bug#50978: "guix home describe" backtraces if "guix home" hasn't been used

[Xinglu Chen]

On Sat, Oct 02 2021, Maxime Devos wrote:

> Hi,
>
> When running "guix home describe" before "guix home import"
> and before "guix build":
>
> $ guix home  describe
> Backtrace:
>            7 (primitive-load "/home/[...]/.config/guix/current/b…")
> In guix/ui.scm:
>    2185:7  6 (run-guix . _)
>   2148:10  5 (run-guix-command _ . _)
> In ice-9/boot-9.scm:
>   1752:10  4 (with-exception-handler _ _ #:unwind? _ # _)
> In guix/status.scm:
>     820:3  3 (_)
>     800:4  2 (call-with-status-report _ _)
> In guix/scripts/home.scm:
>     263:8  1 (_)
> In ice-9/boot-9.scm:
>   1685:16  0 (raise-exception _ #:continuable? _)
>
> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> no home environment generation, nothing to describe~%
>
> I don't think a backtrace is needed here.

This seems to be the case for ‘guix system describe’ too

--8<---------------cut here---------------start------------->8---
$ guix system describe
Backtrace:
           7 (primitive-load "/home/yoctocell/.config/guix/current/bin/guix")
In guix/ui.scm:
   2185:7  6 (run-guix . _)
  2148:10  5 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1752:10  4 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
In guix/status.scm:
    820:3  3 (_)
    800:4  2 (call-with-status-report _ _)
In guix/scripts/system.scm:
   1310:8  1 (_)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
no system generation, nothing to describe~%
--8<---------------cut here---------------end--------------->8---

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