NixOS is an experimental GNU/Linux distribution that aims to improve
the state of the art in system configuration management. In existing
distributions, actions such as upgrades are dangerous: upgrading a
package can cause other packages to break, upgrading an entire system
is much less reliable than reinstalling from scratch, you can’t safely
test what the results of a configuration change will be, you cannot
easily undo changes to the system, and so on. We want to change
that. NixOS has many innovative features:
