[Ubuntu] Stable update

[Randal Hale]

Bas - if we ever meet I owe you a beer or 10 for that explanation.

I will also be doing a lot of reading and figuring out how I can fit 
into this process.

On 04/29/2016 01:33 PM, Worth Lutz wrote:
> WOW! That is a very complete explanation!
>
> It explains why I'm seeing PostgreSql updates and not MapServer.
>
> I hope I'll be able to figure out how to help. It looks like I'll be 
> doing a lot of reading this weekend.
>
> Thanks,
> *Worth Lutz*
>
>
> On 4/29/2016 12:56 PM, Sebastiaan Couwenberg wrote:
>> On 04/29/2016 04:33 PM, Worth Lutz wrote:
>>> You mention dealing with the version in Ubuntu and the version in
>>> UbuntuGIS. This is always something I have not understood.
>>>
>>> I've never understood the policies of how the versions come downstream
>>> from Debian to Ubuntu. What updates get made by DebianGIS? Do these flow
>>> down to Ubuntu? Or are Debian and Ubuntu stuck at a certain revision and
>>> a ppa like UbuntuGIS is used to provide updated packages?
>> The Debian GIS team updates the packaging as soon as possible after a
>> new upstream release is made. These packages are uploaded to Debian
>> unstable most often, or to experimental in case of pre-releases or new
>> releases that break the ABI and need a transition. Packages migrate from
>> the Debian unstable repository to the testing repositories after 5 to 10
>> days if the version is not affected by a Release Critical bug. After
>> about two years of development the package versions in the testing
>> repository get frozen in preparation of the new stable release, the
>> remaining release critical bugs get fixed after which the release is
>> published (installer images generated, documentation updates, etc).
>> Package revisions in the stable release remain frozen as they were in
>> the testing suite in preparation of the release. Only security fixes and
>> other important bugfixes are made to the packages in stable, this rules
>> out upgrading to new upstream releases. Some exceptions exists like
>> postgresql, mysql whose release engineering matches the Debian QA
>> requirements.
>>
>> Ubuntu syncs new packages from Debian unstable as part of their
>> development cycle. For the unstable suite this is a mostly automatic
>> process. In preparation of a new release the development repository is
>> frozen and a similar process as for Debian releases follows. After
>> release only targeted fixes are included in packages.
>>
>> The general flow of a new upstream releases into Debian and Ubuntu
>> releases is as follows:
>>
>>   Upstream release
>>    ↳ Debian unstable → testing → stable
>>       ↳ Ubuntu development → release
>>
>> The Debian GIS team maintains source packages for most of the packages
>> that are used in the UbuntuGIS PPA. Generally the process to update a
>> package in the UbuntuGIS PPA is to checkout the latest revision from the
>> Debian GIS git repository and create a no-change rebuild for the Ubuntu
>> LTS release in question. This is not an automatic process, it requires
>> some one involved in the UbuntuGIS team to prepare the builds for
>> Ubuntu. Because updates to packages in the UbuntuGIS PPA are not
>> governed by the strict rules for Ubuntu releases newer upstream versions
>> can be provided, the popularity of the PPA proves the need for newer
>> versions of the GIS packages than included in the Ubuntu releases.
>>
>> Backports for the Debian stable releases provide in a similar need for
>> Debian stable users. Package revisions that have migrated to the testing
>> repository and meet other requirements are eligible for backporting. The
>> core libraries (gdal, geos, etc) are not good candidates for backports,
>> because all packages that depend on any of the libraries need to be
>> rebuilt for SONAME bumps and may need additional changes as well. Such
>> updates are included in UbuntuGIS increasing the burden for its
>> contributors because they need to manage those transitions themselves too.
>>
>> Kind Regards,
>>
>> Bas
>>
>
>
>
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-- 
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
twitter:rjhale     http://about.me/rjhale
http://www.northrivergeographic.com/introduction-to-quantum-gis
https://www.facebook.com/NRGSInc

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