Forksync's counter partner, forkwipe, fully restores from a master branch.

forkwipe.sh

forkwipe () { 
    if [ ! -d ".git" ]; then
        echo "Make sure your in the root of a github repo."
        return
    fi
    if cat .git/config | grep -i -q 'remote "upstream"' .git/config; then
        git fetch upstream
        git checkout master
        git reset --hard upstream/master
        git push origin master --force
        git add .
        git commit -m "forkwipe"
        git push
    else
        echo "please run the following:"
        echo "git remote add upstream git@github.com:username/repo.git"
    fi
}