From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Blog: Guix packaging tutorial
Date: Sun, 30 Sep 2018 21:44:09 +0200
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In-Reply-To: <87o9cex112.fsf@ambrevar.xyz> (Pierre Neidhardt's message of
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To: Pierre Neidhardt <mail@ambrevar.xyz>
Cc: guix-devel <guix-devel@gnu.org>, Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>, guix-blog@gnu.org

Hello,

Pierre Neidhardt <mail@ambrevar.xyz> skribis:

> ludo@gnu.org (Ludovic Court=C3=A8s) writes:
>> I=E2=80=99m not sure what you mean by =E2=80=9Cgenerated in scope=E2=80=
=9D.
>>
>> The =E2=80=98%=E2=80=99 convention is just a convention (and Andy and I =
realized a while
>> back we interpreted the convention differently :-)) so we shouldn=E2=80=
=99t draw
>> too much from that.
>>
>> Regarding =E2=80=98%build-inputs=E2=80=99 and =E2=80=98%outputs=E2=80=99=
, I think it=E2=80=99s enough to say
>> that these are global variables.  Whether they are in scope depends on
>> whether a local variable shadows them.
>>
>> Does that make sense?
>
> I borrowed the expression "generated in scope" from Pjotr's
> https://gitlab.com/pjotrp/guix-notes/blob/master/HACKING.org.
>
> Are they really "global" variables?  My (quick) understanding from
> derivations.scm is that the %-prefixed variables are defined at
> derivation-time.  I think it's important to make this explicit.  What do =
you
> think?

=E2=80=98%build-inputs=E2=80=99 etc. are global variables of package deriva=
tion build
scripts; see =E2=80=98build-expression->derivation=E2=80=99 in (guix deriva=
tions).

To view the code of one of these scripts, open the file returned by:

  $ guix gc --references $(guix build -d coreutils) | grep builder
  /gnu/store/v02xky6f5rvjywd7ficzi5pyibbmk6cq-coreutils-8.29-guile-builder

> ludo@gnu.org (Ludovic Court=C3=A8s) writes:
>> When would you like it to be on line?
>
> Well, as soon as possible :)  Monday 1st, maybe?

Alright, let=E2=80=99s see how far we go; I=E2=80=99ll be AFK most of the d=
ay tomorrow
though, so it might have to be on Tuesday.

Thanks,
Ludo=E2=80=99.