From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Grue Hunter: Can't create directories in the store
Date: Thu, 16 May 2013 18:33:37 +0200
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References: <878v3hgxql.fsf@karetnikov.org> <8761ykl9xl.fsf@gnu.org>
	<87fvxn3b51.fsf@karetnikov.org>
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In-Reply-To: <87fvxn3b51.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Thu, 16 May 2013 06:35:06 +0400")
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: bug-guix@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

>>    (let* ((gh   (assoc-ref %build-inputs "source"))
>
> What is the associated value here?  I assume it should be 'gh.pl'.

Yes.  Actually, =E2=80=9Csource=E2=80=9D is the name of the input that corr=
esponds to
the =E2=80=98source=E2=80=99 field of the package.  So, if your package does

  (package
    (source (origin (... (uri ".../gh.pl"))))
    ...)

then in the builder, (assoc-ref %build-inputs "source") will be
/nix/store/...-gh.pl.

> I guess I'm missing something because you said that "Guile and the (guix
> build utils) provide us with everything we need."

I meant they provide procedures equivalent in functionality to
Coreutils, Findutils, and sed.

> Also, why is it necessary to specify (guix build utils) in #:modules and
> import it via 'use-modules' in #:builder too?  According to the manual,
> all arguments are passed to the build system.

(guix build utils) is not a standard Guile module, so if your build
script wants to use it, it needs to be made available in the chroot
where that build script is run.  That=E2=80=99s what the #:module argument =
does.

Then =E2=80=98use-modules=E2=80=99 does the actual import.

HTH,
Ludo=E2=80=99.