bug#25403: fsck.ext4 not found during boot

[alex.ter.weele@gmail.com]

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Boot of guixSD was interrupted by "In execvp of fsck.ext4: No such file
or directory" followed by a Bourne-like REPL. Entering ",q" allows boot
to continue normally.

This occurred while booting generation 7 (see below). Generation 6
booted normally.

Attached is my operating-system configuration.

bash-4.4$ uname -a
Linux guix 4.8.12-gnu #1 SMP 1 x86_64 GNU/Linux
bash-4.4$ which ext4.fsck
which: no ext4.fsck in
(/home/alex/.guix-profile/bin:/run/setuid-programs:/run/current-system/profile/bin:/run/current-system/profile/sbin)

Generations:
scheme@(guile-user)> (guix-command "system" "list-generations")
Generation 1	Sep 06 2016 22:48:27
  file name: /var/guix/profiles/system-1-link
  canonical file name: /gnu/store/m5c43nhr363j2gsf5js7ryrp50bbdhq8-system
  label: GNU with Linux-Libre 4.7 (beta)
  root device: guix
  kernel: /gnu/store/mbzkpw70jrck9z4hi032vdjff01w02aa-linux-libre-4.7/bzImage
Generation 2	Sep 10 2016 11:32:04
  file name: /var/guix/profiles/system-2-link
  canonical file name: /gnu/store/i2xm3k3vaxacv9pw78740419gn22dzdg-system
  label: GNU with Linux-Libre 4.7.2 (beta)
  root device: guix
  kernel: /gnu/store/1w33nqlw4il84i4xr3pif45insmz82ln-linux-libre-4.7.2/bzImage
Generation 3	Sep 10 2016 11:32:04
  file name: /var/guix/profiles/system-3-link
  canonical file name: /gnu/store/i2xm3k3vaxacv9pw78740419gn22dzdg-system
  label: GNU with Linux-Libre 4.7.2 (beta)
  root device: guix
  kernel: /gnu/store/1w33nqlw4il84i4xr3pif45insmz82ln-linux-libre-4.7.2/bzImage
Generation 4	Sep 10 2016 11:32:04
  file name: /var/guix/profiles/system-4-link
  canonical file name: /gnu/store/i2xm3k3vaxacv9pw78740419gn22dzdg-system
  label: GNU with Linux-Libre 4.7.2 (beta)
  root device: guix
  kernel: /gnu/store/1w33nqlw4il84i4xr3pif45insmz82ln-linux-libre-4.7.2/bzImage
Generation 5	Sep 11 2016 15:17:57
  file name: /var/guix/profiles/system-5-link
  canonical file name: /gnu/store/735jsch2rki7vq6pxp5174hnjzc21v2q-system
  label: GNU with Linux-Libre 4.7.2 (beta)
  root device: guix
  kernel: /gnu/store/1w33nqlw4il84i4xr3pif45insmz82ln-linux-libre-4.7.2/bzImage
Generation 6	Sep 16 2016 23:06:18
  file name: /var/guix/profiles/system-6-link
  canonical file name: /gnu/store/6j3kpanxm63ws3nhgp75vgpf30fbaxwj-system
  label: GNU with Linux-Libre 4.7.2 (beta)
  root device: guix
  kernel: /gnu/store/1w33nqlw4il84i4xr3pif45insmz82ln-linux-libre-4.7.2/bzImage
Generation 7	Dec 04 2016 19:58:23	(current)
  file name: /var/guix/profiles/system-7-link
  canonical file name: /gnu/store/0l1ia1vbja1pmlvl5v3w2n0q7w0b5im2-system
  label: GNU with Linux-Libre 4.8.12 (beta)
  root device: guix
  kernel: /gnu/store/90nmdrl491nyhsy7ar1zczvz5wgqlymh-linux-libre-4.8.12/bzImage


[-- Attachment #2: config.scm --]
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;; This is an operating system configuration template
;; for a "desktop" setup without full-blown desktop
;; environments.

(use-modules (gnu)
             (gnu system nss))
(use-service-modules desktop xorg avahi dbus networking)
(use-package-modules wm ratpoison certs suckless emacs guile-wm)

(operating-system
  (host-name "guix")
  (timezone "America/New_York")
  (locale "en_US.UTF-8")

  (bootloader (grub-configuration (device "/dev/sda")))

  (file-systems
   (cons* (file-system
           (type "ext4")
           (mount-point "/home")
           (title 'label)
           (device "home"))
          (file-system
           (device "guix")
           (title 'label)
           (mount-point "/")
           (type "ext4"))
          %base-file-systems))

  (users (cons (user-account
                (name "alex")
                (group "users")
                (supplementary-groups
                 '("wheel" "netdev" "audio" "video" "cdrom"))
                (home-directory "/home/alex"))
               %base-user-accounts))

    (packages (cons* emacs
                     guile-wm
                     ratpoison            ;window managers
                     nss-certs            ;for HTTPS access
                     %base-packages))

  ;; Use the "desktop" services, which include the X11
  ;; log-in service, networking with Wicd, and more.
  ;;(services %desktop-services)
  (services (cons*
             (slim-service)
             (screen-locker-service slock "slock")
             ;; D-Bus
             (avahi-service)
             ;; TODO: connman doesn't work here because it's not a service (just a plain package, I think)
             (wicd-service)
             (udisks-service)
             (upower-service)
             (colord-service)
             (geoclue-service)
             (polkit-service)
             (elogind-service)
             (dbus-service)

             (ntp-service)
             %base-services))

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