Here is the process I used to migrate a SourceForge CVS repo to Git using cvs2git (latest stable release is here, but IIRC I used the github dev version), which works on both Windows and Linux without any compilation required since it's just Python.
Also, you don't need to own the repo with this method, you can for example migrate SourceForge projects that you don't own (you just need the right to checkout, so this works on any public repo).
How to import from sourceforge CVS to git.
First, you need to download/checkout the cvs repo with the whole history (not just checkout the HEAD/Trunk):
rsync -av rsync://PROJECT.cvs.sourceforge.net/cvsroot/PROJECT/* cvs
then use cvs2git (python script, works on all platforms, no compilation needed):
python cvs2git --blobfile="blob.dat" --dumpfile="dump.dat" --username="username_to_access_repo" --options=cvs2git.options --fallback-encoding utf-8 cvs
this should have generated two files blob and dump containing your whole cvs history. You can open them in a text editor to check that the content seems correct.
then initialize your git repo inside another folder:
mkdir gitexport/
cd gitexport
git init
then load up the exported cvs history onto git:
cat ../{blob,dump}.dat | git fast-import
and then place the git commit cursor at the end of history:
git reset --hard
finally and optionally, you can push to your remote git repository:
git push -u origin master
of course you need before to git remote add origin https://your_repo_url
Note: cvs2git.options is a JSON formatted configuration file for cvs2git where you can specify transforms for various things like author names (so that their nicknames will be automagically transformed to their full name after import). See the documentation here or the included example options file.
