Unlike SVN, git does not used a central repository. This is why git is "distributed" and SVN is "centralized". Although this makes git an extremely powerful system for collaborators, tracking changes between various collaborators can quickly become difficult as multiple forks are created.
Please read the following before working with this code:
First, you will need to tell git about the remote repository:
git remote add kohana git://github.com/kohana/kohana.git
This adds "kohana" as a remote repository that can be pulled from.
git checkout -b kohana/master
This creates a local branch "kohana/master" of the master branch of the "kohana" repository.
Now that you have a remote repository, you can pull changes into your local repository:
git checkout kohana/master
This switches to the previously created "kohana/master" branch.
git pull kohana master
This pulls all of the changes from the remote into the local "kohana/master" branch.
git checkout master
This switches back to your local master branch.
git merge kohana/master
This merges all of the changes in the "kohana/master" branch into your master branch.
git push
This pushes all the merged changes into your local fork. At this point, your fork is now in sync with the origin repository!