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Anish Govind 598a43eace refactor: make hosts declarative and consolidate shared config

- add my.username / my.gaming.enable / my.ai.local.enable options and
  gate optional app modules on them instead of per-host import lists
- move vendor-neutral hardware.graphics into modules/graphical, leaving
  only NVIDIA-specific drivers and env vars in modules/hardware/nvidia
- derive the primary user everywhere from my.username (users, getty,
  home-manager, tmpfiles)
- de-duplicate Hyprland autostart down to a single system loginShellInit
  using the start-hyprland wrapper
- consolidate all nixpkgs overlays into modules/core/nix.nix and use
  final.stdenv.hostPlatform.system
- make the zsh rebuild helper target $(hostname) instead of hardcoded hades
- add nixpkgs follows for nixos-hardware, pi and comfy-ui (single nixpkgs)
- add .gitignore and a nixfmt flake formatter; format all nix files
- remove empty browser.nix/display-configuration.nix and rename
  local_ai.nix -> local-ai.nix
- document the my.* toggles in the README

2026-09-18 23:32:32 -07:00

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NixOS Configs

Reproducible multi-host NixOS + Hyprland ("Silicon Volt") configuration.

Install (new machine)

# Setup disks
nix run --experimental-features "nix-common flakes" github:nix-community/disko -- --mode disko --flake .#hades

# install configs
nixos-install --flake .#hades

# set password
nixos-enter --root /mnt -- passwd anish

Rebuild (existing machine)

rebuild switch   # zsh helper: sudo nixos-rebuild switch --flake ~/NixOS-Configs#<host>

Adding a new host (e.g. a laptop)

Create hosts/<name>/ with default.nix, hardware-configuration.nix, and (optionally) disko.nix. Shared modules (modules/core, modules/graphical, modules/apps) are already pulled in by commonModules in flake.nix — the host only adds its own hardware/disko config.
Register it in flake.nix under nixosConfigurations.
Turn optional features on per machine via the shared my.* options:

# hosts/<name>/default.nix
my = {
  username = "anish";      # default; change for a different primary user
  gaming.enable = false;   # Steam, Gamemode, MangoHud
  ai.local.enable = false; # Ollama, ComfyUI, Open WebUI
};

Declare host-specific displays in hosts/<name>/default.nix:

home-manager.users.anish.volt.monitors = [
  {
    output = "eDP-1";              # or "desc:<panel description>"
    mode = "2880x1800@120Hz";      # or "preferred"
    position = "auto";
    scale = 2;
    vrr = null;                    # optional per-monitor VRR
  }
  { output = ""; mode = "preferred"; position = "auto"; scale = "auto"; } # fallback
];

The volt.monitors default (any output @ preferred) keeps every machine working out of the box; hosts override only what they need. Hosts without an NVIDIA GPU simply don't import modules/hardware/nvidia.nix — all vendor env vars live there, while the vendor-neutral hardware.graphics stack lives in modules/graphical.

Feature toggles (`my.*`)

Optional app modules are always imported (via modules/apps/default.nix) but only activate when a host sets the corresponding flag, so hosts never need to edit import lists:

Option	Enables
`my.username`	Primary user (users, home-manager, getty autologin)
`my.gaming.enable`	Steam, Gamemode, MangoHud
`my.ai.local.enable`	Ollama (CUDA), ComfyUI, Open WebUI

Hardware modules remain explicit imports per host (e.g. modules/hardware/nvidia.nix).

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