setup and 'provides:'
Mon Oct 8 18:07:00 GMT 2018
On 10/7/2018 6:02 PM, Ken Brown wrote:
> I've been experimenting with setup's support for the 'provides:' tag, and it's
> not behaving the way I expect [*]. I'm not sure if something in setup's
> interface with libsolv needs to be tweaked or if I'm just misunderstanding how
> this should work. Here's what I tried:
> I created a test repo with packages A, B, and C. I made A require foo (not a
> package), and I made B and C provide foo. The attached script does all this
> [**]. I then ran setup and selected A for installation.
> The result was that libsolv simply chose B for installation, and setup showed
> this in the "Confirm" dialog. What I expected was that libsolv would report a
> problem ("A requires foo but no selected or installed packages provide it"),
> with two possible solutions ("Install B or C"). Is that expectation unreasonable?
> I plan to look into the libsolv sources to see if I can fix this, but I'm hoping
> that someone already knows the answer.
It turns out that this question has been asked before:
AFAICT, libsolv will by default pick the alphabetically first package
when there are several equally good candidates to meet the requirements.
According to the second link I cited, "libsolv offers methods to query
for the encountered ambiguities after the solving, so that the user can
be presented with a list of choices and then select different packages."
I may look into this further, but I'm beginning to wonder if it's worth
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