version control for /etc under *BSD

What turnkey solutions exist to put /etc under version control, under various unices? Turnkey doesn't necessarily mean part of the base install, but the following features would be nice: * hooks into VCS commands to manage metadata (ownership, permissions); * integration with the package manager (run automatically before and after installations, handle upgrades intelligently); * treat upstream file versions as a branch; * a pre-filled ignore list; * support for several underlying VCS (especially distributed ones). I use [etckeeper](http://kitenet.net/~joey/code/etckeeper/) under Debian and derivatives. It has all the above features except that it doesn't keep track of upstream versions. I would like to learn about alternatives, particularly on *BSD.