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From: zimoun <zimon.toutoune@gmail.com>
Subject: Re: New build system: copy-build-system
Date: Mon, 27 Jan 2020 17:17:10 +0100
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To: Pierre Neidhardt <mail@ambrevar.xyz>
Cc: Guix Devel <guix-devel@gnu.org>

On Mon, 27 Jan 2020 at 16:51, Pierre Neidhardt <mail@ambrevar.xyz> wrote:
>
> zimoun <zimon.toutoune@gmail.com> writes:
>
> > And for example, the 'copy-build-system' could:
> >
> >  - fetch the data from an archive, such http://data.astrometry.net or
> > IPFS or Zenodo or <name-it>
> >  - fetch the resulting <hash> of /gnu/store/<hash>-name-version from susbtitutes
>
> Build systems don't fetch data.

I know (isolated blabla). :-)

"The package using the 'copy-build-system'" is a better wording? ;-)

I do not know exactly how a derivation is computed and what is used to
compute the hash used in the store. Ok, first I have to do my
homework. :-)
But one does not want to hash several tens of GB.

Whatever, I just have the feeling that what you are proposing (with
small tweaks) could improve the situation for "large" data set. I do
not know...

Cheers,
simon

ps:
Well, maybe we should work in the same office... it will be easier and
faster than exchanging all these emails and I know yours has an
awesome view :-D