In a running NixOS system, how does one get the current value applied to a certain option?
From the running generation, I don’t think you can, unless you’ve set up some method to record the configuration with the generation. Nixos doesn’t do that by default.
From the config as stored in /etc/nixos
, you can do nix-instantiate --eval --expr '(import <nixpkgs/nixos> {}).config.path.to.option'
.
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