OS.nix

Hosts

The flake defines these configurations:

NixOS (nixosConfigurations)

Flake name	System	Host key
nixos-homelab	x86_64-linux	nixos-homelab
nixos-homelab	x86_64-linux	nixos-homelab-lxc
nixos-x86_64	x86_64-linux	nixos-x86_64
nixos-aarch64	aarch64-linux	nixos-aarch64

macOS (darwinConfigurations)

Flake name	System	Host key
darwin-mbp	aarch64-darwin	darwin-mbp

Username and Hostnames

IMPORTANT: The flake includes a placeholder ./local/default.nix, but you must supply your own settings.

Edit ./local/default.nix:

{
  # Your local username
  userName = "your-user";

  # Hostnames for each flake configuration
  hosts = {
    nixos-homelab = "your-homelab-host";
    nixos-homelab-lxc = "your-homelab-lxc-host";
    nixos-x86_64 = "your-nixos-host";
    nixos-aarch64 = "your-arm-host";
    darwin-mbp = "your-mac-hostname";
  };
}

Hardware Configuration (NixOS)

IMPORTANT: Edit or replace the hardware config before rebuilding after a fresh install.

sudo nixos-generate-config --show-hardware-config \
  > hosts/nixos/hardware-configuration.nix
sudo nixos-generate-config --show-hardware-config \
  > hosts/homelab/hardware-configuration.nix

Caveats (NixOS)

• Needs WLR_NO_HARDWARE_CURSORS=1 for proper cursor rendering under Sway in Parallels

Commands

NixOS Rebuild

sudo nixos-rebuild switch --flake .#nixos-homelab
sudo nixos-rebuild switch --flake .#nixos-homelab-lxc
sudo nixos-rebuild switch --flake .#nixos-x86_64
sudo nixos-rebuild switch --flake .#nixos-aarch64

macOS (nix-darwin) Rebuild

From macOS:

sudo darwin-rebuild switch --flake .#darwin-mbp

Garbage Collection / Optimisation

# Delete old generations (system)
sudo nix-env --delete-generations old --profile /nix/var/nix/profiles/system

# Garbage collect
sudo nix-collect-garbage -d

# Optimize store
sudo nix-store --optimise