;; This is an operating-system configuration template of a
;; 64-bit minimal system for a Raspberry Pi with an NFS root file-system.

;; It neither installs firmware nor device-tree files for the Raspberry Pi.
;; It just assumes them to be existing in boot/efi in the same way that some
;; UEFI firmware with ACPI data is usually assumed to be existing on PCs.

;; It expects the boot/efi directory to be served via TFTP and the root
;; file-system to be served via NFS. See the grub-efi-netboot-bootloader
;; description in the manual for more details.

(use-modules (gnu)
             (gnu artwork)
             (gnu system nss))
(use-service-modules admin
                     avahi
                     networking
                     ssh)
(use-package-modules certs
                     linux
                     raspberry-pi
                     ssh)

(define-public raspberry-pi-64-nfs-root
  (operating-system
    (host-name "raspberrypi-guix")
    (timezone "Europe/Berlin")
    (bootloader (bootloader-configuration
                 (bootloader grub-efi-bootloader-chain-raspi-64)
                 (targets (list "/boot/efi"))
                 (theme (grub-theme
                         (resolution '(1920 . 1080))
                         (image (file-append
                                 %artwork-repository
                                 "/grub/GuixSD-fully-black-16-9.svg"))))))
    (kernel-arguments '("ip=dhcp"))
    (kernel (customize-linux #:linux linux-libre-arm64-generic
                             #:extra-version "arm64-generic-netboot"
                             #:configs '("CONFIG_NFS_SWAP=y"
                                         "CONFIG_USB_USBNET=y"
                                         "CONFIG_USB_LAN78XX=y"
                                         "CONFIG_USB_NET_SMSC95XX=y")))
    (initrd-modules '())
    (file-systems (cons* (file-system
                           (mount-point "/")
                           (type "nfs")
                           (device ":/export/raspberrypi/guix")
                           (options "addr=10.20.30.40,vers=4.1"))
                         %base-file-systems))
    (swap-devices (list (swap-space
                         (target "/run/swapfile"))))
    (users (cons* (user-account
                   (name "pi")
                   (group "users")
                   (supplementary-groups '("wheel" "netdev" "audio" "video"))
                   (home-directory "/home/pi"))
                  %base-user-accounts))
    (packages (cons* nss-certs
                     openssh
                     %base-packages))
    (services (cons* (service avahi-service-type)
                     (service dhcp-client-service-type)
                     (service ntp-service-type)
                     (service openssh-service-type
                              (openssh-configuration
                               (x11-forwarding? #t)))
                     %base-services))
    (name-service-switch %mdns-host-lookup-nss)))

raspberry-pi-64-nfs-root