From owner-freebsd-virtualization@FreeBSD.ORG  Sun Jan  9 17:08:03 2011
Return-Path: <owner-freebsd-virtualization@FreeBSD.ORG>
Delivered-To: freebsd-virtualization@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 632271065673
	for <freebsd-virtualization@freebsd.org>;
	Sun,  9 Jan 2011 17:08:03 +0000 (UTC)
	(envelope-from jamesbrandongooch@gmail.com)
Received: from mail-wy0-f182.google.com (mail-wy0-f182.google.com
	[74.125.82.182])
	by mx1.freebsd.org (Postfix) with ESMTP id 8192B8FC0C
	for <freebsd-virtualization@freebsd.org>;
	Sun,  9 Jan 2011 17:08:02 +0000 (UTC)
Received: by wyf19 with SMTP id 19so19086242wyf.13
	for <freebsd-virtualization@freebsd.org>;
	Sun, 09 Jan 2011 09:08:00 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:mime-version:received:received:in-reply-to
	:references:date:message-id:subject:from:to:cc:content-type
	:content-transfer-encoding;
	bh=BFgXokITYaOxUsMi0ZDRmXvexagZC2h9joEI8DDRk4w=;
	b=TiaOCvAnJpxCAcBg7Rdlg64EZjDMS05fqzVIYYe/kGc3RYgRRF++ooa1gWP22XCNvG
	0SF6RRMHuWUy69l1fXlPsZ+2a9pZmBWElVvdO4Hymqp4iB/eWhQu+7aO+qDg1ljtU9d+
	SNK4kyQ/23ZUismYTy0wX0YV6+EuPdxV3y1jg=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=mime-version:in-reply-to:references:date:message-id:subject:from:to
	:cc:content-type:content-transfer-encoding;
	b=tGHS0tSzKOArBHvFxXvKNWUGtXqBUz3l8Yx+q3mK3fRZGIHgLigWGrQZtWFSCVRneA
	Fv+/GVK5SGCxV18fyj6gHDOxNUgqOE/2YulX9lerOLdMybHQDcrLc8SdcZcXc5uOLExU
	Jay2EXusj7fCfnOdS6EHQolLrpdLkXqN5G6uQ=
MIME-Version: 1.0
Received: by 10.216.28.8 with SMTP id f8mr14390195wea.48.1294589125974; Sun,
	09 Jan 2011 08:05:25 -0800 (PST)
Received: by 10.216.36.71 with HTTP; Sun, 9 Jan 2011 08:05:25 -0800 (PST)
In-Reply-To: <AANLkTi=wSg+jNcV0QQs1_GJ1B3bEe7McLggO1bMshvpz@mail.gmail.com>
References: <AANLkTi=wSg+jNcV0QQs1_GJ1B3bEe7McLggO1bMshvpz@mail.gmail.com>
Date: Sun, 9 Jan 2011 10:05:25 -0600
Message-ID: <AANLkTimnJhTj+Vqqz0H1FdgLuMO6cd7svq=VBsit_YcR@mail.gmail.com>
From: Brandon Gooch <jamesbrandongooch@gmail.com>
To: Subbsd <subbsd@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Cc: freebsd-virtualization@freebsd.org
Subject: Re: way for determine VIMAGE feature
X-BeenThere: freebsd-virtualization@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Discussion of various virtualization techniques FreeBSD supports."
	<freebsd-virtualization.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization>,
	<mailto:freebsd-virtualization-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-virtualization>
List-Post: <mailto:freebsd-virtualization@freebsd.org>
List-Help: <mailto:freebsd-virtualization-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization>,
	<mailto:freebsd-virtualization-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 09 Jan 2011 17:08:03 -0000

On Sun, Jan 9, 2011 at 9:17 AM, Subbsd <subbsd@gmail.com> wrote:
> Hi
>
> is there any mechanism to find out from userland =A0is supports the
> current kernel VIMAGE or not? something like 'sysctl
> kern.features.vnet=3D1' ?
> Thanks

I've not been able to determine this either, but as it requires kernel
re-configuration, I usually just know. In my scripts, I make sure and
fail if the call to create a vnet jail fails:

sh -c 'TEST=3D$(sudo jail -c vnet name=3Dtest host.hostname=3Dtest path=3D/=
) ;
if [ $? =3D "1" ]; then echo "VIMAGE NOT AVAILABLE" ; exit 1 ; fi'

...or something like that.

There may be a better way, or perhaps there should be.

-Brandon