Channels

Snowfall Lib makes use of a core package set to build systems, packages, and more. This package set is taken from the input on your flake named nixpkgs. However, it is common to provide additional configuration for NixPkgs before using it. In order to do this, you can use the channels-config option.

{
    inputs = {
        nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";

        snowfall-lib = {
            url = "github:snowfallorg/lib";
            inputs.nixpkgs.follows = "nixpkgs";
        };
    };

    outputs = inputs:
        inputs.snowfall-lib.mkFlake {
            inherit inputs;
            src = ./.;

            # The attribute set specified here will be passed directly to NixPkgs when
            # instantiating the package set.
            channels-config = {
                # Allow unfree packages.
                allowUnfree = true;

                # Allow certain insecure packages
                permittedInsecurePackages = [
                    "firefox-100.0.0"
                ];

                # Additional configuration for specific packages.
                config = {
                    # For example, enable smartcard support in Firefox.
                    firefox.smartcardSupport = true;
                };
            };
        };
}