update_submodules.yml

name: Update Submodules

on:
  workflow_dispatch:
  schedule:
      - cron: '0 2 * * *'
  push:
    branches:
      - main

jobs:
  update-submodules:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          submodules: 'recursive'
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Configure Git
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"

      - name: Update submodules to their latest default branch
        run: |
          echo "Updating submodules..."
          git submodule foreach --recursive '
            git fetch origin
            if git rev-parse --verify origin/main > /dev/null 2>&1; then
              echo "Switching $name ($path) to origin/main"
              git checkout origin/main
            elif git rev-parse --verify origin/master > /dev/null 2>&1; then
              echo "Switching $name ($path) to origin/master"
              git checkout origin/master
            else
              echo "Could not find main or master branch for $name ($path). Submodule not updated."
            fi
          '
          echo "Submodule update process complete."

      - name: Commit and push submodule updates
        run: |
          git add .
          if git diff --staged --quiet; then
            echo "No submodule changes to commit."
          else
            echo "Committing submodule updates..."
            git commit -m "ci: Update submodules to latest default branch (main/master)"
            echo "Pushing changes..."
            git push
          fi