etckeeper is a collection of tools to let /etc be stored in a git,
mercurial, darcs, or bzr repository. It hooks into apt (and other package
managers including yum and pacman-g2) to automatically commit changes made
to /etc during package upgrades. It tracks file metadata that revison
control systems do not normally support, but that is important for /etc,
such as the permissions of
/etc/shadow. It's quite modular and
configurable, while also being simple to use if you understand the basics
of working with revision control.
etckeeper now has a website at http://etckeeper.branchable.com/.
New releases will be posted there; please update your RSS subscriptions.