soopy.moe
1# "Global"/Extra Options
2a way of passing additional options "globally" to modules is by using extraOpts.
3
4in nix flakes, this is accomplished by using `specialArgs` in `nixosSystem`.
5
6for example, check out these few lines in our flake.nix: [[source]](https://github.com/soopyc/nix-on-koumakan/blob/492dfaa01808c2aa5dbb2d8223163e92bcef673b/flake.nix#L29-L34)
7
8```nix
9# note: unrelated attributes stripped and removed.
10# note2: this code is now out of date from our code, but can still be referenced.
11{
12 outputs = { ... }:{
13 nixosConfigurations = {
14 koumakan = lib.nixosSystem {
15 specialArgs = {
16 _utils = (import ./global/utils.nix) { inherit pkgs; };
17
18 someOtherArg = {thisCanBe = "LiterallyAnything";};
19 };
20 };
21 };
22 };
23}
24```
25
26With this, you can now do this in other imported nixos modules.
27
28```nix
29{ someOtherArg, ... }: {
30 users.users.${someOtherArg} = {};
31}
32```
33
34this avoids the horror of `import ../../../utils/bar.nix;` and various other things.
35
36refer to [nixpkgs:nixos/lib/eval-config.nix] and [nixpkgs:lib/modules.nix#122] for more info
37
38*pointers by \@natsukagami*
39
40[nixpkgs:lib/modules.nix#122]: https://github.com/NixOS/nixpkgs/blob/6e68daefde56a7a8e6fe7c3ca9ceeb436294bb9f/lib/modules.nix#L122
41[nixpkgs:nixos/lib/eval-config.nix]: https://github.com/NixOS/nixpkgs/blob/5054472759a3b0df8e18cfe4031a5eff92d4cdc3/nixos/lib/eval-config.nix