---
marp: true
class: invert
paginate: true
footer: "Albert Vala, Filip Kohout, Nix flakes & Nix command"
---
<style>
    @import url('https://fonts.googleapis.com/css2?family=Ubuntu:ital,wght@0,300;0,400;0,500;0,700;1,300;1,400;1,500;1,700&display=swap');
    :root {
        background-color: rgb(10,10,10);
        font-family: Ubuntu, Arial
    }
    h1 {
        color: rgb(87, 175, 246)
    }
    code {
        background-color: rgb(10,10,10)
    }
    header {
        color: rgb(100,100,100)
    }
    footer {
        color: rgb(100,100,100)
    }
</style>

# Nix flakes & Nix command
---
# nix command
* Nove nix cli
---
# Proc zmena?
* Protoze treba nix-shell se nemel pouzivat na nix-shell -p
* Flake support
---
# Porovnani
```shell
nix-shell -p cowsay nix shell nixpkgs#cowsay
```
nix eval
nix why-depends

---
# Flakes
## Why tho?
* Lockfiles.
* Flake inputs
---
# Na co flaku pouzit?
---
# 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;
          }
        ];
      };
    };
  };
}
```