❄️ My NixOs Configs ❄️

This repository contains my personal Nix configuration for two machines — a laptop and a homelab server. It uses Nix flakes, Home Manager (integrated as a NixOS module), and sops-nix for secrets. Everything is reproducible and deployable with a single command.

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⚡ Screenshots

🖥️ Machines

Host	Machine	CPU	GPU	Role
nixos	HP Victus 15	i5-12450H	RTX 2050	Daily driver laptop (Hyprland + GNOME)
homelab	HP ENVY x360	i5-6200U	Intel HD 520	Home server (Jellyfin, *arr stack, Grafana)

📁 Structure

dotfiles/
├── flake.nix              # Entry point — mkHost helper, one line per host
│
├── hosts/                 # Per-machine config (ONLY host-specific stuff)
│   ├── nixos/             # Laptop — boot, audio, docker, LAMP, battery
│   └── homelab/           # Server — lid ignore, SSH, transcoding, firewall
│
├── modules/               # Shared & opt-in NixOS modules
│   ├── base.nix           # Applied to ALL hosts (timezone, locale, git, tailscale)
│   ├── desktop/           # Laptop-only (gnome, kde, hyprland, nvidia)
│   └── server/            # Server-only (docker, jellyfin, monitoring, nginx)
│
├── home/                  # Home Manager config (integrated into nixos-rebuild)
│   ├── default.nix        # Entry point
│   ├── shell.nix          # Zsh, aliases, oh-my-posh
│   ├── programs/          # alacritty, git, neovim, tmux, kitty, yazi
│   ├── wm/hyprland/       # Waybar, mako, scripts, swaync
│   └── themes/            # Prompt theme, wallpapers
│
└── secrets/               # sops-nix encrypted secrets
    ├── sops.nix
    ├── common/
    └── homelab/

⚙️ Usage

Prerequisites

Enable flakes in your system (add to /etc/nixos/configuration.nix):

nix.settings.experimental-features = [ "nix-command" "flakes" ];

Clone & Apply

git clone https://github.com/rahulgotrekiya/nix-configs.git ~/dotfiles
cd ~/dotfiles

Replace the hardware config with your own:

cp /etc/nixos/hardware-configuration.nix hosts/nixos/hardware.nix

Build & apply - one command does everything (system + home-manager):

sudo nixos-rebuild switch --flake .#nixos

For the homelab (remotely via SSH):

nixos-rebuild switch --flake .#homelab --target-host neo@homelab --use-remote-sudo

➕ Adding a New Host

Adding a new machine is a 4-step process:

1. Create the host directory:

mkdir -p hosts/myhost

2. Add hardware config:

# On the target machine:
nixos-generate-config --show-hardware-config > hosts/myhost/hardware.nix

3. Create hosts/myhost/default.nix with only host-specific settings:

{ config, pkgs, meta, ... }:
{
  imports = [ ./hardware.nix ];
  
  # Only what's unique to this host goes here.
  # Shared config (timezone, git, nix settings, tailscale)
  # is automatically applied from modules/base.nix
  
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  system.stateVersion = "24.11";
}

4. Add one entry to flake.nix:

nixosConfigurations = {
  nixos   = mkHost { hostname = "nixos"; homeModule = ./home; };
  homelab = mkHost { hostname = "homelab"; user = "neo"; extraModules = [...]; };
  myhost  = mkHost { hostname = "myhost"; };  # ← just this line
};

Then deploy:

sudo nixos-rebuild switch --flake .#myhost

🔑 Home Manager

Home Manager is integrated as a NixOS module - no separate home-manager switch needed. When you run nixos-rebuild switch, it builds both system config and user environment atomically.

This is configured in flake.nix via the mkHost helper:

mkHost = { hostname, user ? "rahul", homeModule ? null, ... }:
  lib.nixosSystem {
    modules = [
      home-manager.nixosModules.home-manager
      {
        home-manager.useGlobalPkgs = true;
        home-manager.useUserPackages = true;
        home-manager.users.${user} = import homeModule;
      }
    ];
  };

Pass homeModule = ./home; to enable it for a host, or omit it for headless servers.

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Thank you ❤️