[$] A look at Nix and Guix

Nix andGuix are a pair of unusual package managersbased on the idea of declarative configurations. Their associated Linuxdistributions - NixOS and the Guix System - take the idea further by allowing usersto define a single centralized configuration describing the state of the entiresystem. Both havebeen previously mentioned on LWN, but not covered extensively. They offer different takes onthe central idea of treating packages like immutable values.