Service cow-store has been started.
root@gnu ~# guix system init /mnt/etc/config.scm /mnt
Backtrace:
In guix/ui.scm:
  2166:12 19 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1736:10 18 (with-exception-handler _ _ #:unwind? _ # _)
  1731:15 17 (with-exception-handler #<procedure 7fa08addb690 at ic�> �)
In guix/scripts/system.scm:
   1394:8 16 (_)
In guix/status.scm:
    793:4 15 (call-with-status-report _ _)
In guix/scripts/system.scm:
   1228:4 14 (_)
In ice-9/boot-9.scm:
  1736:10 13 (with-exception-handler _ _ #:unwind? _ # _)
In guix/store.scm:
   636:37 12 (thunk)
   1305:8 11 (call-with-build-handler #<procedure 7fa07a7d56f0 at g�> �)
  2066:24 10 (run-with-store #<store-connection 256.99 7fa07b4cb190> �)
In guix/scripts/system.scm:
  1252:15  9 (_ _)
    807:9  8 (perform-action init #<<image> name: #f format: disk-i�> �)
In gnu/system.scm:
  1316:26  7 (operating-system-bootcfg #<<operating-system> kernel:�> �)
   576:14  6 (operating-system-bootloader-crypto-devices #<<operatin�>)
In unknown file:
           5 (filter #<procedure 7fa07a20d100 at gnu/system.scm:553�> �)
In gnu/system.scm:
   554:26  4 (_ _)
In unknown file:
           3 (filter #<procedure 7fa07a20d0a0 at gnu/system.scm:532�> �)
In gnu/system.scm:
   533:33  2 (_ (#<<file-system> device: "none" mount-point: "/de�> �))
In ice-9/boot-9.scm:
  1669:16  1 (raise-exception _ #:continuable? _)
  1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception: In procedure struct-vtable: Wrong type argument in position 1 (expecting struct): 
(#<<file-system> device: "none" mount-point: "/dev/pts" type: "devpts" flags: () options: "gid=996,mode=620" mount?: #t mount-may-fail?: #f 
needed-for-boot?: #f check?: #f create-mount-point?: #t dependencies: () location: ((line . 407) (column . 2) (filename . 
"gnu/system/file-systems.scm"))> #<<file-system> device: "none" mount-point: "/sys/kernel/debug" type: "debugfs" flags: () options: #f mount?: #t 
mount-may-fail?: #f needed-for-boot?: #f check?: #f create-mount-point?: #t dependencies: () location: ((line . 381) (column . 2) (filename . 
"gnu/system/file-systems.scm"))> #<<file-system> device: "tmpfs" mount-point: "/dev/shm" type: "tmpfs" flags: (no-suid no-dev) options: "size=50%" 
mount?: #t mount-may-fail?: #f needed-for-boot?: #f check?: #f create-mount-point?: #t dependencies: () location: ((line . 418) (column . 2) (filename . 
"gnu/system/file-systems.scm"))> #<<file-system> device: "efivarfs" mount-point: "/sys/firmware/efi/efivars" type: "efivarfs" flags: () options: #f 
mount?: #t mount-may-fail?: #t needed-for-boot?: #f check?: #f create-mount-point?: #f dependencies: () location: ((line . 390) (column . 2) (filename . 
"gnu/system/file-systems.scm"))> #<<file-system> device: "/gnu/store" mount-point: "/gnu/store" type: "none" flags: (read-only bind-mount no-atime) 
options: #f mount?: #t mount-may-fail?: #f needed-for-boot?: #f check?: #f create-mount-point?: #f dependencies: () location: ((line . 431) (column . 2) 
(filename . "gnu/system/file-systems.scm"))>)
root@gnu ~#