GNU bug report logs - #43458
[PATCH] guix: build: Add a hint for unspecified value

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Julien Lepiller <julien <at> lepiller.eu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#43458: closed ([PATCH] guix: build: Add a hint for
 unspecified value)
Date: Tue, 29 Sep 2020 13:17:02 +0000

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Your message dated Tue, 29 Sep 2020 15:16:05 +0200
with message-id <20200929151605.64af296c <at> tachikoma.lepiller.eu>
and subject line Re: [bug#43458] [PATCH] guix: build: Add a hint for unspecified value
has caused the debbugs.gnu.org bug report #43458,
regarding [PATCH] guix: build: Add a hint for unspecified value
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Julien Lepiller <julien <at> lepiller.eu>
To: guix-patches <at> gnu.org
Subject: [PATCH] guix: build: Add a hint for unspecified value
Date: Wed, 16 Sep 2020 23:40:03 +0200

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Hi Guix!

this patch adds a hint to guix build, when you try to build from a file
and it returns #<unspecified>.  The most common error is when you copy
the structure from other guix modules and use `define-public` for your
package. The file returns #<unspecified> and you get this message:

> #<unspecified>: not something we can build.

Which is not very helpful. Here is what happens with this change:

> guix build: error: #<unspecified>: not something we can build
> 
> hint: If you build from a file, make sure the last scheme expression
> returns a package value.  `define-public' defines a variable, but
> returns #<unspecified>.  To fix this, add a scheme expression at the
> end of the file that consists only of the package's variable name you
> defined.  ex:
> 
>      (define-public my-package
>        (package
>          ...))
>      
>      my-package

If instead, you return a value that is not understood, the message is
simpler (as this is not something that happens out of confusion / being
new to guix or guile):

> guix build: error: 1: not something we can build
> 
> hint: If you build from a file, make sure the last scheme expression
> returns a package, gexp, derivation value or a list of such values.

(here the file returned "1" which we can't build :))

[0001-guix-build-Add-a-hint-for-unspecified-value.patch (text/x-patch, attachment)]

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From: Julien Lepiller <julien <at> lepiller.eu>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 43458-done <at> debbugs.gnu.org
Subject: Re: [bug#43458] [PATCH] guix: build: Add a hint for unspecified value
Date: Tue, 29 Sep 2020 15:16:05 +0200

Pushed as e75443d4f28ff1aa97e545f2b47b311c3a5ac32a, thanks for the
review!

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