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Date: Wed, 07 Jan 2015 11:17:32 -0800
From: Darren Pilgrim <list_freebsd@bluerosetech.com>
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To: =?UTF-8?B?RGFnLUVybGluZyBTbcO4cmdyYXY=?= <des@des.no>, 
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Subject: Re: FreeBSD Security Advisory FreeBSD-SA-14:31.ntp
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On 1/7/2015 10:50 AM, Dag-Erling Smørgrav wrote:
> Leif Pedersen <bilbo@hobbiton.org> writes:
>> It seems like -b doesn't work for upgrades though,
>
> Yes, it does.
>
>>      # env UNAME_r=10.1-RELEASE freebsd-update -b /j/test upgrade
>>      freebsd-update: Release target must be specified via -r option.
>
> This doesn't work because you didn't specify the target.
>
>>      # freebsd-update -b /j/test -r 10.1 upgrade
>>      freebsd-update: Cannot upgrade from 10.1-RELEASE to itself
>
> This doesn't work because you didn't specify the correct starting point.
> You have to set UNAME_r to what the jail is currently running.

Is that to say

`env UNAME_r=A.B-RELEASE freebsd-update -b /jail/path -r C.D-RELEASE 
upgrade`

is the correct command?