From owner-freebsd-hackers@FreeBSD.ORG  Thu Jun  7 07:45:29 2012
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id B5D8A106566B;
	Thu,  7 Jun 2012 07:45:29 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id A56D78FC0A;
	Thu,  7 Jun 2012 07:45:28 +0000 (UTC)
Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua
	[212.40.38.100])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id KAA16325;
	Thu, 07 Jun 2012 10:45:27 +0300 (EEST)
	(envelope-from avg@FreeBSD.org)
Received: from localhost ([127.0.0.1])
	by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
	id 1ScXPK-000CVe-Ny; Thu, 07 Jun 2012 10:45:26 +0300
Message-ID: <4FD05C16.9040905@FreeBSD.org>
Date: Thu, 07 Jun 2012 10:45:26 +0300
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
	rv:12.0) Gecko/20120503 Thunderbird/12.0.1
MIME-Version: 1.0
To: freebsd-hackers@FreeBSD.org
X-Enigmail-Version: 1.5pre
Content-Type: text/plain; charset=X-VIET-VPS
Content-Transfer-Encoding: 7bit
Cc: 
Subject: boot menu option to disable graphics mode
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Jun 2012 07:45:29 -0000


It's long been a wish of mine to have an ability to decide at boot time that a
system should boot in "console-only" mode.  That is, that no graphics/X
applications like e.g. xdm/kdm/gdm are automatically started even when they are
configured to do so.

Here is my attempt at implementing that:
https://gitorious.org/~avg/freebsd/avgbsd/commit/96f7051d63d4286ef6f0196d241e7855338a6ed7?format=patch

All the option does at boot time is setting of 'inhibit_gui' variable for kernel
environment.  I envision that this variable could be properly and gracefully
handled in various startup scripts and/or application startup logic.
But to ensure that the option is always honored I've also added "ultimate
protection" to syscons that prohibits KDSETMODE/KD_GRAPHICS ioctl.

What do you think?
-- 
Andriy Gapon