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
parent 906fae7e7b
commit 128deca2e3
61 changed files with 329 additions and 220 deletions
@@ -0,0 +1,48 @@
+# ThinkPad T400 — install notes
+
+Flake host: `lyrathorpe-t400`. Files: `configuration.nix`, the `boot-*.nix`
+variants, and `hardware-configuration.nix`.
+
+## Hardware configuration
+
+`hardware-configuration.nix` here is a hand-written **placeholder**. On the real
+machine, run `nixos-generate-config`, replace the file, and commit it. It assumes
+by-label partitions — root `nixos` (ext4) and `swap` — so either label them at
+install time or swap in the generated UUIDs.
+
+## Bootloader — import the module matching the flashed firmware
+
+`configuration.nix` imports exactly one boot module. Default is `boot-bios.nix`;
+switch by commenting it out and uncommenting the relevant alternative.
+
+| Firmware                                             | Module                   | Notes                                                                                                                                                                                                                                                                                 |
+| ---------------------------------------------------- | ------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Stock Lenovo BIOS, or coreboot + **SeaBIOS** payload | `boot-bios.nix`          | GRUB on the MBR. Set `device` to the real install disk (`/dev/sda` by default). MBR/legacy layout.                                                                                                                                                                                    |
+| coreboot + **GRUB** payload                          | `boot-coreboot-grub.nix` | GRUB is config-only (`device = "nodev"`); NixOS does **not** write to a disk. Your coreboot `grub.cfg` (in the flash chip) must `search` for and `configfile` the on-disk `/boot/grub/grub.cfg`, or chainload the disk's GRUB.                                                        |
+| coreboot + **Tianocore/edk2 (UEFI)** payload         | `boot-coreboot-uefi.nix` | systemd-boot. `canTouchEfiVariables = true` (coreboot honours NVRAM writes). The module **declares its own ESP** (`/boot` vfat, label `ESP`) — when you regenerate `hardware-configuration.nix`, do **not** let it also define `/boot`. Create + label an `ESP` vfat partition (GPT). |
+
+## Graphics
+
+This unit has the optional **discrete ATI Mobility Radeon HD 3470 (RV620)**. The
+open `radeon` KMS driver is loaded in the initrd for early modesetting; firmware
+comes from `enableRedistributableFirmware`.
+
+The T400 has switchable graphics (discrete ATI + Intel GMA 4500MHD). Select
+**Discrete** in the firmware's graphics setting so only the ATI is live. If you
+run **Integrated** instead, the Intel `i915` driver takes over with no config
+change and `radeon` stays idle.
+
+## Login
+
+Graphical login via a Wayland greeter — `greetd` running ReGreet inside the
+`cage` kiosk compositor — configured centrally in `lyrathorpe/swaywm.nix` for
+every Sway host (gated on `features.swayDesktop.enable`). The greeter is forced
+to the Dvorak layout to match the console and Sway session. Set the user
+password (`passwd lyrathorpe`) after install, or the greeter cannot
+authenticate. Requires working radeon/i915 KMS (see Graphics).
+
+## Apply
+
+```sh
+sudo nixos-rebuild switch --flake .#lyrathorpe-t400
+```