From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Differences between container used by "guix build" and "guix
	environment -C -N"
Date: Mon, 19 Jun 2017 10:21:33 +0200
Message-ID: <87k2481j76.fsf@gnu.org>
References: <20170618144350.67710ce2@scratchpost.org>
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In-Reply-To: <20170618144350.67710ce2@scratchpost.org> (Danny Milosavljevic's
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel@gnu.org

Hello,

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> I'm trying to track down the test_process_mask problem in Guix when tryin=
g to test rustc.
>
> For that I did:
>
> (apply attached patch)
> $ guix build --keep-failed rustc # will fail
> $ cd /tmp/guix-build-rustc-1.16.0.drv-0
> $ guix environment -C -N rustc
> $ bash
> $ source environment-variables
> $ cd rustc-1.16.0-src
> $ ./x86_64-unknown-linux-gnu/stage2/test/stdtest-x86_64-unknown-linux-gnu=
 2>&1 |grep test_process_mask
>
> will not fail.
>
> Why does it fail in "guix build", then?

What does the test do?

I tried to document the differences between the container the daemon
creates and the one you get with =E2=80=9Cguix environment -C=E2=80=9D here:

  https://www.gnu.org/software/guix/manual/html_node/Debugging-Build-Failur=
es.html

Essentially it boils down to /bin/sh available in one case and not in
the other, and UID being zero in one case and something else in the
other.  If you add =E2=80=9C-N=E2=80=9D, then of course you have networking=
, which is
not available in the guix-daemon container.

In the end, if you want to be sure what the differences are, you can
compare:

  https://git.savannah.gnu.org/cgit/guix.git/tree/nix/libstore/build.cc#n20=
62
  and
  https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/build/linux-container=
.scm#n209

Hopefully with reepca=E2=80=99s work we can eventually have a single
implementation.  :-)

HTH!

Ludo=E2=80=99.