Understanding Rebase in Git
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Rebase as an Alternative to Merge in Git: while merging is definitely the easiest and most common way to integrate changes, it's not the only one: "Rebase" is an alternative means of integration.
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Understanding Rebase in Git
- 1. Learn Version Control with Git Understanding “Rebase” in Git
- 2. Re-what? $ git rebase branch-B is neither better nor worse - but different integrates code from one branch into another is an alternative to “git merge”
- 4. Merge merge commit C1 branch-A branch-BC4C2 C3 C5 creates an automatically generated merge commit keeps branch histories separate & only “melts” together with merge commit $ git checkout branch-A $ git merge branch-B
- 5. Rebase creates no additional commits (no merge commit) during integration C1 branch-B branch-A C3C4C2 history of “branch-A” looks like development had never happened in multiple branches $ git checkout branch-A $ git rebase branch-B
- 7. C1 branch-A branch-BC4C2 C3 Rebase in Slow-Motion Example Starting Situation
- 8. Rebase in Slow-Motion Step 1 C1 branch-A branch-BC4C2 C3 all commits on branch-A that happened after the common ancestor commit (C1) are “saved away temporarily”
- 9. Rebase in Slow-Motion Step 2 new commits from branch-B are applied C1 branch-A branch-BC4C2 C3 at this point, both branches look exactly the same
- 10. Rebase in Slow-Motion Step 3 C1 branch-B branch-A C3C4C2 the “temporarily saved away” commits from branch-A are re-applied - but on a new position: on top of the integrated commits from branch-B
- 11. Rebase in Slow-Motion Result history for branch-A looks as if all development had happened on this branch, no relation to branch-B is visible C1 branch-B branch-A C3C4C2
- 12. Attention Rebase Rewrites History! C1 branch-B branch-A C3C4C2 re-applied commits (C3) are effectively new commits (with new SHA-1 IDs) because they were re-based onto a new parent commit (C4) The Golden Rule of Rebasing “Never rebase commits that have already been pushed to a remote repository!”
- 13. Learn Git with our free online book on www.git-tower.com/learn