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alexion 451c02f798 Build the Skeleton and a minimal neogaia Host

Stand up the walking skeleton the rest of the laptop MVI extends and
re-verifies against: the whole neogaia Host evaluates and its system
toplevel builds (nix flake check green).

- flake.nix: hand-rolled flake (no flake-parts). Base nixos-unstable, plus
  nixpkgs-unstable and nixos-25.05 for the per-package unstable/stable
  overlays, home-manager (nixpkgs followed), and chaotic-nyx (deliberately
  not following our nixpkgs, to keep its binary cache usable). checks build
  each Host toplevel.
- lib/: trimmed helper lib — the Auto-loader (recursive .nix discovery, no
  null-placeholder hack), the host-builder, and the script-from-file helper.
  Deps inherited explicitly; no with lib.my, no nixosModules output.
- system/: shared base config — the unstable/stable overlays, the user
  option (defaults to alexion, in wheel, drives system + home-manager user
  in lockstep), flakes, git, and home-manager as a NixOS module.
- modules/example.nix: Auto-loader / Enable-convention reference Module,
  inert until enabled.
- hosts/neogaia/: minimal laptop Host — placeholder filesystems, bootloader,
  and hardware profile.
- CLAUDE.md: project agent instructions with a Gotchas section (nix on the
  CachyOS dev host, the chaotic overlay/cache behaviour, the forge CLI).

2026-07-19 07:57:21 -04:00

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dotfiles-nixos

One flake that builds every machine the user owns. The domain model (Host, Module, Skeleton, Auto-loader, Enable convention, overlays) lives in .claude/CONTEXT.md; the current deliverable's spec is .claude/spec/laptop-mvi.md.

Gotchas

Nix on the dev host needs experimental features passed per-command. This repo is developed on neogaia while it still runs CachyOS (the migration target), where Nix is the distro package at /usr/bin/nix in multi-user daemon mode. The system /etc/nix/nix.conf does not enable flakes, so export NIX_CONFIG="experimental-features = nix-command flakes" (or pass --extra-experimental-features 'nix-command flakes') for every command.
The dev user is a non-trusted daemon client (nix store info reports Trusted: 0). You cannot add substituters from the CLI, so rely on what the flake/config declares (e.g. the chaotic cache is wired by the chaotic module, not a CLI flag).
If /nix/store is missing or nix-daemon is inactive after a fresh Nix install, initialise it with sudo systemd-tmpfiles --create nix-daemon.conf && sudo systemctl enable --now nix-daemon.socket.
The primary build/verify seam for any Host is nix flake check, which builds checks.x86_64-linux.<host> (the system toplevel); cheap targeted checks use nix eval .#nixosConfigurations.<host>.config....
chaotic-nyx must not follow our nixpkgs, and its packages are built against chaotic's own pinned nixpkgs (its overlay defaults to onTopOf = "flake-nixpkgs", the cache-friendly path). That is what lets the nyx-cache.chaotic.cx binary cache hit instead of compiling the CachyOS kernel from source; the tradeoff is that chaotic packages do not see our unstable/stable overlays.
The remote is self-hosted Gitea (git.alexion.dev); the forge CLI is tea (login axi), and gh is not installed.

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dotfiles-nixos

Gotchas

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