Nix Profile GC

Clean up old profiles more carefully than nix-collect-garbage --delete-older-than

This module removes most old profiles, but makes sure to keep around the last few profiles that served this machine well – profiles this machine ran on for a (configurable) time – even if they’re old.

This is a NixOS Module rather than a stand-alone tool because it determines which extra profiles need preserving by periodically logging the currently-active profiles.

See also: Announcement