From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Sassmannshausen <alex.sassmannshausen@gmail.com>
Subject: Re: [PATCH 0/3] Add a generalized `wrap-language-programs`
Date: Fri, 18 Nov 2016 16:16:25 +0100
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: guix-devel <guix-devel@gnu.org>

Hi Ludo,

Ludovic Courtès writes:

> 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
>> — 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’s why modifying it leads to a full
> rebuild.

That too, makes a whole load of sense.  Thank you for explaining this to
me!

> To test ‘wrap-language-programs’ while avoiding a full rebuild, you
> could for instance add that procedure to (guix build
> python-build-system), in which case you’d have to rebuild “only” Python
> packages (but not Python itself), or you could introduce a new module
> and use that selectively.

Right, that seems absolutely clear now with your explanation above :-)

> I hope this clarifies and helps a bit!

Indeed it does, thank you!

Alex