ZYPP: Changes regarding project Lotus and the introduction of PTFs

Hi.

(Available since libzypp-17.27.0)

The introduction of PTFs brings a few changes which may affect the YAST package
selector:

A while ago we introduced retracted patches/packages. In some respects PTFs and
retracted packages behave similar: Independently of their version they will
never be considered as a candidate by the resolver unless one explicitly
selects them. This is why we sort retracted packages always to the end of the
list of available version of a package (in zypp:ui:Selectable).

And we will now do the same with PTFs.


While it's disfavored to select and install retracted packages, selecting a PTF,
and deselecting it once the official patches contain the fix, will be common.
Nevertheless they are no candidate in the 'normal' package selection, but must
be selected explicitely.

Due to this we introduced the term of 'blacklisted' packages.

Blacklisted = Retracted || Ptf


Blacklisted packages are those which are sorted to the end of the lists and are
otherwise ignored by the resolver. You need to explicitly select them if you
want them.

According to the already available isRetracted() methods in sat::Solvable,
PoolItem, ResObjects and hasRetracted(), hasRetractedInstalled() methods in
ui::Selectable, we now introduced isBlacklisted(), hasBlacklisted(),
hasBlacklistedInstalled() methods which cover any type of blacklisted items.
And of course the corresponding *Ptf() methods, so you can tell why some item
is blacklisted.

--

cu,
Michael Andres

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