The ghilbert server has a git server built in, so that you can download a copy of the site (both wiki pages and theorems) via git. If you have an account with write access, you can also push changes via git.
To check out the files:
git clone https://ghilbert-app.appspot.com/git/ ghilbert-app
As of early 2013, the above command is likely to time out or (slowly) give an error due to limitations in the ghilbert git server. The workaround is to get a starting git repository from elsewhere, and then you should be able to use normal git commands. For example:
$ git clone git://github.com/jkingdon/ghilbert-app.git $ cd ghilbert-app $ git remote set-url origin https://ghilbert-app.appspot.com/git/ $ git pull
The tar file at https://code.google.com/p/ghilbert/downloads/detail?name=ghilbert-repo-snapshot-20130308a.tar.gz might also be similarly usable.
To be able to push, add the following to .netrc in your home directory:
machine ghilbert-app.appspot.com login USER password PASSWORD
where USER and PASSWORD are the username and password that you use to log in to the wiki.
Once this is done, you should be able to run git push.
Pushing to a local copy of the app is similar, but you will probably need to run the following command once to tell git that it can push large amounts of data:
git config http.postBuffer 524288000
Then pushing to the local app looks like this:
git remote add local http://localhost:8080/git git push local
The first time you push to local you'll likely need to add -f to the git push command.