From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Toward 0.2
Date: Mon, 18 Feb 2013 11:26:34 +0100
Message-ID: <87y5el6hph.fsf@gnu.org>
References: <877gm7f01v.fsf@gnu.org> <87obfigz7g.fsf@karetnikov.org>
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In-Reply-To: <87obfigz7g.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Sun, 17 Feb 2013 20:58:20 -0500")
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: bug-guix@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> I guess that I can implement this one:
>
> ** Add equivalent to Nixpkgs's =E2=80=98wrapProgram=E2=80=99
>
> What's the purpose of 'wrapProgram'?  Could you elaborate?

Here=E2=80=99s an example from the Guile expression in Nixpkgs:

  wrapProgram $out/bin/guile-snarf --prefix PATH : "${gawk}/bin"

What it does is that it renames guile-snarf to .guile-snarf-real, and
makes guile-snarf a wrapper around the real one, like this:

  #!/bin/sh
  export PATH=3D"/nix/store/...-gawk/bin:$PATH"
  exec ./.guile-snarf-real "$@"

This is useful for scripts that expect particular programs to be in
$PATH, for programs that expect particular shared libraries to be in
$LD_LIBRARY_PATH, or modules in $GUILE_LOAD_PATH, etc.

The source for Nixpkgs=E2=80=99s =E2=80=98wrapProgram=E2=80=99 is at:

  https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/setup-hoo=
ks/make-wrapper.sh

In our case, the equivalent would be a procedure in (guix build utils).
The generated wrapper would probably still be a Bash script as above.

Thanks!

Ludo=E2=80=99.