Bug#841667: libconfig-model-dpkg-perl: Dependency calculation gets confused by various versions in a suite

[Dominique Dumont]

On Friday, 21 October 2016 23:03:48 CEST you wrote:
> Looks like it gets and uses the first or second hit which is 5.22.2-5
> for an old source package still lingering around.

Good catch. I've also been puzzled sometimes by cme results but I've never 
found the origin of the issue.

> Maybe get_available_version() or cache_info_from_madison() / or
> extract_madison_info() could look at binary packages for the current arch
> instead of the source version,

Well, versioned dependencies are most often specified without taking arch into 
account, so looking at the available version for current arch will be more complicated.

> or for binary instead of source?

I like that better. It certainly is enough to get perl version in unstable.

On the other hand, what should be done with a case like:

$ wget -q -O - 'https://api.ftp-master.debian.org/madison?package=libuv1&b=deb'
libuv1     | 1.9.0-1~bpo8+1 | jessie-backports | amd64, arm64, armel, armhf, i386, mips, mipsel, powerpc, ppc64el, s390x
libuv1     | 1.9.0-1        | unstable         | hurd-i386
libuv1     | 1.9.1-1        | testing          | amd64, arm64, armel, armhf, i386, mips, mips64el, mipsel, powerpc, ppc64el, s390x
libuv1     | 1.9.1-3        | buildd-unstable  | amd64, arm64, armel, armhf, i386, kfreebsd-amd64, kfreebsd-i386, mips, mips64el, mipsel, powerpc, ppc64el, s390x
libuv1     | 1.9.1-3        | unstable         | amd64, arm64, armel, armhf, i386, kfreebsd-amd64, kfreebsd-i386, mips, mips64el, mipsel, powerpc, ppc64el, s390x

Which version should be considered as the unstable one ? Could we have a similar problem when trying to cleanup
old versions (the one older than old-stable) ?

A way around that is to consider amd64 as the "reference" arch to get package version. This would
simplify the problem and be correct most of the time.

Thoughts ?

> Maybe something like this is enough (untested!):

That's a good start. Thanks for the patch

All the best
-- 
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