Not checking 'AND Dependencies' for virtual packages (Provides)

[Camicri Systems]

Discovered when finding dependencies of 'python-qt4'

In the package python-qt4, there is one dependency which is a virtual package (Not existing and provided by another package)
- sip-api-8.1

Package sip-api-8.1 is provided by python-sip package, which is existing in the available packages.

However, Cube didn't include python-sip to the list of packages to be downloaded. While in a normal 'apt-get install python-qt4', the package python-sip is included.

Checking the code, this is not a problem if the package sip-api-8.1 is an 'OR Dependency'. In 'OR Dependency', if a package is not existing in the available packages, it will check for packages that provides sip-api-8.1.

In 'AND Dependency', there is no checking for packages that provides sip-api-8.1, thus, failing to find the package python-sip.

[Camicri Systems (camicrisystems)]

Fixed Committed

We have added Provides checking in the 'AND Dependency' also

See Revision 115
http://bazaar.launchpad.net/~camicrisystems/cube-server/trunk/revision/115