NixOS

NixOS describes system configuration declaratively and builds versioned generations through the Nix package manager. Packages live in isolated store paths, activation is transactional, and a machine can boot an earlier generation after a problematic change. The same configuration is a strong basis for repeatable systems, but it is not by itself proof of bit-for-bit reproducibility: inputs must be pinned, builders must avoid nondeterminism, and mutable application data still needs separate backup and migration controls. Nixpkgs offers stable and fast-moving channels, with a large package set and an ecosystem that rewards learning its language and module model. An OpenFactory browser VM is a disposable place to inspect that model; it does not validate every target machine or external input.

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