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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Tue, 5 May 2009 18:26:09 +0200
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Cc: Martin Turgeon <freebsd@optiksecurite.com>
Subject: Re: Upgrading jails to 7.2-RELEASE with freebsd-update
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On Tuesday 05 May 2009 17:37:42 Martin Turgeon wrote:
> Hi everyone,
>
> It's the first time I'm using freebsd-update to upgrade my system to a
> new release. I just upgraded the base system from 7.1-RELEASE to
> 7.2-RELEASE and everything went fine. I now wanted to upgrade my jails
> to the new release but freebsd-update is telling me that's already
> updated...
>
> freebsd-update -b /usr/jail/mysql/ upgrade -r 7.2-RELEASE
> freebsd-update: Cannot upgrade from 7.2-RELEASE to itself

Should be able to trick it using:
env UNAME_r=7.1-RELEASE-p5 freebsd-update -b /path/to/jail

(based on a quick source scan, untested).
-- 
Mel