The douro cutover to bitspire is being done remotely with a USB stick
and the machine's internal drive is not NixOS, so the stick has to be
the system rather than an installer medium. Give douro the same
run-from-USB shape batm3 already has.
flake.nix
- Lift the batm3-usb module and image post-processing into shared
`usbBootModule` / `mkUsbDiskImage` helpers (distinct nixos-usb/ESP-USB
labels, nofail /boot, no growPartition, autoUpgrade off, ESP relabel).
batm3-usb evaluates to the same fileSystems/upgrade config as before.
- Add `nixosConfigurations.douro-usb` and
`packages.disk-image-douro-usb` on top of douro-installed.
douro.nix
- Blacklist uas and set usbcore.autosuspend=-1, the same bus-drop
hardening batm3.nix carries, so a stick is a reliable boot medium on
the Bay Trail box.
README
- Document the -usb outputs and the flash-with-Etcher, no-installer flow.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
