Emma Thorpe
10cc6cceed
Separate user identity (data) from the reusable modules, and let a host declare any number of users instead of exactly one. - users/registry.nix: per-user identity (name, email, groups, authorized and signing keys) as the single source of identity; no user data is hardcoded in the modules. - mkHost takes a `users` set keyed by username; per-user identity is injected into each home config via the `identity` module arg (extraSpecialArgs is per-host, so it cannot carry per-user data). - modules/users.nix builds accounts from the registry; modules/ssh.nix no longer defines authorized keys (the registry owns them); home/git.nix and home/desktop.nix read `identity`; users/emmathorpe/work.nix drops its now-redundant git identity override. - Restructure the tree: users/, home/, modules/, hosts/, lib/ replace the former lyrathorpe/ and system/ layout. - Add standalone homeConfigurations (the portable subset: shell, git, editor, claude) and an exported homeModules output for use on machines not managed by this flake, or as an input to other flakes. Behaviour-preserving for existing hosts: lyrathorpe-mbp and emmathorpe-edaas evaluate to identical derivations; lyrathorpe-t400, lyrathorpe-macpro31 and lyrathorpe-rpi5 differ only by de-duplicating a repeated authorized_keys entry. Fixes the SSH authorized-key leak (one user's key was applied to every account), the hardcoded default git identity, and the hardcoded EDaaS linger setting.
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
sudo nixos-rebuild switch --flake .#lyrathorpe-t400