Re: [tycho-user] What are baseline repositories good for?

[Mickael Istria <mistria@xxxxxxxxxx>]

Hi all,
Hi Ed,

Tycho has everything in place to 1. Prevent production of new
artifacts when there is no payload change in the current module/bundle
source (saving QE effort and servers bandwidth on updates) and 2.
Guaranteeing versions evolve mostly forward compared to previous
release, forbidding the nasty qualifier only changes. Couple this with
automation of API Tools at build tile, then you get a build reliably
producing as few nnew artofacts as possible, reusing as much as
possible, preventing from bad version stagnation or regression and
enforcinfmg semantic versioning.

Many serious Eclipse.org projects (incl. Platform) do successfully use
those as qualitu gates.

Anything that's not successful for you here is either a configuration
issue on your end, or a bug in Tychi, which should at least be
reported.

Cheers

On 2/17/20, Ed Willink <ed@xxxxxxxxxxxxx> wrote:
> Hi
>
> On a good day, the reproducible qualifiers avoid you churning a new set
> of unchanged artefacts every build, thereby saving on distribution
> bandwidth.
>
> However that good day is totally depend on the fairies, since an unsound
> superficial view of GIT dependencies rather than a true
> has-it-changed-test is used.
>
> Do not use.
>
> Regards
>
> Ed Willink
>
> On 17/02/2020 19:21, Felix Dorner wrote:
>> Hi,
>>
>> on the wiki page:
>> https://wiki.eclipse.org/Tycho/Reproducible_Version_Qualifiers#What_does_this_actually_do.3F
>>
>>
>>
>> I follow along with the jgit based timestamps, but I dont understand
>> what the baseline repository configuration does. The wiki page sais:
>>
>> The end result is that build output contains new versions of the
>> artifacts that did change and baseline version of the artifacts that
>> did not.
>>
>> And "change" meaning version, id and "content". How is "content"
>> defined here?
>>
>> I will have follow up questions :)
>> Thanks,
>> Felix
>>
>>
>> --
>> Linux. The choice of a GNU generation.
>>
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-- 
Mickael Istria
Eclipse IDE <https://www.eclipse.org/downloads/eclipse-packages/>
developer, for Red Hat Developers <https://developers.redhat.com/>