Git Svn Rebase

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3 min read

Luis Felipe Dias

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A git svn rebase fetches changes from a Subversion server to your machine. It then replays your local Git commits on top of that update. Teams use this workflow during long migrations from Subversion to Git. They let developers work in local Git branches while Subversion stays the main store. When teams grant broad repo permissions, one bad sync can break the trunk. How a git svn rebase syncs your code The bridge between Git and Subversion relies on a clean, linear commit history. Subversion

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A git svn rebase fetches changes from a Subversion server to your machine. It then replays your local Git commits on top of that update. Teams use this workflow during long migrations from Subversion to Git. They let developers work in local Git branches while Subversion stays the main store. When teams grant broad repo permissions, one bad sync can break the trunk.

How a git svn rebase syncs your code

The bridge between Git and Subversion relies on a clean, linear commit history. Subversion does not understand complex Git merge commits or branching graphs. It only knows a flat list of revisions that go in one direction. When you run a git svn rebase, the tool checks the central server first. It pulls down any new revisions that your teammates pushed since your last sync.

Next, the tool rewinds your local work back to the last shared state. It applies the fresh Subversion revisions to your local tracking branch in order. Finally, it replays each of your local Git commits on top one by one. Your local work now sits at the very tip of the history. This makes your branch ready to push back to the central Subversion server.

You must keep your working tree clean before you start this sync step. Unsaved file edits will stop the rewind step from running as expected. Developers usually stash their unfinished edits before they pull from the central server. Once the replay finishes, they pop the stash back onto the updated branch. If two people edit the same lines, you must fix conflicts by hand.

Where native version control roles fall short

Native Subversion and Git setups solve the basic problem of who can log in. Server admins set up directory paths and assign read or write roles to users. These rules stop unknown people from reading code or pushing to restricted folders. Still, repo roles only check user identity at the start of a network session. They do not inspect what individual commands or commits do in flight.

A developer with write permissions can still push broken history or sensitive secrets. If someone runs a standard Git merge before syncing, the history graph splits. Pushing that split graph back to Subversion can drop metadata or confuse the team. Native repo permissions also fail to catch private keys, emails, or card numbers. Once a user authenticates, the server accepts whatever files and actions they send.

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Best practices for safe hybrid sync workflows

Teams that run both systems side by side need strict daily habits. Developers should never use standard Git merge commands on branches linked to Subversion. Every local branch that maps to the central trunk must stay completely flat. You should also avoid sharing local Git branches with other developers directly. All shared code must pass through the central Subversion server first.

Keeping local commits small makes conflict resolution much faster during a sync. If a replay hits a conflict, you fix one small change at a time. Teams also benefit from clear rules on who can push to release paths. Even with good habits, human error can still slip past static server permissions. Controlling actions at runtime is the best way to keep shared systems safe.

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Frequently asked questions

Why should I avoid standard Git merges with Subversion?

Subversion stores history as a flat line and cannot track multiple parent commits. A standard Git merge creates a diamond shape that breaks the Subversion bridge. Replaying your commits keeps the history flat so the central server accepts it.

What happens if a conflict occurs during the sync?

The replay pauses on the exact commit that clashes with the server update. You must open the file, fix the clashing lines, and mark it resolved. Then you tell the tool to continue replaying the rest of your commits.

Can two developers share a local Git branch before pushing to Subversion?

Sharing local branches causes rewritten commit hashes to clash when someone syncs with Subversion. When the server assigns a new revision number, the commit ID changes for everyone. Always push changes through the central Subversion server so everyone gets matching history.

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