mrnossiom's NixOS and Home Manager configuration

Options

{
	local.flags = {
		onlyCached = true; # bool; dictate if you are to compile pkgs or use cache
	};

	local.fragment."<name>".enable = true; # bool; dictate whether to enable a fragment
}

Structure

• apps: Scripts serving dotfiles purposes
• assets: Media or files that don't fit in Nix files
• home-manager: Home Manager specific
  • fragments: Home Manager configuration fragments
  • options: Home Manager configuration flags
  • profiles: Base Home Manager configurations to build upon (e.g. desktop, minimal)
• lib: Additional custom lib and flake helpers
• modules: modules that fill a missing feature of NixOS or Home Manager
• nixos: NixOS related config
  • hardware/<hostname>.nix: Device-specific settings like settings generated by nixos-generate-config
  • layout/<layout>.nix: Disko disk layouts used by managedDiskLayout (e.g luks-btrfs)
  • fragments: Opinionated NixOS configuration fragments
  • profiles/<profile>.nix: Base system configurations to build upon (e.g. laptop, installer)
• overlays: Just plain Nix overlays
• pkgs: Custom packages either not eligible or missing from repositories
• secrets: agenix encrypted secrets
• templates: Quickstart files for different languages

Quick snippets and guides for myself

Add a new module

• Copy template and replace <name> with module name

   { config
   , lib
   , ... }:
  
   let
   	cfg = config.local.fragment.<name>;
   in
   {
     options.local.fragment."<name>".enable = lib.mkEnableOption ''
       <name> related
  
       Depends on:
   		- [<Condition>] <dependency>: <reason>
   		- ...
     '';
  
     config = lib.mkIf cfg.enable {
   		assertions = [
   			{ assertion = config."<dependency>"; message = "<name> module depends on <dependency>"; }
   		];
  
   		# put the rest of the config down below
   	};
   }

• Add the newly created file to Git.

• Add the new module to the import list in <type>/fragments/default.nix.

• Activate the module in the wanted profile.

Bootstrap lightweight home-manager config

nix run nixpkgs#home-manager -- switch --flake .#lightweight

Add a new device

• Rekey secrets with device root ssh key, and create a session age key.

Make a backup

Pull up your favorite ArchaicBakup disc

• Set environnement variables

  RESTIC_REPOSITORY: /run/media/user/discname/ RESTIC_PASSWORD_FILE: ?

• Initialize repository

   restic init --repo /srv/restic-repo

---

Milo Moisson © 2023-2025