NixOS-Config

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Rikki's NixOS Config

NixLang Learning

How to share set / variable between modules

You can seen _module.args or specialArgs as your best solution.

The differents between above is here:

• specialArgs just used in flake.nix

  {
    description = "description";
  
    inputs = {
      
    };
  
    outputs = {
      self,
      nixpkgs,
      ...
    } @ inputs: {
      nixosConfigurations = {
        "<sub-config-name>" = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {inherit inputs;}; # <- here
          modules = [
  
          ];
        };
      };
    };
  }

  In this example, you inherit inputs set as your extra arguments, then all the modules can get variables which in your inputs set.

  You can use below to help your module to get variables:

  {
    self,
    nixpkgs,
    ...
  }: {
  
  }

  Just list variables in the header of file, then your module got it.

• _module.args must be used in an module

  {...} @ upstream: let
    trackerList = import ./aria2-tracker;
  in {
    _module.args = {inherit trackerList;};
    imports = [
    ];
  }

  In this example, we created a variable named trackerList.

  We use _module.args = {inherit trackerList;}; which equal to _module.args.trackerList = trackerList; to expose the variable trackerList to another module.

  If we want to import trackerList, we can simply use the same code in paragraph one.

  extra: If you want to replace specialArgs to _module.args

  You can just use below to achieve your goal.

  {
    description = "description";
  
    inputs = {
      
    };
  
    outputs = {
      self,
      nixpkgs,
      ...
    } @ inputs: {
      nixosConfigurations = {
        "<sub-config-name>" = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          modules = [
            {
              _module.args = {inherit inputs;}; # <- here
            }
          ];
        };
      };
    };
  }

  You can easily find that we created an inline module, and it not against the rules.

• nixos-module-imports-with-arguments

• nixos-flake-and-module-system

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