Bug#905747: lintian: Better checking of DEP-5 copyright Files field

[Niels Thykier <niels@thykier.net>]

Package: lintian
Version: 2.5.94
Severity: minor

I saw the following in a d/copyright today and expected lintian to
give some form of warning:

"""
Files:     *
           debian/patches/*
Copyright: [...]
License:   License1

Files:     debian/*
Copyright: [...]
License:   License2
"""

There are two distrinct issues here:

 1) The debian/patches/* entry in the first paragraph is completely
    overwritten by the debian/*.  There is no warning about this
    even though it is a mistake (redundant at best; most likely
    an incorrect license is recorded for the overshadowed entry).


 2) Having "*" together with anything else is redundant at best and
    almost certainly a mistake.


In the concrete case, what the person wanted was:

"""
Files:     *
           debian/patches/*
Copyright: [...]
License:   License1

Files:     debian/*
Copyright: [...]
License:   License2

Files:     debian/patches/*
Copyright: [...]
License:   License1
"""

I.e. debian/* is under License2 except for debian/patches which has
the same license as all of upstreams code.

Thanks,
~Niels