amarbel-llc/igloo

A small overlay flake on top of upstream NixOS/nixpkgs.

igloo is the workspace's shared Nix build-support layer: it consumes nixpkgs as a flake input and exposes build helpers, pins, and package additions for the amarbel-llc repos that wire it in as their nixpkgs input. It exposes:

legacyPackages.<system> — the upstream pkgs set with the overlay applied (drop-in replacement for consumers that use this flake as their nixpkgs)
overlays.default — composed overlay (pins + amarbel-specific packages)
overlays.amarbelPackages — amarbel-specific package additions only
packages.<system> — curated subset for nix run .#foo ergonomics
checks.<system> — eval coverage for fork-specific packages
lib, nixosModules — re-exported from the underlying nixpkgs

Layout

Path	Contents
`flake.nix`	Inputs and outputs of this overlay flake
`overlays/`	Overlay composition
`overlays/default.nix`	Auto-discovers `pins/` and combines with amarbel-packages
`overlays/amarbel-packages.nix`	amarbel-specific package additions
`overlays/pins/`	One file per upstream package override
`pkgs/build-support/gomod2nix/`	gomod2nix builder library + CLI
`pkgs/build-support/godyn/`	godyn per-package Go builder (graph-driven, see godyn(7))
`pkgs/build-support/bun2nix/`	bun2nix builder library
`pkgs/build-support/fetch-gguf-model/`	GGUF model fetcher
`docs/decisions/`	Architecture Decision Records (ADRs)
`docs/features/`	Feature Design Records (FDRs)
`zz-pocs/`	Proof-of-concept experiments

Using as a consumer

Drop-in (single input)

{
  inputs.nixpkgs.url = "github:amarbel-llc/igloo";
  outputs = { nixpkgs, ... }: {
    packages.x86_64-linux.foo = nixpkgs.legacyPackages.x86_64-linux.claude-code;
  };
}

This is the simplest case. Whatever nixpkgs SHA the overlay flake pins to becomes your nixpkgs.

Override the underlying nixpkgs

If you want to control the upstream nixpkgs version yourself:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
    amarbel.url = "github:amarbel-llc/igloo";
    amarbel.inputs.nixpkgs.follows = "nixpkgs";
  };
  outputs = { nixpkgs, amarbel, ... }: {
    packages.x86_64-linux.foo = amarbel.legacyPackages.x86_64-linux.claude-code;
  };
}

Overlay-only (compose with your own pkgs)

let
  pkgs = import nixpkgs {
    system = "x86_64-linux";
    overlays = [ amarbel.overlays.default ];
    config.allowUnfree = true;
  };
in pkgs.claude-code

History

igloo began as a full fork of NixOS/nixpkgs and was reduced to this overlay flake before being renamed. The pre-rename git history (the fork-era commits) lives in the archived amarbel-llc/nixpkgs repository.

License

See COPYING.