svn2git

svn2git is a tiny utility for migrating projects from Subversion to Git while keeping the trunk, branches and tags where they should be. It uses git-svn to clone an svn repository and does some clean-up to make sure branches and tags are imported in a meaningful way, and that the code checked into master ends up being what's currently in your svn trunk rather than whichever svn branch your last commit was in.

Examples

Say I have this code in svn:

trunk

...

branches

1.x
2.x

tags

1.0.0
1.0.1
1.0.2
1.1.0
2.0.0

git-svn will go through the commit history to build a new git repo. It will import all branches and tags as remote svn branches, whereas what you really want is git-native local branches and git tag objects. So after importing this project I'll get:

$ git branch master $ git branch -a master

1.x
2.x
tags/1.0.0
tags/1.0.1
tags/1.0.2
tags/1.1.0
tags/2.0.0
trunk

$ git tag -l [ empty ]

After svn2git is done with your project, you'll get this instead:

$ git branch * master

1.x
2.x

$ git tag -l

1.0.0
1.0.1
1.0.2
1.1.0
2.0.0

Finally, it makes sure the HEAD of master is the same as the current trunk of the svn repo.

Installation

Make sure you have git installed, then install the gem:

$ sudo apt-get install git-core git-svn
$ sudo gem install nirvdrum-svn2git

Usage

There are a number of ways in which you can create a git repo from an existing svn repo. The differentiating factor is the svn repo layout. Below is an enumerated listing of the varying supported layouts and the proper way to create a git repo from a svn repo in the specified layout.

1. The svn repo is in the standard layout of (trunk, branches, tags) at the root level of the repo.

   $ svn2git https://svn.yoursite.com/path/to/repo --trunk trunk --branches branches --tags tags

2. The svn repo is NOT in standard layout and has only a trunk and tags at the root level of the repo.

   $ svn2git https://svn.yoursite.com/path/to/repo --trunk trunk --tags tags

3. The svn repo is NOT in standard layout and has only a trunk and branches at the root level of the repo.

   $ svn2git https://svn.yoursite.com/path/to/repo --trunk trunk --branches branches

4. The svn repo is NOT in standard layout and has only a trunk at the root level of the repo.

   $ svn2git https://svn.yoursite.com/path/to/repo --trunk trunk

5. The svn repo is NOT in standard layout and has no trunk, branches, or tags at the root level of the repo. Instead the root level of the repo is equivalent to the trunk and there are no tags or branches.

   $ svn2git https://svn.yoursite.com/path/to/repo --rootistrunk

The above will create a git repository in the current directory with the git version of the svn repository. Hence, you need to make a directory that you want your new git repo to exist in, change into it and then run one of the above commands. Note that in the above cases the trunk, branches, tags options are simply folder names relative to the provided repo path. For example if you specified trunk=foo branches=bar and tags=foobar it would be referencing https://svn.yoursite.com/path/to/repo/foo as your trunk, and so on. However, in case 5 it references the root of the repo as trunk.

Authors

To convert all your svn authors to git format, create a file somewhere on your system with the list of conversions to make, one per line, for example:

jcoglan = James Coglan jcoglan@never-you-mind.com stnick = Santa Claus nicholas@lapland.com

Then pass an +authors+ option to +svn2git+ pointing to your file:

svn2git https://repos.com/myproject --authors ~/authors.txt

Alternatively, you can place the authors file into ~/.svn2git/authors and svn2git will load it out of there. This allows you to build up one authors file for all your projects and have it loaded for each repository that you migrate.

Debugging

If you're having problems with converting your repository and you're not sure why, try turning on verbose logging. This will print out more information from the underlying git-svn process.

You can turn on verbose logging with the '-v' or '--verbose' flags, like so:

$ svn2git https://svn.yoursite.com/path/to/repo --verbose