Subversion simply lists the username for each commit. Git’s commits have much richer data, but at its simplest, the commit author needs to have a name and email listed. By default the git-svn tool will just list the SVN username in both the author and email fields. But with a little bit of work, you can create a list of all SVN users and what their corresponding Git name and emails are. This list can be used by git-svn to transform plain svn usernames into proper Git committers.

From the root of your local Subversion checkout, run this command:

svn log -q | awk -F '|' '/^r/ {sub("^ ", "", $2); sub(" $", "", $2); print $2" = "$2" <"$2">"}' | sort -u > authors-transform.txt

That will grab all the log messages, pluck out the usernames, eliminate any duplicate usernames, sort the usernames and place them into a “authors-transform.txt” file. Now edit each line in the file. For example, convert:

jwilkins = jwilkins <jwilkins>

into this:

jwilkins = John Albin Wilkins <johnalbin@example.com>

git svn clone [SVN repo URL] --no-metadata -A authors-transform.txt --stdlayout ~/temp

This will do the standard git-svn transformation (using the authors-transform.txt file you created in step 1) and place the git repository in the “~/temp” folder inside your home directory.

If your svn repo was using svn:ignore properties, you can easily convert this to a .gitignore file using:

cd ~/temp
git svn show-ignore > .gitignore
git add .gitignore
git commit -m 'Convert svn:ignore properties to .gitignore.'

First, create a bare repository and make its default branch match svn’s “trunk” branch name.

git init --bare ~/new-bare.git
cd ~/new-bare.git
git symbolic-ref HEAD refs/heads/trunk

Then push the temp repository to the new bare repository.

cd ~/temp
git remote add bare ~/new-bare.git
git config remote.bare.push 'refs/remotes/*:refs/heads/*'
git push bare

You can now safely delete the ~/temp repository.

Your main development branch will be named „trunk“ which matches the name it was in Subversion. You’ll want to rename it to Git’s standard „master“ branch using:

cd ~/new-bare.git
git branch -m trunk master

git-svn makes all of Subversions tags into very-short branches in Git of the form “tags/name”. You’ll want to convert all those branches into actual Git tags using:

cd ~/new-bare.git
git for-each-ref --format='%(refname)' refs/heads/tags |
cut -d / -f 4 |
while read ref
do
  git tag "$ref" "refs/heads/tags/$ref";
  git branch -D "tags/$ref";
done

Final repository is new-bare.git. To publish it using Apache (to be clonable) just run

 git update-server-info

Zdroj: http://john.albin.net/git/convert-subversion-to-git