From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH 0/1] Help wanted fixing a ruby-minitar bug
Date: Tue, 24 Jan 2017 22:40:20 +0100
Message-ID: <87vat43znf.fsf@gnu.org>
References: <cover.1485287714.git.leo@famulari.name>
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To: Leo Famulari <leo@famulari.name>
Cc: guix-devel@gnu.org

Leo Famulari <leo@famulari.name> skribis:

> I tried using this patch to fix a bug in ruby-minitar, but the build
> fails as shown below. Any ideas?
>
> $ ./pre-inst-env guix build ruby-minitar
> The following derivations will be built:
>    /gnu/store/naprvm320mvzlhv4ciax0436qqm3r8zj-ruby-minitar-0.5.4.drv
>    /gnu/store/vz70g01wln7aflljz65yf425pppcgpjd-minitar-0.5.4.tar.xz.drv
> @ build-started /gnu/store/vz70g01wln7aflljz65yf425pppcgpjd-minitar-0.5.4=
.tar.xz.drv - x86_64-linux /var/log/guix/drvs/vz//70g01wln7aflljz65yf425ppp=
cgpjd-minitar-0.5.4.tar.xz.drv.bz2
> data.tar.gz
> metadata.gz
> source is under 'data.tar.gz'

[...]

>    ?: 0 [chdir "data.tar.gz"]

This is apparently a =E2=80=9Ctarbomb=E2=80=9D: it unpacks more than one fi=
le in $PWD.
The =E2=80=98first-subdirectory=E2=80=99 procedure in gnu-build-system.scm =
is a bit
stupid and takes the first file in $PWD as the directory to cd to.

To work around that, use =E2=80=98url-fetch/tarbomb=E2=80=99.

HTH!

Ludo=E2=80=99.