From mboxrd@z Thu Jan  1 00:00:00 1970
From: Timothy Sample <samplet@ngyro.com>
Subject: Re: Help defining a trivial package.
Date: Sun, 25 Aug 2019 08:17:37 -0400
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 (Pierre-Henry F.'s message of "Fri, 23 Aug 2019 19:42:56 +0000")
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To: "Pierre-Henry F." <contact@phfrohring.com>
Cc: "help-guix@gnu.org" <help-guix@gnu.org>

Hi Pierre,

"Pierre-Henry F." <contact@phfrohring.com> writes:

> Would someone help defining a trivial package?

Sure!

> Here is an attempt at defining the package (incomplete, does not work) in=
 blog.scm:
>
>     (define-module (blog)
>       #:use-module (guix packages)
>       #:use-module (guix download)
>       #:use-module (guix build-system trivial)
>       #:use-module (guix licenses)
>       #:use-module (gnu packages python))
>
>     (define-public blog
>       (package
>         (name "blog")
>         (version "3")
>         (source
>           (origin
>             (method url-fetch)
>             (uri (string-append "/home/phf/programs/blog/release_" versio=
n ".tar.lz"))
>             (sha256
>               (base32
>                 "1y819b53ksyas6asldysr0r8p73n5i8ipbpmbgjrfx8qz8cy2zsx"))))
>         (build-system trivial-build-system)
>         (arguments
>           '(#:builder #~(begin
>                           (mkdir #$output)
>                           (chdir #$output)
>                           ...
>                           )))
>         (inputs `(("python" ,python)))
>         (synopsis "Guix 'hello world' to learn about Guix")
>         (license gpl3+)))
>
> Here is the line that I use to try to build and debug along the way:
>
>     $ guix build --keep-failed --verbosity=3D2 --file=3D./blog.scm
>

As a note for the future, it would be helpful to include the error
message that you saw when things went wrong.  Here, I=E2=80=99m assuming th=
at
Guix said:

    guix build: error: #<unspecified>: not something we can build

Running =E2=80=9Cguix build --file=3DX=E2=80=9D causes Guix to build the la=
st expression
evaluated in the file =E2=80=9CX=E2=80=9D.  In your case, the last expressi=
on that gets
evaluated is the =E2=80=9Cdefine-public=E2=80=9D form, which returns an uns=
pecified
value.

While testing, you can put =E2=80=9Cblog=E2=80=9D at the bottom of the file=
, causing
Guix to build your defined =E2=80=9Cblog=E2=80=9D package.

Hope that helps!


-- Tim