update-submodules.yml

name: Check Submodule Updates

on:
  schedule:
    # Run daily at midnight
    - cron: '0 0 * * *'
  # Allow manual trigger
  workflow_dispatch:

jobs:
  check-submodule-updates:
    name: Check for submodule updates
    runs-on: ubuntu-latest
    
    permissions:
      contents: write
      pull-requests: write
    
    env:
      PR_BRANCH: submodule-updates
      PR_TITLE: "[chore]: update submodules"

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          # Fetch all history for all branches and tags
          fetch-depth: 0
          # Use SSH key authentication for submodules
          submodules: 'recursive'
          token: ${{ secrets.GH_WORKFLOW_PAT }}

      - name: Set up Git identity
        run: |
          git config --global user.name "jadit19"
          git config --global user.email "jadit19@gmail.com"
      
      - name: Check for existing PR
        id: check_pr
        env:
          GH_TOKEN: ${{ secrets.GH_WORKFLOW_PAT }}
        run: |
          PR_EXISTS=$(gh pr list --head ${{ env.PR_BRANCH }} --state open --json number | jq 'length')
          echo "pr_exists=$PR_EXISTS" >> $GITHUB_OUTPUT
          if [ "$PR_EXISTS" -gt "0" ]; then
            PR_NUMBER=$(gh pr list --head ${{ env.PR_BRANCH }} --state open --json number --jq '.[0].number')
            echo "pr_number=$PR_NUMBER" >> $GITHUB_OUTPUT
          fi

      - name: Check for submodule updates
        id: check_updates
        run: |
          # Initialize all submodules
          git submodule update --init --recursive
          
          # Store current submodule commits
          echo "Current submodule states:" > submodule_changes.txt
          git submodule status >> submodule_changes.txt
          
          # Update all submodules to latest on their respective default branches
          git submodule foreach 'git fetch origin && git checkout $(git rev-parse --abbrev-ref origin/HEAD | sed "s|origin/||") && git pull'
          
          # Check if there are changes
          git status
          if git diff --quiet --exit-code; then
            echo "No submodule updates found"
            echo "has_changes=false" >> $GITHUB_OUTPUT
          else
            echo "Submodule updates found"
            echo "has_changes=true" >> $GITHUB_OUTPUT
            
            # Add the changes to submodule_changes.txt
            echo -e "\n\nUpdated submodule states:" >> submodule_changes.txt
            git submodule status >> submodule_changes.txt
          fi

      - name: Create or update branch
        if: steps.check_updates.outputs.has_changes == 'true'
        run: |
          # Check if the branch already exists locally
          if git rev-parse --verify ${{ env.PR_BRANCH }} >/dev/null 2>&1; then
            git checkout ${{ env.PR_BRANCH }}
            # Ensure the branch is up-to-date with main
            git fetch origin main
            git merge origin/main --no-edit
          else
            # Create a new branch
            git checkout -b ${{ env.PR_BRANCH }}
          fi
          
          # Add and commit changes
          git add lib
          git commit -m "chore: update git submodules to latest version"

      - name: Configure Git to use PAT for push
        if: steps.check_updates.outputs.has_changes == 'true'
        run: |
          git remote set-url origin https://x-access-token:${{ secrets.GH_WORKFLOW_PAT }}@github.com/${{ github.repository }}

      - name: Push changes
        if: steps.check_updates.outputs.has_changes == 'true'
        run: |
          git push -u origin ${{ env.PR_BRANCH }} --force

      - name: Create pull request
        if: steps.check_updates.outputs.has_changes == 'true' && steps.check_pr.outputs.pr_exists == '0'
        env:
          GH_TOKEN: ${{ secrets.GH_WORKFLOW_PAT }}
        run: |
          CHANGES=$(cat submodule_changes.txt)
          PR_BODY="
          ## Submodule Updates

          This PR updates the following git submodules to their latest versions:

          \`\`\`
          ${CHANGES}
          \`\`\`

          *This PR was automatically generated by GitHub Actions.*
          "
          
          gh pr create --base main --head ${{ env.PR_BRANCH }} --title "${{ env.PR_TITLE }}" --body "$PR_BODY"

      - name: Update existing pull request
        if: steps.check_updates.outputs.has_changes == 'true' && steps.check_pr.outputs.pr_exists != '0'
        env:
          GH_TOKEN: ${{ secrets.GH_WORKFLOW_PAT }}
        run: |
          CHANGES=$(cat submodule_changes.txt)
          PR_BODY="
          ## Submodule Updates

          This PR updates the following git submodules to their latest versions:

          \`\`\`
          ${CHANGES}
          \`\`\`

          *This PR was automatically updated by GitHub Actions on $(date).*
          "
          
          gh pr edit ${{ steps.check_pr.outputs.pr_number }} --body "$PR_BODY"