Re: [PATCH setup 00/14] Use libsolv, solve all our problems... (WIP)

[Jon Turney <jon dot turney at dronecode dot org dot uk>]

On 09/01/2018 15:49, Ken Brown wrote:
> On 1/9/2018 10:37 AM, Ken Brown wrote:
> > I just did a quick test, trying to uninstall B in the situation above,
> > and it didn't work as expected.  Even though "Uninstall A" was the first
> > solution, A didn't get uninstalled.
>
> In case you want to replicate this, what I actually tried was 
> uninstalling ImageMagick, which is required, directly or indirectly, by 
> asymptote, dblatex, and xmlto.  Solution 1 was to uninstall these three 
> but it didn't happen.

Doh.

solver_take_solution() modifies the task list (and I went to the trouble 
of refactoring things to make it available to it), but I didn't then 
re-solve with the modified task list.

Also, looking at this again, it looks like the solver places solutions 
which remove a task at the end of of the solution list, so this should 
be the default

(This matches the previous behaviour, where the default is to accept 
dependencies i.e. if you try to remove a package required by other 
packages, the default solution should be to cancel the removal)

Maybe we need more complex criteria to identify the default, but this 
seems to work in my limited testing.

I've rebased and updated the topic/libsolv branch.