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[bug#43458] [PATCH] guix: build: Add a hint for unspecified value
From: |
Julien Lepiller |
Subject: |
[bug#43458] [PATCH] guix: build: Add a hint for unspecified value |
Date: |
Wed, 16 Sep 2020 23:40:03 +0200 |
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
Description: Text Data
- [bug#43458] [PATCH] guix: build: Add a hint for unspecified value,
Julien Lepiller <=