pr-bot.yaml

name: PR Bot

on:
  issue_comment:
    types: [created]

permissions:
  contents: write
  pull-requests: write
  issues: write
  actions: write
  attestations: write
  id-token: write
  packages: write

jobs:
  handle-command:
    # Only run on PR comments (not issue comments) and from authorized users
    if: |
      github.event.issue.pull_request &&
      startsWith(github.event.comment.body, '/') &&
      (
        github.event.comment.author_association == 'OWNER' ||
        github.event.comment.author_association == 'MEMBER' ||
        github.event.comment.author_association == 'COLLABORATOR'
      )
    runs-on: ubuntu-latest
    steps:
      - name: Get PR info
        id: pr-info
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          PR_DATA=$(gh api repos/${{ github.repository }}/pulls/${{ github.event.issue.number }})
          echo "head_sha=$(echo "$PR_DATA" | jq -r '.head.sha')" >> $GITHUB_OUTPUT
          echo "head_ref=$(echo "$PR_DATA" | jq -r '.head.ref')" >> $GITHUB_OUTPUT
          echo "base_ref=$(echo "$PR_DATA" | jq -r '.base.ref')" >> $GITHUB_OUTPUT

      - name: Parse command
        id: parse
        run: |
          COMMENT="${{ github.event.comment.body }}"
          COMMAND=$(echo "$COMMENT" | head -1 | awk '{print $1}' | tr -d '/')
          ARGS=$(echo "$COMMENT" | head -1 | cut -d' ' -f2- -s)

          echo "command=$COMMAND" >> $GITHUB_OUTPUT
          echo "args=$ARGS" >> $GITHUB_OUTPUT
          echo "Parsed command: $COMMAND, args: $ARGS"

      - name: React to comment
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          gh api repos/${{ github.repository }}/issues/comments/${{ github.event.comment.id }}/reactions \
            -f content='eyes' || true

      - name: Handle /help
        if: steps.parse.outputs.command == 'help'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          HELP_MSG=$(cat << 'EOF'
          ## 🤖 PR Bot Commands

          | Command | Description |
          |---------|-------------|
          | `/help` | Show this help message |
          | `/build` | Build all changed recipes in this PR |
          | `/build x86_64` | Build for specific host (x86_64, aarch64) |
          | `/build <recipe>` | Build a specific recipe |
          | `/lint` | Run linter on changed recipes |
          | `/check` | Check upstream versions |
          | `/approve` | Approve and merge (maintainers only) |

          <sub>Commands are only available to repository collaborators.</sub>
          EOF
          )

          gh pr comment ${{ github.event.issue.number }} \
            --repo ${{ github.repository }} \
            --body "$HELP_MSG"

      - name: Handle /build
        if: steps.parse.outputs.command == 'build'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          ARGS="${{ steps.parse.outputs.args }}"
          PR_NUM="${{ github.event.issue.number }}"

          # Parse args: each word is either a host or a package
          HOST="ALL"
          PACKAGE=""
          for arg in $ARGS; do
            case "$arg" in
              x86_64|X86_64|x86_64-linux) HOST="x86_64-linux" ;;
              aarch64|AARCH64|arm64|aarch64-linux) HOST="aarch64-linux" ;;
              all|ALL) HOST="ALL" ;;
              *) PACKAGE="$arg" ;;
            esac
          done

          # Build info for comment
          PKG_INFO=""
          if [ -n "$PACKAGE" ]; then
            PKG_INFO="| **Package** | \`${PACKAGE}\` |"
          fi

          # Post acknowledgment
          gh pr comment "$PR_NUM" \
            --repo ${{ github.repository }} \
            --body "🚀 **Build triggered!**

          | | |
          |---|---|
          | **PR** | #${PR_NUM} |
          | **Host** | \`${HOST}\` |
          ${PKG_INFO}
          | **Triggered by** | @${{ github.event.comment.user.login }} |

          Build will start shortly. I'll post results when complete.

          [View workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})"

          # Trigger the build workflow
          gh workflow run pr-build-test.yaml \
            --repo ${{ github.repository }} \
            -f pr_number="$PR_NUM" \
            -f host="$HOST" \
            -f package="$PACKAGE"

      - name: Checkout for lint
        if: steps.parse.outputs.command == 'lint'
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Handle /lint
        if: steps.parse.outputs.command == 'lint'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          PR_NUM="${{ github.event.issue.number }}"
          HEAD_SHA="${{ steps.pr-info.outputs.head_sha }}"
          BASE_REF="${{ steps.pr-info.outputs.base_ref }}"

          gh pr comment "$PR_NUM" \
            --repo ${{ github.repository }} \
            --body "🔍 **Running linter...**"

          # Checkout PR branch
          gh pr checkout "$PR_NUM"

          # Download sbuild
          curl -fsSL "https://github.com/pkgforge/sbuilder/releases/download/nightly/sbuild-x86_64-linux" \
            -o /tmp/sbuild && chmod +x /tmp/sbuild

