Re: [PATCH] Make sure /dev/pts/ptmx is world-writable

From: ludo@gnu.org (Ludovic Courtès)
To: "Lluís Batlle i Rossell" <viric@viric.name>
Cc: guix-devel@gnu.org, nix-dev@cs.uu.nl
Subject: Re: [PATCH] Make sure /dev/pts/ptmx is world-writable
Date: Thu, 03 Apr 2014 09:28:07 +0200	[thread overview]
Message-ID: <87ob0ivpmg.fsf@gnu.org> (raw)
In-Reply-To: <20140403065303.GA8658@cubata.homelinux.net> ("Lluís Batlle i Rossell"'s message of "Thu, 3 Apr 2014 08:53:03 +0200")

Hello!

Lluís Batlle i Rossell <viric@viric.name> skribis:

> On Wed, Apr 02, 2014 at 11:41:11PM +0200, Ludovic Courtès wrote:
>> Hello,
>> 
>> While running Python 3’s test suite, we noticed that on some systems
>> /dev/pts/ptmx is created with permissions 0 (that’s the case with my
>> Nixpkgs-originating 3.0.43 kernel, but someone with a Debian-originating
>> 3.10-3 reported not having this problem.)

Actually the doc confirms that:

  https://www.kernel.org/doc/Documentation/filesystems/devpts.txt

>> There’s still the problem that people without
>> CONFIG_DEVPTS_MULTIPLE_INSTANCES=y are screwed (as noted in build.cc),
>> but I don’t see how we could work around it.
>> 
>> Thoughts?
>> 
>> Ludo’.
>
> Usually it's handled with the devpts special mountable device. The
> "ptmxmode" variable handles that. Don't you want to mount that in the
> chroot?

We do want to mount /dev/pts, yes.  What’s the ‘ptmxmode variable’?

Ludo’.
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