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: Wed, 15 May 2013 14:11:34 +0200
Message-ID: <8761ykl9xl.fsf@gnu.org>
References: <878v3hgxql.fsf@karetnikov.org>
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In-Reply-To: <878v3hgxql.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Tue, 14 May 2013 23:36:18 +0400")
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: bug-guix@gnu.org

Hello!

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> The game is just a single Perl file.

I think this is a good use case for =E2=80=98trivial-build-system=E2=80=99.

Basically, with =E2=80=98trivial-build-system=E2=80=99, you just pass a Sch=
eme
expression that produces the result.  In your case that would be along
the lines of:

  (begin
    (use-modules (guix build utils))

    (let* ((gh   (assoc-ref %build-inputs "source"))
           (perl (assoc-ref %build-inputs "perl"))
           (out  (assoc-ref %outputs "out"))
           (bin  (string-append out "/bin)))
      (mkdir-p bin)
      (copy-file gh (string-append bin "/gh"))
      (patch-shebang (string-append bin "/gh")
                     (list (string-append perl "/bin")))
      ;; ...
      ))

> What directories should be created in the store?

$out/bin for the program, and $out/share/doc/grue-hunter for the license fi=
le.

> And how can I create such directories?

With the =E2=80=98mkdir=E2=80=99 and =E2=80=98mkdir-p=E2=80=99 procedures.

> I've tried several things:
>
> 1. (zero? (system (format #f "cp -r . ~a" out)))

Avoid calling out to Coreutils.  Guile and the (guix build utils)
provide us with everything we need to do that.

HTH!

Ludo=E2=80=99.