From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: ui: Move 'show-manifest-transaction' from (guix profiles).
Date: Wed, 08 Oct 2014 21:55:02 +0200
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In-Reply-To: <87eguiiqzt.fsf@gmail.com> (Alex Kost's message of "Wed, 08 Oct
	2014 18:19:02 +0400")
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To: Alex Kost <alezost@gmail.com>
Cc: guix-devel@gnu.org

Alex Kost <alezost@gmail.com> skribis:

>    ?: 16 [primitive-load-path "guix/profiles" ...]
> In guix/profiles.scm:
>   21: 15 [#<procedure 9776070 ()>]
> In ice-9/boot-9.scm:
> 2951: 14 [define-module* (guix profiles) #:filename ...]
> 2926: 13 [resolve-imports (((guix utils)) ((guix records)) ((guix derivat=
ions)) ...)]
> 2864: 12 [resolve-interface (guix gexp) #:select ...]
> 2789: 11 [#<procedure 944b300 at ice-9/boot-9.scm:2777:4 (name #:optional=
 autoload version #:key ensure)> # ...]
> 3065: 10 [try-module-autoload (guix gexp) #f]
> 2401: 9 [save-module-excursion #<procedure 977a630 at ice-9/boot-9.scm:30=
66:17 ()>]
> 3085: 8 [#<procedure 977a630 at ice-9/boot-9.scm:3066:17 ()>]
> In unknown file:
>    ?: 7 [primitive-load-path "guix/gexp" ...]
> In guix/gexp.scm:
>   19: 6 [#<procedure 97870d0 ()>]
> In ice-9/boot-9.scm:
> 2951: 5 [define-module* (guix gexp) #:filename ...]
> 2926: 4 [resolve-imports ((# # #) (#) (# # #) (#) ...)]
> 2877: 3 [resolve-interface (guix store) #:select ...]
>  768: 2 [for-each #<procedure 96f5640 at ice-9/boot-9.scm:2877:20 (bspec)=
> #]
> 2883: 1 [#<procedure 96f5640 at ice-9/boot-9.scm:2877:20 (bspec)> direct-=
store-path?]
> In unknown file:
>    ?: 0 [scm-error misc-error #f ...]
>
> ERROR: In procedure scm-error:
> ERROR: no binding `direct-store-path?' in module (guix store)

This is another circularity issue.  :-/

There=E2=80=99s:

  (guix store) -> (guix nar) -> (guix ui) -> (guix store) ...

This shouldn=E2=80=99t be a problem, except that occasional uses of #:select
trigger a bug (see <http://bugs.gnu.org/15540>.)

I=E2=80=99ve fiddled a bit on top of your patch, but couldn=E2=80=99t find =
any simple
fix.

However, back to the initial problem, is this a problem if the error
conditions are defined in (guix profiles), which is then imported by
(guix ui)?  This is suboptimal, but this kind of circular reference
shouldn=E2=80=99t cause any troubles.

HTH,
Ludo=E2=80=99.