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Date:      Sun, 31 Mar 2013 20:24:26 -0600
From:      Jamie Gritton <jamie@FreeBSD.org>
To:        Paul Schenkeveld <freebsd@psconsult.nl>
Cc:        freebsd-jail@FreeBSD.org
Subject:   Re: rc.d/jail and jail.conf
Message-ID:  <5158EFDA.7060406@FreeBSD.org>
In-Reply-To: <20130401020158.GA5500@psconsult.nl>
References:  <AA7CA531-5197-4BBC-B260-A3EC8B7A1024@inbox.im> <alpine.BSF.2.00.1303302157010.85469@erdgeist.org> <515847AF.8070808@FreeBSD.org> <5158526A.4020400@quip.cz> <51586419.5090207@FreeBSD.org> <51586DC8.7030500@quip.cz> <515880F3.1050300@FreeBSD.org> <5158874C.2060701@erdgeist.org> <515888BA.8060804@FreeBSD.org> <alpine.BSF.2.00.1303312112370.85469@erdgeist.org> <20130401020158.GA5500@psconsult.nl>

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On 03/31/13 20:01, Paul Schenkeveld wrote:
> On Sun, Mar 31, 2013 at 09:14:23PM +0200, Dirk Engling wrote:
>>
>> On Sun, 31 Mar 2013, Jamie Gritton wrote:
>>
>>> If you don't mind some slightly difficult error messages, you can always
>>> "disable" a jail with exec.prestart="false". jail(8) requires all
>>> commands to succeed, and in particular won't even create a jail when one
>>> of the prestart commands fails.
>>
>> This violates POLA, but failing with
>>
>> exec.prestart="echo skipping jail; exit 1"
>>
>> might work. Even though this is not a good marker from a scripting
>> perspective.
>
> Will this prevent all preparations from happening, i.e. will filesystems
> be mounted for jails disabled this way?

It will unroll anything that's been done, or at least try to. So
filesystems will be mounted, and then unmounted.

> Although this may work, I think that this looks dirty.  I'd really prefer
> a "disabled" or "noauto" keyword instead.

Oh it's definitely dirty - just something I threw out there as a hack.

- Jamie



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