Bug#868276: apt_preferences(5): explain how one would combine e.g. origin, version and release Pins

[Christoph Anton Mitterer <calestyo@scientia.net>]

Package: apt
Version: 1.5~beta1
Severity: wishlist


Hi.

Looking at apt_preferences(5), it does, AFAICS, not explain the following:

a) What happen if multiple e.g. Pin: directives are found? It seems only
   the last one is taken and the former ones ignored (per block).
   btw: Perhaps it would be even good, if apt gives warnings in such cases.


b) How can one combine origin, version and release Pins?
   e.g. for a package named foo, when it's from Origin ACME, the version 10 shall get Priority 600:
Is this:
Package: foo
Pin: version 10 release o=ACME
Pin-Priority: 600

or would it be
Pin: version 10, release o=ACME

or would swapping work?
Pin: release o=ACME version 10
What if my Origin contains spaces?


Cheers,
Chris.