Yocto was kinda doing the nix thing for a while before nix existed, but basically by slowly growing the capabilities in an ad-hoc fashion instead of working on

Yocto was kinda doing the nix thing for a while before nix existed, but basically by slowly growing the capabilities in an ad-hoc fashion instead of working on it from first principles. It's resulted in a bit of a mess (it's an unholy mix of a custom functional-ish programming language grown out of a config file format, python, and bash, with a ludicrous capacity for action-at-distance) but there's still not really anything else like it.