alexion
e684ac481e
Adopt the convention that a Module's option path mirrors its directory under modules/, with an index file naming the directory's own segment. - Group agent Modules under modules.agents.*: claude-code (whole directory), pi (flattened to a file), skills (renamed from agent-skills), and gitea-axi under an agents/tools/ subgroup. The agents/ and tools/ folders are pure namespace prefixes with no aggregator enable. - Nest hypridle and hyprlock under modules.desktop.hyprland.*, with hyprland.nix as the index, and update the desktop aggregator. - Remove the obsolete example Module. - Record the convention in CONTEXT.md and ADR 0004, and update the neogaia host, the two live CLAUDE.md gotchas, and the skills Module's intentional Enable-convention exception comment.
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NixOS Dotfiles
A single flake that builds every machine the user owns — laptop, desktop, and three servers — from one shared, modular configuration.
Language
Host:
One physical machine the flake builds a NixOS configuration for. Each Host has a directory under hosts/ holding its machine-specific hardware-configuration.nix and its choice of enabled Modules.
Avoid: machine, node, system, box
Module:
A single .nix feature file under modules/ that declares an enable option and the configuration it turns on. Every Module is always imported but stays inert until a Host enables it.
Avoid: component, package, plugin
Skeleton: The flake's plumbing — the Auto-loader, the helper lib, the flake inputs/overlays, and the shared base config — as distinct from the Modules that sit on top of it. Avoid: framework, core, base, scaffolding
Auto-loader:
The lib code that recursively discovers and imports every Module under modules/ (and every Host under hosts/) so new files wire themselves in without manual imports edits.
Avoid: loader, importer, scanner
Enable convention:
The rule that every Module is imported unconditionally and guards its own body with mkIf config.modules.<path>.enable, so a Host reads as a checklist of enable = true flags.
Avoid: feature flag, toggle, opt-in
Namespace convention:
The rule that a Module's option path mirrors its directory path under modules/, so a file's location is its namespace.
A file whose name matches its enclosing directory is that directory's index node, declaring the directory's own segment rather than a doubled one.
A directory with no such file is a pure namespace prefix that carries no aggregate enable.
Avoid: option tree, module path, config key
admin identity: The age identity held only in the operator's password manager, never committed, that is a recipient of every secrets file. It is the recovery path for any wiped machine and the credential that authorizes registering a new host. Avoid: master key, admin key, root key
host identity: The dedicated age key on one machine's encrypted root, generated there and never transmitted, that decrypts that machine's own secrets and the shared file. Deliberately distinct from the machine's SSH host key. Avoid: machine key, node key, host key
secrets file: One sops-encrypted file in the repo, encrypted to the admin identity plus whichever hosts may read it. Either shared across every host or specific to one. Avoid: vault, secret store, keyring
unstable overlay:
The overlay exposing nixpkgs-unstable packages as unstable.<name>, used to pull an individual package fresher than the nixos-unstable base.
Avoid: bleeding-edge, latest
stable overlay:
The overlay exposing the latest stable release (nixos-26.05) as stable.<name>, used to pin an individual package to the rock-solid release from the nixos-unstable base.
Avoid: LTS, release channel