如何在Git多分支的Unity项目中批量更新Unity版本（无需合并或逐个操作）

Great question! Updating multiple Git branches to a new Unity version without merging branches or manually updating each one individually is totally doable with some Git tricks. Here's the most efficient, low-effort workflow I recommend:

Step 1: Prepare the Upgraded Base Branch #

First, get your primary branch (e.g., main or develop) updated to the new Unity version—this will act as the "template" for all other branches:

• Check out your primary branch: git checkout main
• Open the project in your target Unity version via Unity Hub. Let Unity handle all automatic upgrades (this will modify .meta files, Project Settings, and any version-specific assets).
• Verify the project builds and runs correctly to catch any upgrade issues early on.
• Commit all upgrade-related changes with a clear message:

  git add .
  git commit -m "Upgrade project to Unity X.Y.Z (auto-generated version changes)"
  

Step 2: Batch-Rebase All Branches to the Upgraded Base #

Instead of manually checking out each branch and rebasing, use Git's built-in batch commands to automate this process. Run this in your project's Git terminal:

# List all local branches except the main branch, then rebase each onto the upgraded main
git for-each-ref --format='%(refname:short)' refs/heads/ | grep -v "main" | while read branch; do
  echo "Updating branch: $branch"
  git checkout $branch
  git rebase main --autostash
  # If a rebase hits conflicts, resolve them manually then run `git rebase --continue`
  # Add `|| true` to the rebase line to skip problematic branches and finish updating the rest
done

• The --autostash flag saves any uncommitted changes on the branch before rebasing, then restores them afterward—super handy if you have WIP work.
• Conflicts are possible if a branch modifies Unity-specific files (like project settings). Resolve these by keeping the upgraded version from main unless the branch has intentional, version-specific overrides.

Step 3: (Optional) Push Updated Branches to Remote #

Once all branches are rebased locally, push them to your remote repository. Since rebasing rewrites branch history, you’ll need to force-push (use the safer --force-with-lease flag to avoid overwriting remote changes you don’t have locally):

git for-each-ref --format='%(refname:short)' refs/heads/ | grep -v "main" | while read branch; do
  git push origin $branch --force-with-lease
done

Pro Tips to Avoid Headaches #

• Backup First: Before running any batch commands, clone your repository to a backup location (e.g., git clone your-repo-url unity-upgrade-backup) to safeguard against accidental data loss.
• Spot-Check Afterward: After updating all branches, open a few non-primary branches in Unity to confirm they load correctly and basic functionality works.
• Skip Problematic Branches: If a branch has major conflicts that aren’t worth resolving immediately, add || true to the git rebase line in the batch script—this will skip the branch and continue updating the rest.

内容的提问来源于stack exchange，提问作者Levent Alpsal