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deepmind.google·6d ago
AI Engineering
Lobsters·Jun 18·5 min read
Updating Stacked Pull Requests with git rebase --onto
TL;DR
When working with stacked pull requests, a common issue arises when a parent commit is modified, leaving child commits pointing to the old parent. To resolve this, the command 'git rebase --onto <newparent> <oldparent>' can be used to update the child commits to point to the new parent.
✦ Why It Matters
Engineers can effectively manage complex commit histories in stacked pull requests using git rebase --onto.
Key Takeaways
- Use git rebase --onto to update child commits' parents.
- Squash commits as requested by reviewers to maintain clarity.
- Employ git push --force-with-lease for safe remote updates.
- Understand commit relationships to avoid confusion in pull requests.
Full Summary
In software development, stacked pull requests are a series of pull requests that depend on each other. When a reviewer requests changes, such as squashing commits, the child commits may still reference the old parent commit, leading to confusion and errors.
The command 'git rebase --onto <newparent> <oldparent>' allows developers to reassign the parent of a commit, ensuring that the commit history reflects the latest changes. This command is particularly useful when the base pull request has undergone significant modifications.
After rebasing, developers should use 'git push --force-with-lease' to safely update the remote repository. This approach helps maintain a clean and accurate commit history, which is crucial for collaboration and code review.
Understanding this technique can significantly streamline the workflow for engineers managing complex pull request scenarios.