setupGitForOSBotify.outputs.OS_BOTIFY_API_TOKEN }}

      - name: Label original PR with CP Staging
        run: gh pr edit ${{ inputs.PULL_REQUEST_NUMBER }} --add-label 'CP Staging'
        env:
          GITHUB_TOKEN: ${{ github.token }}

      - name: "Announces a CP failure in the #announce Slack room"
        uses: 8398a7/action-slack@v3
        if: ${{ failure() }}
        with:
          status: custom
          custom_payload: |
            {
              channel: '#announce',
              attachments: [{
                color: "#DB4545",
                pretext: `<!subteam^S4TJJ3PSL>`,
                text: `💥 Failed to CP https://github.com/Expensify/App/pull/${{ github.event.inputs.PULL_REQUEST_NUMBER }} to staging 💥`,
              }]
            }
        env:
          GITHUB_TOKEN: ${{ github.token }}
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}