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nixfiles/hosts/T400/configuration.nix
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lyrathorpeandEmma Thorpe 128deca2e3
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refactor(flake): user registry, multi-user hosts, and portable home outputs (#49)
## Summary

Separates user identity (data) from the reusable Nix modules and lets a host declare any number of users, replacing the previous one-user-per-host structure. Also restructures the tree and exposes the home config for use off these hosts.

## Changes

- **User registry** (`users/registry.nix`): per-user identity (name, email, groups, authorized + signing keys) as the single source of truth; no user data hardcoded in modules.
- **Multi-user `mkHost`**: a host declares a `users` set keyed by username; per-user identity is injected into each home config via the `identity` module arg.
- **Restructured layout**: `users/`, `home/`, `modules/`, `hosts/`, `lib/` replace the former `lyrathorpe/` and `system/` trees.
- **Portable outputs**: standalone `homeConfigurations."<user>@<system>"` (the portable subset — shell, git, editor, claude) plus an exported `homeModules` for use on machines not managed by this flake, or as an input to other flakes.
- Docs (`README.md`, `home/README.md`) and `.gitignore` updated for the new paths.

## Fixes

- Closes #46 — shared user module authorized one user's SSH key for every account.
- Closes #47 — git committer identity hardcoded as defaults instead of per-user.
- Closes #48 — EDaaS systemd linger hardcoded to a literal username.

## Verification

- `nix flake check` passes: treefmt, deadnix, statix, pre-commit, and evaluation of all NixOS hosts + Darwin + homeConfigurations.
- Derivation-path comparison vs `main`: `lyrathorpe-mbp` and `emmathorpe-edaas` are byte-identical; `lyrathorpe-t400`, `lyrathorpe-macpro31` and `lyrathorpe-rpi5` differ only by de-duplicating a repeated `authorized_keys` entry (confirmed with nix-diff — no other change).
- Standalone `homeConfigurations."lyrathorpe@x86_64-linux".activationPackage` builds.

## Notes

- `emmathorpe` has no personal authorized key yet (it previously inherited Lyra's key via the bug in #46); the registry entry is intentionally empty — add a real key if SSH login as `emmathorpe` is wanted (moot on the WSL host).
- A two-repo (public dotfiles / private systems) split is deferred by design; this internal restructure is the prerequisite for it.

---------

Co-authored-by: Emma Thorpe <emma.thorpe@citrix.com>
Reviewed-on: #49
2026-06-29 13:06:23 +01:00

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Nix

# ThinkPad T400 (NixOS). Shared laptop options live in ../../modules/laptop.nix;
# only host-specific settings are here. Install notes (boot variants, GPU,
# partitions): see ./README.md.
{ config, ... }:
{
imports = [
./hardware-configuration.nix
# Boot: import exactly ONE, matching the firmware currently flashed.
# Stock Lenovo BIOS and coreboot+SeaBIOS both use boot-bios.nix.
./boot-bios.nix
# ./boot-coreboot-grub.nix # coreboot with the GRUB payload (config-only GRUB)
# ./boot-coreboot-uefi.nix # coreboot with the Tianocore/edk2 UEFI payload
# # (systemd-boot; carries its own ESP mount)
];
networking.hostName = "T400-NixOS";
console.font = "Lat2-Terminus16";
# Low-RAM host (4 GiB max): a compressed RAM swap reduces disk paging.
zramSwap.enable = true;
# This host accepts SSH, so open 22 (the firewall itself is enabled in
# laptop.nix with a default-deny policy).
services.openssh.enable = true;
networking.firewall.allowedTCPPorts = [ 22 ];
# Intel Core 2 (Penryn) microcode. Redistributable firmware (enabled in
# workstation.nix) supplies the iwlwifi blobs (Intel WiFi Link 5100/5300) and
# the radeon firmware needed by the discrete GPU below.
hardware.cpu.intel.updateMicrocode = true;
# Battery longevity: cap charging to 75-80%. tlp itself comes from the
# nixos-hardware lenovo-thinkpad profile; tp_smapi supplies the threshold
# sysfs on this 2008-era ThinkPad (kernel-native natacpi is too new for it).
boot.kernelModules = [ "tp_smapi" ];
boot.extraModulePackages = [ config.boot.kernelPackages.tp_smapi ];
services.tlp.settings = {
START_CHARGE_THRESH_BAT0 = 75;
STOP_CHARGE_THRESH_BAT0 = 80;
};
# This T400 has the optional discrete GPU fitted: an ATI Mobility Radeon HD
# 3470 (RV620), driven by the open `radeon` KMS driver. Load it in the initrd
# for early modesetting (clean Sway/Wayland start); firmware comes from
# enableRedistributableFirmware above.
#
# The T400 has switchable graphics (this discrete GPU + the Intel GMA
# 4500MHD). Select "Discrete" in the firmware's graphics setting so only the
# ATI is live; if you instead run "Integrated", the Intel i915 driver takes
# over with no extra config and `radeon` simply stays idle.
boot.initrd.kernelModules = [ "radeon" ];
# See `man configuration.nix` / the stateVersion docs before changing.
system.stateVersion = "26.05";
}