svn2git migration with part of tags and branches

Question

We have an old SVN repo with 30 000 revisions. It contains a projectX with 3 branches with the names branchA, branchB, branchC

The 3 branches exist since revision 20 000.

The setup of our repo is as followed:

https://server/repo/projectX/

branches/
changes/
projects/
releases/
tags/

The branches contain BranchA, branchB and branchC and tags contains a lot of tags. As you can see there is no trunk.

Now we want to migrate all the data (without old branches, tags etc) from the beginning till revision 20 000. and from 20 000 we want to migrate till the end with tags and branches and a trunk (the branchA branch).

This is what I want to do with svn2git.

# svn2git https://server/repo/ProjectX --notrunk --nobranches --notags --revision 0:20000 --metadata

# svn2git https://server/repo/ProjectX --trunk branches/branchA --branches branches --tags tags --revision 22545:HEAD --metadata 

Will this give a right result or is it not done to change the trunk (will maybe mix it up) during an svn2git migration and should I keep --notrunk and decide in git what will be my master? Other input is welcome.

Answer 1

The svn2git tool you use is based on git-svn.

For a one-time migration git-svn is not the right tool for conversions of repositories or parts of repositories. It is a great tool if you want to use Git as frontend for an existing SVN server, but for one-time conversions you should not use git-svn, but svn2git which is much more suited for this use-case.

There are plenty tools called svn2git, the probably best one is the KDE one from https://github.com/svn-all-fast-export/svn2git. I strongly recommend using that svn2git tool. It is the best I know available out there and it is very flexible in what you can do with its rules files.

You will be easily able to configure svn2gits rule file to produce the result you want from your current SVN layout, including any complex histories that might exist.

You can also easily in one run create individual Git repositories for different projects in the same SVN root.

If you are not 100% about the history of your repository, svneverever from http://blog.hartwork.org/?p=763 is a great tool to investigate the history of an SVN repository when migrating it to Git.

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Even though git-svn (or the svn2git you used) is easier to start with, here are some further reasons why using the KDE svn2git instead of git-svn is superior, besides its flexibility:

• the history is rebuilt much better and cleaner by svn2git (if the correct one is used), this is especially the case for more complex histories with branches and merges and so on
• the tags are real tags and not branches in Git
• with git-svn the tags contain an extra empty commit which also makes them not part of the branches, so a normal fetch will not get them until you give --tags to the command as by default only tags pointing to fetched branches are fetched also. With the proper svn2git tags are where they belong
• if you changed layout in SVN you can easily configure this with svn2git, with git-svn you will loose history eventually
• with svn2git you can also split one SVN repository into multiple Git repositories easily
• or combine multiple SVN repositories in the same SVN root into one Git repository easily
• the conversion is a gazillion times faster with the correct svn2git than with git-svn

You see, there are many reasons why git-svn is worse and the KDE svn2git is superior. :-)