Pinning packages in modules using flakes

[waffle8946]

You didn’t add it as a module arg at the top of your file, and you also need to pass it in via specialArgs argument to nixosSystem.

Using flake output package in existing service

Name the argset that’s passed to the outputs functon of the consumer flake. Usually people call it inputs but the name doesn’t matter as long as you’re consistent. outputs = inputs @ { Pass the binding into your config via the specialArgs arg of lib.nixosSystem: nixosConfiguratios.FOO = lib.nixosSystem { specialArgs = { inherit inputs; } # ... }; Use that module arg in your config { pkgs, inputs, ... }: { services.caddy.package = inputs.caddy.packages.${pkgs.stdenv.hostPlatfo…