[https://gitlab.com/esr/reposurgeon Reposurgeon] is a tool by Eric Raymond that is for editing version-control repositories. It can be used to migrate from one system to another; like [[Git/migrating_to_git|migrating from Subversion to Git]]. A lot of large software projects <ref>e.g. [http://wiki.blender.org/index.php/Dev:Ref/Proposals/MigrationToGit Blender], [https://wiki.mozilla.org/ReleaseEngineering/How_To/VCSSync Mozilla], [http://esr.ibiblio.org/?p=4071 Network UPS Tools] </ref>have migrated from Subversion to Git, and reposurgeon is one of the few tools that can actually accomplish large migrations.
[https://git.wiki.kernel.org/index.php/InterfacesFrontendsAndTools#Interaction_with_other_Revision_Control_Systems There are many other tools] for importing and even bi-directional interfaces between repositories. However, reposurgeon is probably the best tool for doing large complex migrations.
[http://esr.ibiblio.org/?p=4071 From January 2012]:
<blockquote>One of my requirements was that the user should not have to declare the branch structure!
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Why does reposurgeon generate .gitignore files<ref>http://www.catb.org/~esr/reposurgeon/dvcs-migration-guide.html</ref>? Partly because it converts <code>svn:ignore</code> properties. Partly because some tools ([[git-svn]]) introduce .gitignore files to the svn repo. I also believe it may have to do with empty directory commits.<ref>https://stackoverflow.com/questions/22822020/convert-an-svn-repository-to-git-with-reposurgeon-without-creating-gitignore-fi</ref>
See below for a description of the <code>git filter-branch</code> command
== Examples ==
* http://blog.runtux.com/2014/04/18/233/
* https://github.com/cmusatyalab/coda-git-conversion/blob/master/lwp.lift
== Re-writing history ==
== Other ==
* [https://svn.apache.org/repos/asf/subversion/trunk/contrib/server-side/svncutter/svncutter svncutter] is another tool, written in Python, by Eric Raymond. svncutter is for stream surgery on SVN dump files.* [http://www.catb.org/~esr/reposurgeon/repopuller.html repopuller] comes with reposurgeon, and is a bash script for using <code>svnsync</code> to create a repo 'mirror' that can be used for reposurgery without having to hit the production repository.
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