本人零代码经验，本代码完全用自然语言由 Claude 生成

name: Sync Upstream
on:
  schedule:
    - cron: '0 0 */2 * *'  # 每两天 UTC 0 点同步
  workflow_dispatch:     # 允许手动触发
jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout 代码
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.PAT_TOKEN }}  # 关键授权点，记得设置 token

      - name: 备份工作流文件
        run: |
          mkdir -p /tmp/backup
          cp -f .github/workflows/sync.yml /tmp/backup/sync.yml

      - name: 添加上游仓库
        run: git remote add upstream https://github.com/XXXXXXXX  # 关键地址，记得修改

      - name: 获取上游更新
        run: git fetch upstream

      - name: 检测上游默认分支
        id: upstream-branch
        run: |
          # 获取上游仓库的默认分支
          DEFAULT_BRANCH=$(git remote show upstream | grep "HEAD branch" | sed 's/.*: //')
          echo "default_branch=$DEFAULT_BRANCH" >> $GITHUB_OUTPUT
          echo "上游默认分支: $DEFAULT_BRANCH"

      - name: 硬重置到上游状态
        run: |
          git config --global user.name "GitHub Actions"
          git config --global user.email "actions@github.com"
          git reset --hard upstream/${{ steps.upstream-branch.outputs.default_branch }}

      - name: 恢复工作流文件
        run: |
          mkdir -p .github/workflows/
          cp -f /tmp/backup/sync.yml .github/workflows/sync.yml
          git add .github/workflows/sync.yml
          git diff-index --quiet HEAD || git commit -m "保留自定义同步工作流"

      - name: 获取当前仓库信息
        id: repo-info
        run: |
          REPO_URL=$(git config --get remote.origin.url)
          REPO_URL=${REPO_URL#https://github.com/}
          REPO_URL=${REPO_URL%.git}
          echo "repo_url=$REPO_URL" >> $GITHUB_OUTPUT
          echo "当前仓库: $REPO_URL"

      - name: 检测当前仓库默认分支
        id: local-branch
        run: |
          # 获取当前仓库的默认分支
          DEFAULT_BRANCH=$(git remote show origin | grep "HEAD branch" | sed 's/.*: //')
          echo "default_branch=$DEFAULT_BRANCH" >> $GITHUB_OUTPUT
          echo "当前仓库默认分支: $DEFAULT_BRANCH"

      - name: 强制推送更新
        run: |
          GITHUB_USER=$(echo "${{ steps.repo-info.outputs.repo_url }}" | cut -d'/' -f1)
          REPO_NAME=$(echo "${{ steps.repo-info.outputs.repo_url }}" | cut -d'/' -f2)
          git remote set-url origin https://$GITHUB_USER:${{ secrets.PAT_TOKEN }}@github.com/${{ steps.repo-info.outputs.repo_url }}.git
          git push origin ${{ steps.local-branch.outputs.default_branch }} --force