[PATCH setup 0/2] Detect filename collisions between packages

[Jon Turney]

On 24/04/2023 19:16, Achim Gratz via Cygwin-apps wrote:
> Corinna Vinschen via Cygwin-apps writes:
>> Calm could create a database containing all the files from the tar
>> archives it uploads, and compare that against the newly uploaded files
>> on the fly.
> 
> That already exists as the basis for package grep, albeit in the form of
> a buiinch of text files.
> 
> […]
>> There's probably another problem in terms of different file lists in
>> different package versions, though...
> 
> That is probably not too onerous to check for, but files moving from one
> package to another is a different story.

This is certainly doable.

(There's a few more wrinkles, as calm doesn't presently concern itself 
with trying to work out what the solver would install if you asked to 
install "everything", considering 'obsoletes:', and maybe even explicit 
'conflicts:' markers in hints, etc.)

I think this functionality needs to exist in setup as well, though, as 
calm can't possibly have knowledge of packages you might be installing 
from 3rd party overlay package repositories.