Cannot boot GuixSD after system reconfigure

[Roel Janssen <roel@gnu.org>]

[-- Attachment #1: config.scm --]
[-- Type: application/octet-stream, Size: 3053 bytes --]

(use-modules (gnu)
             (gnu system nss)
             (linux-nonfree)
             (gnu packages admin)
             (gnu packages base)
             (gnu packages bootloaders)
             (gnu packages firmware)
             (gnu packages fonts)
             (gnu packages linux)
             (gnu packages ncurses)
             (srfi srfi-1))

(use-service-modules networking ssh desktop xorg databases)
(use-package-modules certs gnome)

(operating-system
  (host-name "antelope")
  (hosts-file (plain-file "hosts" (string-append
                                   (local-host-aliases host-name)
                                   %facebook-host-aliases)))

  (timezone "Europe/Amsterdam")
  (locale "en_US.UTF-8")

  (kernel-arguments (list "modprobe.blacklist=pcspkr"
                          "quiet"
                          "rhgb"
                          "thinkpad_acpi.fan_control=1"))

  (bootloader (grub-configuration
           (grub grub-efi)
           (target "/dev/sda")
           (timeout 2)))

  (file-systems (cons*
                 (file-system
                   (device "/dev/sda2")
                   (mount-point "/boot")
                   (needed-for-boot? #t)
                   (type "ext4"))
                 (file-system
                   (device "/dev/sda1")
                   (mount-point "/boot/efi")
                   (needed-for-boot? #t)
                   (type "vfat"))
                 (file-system
                   (device "/dev/sda3")
                   (mount-point "/")
                   (options "ssd")
                   (type "btrfs"))
                 (file-system
                   (device "tmpfs")
                   (mount-point "/var/guix/temproots")
                   (type "tmpfs"))
                 (file-system
                   (device "tmpfs")
                   (mount-point "/tmp")
                   (type "tmpfs"))
                 %base-file-systems))

  (users (cons (user-account
                (name "roel")
                (password "")
                (comment "")
                (group "users")
                (supplementary-groups
                 '("wheel" "netdev" "kvm" "dialout" "audio" "video" "input"))
                (home-directory "/home/roel"))
               %base-user-accounts))

  (kernel linux-nonfree)
  (firmware (cons* iwlwifi-firmware-non-free ath9k-htc-firmware %base-packages))

  ;; This is where we specify system-wide packages.
  (packages (cons* nss-certs          ; for HTTPS access
                   ncurses            ; for the clear command
                   font-liberation
                   btrfs-progs
                   gnome-keyring
                   %base-packages))

  ;; Add GNOME. Use the "desktop" services, which include the X11 log-in
  ;; service, networking with NetworkManager, and more.
  (services (cons*
             (gnome-desktop-service)
             (rngd-service)
             %desktop-services))

  ;; Allow resolution of '.local' host names with mDNS.
  (name-service-switch %mdns-host-lookup-nss))

[-- Attachment #2: Type: text/plain, Size: 462 bytes --]

Dear Guix,

I 'guix pull'ed commit 228a398 and ran:
  guix system reconfigure /etc/config.scm

It looks like GRUB cannot find my root partition (/dev/sda3).  So, I
suspect that something has changed regarding specifying the partitions (UUIDs?).

I attached 'config.scm'.

Now, the hardest part.. How can I recover?  It doesn't boot the older
generations either, so I now use a Fedora live USB.

Any pointers are appreciated.

Thanks!

Kind regards,
Roel Janssen