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Senior DevOps / SRE [L2] Git Undo, Recovery & History Rewriting Production Scenario [L2]

Q: You have eight messy "WIP" / "fix typo" / "more fixes" commits on your feature branch. Reviewers want to see one clean commit per logical change. How do you reshape the history before opening the PR?

Use interactive rebase. Pick a base (usually where your branch diverged from main):

#Git #Undo, Recovery & History Rewriting #L2 #Version Control #Collaboration #Rebase
🎙️ Candidate Opening & Architectural Context
""When an engineer accidentally creates this branch or commit divergence, I walk them through safe recovery without data loss. The interviewer is testing: Interactive rebase, squash/fixup workflow.. I structure my answer around systematic triage first, root cause analysis second, and permanent remediation third.""
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🛠️ Production Runbook & Step-by-Step Resolution

1️⃣

Initial Diagnostics & Root Cause Analysis

Use interactive rebase. Pick a base (usually where your branch diverged from main):

  • squash (or s) — combine into the previous commit and let you edit the message.
  • fixup (or f) — same but discard this commit's message (great for "fix typo" commits).
  • reword (or r) — keep the commit but rewrite its message.
2️⃣

Remediation & Permanent Safeguards

An editor opens with one line per commit: Change pick to: Save and exit. Git replays the commits according to your plan; resolve any conflicts and git rebase --continue. Force-push your *own* feature branch with --force-with-lease. Never do this on main or any branch others have based work on. Pro tip: as you go, commit with git commit --fixup= and finish with git rebase -i --autosquash — the editor pre-arranges fixups for you.

git rebase -i origin/main
  • drop (or d) — remove the commit entirely.
  • Reorder lines to reorder commits.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: squash (or s) — combine into the previous commit and let you edit the message.."
⚡ 60-Second Elevator Pitch Talking Points
  • squash (or s) — combine into the previous commit and let you edit the message.
  • fixup (or f) — same but discard this commit's message (great for "fix typo" commits).
  • reword (or r) — keep the commit but rewrite its message.
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