In the following example we will use the package gamboostLSS. Replace this were necessary.
First "download" (clone) existing r-forge repository
mkdir gamboostLSS
cd gamboostLSS
git svn clone svn+ssh://hofner@svn.r-forge.r-project.org/svnroot/gamboostlss .
Check that .git/config has the following entry:
[svn-remote "rforge"]
url = path/or/url/to/svn/repository
fetch = :refs/remotes/r-forge-svn
Rename the master branch:
git branch -m rforge-local
Now create a branch that is supposed to be linked to github:
git checkout -b master
Now create a new repository (here gamboostLSS) on github and push the local branch to this repository:
git remote add origin git@github.com:hofnerb/gamboostLSS.git
git push -u origin master
Now one can rename the local github branch (if desired).
If one has commited one or more changes to the github branch master, one needs to merge this branch with the r-forge branch rforge-local. To do so, one uses
git checkout rforge-local
git merge --squash master
git commit -m "some dummy text"
git commit --amend
The last two lines are only neccessary to get an (almost) empty commit message. Usually, the commit message after a squashmerge is overly rich and lengthy. If the desired commit message is short anyway one can skip the last step and type this message directly instead of "some dummy text".
To finalize the commit, one needs to rebase and dcommit the local r-forge branch:
git svn rebase
git svn dcommit