What is going on with mkIf here?

[Stzx]

Since mkIf is not actually implemented using if, this behavior is justified.

NixOS/nixpkgs/blob/bbebc94fdbe117bd9ddc79b9cf4dd96829240431/lib/modules.nix#L915-L918

These should help you:

https://nixos.org/manual/nixos/stable/#sec-option-definitions-delaying-conditionals

mkIf vs if / then

Hi folks, It’s obvious to me that mkIf makes more sense when I don’t need else: config = { environment.systemPackages = mkIf config.my.custom.opt.installvim [ pkgs.vim ]; } and if / then makes more sense when I do need else: config = { services.resolved.dnssec = if config.my.custom.opt.dnssecforced then "true" else "allow-downgrade"; } or config = { services.resolved = if config.my.custom.opt.resolved then { enable = true; llmnr = "false"; …