Flake Inputs & Outputs¶

flake.nix tracks nixpkgs on nixos-unstable and composes the system from the inputs below. Most *.nix modules pin inputs.nixpkgs.follows = "nixpkgs" to keep a single nixpkgs in the closure.

Inputs¶

Input	Source	Role
`nixpkgs`	`nixos/nixpkgs/nixos-unstable`	Package set
`home-manager`	`nix-community/home-manager`	User environment
`nixos-hardware`	`NixOS/nixos-hardware`	Hardware profiles
`nix-cachyos-kernel`	`xddxdd/nix-cachyos-kernel`	CachyOS kernel overlay (`pinned`)
`impermanence`	`nix-community/impermanence`	Ephemeral root / `/persist`
`lanzaboote`	`nix-community/lanzaboote`	UEFI Secure Boot
`microvm`	`astro/microvm.nix`	Isolated VM guests
`quickshell`	`git.outfoxxed.me/outfoxxed/quickshell`	Qt6/QML desktop shell
`lix-module`	`git.lix.systems/.../nixos-module`	Lix daemon (+ `lix` input)
`sops-nix`	`Mic92/sops-nix`	Encrypted secrets
`volinit`	`lowcache/volinit`	Shell welcome banner
`nur`	`nix-community/NUR`	Community overlay
`llm-agents`	`numtide/llm-agents.nix`	AI agent tooling overlay

Overlays¶

Applied in flake.nix:

nixpkgs.overlays = [
  inputs.nix-cachyos-kernel.overlays.pinned   # volnix only
  inputs.nur.overlays.default
  inputs.llm-agents.overlays.default
];

Outputs¶

graph TD
    F["flake.nix"] --> V["nixosConfigurations.volnix"]
    F --> L["nixosConfigurations.limbo"]
    F --> NG["packages.x86_64-linux.net-gate"]
    F --> TS["packages.x86_64-linux.tailscale-vm"]
    V --> HM["home-manager.users.lowcache → ./home"]
    L --> HM2["home-manager.users.inlimbo"]

Output	Description
`nixosConfigurations.volnix`	Primary host (`x86_64-linux`)
`nixosConfigurations.limbo`	Portable generic host (`inlimbo`)
`packages.x86_64-linux.net-gate`	Tor MicroVM runner (`nix run .#net-gate`)
`packages.x86_64-linux.tailscale-vm`	Tailscale MicroVM runner

Both hosts wire Home Manager as a NixOS module with useGlobalPkgs and useUserPackages, passing inputs through extraSpecialArgs.

Maintenance¶

make check            # nix flake check
make update           # nix flake update (all inputs)
make update-nixpkgs   # nix flake update nixpkgs
nix flake update volinit

Lix pinning

lix-module carries an inputs.lix.url override tracking Lix main, built from source. Do not drop the override without re-verifying evaluation. See Architecture.