90 lines
1.7 KiB
Markdown
90 lines
1.7 KiB
Markdown
# Modules
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The modules directory is a replica of nixpkg's NixOS [modules][nixpkgs-modules]
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, and follows the same semantics. This allows for trivial upstreaming into
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nixpkgs proper once your module is sufficiently stable.
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All modules linked in _module-list.nix_ are automatically exported via
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`nixosModules.<file-basename>`, and imported into all [hosts](../concepts/hosts.md).
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> ##### _Note:_
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>
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> This is reserved for declaring brand new module options. If you just want to
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> declare a coherent configuration of already existing and related NixOS options
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> , use [profiles](../concepts/profiles.md) instead.
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## Semantics
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In case you've never written a module for nixpkgs before, here is a brief
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outline of the process.
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### Declaration
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modules/services/service-category/my-service.nix:
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```nix
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{ config, lib, ... }:
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let
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cfg = config.services.myService;
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in
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{
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options.services.myService = {
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enable = lib.mkEnableOption "Description of my new service.";
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# additional options ...
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};
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config = lib.mkIf cfg.enable {
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# implementation ...
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};
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}
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```
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### Import
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modules/module-list.nix:
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```nix
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[
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./services/service-category/my-service.nix
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]
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```
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## Usage
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### Internal
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profiles/profile-category/my-profile.nix:
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```nix
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{ ... }:
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{
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services.MyService.enable = true;
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}
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```
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### External
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flake.nix:
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```nix
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{
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# inputs omitted
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outputs = { self, devos, nixpkgs, ... }: {
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nixosConfigurations.myConfig = nixpkgs.lib.nixosSystem {
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system = "...";
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modules = [
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devos.nixosModules.my-service
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({ ... }: {
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services.MyService.enable = true;
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})
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];
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};
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};
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}
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```
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[nixpkgs-modules]: https://github.com/NixOS/nixpkgs/tree/master/nixos/modules
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