Can't upgrade jails to 8.0 using freebsd-update

[Martin Turgeon]

Eirik Øverby a écrit :
>
> On 15. okt. 2009, at 19.44, Martin Turgeon wrote:
>
>> Eirik Øverby a écrit :
>>>
>>> On 8. okt. 2009, at 21.04, Martin Turgeon wrote:
>>>
>>>> Eirik Øverby a écrit :
>>>>> On 8. okt. 2009, at 19.58, Martin Turgeon wrote:
>>>>>
>>>>>> Hi everyone!
>>>>>>
>>>>>> I just upgraded a 7.2-REL to 8.0RC1 using freebsd-update. The 
>>>>>> upgrade
>>>>>> went fine on the base system following the procedure written in the
>>>>>> announcement email by Ken Smith. My problem is when I try to 
>>>>>> upgrade my
>>>>>> jails, I get this message:
>>>>>>
>>>>>> # freebsd-update -b /usr/jail/mysql/ fetch install
>>>>>> Looking up update.FreeBSD.org mirrors... 3 mirrors found.
>>>>>> Fetching metadata signature for 8.0-RC1 from 
>>>>>> update5.FreeBSD.org... done.
>>>>>> Fetching metadata index... done.
>>>>>> Inspecting system... done.
>>>>>> Preparing to download files... done.
>>>>>>
>>>>>> No updates needed to update system to 8.0-RC1-p0.
>>>>>> No updates are available to install.
>>>>>> Run '/usr/sbin/freebsd-update fetch' first.
>>>>>>
>>>>>> But, if I compare the dates of the files in the base system to 
>>>>>> the files
>>>>>> in the jails, it's obvious that the jails are not up to date.
>>>>>>
>>>>>> It seems like freebsd-update doesn't care about the basedir I 
>>>>>> specified.
>>>>>
>>>>> It does, but if you do a 'uname -a' - inside or outside the jail - 
>>>>> you'll see that it reports the OS revision of the host. So you 
>>>>> should have updated your jails first, then the host ...
>>>>>
>>>> Ok but if I update in the process of upgrading the first jail, the 
>>>> new kernel will be installed and asked to reboot. After that, I 
>>>> will have the same problem when upgrading the other jails and the 
>>>> base system, right? There must be something I don't  understand 
>>>> well. Thanks a lot for your answer.
>>>
>>> The kernel will be installed inside the jail, and the message about 
>>> rebooting can be safely ignored. Just run the install command once 
>>> more, and you're done and can move on to the next jail. :)
>>>
>>> /Eirik
>>>
>>>
>>>> Martin
>>>>> One way to get around it is to replace /usr/bin/uname with a shell 
>>>>> script, which calls the original uname (which you have renamed) 
>>>>> and pipes through something like sed to replace the revision with 
>>>>> what you used to have:
>>>>>
>>>>> #!/bin/sh
>>>>> /usr/bin/uname.org $* | sed s/"8.0-RC1-p0"/"7.2-RELEASE_p3"/g
>>>>>
>>>>> And this is a seriously butt ugly hack.
>>>>>
>>>>> /Eirik
>>>>>
>>>>>> Thanks a lot for your help,
>>>>>>
>>>>>> Martin
>>>>>>
>>>>>>
>> Thanks a lot! It worked great, but I'm still concerned by the fact 
>> that the world in the jails are from 8.0 while the kernel is still at 
>> 7.2 during the updates of the jails. In the normal update procedure, 
>> the kernel is upgraded first, rebooted and then the world is updated. 
>> It must have a good reason for this. Why can I jail be an exception 
>> to this rule?
>
> Because when you upgrade the host, the very binaries you are 
> installing are being installed by ... the binaries you are installing. 
> Which is why you'll want them to be reasonably in-sync with the kernel.
>
> When upgrading jails using freebsd-update, my understanding is that it 
> uses the host binaries to  push files to the target directory 
> (basedir). The risk of trouble is therefore very low (I've upgraded 
> dozens of jails from 7.x to 8.0-RC1 without any issues), though I can 
> probably imagine situations where this is not the case - i.e. if the 
> upgrade depends on functionality in an upgraded binary in order to be 
> able to complete the upgrade, however that sounds like a very unlikely 
> scenario to me. And *any* use of the basedir option to freebsd-update 
> would break in such a case.
>
> /Eirik
>
Sounds reasonable to me. Thanks for your quick reply.

Martin