I don’t know if this’ll make it to the author or not, but it’s worth noting here anyway:
This is an excellent way to manage git repositories with ssh keys. The setup is simple and secure, and it allows for management of the git-daemon, gitweb, and read/write access via git+ssh:// .
It’s by far the easiest way to configure your own pile of repositories. I’d think it’d be worth mentioning in the book.