bug#47007: dcb640f02b broke guix environment --container

[Andreas Enge <andreas@enge.fr>]

Hello,

incidentally I stumbled upon the same problem as Jelle today.

Am Tue, Mar 09, 2021 at 05:17:10PM +0100 schrieb Ludovic Courtès:
> Could you try the attached patch?

It raises an error:
$ ./pre-inst-env guix environment -C --ad-hoc coreutils
Backtrace:
In ice-9/boot-9.scm:
  1736:10 17 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
          16 (apply-smob/0 #<thunk 7f421c659520>)
In ice-9/boot-9.scm:
    718:2 15 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8 14 (_ #(#(#<directory (guile-user) 7f421c65cc80>)))
In guix/ui.scm:
  2164:12 13 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1736:10 12 (with-exception-handler _ _ #:unwind? _ # _)
  1731:15 11 (with-exception-handler #<procedure 7f420c8a2db0 at ic…> …)
  1736:10 10 (with-exception-handler _ _ #:unwind? _ # _)
In guix/store.scm:
   636:37  9 (thunk)
   1305:8  8 (call-with-build-handler _ _)
   1305:8  7 (call-with-build-handler #<procedure 7f420c8a26f0 at g…> …)
In guix/status.scm:
    780:4  6 (call-with-status-report _ _)
In guix/scripts/environment.scm:
   768:14  5 (_)
In guix/store.scm:
  2066:24  4 (run-with-store #<store-connection 256.99 7f420c7448c0> …)
In guix/scripts/environment.scm:
    523:8  3 (_ _)
In gnu/build/linux-container.scm:
   327:16  2 (call-with-container (#<<file-system> device: "none…> …) …)
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 =: Wrong type argument in position 1: "/"

Andreas