          # Get changed files
          CHANGED=$(git diff --name-only "origin/${BASE_REF}" HEAD -- 'binaries/**/*.yaml' 'packages/**/*.yaml' 2>/dev/null || true)

          if [ -z "$CHANGED" ]; then
            gh pr comment "$PR_NUM" \
              --repo ${{ github.repository }} \
              --body "✅ **Lint complete** - No recipe files changed"
            exit 0
          fi

          # Run linter on each file
          RESULTS="| Recipe | Status | Details |
          |--------|--------|---------|"
          HAS_ERRORS=false

          for file in $CHANGED; do
            if [ -f "$file" ]; then
              if /tmp/sbuild lint "$file" > /tmp/lint-output.txt 2>&1; then
                RESULTS="${RESULTS}
          | \`${file}\` | ✅ Valid | - |"
              else
                ERROR_MSG=$(cat /tmp/lint-output.txt | head -3 | tr '\n' ' ' | head -c 100)
                RESULTS="${RESULTS}
          | \`${file}\` | ❌ Invalid | ${ERROR_MSG:-Unknown error} |"
                HAS_ERRORS=true
              fi
            fi
          done

          if [ "$HAS_ERRORS" = true ]; then
            EMOJI="❌"
            STATUS="Lint Failed"
          else
            EMOJI="✅"
            STATUS="Lint Passed"
          fi

          gh pr comment "$PR_NUM" \
            --repo ${{ github.repository }} \
            --body "## ${EMOJI} ${STATUS}

          ${RESULTS}

          <sub>Triggered by @${{ github.event.comment.user.login }}</sub>"

      - name: Checkout for check
        if: steps.parse.outputs.command == 'check'
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Handle /check
        if: steps.parse.outputs.command == 'check'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          PR_NUM="${{ github.event.issue.number }}"

          gh pr comment "$PR_NUM" \
            --repo ${{ github.repository }} \
            --body "🔍 **Checking upstream versions...**"

          # Checkout PR branch
          gh pr checkout "$PR_NUM"

          # Download sbuild
          curl -fsSL "https://github.com/pkgforge/sbuilder/releases/download/nightly/sbuild-x86_64-linux" \
            -o /tmp/sbuild && chmod +x /tmp/sbuild || {
            gh pr comment "$PR_NUM" \
              --repo ${{ github.repository }} \
              --body "⚠️ Failed to download sbuild"
            exit 1
          }

          # Run version check
          /tmp/sbuild meta check-updates \
            --recipes ./binaries ./packages \
            --output /tmp/updates.json \
            --parallel 5 \
            --timeout 30 || true

          if [ ! -f /tmp/updates.json ] || [ "$(jq 'length' /tmp/updates.json)" = "0" ]; then
            gh pr comment "$PR_NUM" \
              --repo ${{ github.repository }} \
              --body "✅ **Version check complete** - All packages are up to date!"
            exit 0
          fi

          # Format results
          RESULTS="| Package | Current | Upstream |
          |---------|---------|----------|"

          while read -r line; do
            pkg=$(echo "$line" | jq -r '.pkg')
            current=$(echo "$line" | jq -r '.current_version')
            upstream=$(echo "$line" | jq -r '.upstream_version')
            RESULTS="${RESULTS}
          | \`${pkg}\` | ${current} | **${upstream}** |"
          done < <(jq -c '.[]' /tmp/updates.json)

          gh pr comment "$PR_NUM" \
            --repo ${{ github.repository }} \
            --body "## 📦 Version Check Results

          ${RESULTS}

          <sub>Triggered by @${{ github.event.comment.user.login }}</sub>"

      - name: Handle /approve
        if: steps.parse.outputs.command == 'approve'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          PR_NUM="${{ github.event.issue.number }}"
          USER="${{ github.event.comment.user.login }}"
          ASSOC="${{ github.event.comment.author_association }}"

          # Only owners/admins can approve
          if [[ "$ASSOC" != "OWNER" && "$ASSOC" != "MEMBER" ]]; then
            gh pr comment "$PR_NUM" \
              --repo ${{ github.repository }} \
              --body "⚠️ @${USER} Only repository owners/members can use \`/approve\`"
            exit 0
          fi

          # Approve the PR
          gh pr review "$PR_NUM" \
            --repo ${{ github.repository }} \
            --approve \
            --body "✅ Approved via \`/approve\` command by @${USER}"

          gh pr comment "$PR_NUM" \
            --repo ${{ github.repository }} \
            --body "✅ **PR Approved** by @${USER}

          Ready to merge when checks pass."

      - name: Handle unknown command
        if: |
          steps.parse.outputs.command != 'help' &&
          steps.parse.outputs.command != 'build' &&
          steps.parse.outputs.command != 'lint' &&
          steps.parse.outputs.command != 'check' &&
          steps.parse.outputs.command != 'approve'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          COMMAND="${{ steps.parse.outputs.command }}"

          gh pr comment ${{ github.event.issue.number }} \
            --repo ${{ github.repository }} \
            --body "❓ Unknown command: \`/${COMMAND}\`

          Use \`/help\` to see available commands."