Bug 998707

Description of problem:
When installing a package with a Requires: on a virtual provides, the version provided by the virtual provides: has no impact on the resolution and the depsolver ends up falling back on further techniques (such as fewest additional dependencies or shortest package name) to select the package to resolve.

Version-Release number of selected component (if applicable):
yum-3.4.3-101.el7

How reproducible:
Every time

Steps to Reproduce:
I discovered this today while debugging an issue with OpenLMI.

We added a virtual "Provides: cim-server" to the packages sblim-sfcb (giving cim-server a version of 0) and tog-pegasus (giving cim-server a version of 1).

The expectation is that installing "openlmi-providers" which "Requires: cim-server" would automatically select tog-pegasus, since it provided the highest version of cim-server (unless sblim-sfcb was also manually provided on the yum command-line).

Actual results:
The yum resolver skipped this version comparison and fell back on using the number of additional dependent packages (1 for Pegasus vs. 0 for SFCB) and selected SFCB instead.

Expected results:
When only "Requires: cim-server" is provided, we would expect it to select the higher version unless sblim-sfcb was already installed or provided on the command-line.

Additional info:
We want to encourage the use of Pegasus for OpenLMI over SFCB as it is more fully-featured. To this end, we have manually added versioning to the 'cim-server' virtual Provides:

I debugged this with James Antill today on IRC and he discovered the source of this bug and has provided a one-liner patch here: http://yum.baseurl.org/gitweb?p=yum.git;a=commitdiff;h=3eaca8456a9b8c4321a2d3facf6e1084853ef492

Please pull this patch into yum in RHEL 7.0