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From: zimoun <zimon.toutoune@gmail.com>
To: Ricardo Wurmus <rekado@elephly.net>, Luis Felipe
 <luis.felipe.la@protonmail.com>
Subject: Re: guix: workflow: command not found
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Date: Fri, 29 Apr 2022 11:11:03 +0200
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Hi Ricardo,

On Tue, 26 Apr 2022 at 20:07, Ricardo Wurmus <rekado@elephly.net> wrote:

>     export GUIX_EXTENSIONS_PATH=3D$HOME/.guix-profile/share/guix/extensio=
ns
>
> Originally I had hoped it would be set automatically due to a search
> path specification on the =E2=80=9Cguix=E2=80=9D package, but this doesn=
=E2=80=99t work as
> intended, so it must be set manually.
>
> I=E2=80=99ll amend the documentation / tutorial.

Some time ago, we had this discussion [1]:

        Let take an example, the recent Ludo=E2=80=99s explorer.

          <https://notabug.org/civodul/guix-explorer/>

        It is easy to transform it as an extension and then use =E2=80=9Cgu=
ix explore=E2=80=9D.

        But 2 things are strict:

         - user side: GUIX_EXTENSIONS_PATH
         - extensioner side: define-module

        Maybe I am wrong and I miss something.  From my understanding,

         - the file must be located at $GUIX_EXTENSIONS_PATH
         - the module must be defined as (guix extension explore)

        because of:

        --8<---------------cut here---------------start------------->8---
            (match (search-path (extension-directories)
                                (format #f "~a.scm" command))
        [...]
               (resolve-interface `(guix extensions ,command)))))
        --8<---------------cut here---------------end--------------->8---

        So, taking the previous example, it would be easy to say: hey, clone
        this, export GUIX_EXTENSIONS_PATH as /path/to/checkout and run =E2=
=80=9Cguix
        explore=E2=80=9D.  But, to work, the repo must have the structure:

         - guix-explorer
           - guix
             - extensions
               - explore.scm

        because the module and in the same time $GUIX_EXTENSIONS_PATH must =
be
        =E2=80=9Cguix-explore/guix/extensions=E2=80=9C.  I feel something i=
s wrong.  And I
        initially proposed to append =E2=80=99/guix/extensions=E2=80=99 by =
default to
        GUIX_EXTENSIONS_PATH in =E2=80=99extension-directories=E2=80=99.

        I do not understand why it should be a problem.

        BTW, for packages as GWL, it does not change.  It is just an agreem=
ent
        between the two sides, right?


        1: <https://yhetil.org/guix/864kimkr96.fsf@gmail.com>

and, from my understanding, the current convention is awkward and I
would prefer the minor tweak I am proposing in Guix side and adjust
accordingly on GWL side.

I would like to document more about extensions because it appears to me
a killer feature but the convention for GUIX_EXTENSIONS_PATH does not
seem nice and once we will communicate about such extension feature, it
will be impossible to change the convention (because backcompatibility).

WDYT?


Cheers,
simon