[lttng-dev] latest version of LTTng UST on Ubuntu 12.04

[McDermott, Andrew]

Stéphane Graber <stgraber at ubuntu.com> writes:

> Hi,
>
> Sorry, I've been terribly busy lately.
>
> Ubuntu has a pretty strict policy of only accepting bugfixes in the
> -updates pocket post-release.
>
> For LTTng, the 2.0.x series is supposed to be feature stable so should
> in theory be fine to push to the -updates pocket. However for that to
> happen, someone needs to grab all the lttng releases from 2.0.1 and
> check and justify every changelog entry.
>
> My plan was to spend some time doing that once babeltrace 1.0 is
> released which I now see actually happened recently.
>
> We also need to keep in mind that we can't push something to 12.04
> that's more recent than what we have in 12.10 as we need to keep a
> working upgrade path between 12.04 and 12.10.
>
> So looking at the latest releases, I think we'd want:
>  - lttng-tools - 2.0.4
>  - lttng-modules - 2.0.5
>  - lttng-ust - 2.0.5
>  - liburcu - 0.7.5
>  - babeltrace - 1.0.0
>
> That'd mean the following stable release updates for Ubuntu 12.10:
>  - lttng-tools 2.0.3 => 2.0.4
>  - lttng-modules 2.0.4 => 2.0.5
>  - ust 2.0.4 => 2.0.5 (the package changed name between 12.04 and 12.10)
>  - liburcu 0.7.3 => 0.7.5
>  - babeltrace 1.0.0~rc4 => 1.0.0
>
> And then the following stable release updates for Ubuntu 12.04 LTS:
>  - lttng-tools 2.0.1 => 2.0.4
>  - lttng-modules 2.0.2 => 2.0.5
>  - lttng-ust 2.0.2 => 2.0.5
>  - liburcu 0.6.7 => 0.7.5
>  - babeltrace 1.0.0~rc1 => 1.0.0
>
> As everyone of those would be a version change, they'd all need to come
> along with a detailed test plan on all 5 supported architectures (amd64,
> i386, powerpc, armel, armhf) detailing how upstart (lttng) is ensuring
> that no regression has happened.
> The libraries will also need to be ABI compatible as rebuilding all
> reverse-dependencies isn't an option post-release.
>
> I'd expect that work, assuming lttng upstream's current test plans are
> accepted by the Ubuntu Technical Board to be of sufficient quality to
> guarantee a regression-free update, to take a good dozen of hours to
> prepare followed by reactive work for the month following to get those
> into the updates pocket.
>
> I don't think I'll realistically have the time to do that work anytime
> soon as lttng isn't a package officially supported by Canonical and so
> doesn't fall in my day job activities.
>
> An alternative would be to get lttng into the backports pocket of Ubuntu
> 12.04, the process for that is quite a bit easier as it doesn't required
> Technical Board approval or the strict testing process but will be less
> visible to the users as they'll have to explicitly pull it from the
> backports pocket (by using apt-get install lttng-tools=2.0.4 for example).
>
> Hope this clarifies the current situation a little.

It certainly does.  Many thanks for the detailed reply.  I think for now
I will build from source - and pretty much those versions you have
already highlighted.

>
> On 11/19/2012 10:17 AM, Mathieu Desnoyers wrote:
>> Let's ask Stéphane Graber, our Ubuntu packager.
>> 
>> Thanks,
>> 
>> Mathieu
>> 
>> * McDermott, Andrew (Andrew.McDermott at windriver.com) wrote:
>>>
>>> How often are the LTTng UST packages for Ubuntu updated?
>>>
>>> Having done a fresh install I see the version reported as:
>>>
>>>   $ lttng version
>>>   lttng version 2.0.1 - Annedd'ale
>>>
>>> but looking at the git repo I see there is v2.0.4 tag.  Are these
>>> updates only available if built from source?  In general I was trying to
>>> avoid the daily development versions from:
>>>
>>>   https://launchpad.net/~lttng/+archive/daily.
>>>
>>> -- 
>>> andy