commit ae2d51ba77db4a4855912d9c33565ef2f4203803
Author: Michal Domonkos <mdomonko@redhat.com>
Date:   Wed Jun 20 17:43:44 2018 +0200

    depsolve: filter out conflicting provider. BZ 1480065
    
    When there are multiple providers available for a requirement, yum would
    happily pick the one that the requiring package also has a "Conflicts:"
    on (via another virtual provide), failing to resolve the transaction.
    
    Example:
    - foo requires bar and conflicts my-bar
    - bax provides bar
    - bay provides bar, my-bar
    
    Yum might decide to pick bay, only to fail due to the conflict with foo
    later in the process.
    
    This commit fixes that by dropping such a provider from the candidate
    list when depsolving.

diff --git a/yum/depsolve.py b/yum/depsolve.py
index 3453456c..26369b7b 100644
--- a/yum/depsolve.py
+++ b/yum/depsolve.py
@@ -1556,6 +1556,13 @@ class Depsolve(object):
                 continue
             unique_nevra_pkgs[pkg.pkgtup] = pkg
         pkgs = unique_nevra_pkgs.values()
+
+        # Do a conflict filtering; get rid of those pkgs that reqpo conflicts
+        # with
+        if reqpo is not None:
+            pkgs = [pkg for pkg in pkgs
+                        if not any(pkg.checkPrco('provides', conflict)
+                                   for conflict in reqpo.conflicts)]
             
         pkgresults = {}