Comment # 7 on bug 1155624 from Jonathan Kang

(In reply to Dominique Leuenberger from comment #6)
> (In reply to Jonathan Kang from comment #5)
> > The closest we can achieve now is:
> > 
> > # a is installed in the system, while b and c is not.
> > $ pkcon install a b c
> > Resolving bla bla
> > The following packages have to be installed:
> >  b    description of package b
> >  c    description of package c
> > Proceed with changes? [N/y] y
> > Installing bla bla
> > Finished
> > Fatal error: a is already installed.
> 
> It shouldn't be a 'Fatal error' (it's rather an information) - and pkcon
> should not exit with error code - the rest is acceptable

This is as close as we can get with how PK works now. PK doesn't have a
mechanism
to allow backend pass a summary.
Let's just ignore those already installed packages and proceed installing
others
atm.