From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH 0/3] Add a generalized `wrap-language-programs`
Date: Fri, 18 Nov 2016 10:10:41 +0100
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References: <20161116132734.5943-1-alex@pompo.co>
	<582C6035.1070202@crazy-compilers.com> <87d1hunlmy.fsf@gmail.com>
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In-Reply-To: <87d1hunlmy.fsf@gmail.com> (Alex Sassmannshausen's message of
	"Thu, 17 Nov 2016 16:58:45 +0100")
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To: Alex Sassmannshausen <alex.sassmannshausen@gmail.com>
Cc: guix-devel <guix-devel@gnu.org>

Hi Alex,

Alex Sassmannshausen <alex.sassmannshausen@gmail.com> skribis:

>> You may try e.g. scons, pip, sphinx, or youtube-dl.
>
> Hartmut was kind enough to suggest the above python applications to test
> this `wrap-language-programs` patch set against, however I have been
> stuck in "Rebuild the world"-hell for the last day and a half setting up
> testcases.
>
> I end up feeling a bit desesperated and incompetent, as I'm sure it's
> not supposed to be this hard to create an appropriate test scenario here
> =E2=80=94 so I was wondering whether anyone has any pointers in avoiding
> constantly rebuilding the world?

The patch set you posted modifies (guix build utils), which is a module
every single derivation uses.  That=E2=80=99s why modifying it leads to a f=
ull
rebuild.

To test =E2=80=98wrap-language-programs=E2=80=99 while avoiding a full rebu=
ild, you
could for instance add that procedure to (guix build
python-build-system), in which case you=E2=80=99d have to rebuild =E2=80=9C=
only=E2=80=9D Python
packages (but not Python itself), or you could introduce a new module
and use that selectively.

I hope this clarifies and helps a bit!

Ludo=E2=80=99.