NixOS configuration

Flake-based NixOS + home-manager configuration for this desktop.

Layout

flake.nix                        # entrypoint; pins nixpkgs + home-manager
hosts/
  pc-mans/                       # one directory per machine
    default.nix                  # host-specific (hostname, stateVersion, host LUKS)
    hardware-configuration.nix   # generated, host-specific; do not edit by hand
modules/
  system/                        # NixOS modules (system-wide concerns)
    default.nix                  # imports the rest
    boot.nix
    locale.nix
    networking.nix
    nix.nix                      # flakes, gc, registry, allowUnfree
    hardware-amd.nix             # AMD CPU microcode + amdgpu/Mesa/Vulkan
    audio.nix                    # PipeWire
    fonts.nix
    sway.nix                     # programs.sway, SDDM, portals, polkit
    users.nix
    packages.nix                 # system-wide packages
  home/                          # home-manager modules (per-user concerns)
    default.nix
    sway.nix                     # keybinds, bar, idle, lock, notifications
    shell.nix                    # bash, tmux, direnv, fzf, eza, bat
    git.nix
    packages.nix
home/
  mans.nix                       # home-manager entry for user `mans`

First-time switch

The current system still boots from /etc/nixos/configuration.nix. To switch to this flake-managed config:

# Sanity-check the build first (does not activate):
sudo nixos-rebuild build --flake ~/nixos#pc-mans

# Activate for this boot only (reverts on reboot):
sudo nixos-rebuild test --flake ~/nixos#pc-mans

# Make it the default boot entry:
sudo nixos-rebuild switch --flake ~/nixos#pc-mans

Once the switch succeeds you can ignore /etc/nixos/ entirely. (Removing it is fine; the flake doesn't read from there.)

Day-to-day

nrs                              # alias: rebuild switch
nrt                              # alias: rebuild test
nfu                              # alias: flake update

Or the long forms:

sudo nixos-rebuild switch --flake ~/nixos#pc-mans
nix flake update ~/nixos

Updating inputs

nix flake update ~/nixos          # bumps nixpkgs + home-manager
sudo nixos-rebuild switch --flake ~/nixos#pc-mans

To roll back if something breaks:

sudo nixos-rebuild switch --rollback

Hardware notes

CPU: AMD Ryzen 9 9950X3D (Zen 5). Microcode updates enabled via hardware.cpu.amd.updateMicrocode.
GPU: AMD Radeon RX 9070 (RDNA 4, Navi 48). Requires recent kernel + Mesa; we use boot.kernelPackages = pkgs.linuxPackages_latest and Mesa from nixos-25.11. Both RADV (Mesa) and AMDVLK are installed; RADV is the default.
iGPU: Granite Ridge integrated graphics on the 9950X3D. Same amdgpu driver, no extra config.
WiFi: Qualcomm WCN785x (FastConnect 7800 / Wi-Fi 7). Firmware ships in linux-firmware which is pulled in by hardware.enableRedistributableFirmware.
Ethernet: Realtek RTL8126 (5GbE). Handled by the in-tree r8169 driver.

Adding a new host

mkdir hosts/<name> and copy hosts/pc-mans/default.nix as a starting point.
Drop hardware-configuration.nix from nixos-generate-config into it.
Add a nixosConfigurations.<name> entry to flake.nix.

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