submodule-sync.yml

name: Submodule Sync

on:
  repository_dispatch:
    types: [loong-megatron-submodule-updated]
  workflow_dispatch:
    inputs:
      target_branch:
        description: Branch to update in this repository
        required: true
        default: master
      submodule_path:
        description: Submodule path to update
        required: true
        default: third_party/Loong-Megatron
      submodule_branch:
        description: Submodule branch to track
        required: true
        default: loong-main/core_v0.15.0
      submodule_repository:
        description: Optional owner/repo override for fork validation
        required: false
        default: ''

permissions:
  contents: write

concurrency:
  group: submodule-sync-${{ github.event.inputs.target_branch || github.event.client_payload.target_branch || 'master' }}
  cancel-in-progress: false

jobs:
  sync:
    runs-on: ubuntu-latest
    env:
      TARGET_BRANCH: ${{ github.event.inputs.target_branch || github.event.client_payload.target_branch || 'master' }}
      SUBMODULE_PATH: ${{ github.event.inputs.submodule_path || github.event.client_payload.submodule_path || 'third_party/Loong-Megatron' }}
      SUBMODULE_BRANCH: ${{ github.event.inputs.submodule_branch || github.event.client_payload.submodule_branch || 'loong-main/core_v0.15.0' }}
      SUBMODULE_REPOSITORY: ${{ github.event.inputs.submodule_repository || github.event.client_payload.submodule_repository || '' }}
    steps:
      - name: Checkout target branch
        uses: actions/checkout@v4
        with:
          ref: ${{ env.TARGET_BRANCH }}
          token: ${{ github.token }}
          fetch-depth: 0
          submodules: false

      - name: Configure git identity
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

      - name: Update submodule pointer
        id: update
        shell: bash
        run: |
          set -euo pipefail
          git submodule sync -- "$SUBMODULE_PATH"
          if [ -n "$SUBMODULE_REPOSITORY" ]; then
            git config "submodule.$SUBMODULE_PATH.url" "https://github.com/$SUBMODULE_REPOSITORY.git"
          fi
          git submodule update --init -- "$SUBMODULE_PATH"
          git -C "$SUBMODULE_PATH" fetch origin "$SUBMODULE_BRANCH"
          git submodule update --remote -- "$SUBMODULE_PATH"

          if git diff --quiet -- "$SUBMODULE_PATH"; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
            echo "Submodule $SUBMODULE_PATH is already current on $SUBMODULE_BRANCH."
            exit 0
          fi

          echo "changed=true" >> "$GITHUB_OUTPUT"
          echo "New submodule pointer:"
          git diff --submodule=log -- "$SUBMODULE_PATH"

      - name: Commit submodule update
        if: steps.update.outputs.changed == 'true'
        run: |
          git add "$SUBMODULE_PATH"
          git commit -m "[ci] chore: sync Loong-Megatron submodule"

      - name: Push submodule update
        if: steps.update.outputs.changed == 'true'
        run: git push origin "HEAD:$TARGET_BRANCH"