code.google.com ConvertingSvnToGit

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ConvertingSvnToGit  
Moving a project from using Subversion for code hosting to Git 
git Updated Mar 26, 2013 by jasonhall@google.com
Convert your project from Subversion to Git
Follow the following instructions to switch your project from Subversion to Git:

Go to your existing open source project, choose the Administer tab, and then choose the Source sub-tab.
Change the repository type to Git
Import your code into the Git code repository as described in the 'How to Convert Subversion History to Git' section below
In the same manner you imported your code, import your wiki into the Git wiki repository. Make sure to use the path of the wiki in your subversion repository (e.g. http://projectname.googlecode.com/svn/wiki) and the Hg wiki repository (http://code.google.com/p/projectname.wiki/)
Your old Subversion project will still be accessible after you switch your project to using Git, so you will not need to back up your repository before switching. Your Subversion repository will remain accessible at: https://projectname.googlecode.com/svn/

Until you convert your old Subversion data to Git, your new repository and wiki will appear empty. (Don't worry, your old Subversion data is still there, and you can always switch back.)

How to Convert Subversion History to Git
For both of these options, make sure you know your project's clone URL and familiarize yourself with the clone instructions on your project's Source Checkout page. You can get to this page by clicking the "Source" tab, or go directly to https://code.google.com/p/projectname/source/checkout

You won't be using the git clone instructions exactly for this procedure, but you should be using that URL and username/password info.

Option 1: Top-Skimming
If you don't care about your project's history, then you can simply "top skim" the latest trunk code or wiki from Subversion and put it into Git. Assuming your googlecode Git repository is empty, it's as easy as:

  $ git clone https://code.google.com/p/projectname
  $ cd projectname
  $ svn export --force http://projectname.googlecode.com/svn/trunk .
  $ git add .
  $ git commit -m "Initial import of source."
  $ git push origin master
To convert your wiki:

  $ git clone https://code.google.com/p/projectname.wiki
  $ cd projectname.wiki
  $ svn export --force http://projectname.googlecode.com/svn/wiki .
  $ git add .
  $ git commit -m "Initial import of wiki."
  $ git push origin master
Option 2: Full History Conversion
If want to migrate your whole history, the process is much more involved. We will use a tool called git-svn, which is included in standard Git distributions.

The steps below work best if you use the standard Google Code Subversion project layout, with /trunk, /branches, /tags, and /wiki directories.

git-svn is a powerful tool that is capable of much more than the simple history conversion we will go through here. For more information, see the full documentation.

Converting your history can be as simple as cloning the Subversion repo using the svn remote helper:

  $ git svn clone --stdlayout https://projectname.googlecode.com/svn projectname
  $ cd projectname
  $ git remote add googlecode https://code.google.com/p/projectname
  $ git push --all googlecode
If your project has tags, you should also push those. The following will create a simple tag for every tag in the Subversion repo. If you want to create annotated tags, the procedure can be more complicated; see http://gitready.com/advanced/2009/02/16/convert-git-svn-tag-branches-to-real-tags.html for a brief example.

  $ git push googlecode refs/remotes/tags/*:refs/tags/*
To convert your wiki history, use a similar approach (note the .wiki suffix):

  $ git svn clone https://projectname.googlecode.com/svn/wiki projectname.wiki
  $ cd projectname.wiki
  $ git remote add googlecode https://code.google.com/p/projectname.wiki
  $ git push --all googlecode
You're done! If you look at your project's Source or Wiki tabs, you should see your converted repository history.

If you have trouble, feel free to contact google-code-hosting@googlegroups.com