Bug#822833: Detect Recommends to non-free

[Jakub Wilk <jwilk@debian.org>]

Hi Mathieu!

* Mathieu Malaterre <malat@debian.org>, 2016-04-28, 08:37:
> It would be super nice if lintian could somehow detect 'Recommends' 
> pointing outside main:
>
> Policy 2.2.1 states:
>
> > In addition, the packages in main
> >
> > must not require or recommend a package outside of main for 
> > compilation or execution (thus, the package must not declare a 
> > "Pre-Depends", "Depends", "Recommends", "Build-Depends", or 
> > "Build-Depends-Indep" relationship on a non-main package),
>
> This was detected by a human:
>
> https://bugs.debian.org/820190

Lintian doesn't do any cross-package checks (with the exception of 
packages built from the same sources). We have debcheck for archive-wide 
dependency checks:

https://qa.debian.org/debcheck.php?dist=sid&list=withinmain&arch=ANY

(Sadly, debcheck UI leaves much to be desired, and it looks 
unmaintained. :-\)

That said, there are currently only ~760 non-main packages, and the list 
probably don't change much over time, so maybe we could just save the 
list into a static data file.

--
Jakub Wilk