ghstack_land.yml

name: ghstack land
on:
  issue_comment:
    types: [created]

jobs:
  ghstack_land:
    if: ${{ github.event.issue.pull_request && contains(github.event.comment.body, '/land') }}
    runs-on: ubuntu-latest
    steps:
      - name: Show Environment Variables
        run: env
      - uses: actions/create-github-app-token@v1
        id: app-token
        with:
          app-id: ${{ vars.APP_ID }}
          private-key: ${{ secrets.PRIVATE_KEY }}
      - name: Add reaction to comment
        run: |
          COMMENT_ID=$(echo "${{ github.event.comment.id }}")
          REPO="${{ github.repository }}"

          curl -X POST \
            -H "Authorization: token ${{ steps.app-token.outputs.token }}" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/$REPO/issues/comments/$COMMENT_ID/reactions" \
            -d '{"content":"rocket"}'
      - name: Show Github Object
        run: |
          cat <<'EOF'
          ${{ toJson(github) }}
          EOF
      - name: Show Github Event Path Json
        run: 'cat $GITHUB_EVENT_PATH || true'
      - name: Check if force flag is present and has reason
        id: check-force
        run: |
          if [[ "$COMMENT" == *"--force"* ]]; then
            echo "Force flag detected, checking for reason..."

            # Extract text after --force (trim leading/trailing whitespace)
            REASON=$(echo "$COMMENT" | sed -n 's/.*--force\s*\(.*\)/\1/p' | xargs)

            if [[ -z "$REASON" ]]; then
              echo "::error::Force flag requires a reason. Please use format: /land --force <reason>"
              gh pr comment "${{ github.event.issue.html_url }}" --body "⚠️ Force landing failed: You must provide a reason when using --force. Please use the format: \`/land --force <reason>\`"
              exit 1
            else
              echo "Force reason provided: $REASON"
              echo "force_flag=--force" >> $GITHUB_OUTPUT
              echo "force_reason=$REASON" >> $GITHUB_OUTPUT
            fi
          else
            echo "No force flag detected"
            echo "force_flag=" >> $GITHUB_OUTPUT
            echo "force_reason=" >> $GITHUB_OUTPUT
          fi
        env:
          COMMENT: ${{ github.event.comment.body }}
          GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}
      - name: Install uv
        uses: astral-sh/setup-uv@v5
        with:
          version: "0.6.9"
      - name: Get PR details
        id: get-pr
        run: |
          PR_NUMBER=${{ github.event.issue.number }}
          echo "PR number is $PR_NUMBER"
          echo "pr_number=$PR_NUMBER" >> $GITHUB_OUTPUT

          # Get PR details using GitHub API
          PR_DATA=$(curl -s \
            -H "Authorization: token ${{ steps.app-token.outputs.token }}" \
            -H "Accept: application/vnd.github.v3+json" \
            "${{ github.api_url }}/repos/${{ github.repository }}/pulls/$PR_NUMBER")

          # Extract useful information
          PR_HEAD_REF=$(echo "$PR_DATA" | jq -r .head.ref)
          PR_HEAD_SHA=$(echo "$PR_DATA" | jq -r .head.sha)
          PR_URL="${{ github.server_url }}/${{ github.repository }}/pull/$PR_NUMBER"

          echo "pr_branch=$PR_HEAD_REF" >> $GITHUB_OUTPUT
          echo "pr_sha=$PR_HEAD_SHA" >> $GITHUB_OUTPUT
          echo "pr_url=$PR_URL" >> $GITHUB_OUTPUT
          echo "pr_branch=$PR_HEAD_REF"
          echo "pr_sha=$PR_HEAD_SHA"
          echo "pr_url=$PR_URL"
      - uses: actions/checkout@v4
        with:
          token: ${{ steps.app-token.outputs.token }}
          fetch-depth: '0'
      - uses: actions/setup-python@v4
        with:
          python-version: 3.9

      - name: Check Current CI Status
        if: ${{ steps.check-force.outputs.force_flag == '' }}
        run: |
          uv pip install --system requests
          echo ${{ github.event.issue.number }}
          .github/workflows/scripts/ghstack-perm-check.py ${{ github.event.issue.number }} ${{steps.get-pr.outputs.pr_branch}} ${{ github.repository }}
        env:
          GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}
      - name: Log Force Landing
        if: ${{ steps.check-force.outputs.force_flag != '' }}
        run: |
          echo "Force landing PR #${{ steps.get-pr.outputs.pr_number }}"
          echo "Reason: ${{ steps.check-force.outputs.force_reason }}"

          # Post a comment to the PR with the force reason
          gh pr comment "${{ steps.get-pr.outputs.pr_url }}" --body "⚠️ **Force landing** initiated by @${{ github.event.comment.user.login }} with reason: ${{ steps.check-force.outputs.force_reason }}"
        env:
          GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}
      - name: Land It!
        run: |
          uv pip install --system ghstack
          git config --global user.email "bot@thinkingmachines.ai"
          git config --global user.name "ghstack bot"
          cat <<EOF > ~/.ghstackrc
          [ghstack]
          github_url = github.com
          github_oauth = $GITHUB_TOKEN
          github_username = foo
          remote_name = origin
          EOF
          if ! ghstack land "${{ steps.get-pr.outputs.pr_url }}"; then
            gh pr comment "${{ steps.get-pr.outputs.pr_url }}" --body "Failed to land PR using ghstack. See workflow run: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
            exit 1
          fi
        env:
          GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}