From owner-soc-status@FreeBSD.ORG Tue Jun 15 14:07:25 2010 Return-Path: Delivered-To: soc-status@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 13E0F106566C for ; Tue, 15 Jun 2010 14:07:25 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id D7F918FC1E for ; Tue, 15 Jun 2010 14:07:24 +0000 (UTC) Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net [66.111.2.69]) by cyrus.watson.org (Postfix) with ESMTPSA id 897FB46C05; Tue, 15 Jun 2010 10:07:24 -0400 (EDT) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id 2D4D18A050; Tue, 15 Jun 2010 10:07:23 -0400 (EDT) From: John Baldwin To: Alexander Leidinger Date: Tue, 15 Jun 2010 09:58:29 -0400 User-Agent: KMail/1.12.1 (FreeBSD/7.3-CBSD-20100217; KDE/4.3.1; amd64; ; ) References: <20100614151113.17a1c368@kibab.com> <201006141636.02843.jhb@freebsd.org> <20100615092452.82902tdo05uyg5mo@webmail.leidinger.net> In-Reply-To: <20100615092452.82902tdo05uyg5mo@webmail.leidinger.net> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201006150958.29782.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (bigwig.baldwin.cx); Tue, 15 Jun 2010 10:07:23 -0400 (EDT) X-Virus-Scanned: clamav-milter 0.95.1 at bigwig.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.5 required=4.2 tests=AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on bigwig.baldwin.cx Cc: Ilya Bakulin , soc-status@freebsd.org Subject: Re: [Status update] sysctlreg project X-BeenThere: soc-status@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Summer of Code Status Reports and Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Jun 2010 14:07:25 -0000 On Tuesday 15 June 2010 3:24:52 am Alexander Leidinger wrote: > Quoting John Baldwin (from Mon, 14 Jun 2010 16:36:02 -0400): > > > Hmmm, is this spoofing a desired feature? If so, perhaps it should > > be done in > > userland via environment options that affect the feature_present(3) API in > > libc? (In that case you would write a little feature_present(1) util that > > uses the userland API and use this instead of direct sysctls in ports, etc.) > > Kris listed spoofing (no mention if only "spoof-off" or also > "spoof-on", but for "spoof-on" when the feature is not present in the > kernel we can only come up with scenarios where it will hurt) as > desired for the ports collection. > > Regarding an userland utility: > 1) To be able to spoof-off a feature in a jail (from the host, not > inside the jail) without the possibility that the jail-root is able to > turn it on again, a feature_present(1)+env will not help much, you > need to do this in the kernel. > 2) With 1) in mind, why another tool for the ports to query the > status, sysctl is enough. If you wish to do 1) though it seems wrong to have to have the same spoof settings for the entire host. It would seem that you would want to have different feature sets in different jails. So far the env approach has been good enough for spoofing uname data for ports builds. I see no reason why it shouldn't be equally functional for feature test overrides for ports builds. -- John Baldwin