presentation-nix-flakes/prezentace.md

marp	class	paginate	footer
true	invert	true	Albert Vala, Filip Kohout, Nix flakes & Nix command

Nix flakes & Nix command

---

Nix Command

• Nove nix cli
• Flake support

---

Porovnani

nix-shell -p cowsay #Stare
nix shell nixpkgs#cowsay #Nove
nix run nixpkgs#cowsay #Nove

---

Commandy

Command	Na
flake new	Vytvoreni flaky z template
develop	Build environment shell
shell	temp shell s nejakym programem
config check	Check configu na potencialni chyby
run	Spusti output z flaky

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Flakes

Proc?

• Lockfiles.
• Flake inputs

Na co?

• Cokoliv.

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Jak pouzit flakes na system configuraci?

• Flake je jen cast zbytek je v normalnich nix filech
• Zbytek konfigurace bere inputy z flaky.
• Neprijdeme o nic jen mame lock file a moznost flake jako inputu

---

Flake example

{
  description = "NixOS configuration";
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
    zen-browser.url = "github:0xc000022070/zen-browser-flake";
  };
  outputs = inputs @ {
    nixpkgs,
    home-manager,
    zen-browser,
    ...
  }: {
    nixosConfigurations = {
      laptop = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./laptop/configuration.nix
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = false;
            home-manager.useUserPackages = true;
            home-manager.extraSpecialArgs = {inherit zen-browser;};
            home-manager.users.albert = import ./modules/home.nix;
          }
        ];
      };
    };
  };
}

---

{
  zen-browser,
  config,
  pkgs,
  ...
}: {
  home.username = "nixFreak";
  home.homeDirectory = "/home/nixFreak";
  home.stateVersion = "24.05";
  home.packages = with pkgs;
    [
      cowsay
    ]
    ++ [
      zen-browser.packages."${system}".default
    ];
  programs.home-manager.enable = true;
}

---

nixos-rebuild

• Je to jen bash script

nix build /etc/nixos#nixosConfigurations.nixos.config.system.build.toplevel \
&& ./result/bin/switch-to-configuration switch