Updating python-debian support for build profiles

[Stuart Prescott]

Hi!

I've been contemplating deb822's support for build profiles some more and in 
particular looked the recent changes to the build profiles / build restrictions 
specification. The attached patches are my current thinking on the matter.

The main changes are:

* there now can be multiple sets of < … > restrictions specified for each 
package

* as a result, we need to return a list of restrictions not a single 
restriction

* I propose flattening the representation of each restriction from (enabled, 
(namespace, label)) to (enabled, namespace, label)

* Following John's suggestion, I'm looking to use namedtuples to provide 
backwards compatibility for the architecture restrictions while also providing 
a nicer syntax for accessors to both arch and build restrictions objects.


As you will see in the patches, that means that 

      "texlive <!profile.cross>"   

becomes

                    [[(false, 'profile', 'cross')]]

and

    'debhelper (>> 5.0.0)  <!profile.stage1> <!profile.cross !profile.stage2>'

becomes

	[
                        [(False, 'profile', 'stage1')],
                        [(False, 'profile', 'stage2'),
                         (False, 'profile', 'cross')]
	]

The innermost tuple is also accessible as a namedtuple (enabled, namespace, 
label).

Comments and suggestions welcome!

cheers
Stuart

-- 
Stuart Prescott    http://www.nanonanonano.net/   stuart at nanonanonano.net
Debian Developer   http://www.debian.org/         stuart at debian.org
GPG fingerprint    90E2 D2C1 AD14 6A1B 7EBB 891D BBC1 7EBB 1396 F2F7
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