When selecting packages to determine which choices have upgrades
or downgrades relative to other choices, make the package selections
internally consistent by choosing a package that satisfies all atoms
in the choice which match a package in the same slot.

Also, fix the Atom.match() method to handle _pkg_str instances,
since dep_zapdeps can pass in _pkg_str instances instead of Package
instances.

X-Gentoo-Bug: 600346
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=600346
---
[PATCH v2] fixes incorrect logic in dep_zapdeps

 pym/portage/dep/__init__.py  | 16 ++++++++++++----
 pym/portage/dep/dep_check.py | 28 ++++++++++++++++++++++++++--
 2 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/pym/portage/dep/__init__.py b/pym/portage/dep/__init__.py
index 5dd1638..968ff5b 100644
--- a/pym/portage/dep/__init__.py
+++ b/pym/portage/dep/__init__.py
@@ -1603,10 +1603,18 @@ class Atom(_unicode):
                if pkg.cp == self.cp:
                        return bool(match_from_list(self, [pkg]))
                else:
-                       for provided_cp in pkg.provided_cps:
-                               if provided_cp == self.cp:
-                                       return bool(match_from_list(
-                                               self.replace(self.cp, 
provided_cp, 1), [pkg]))
+                       try:
+                               provided_cps = pkg.provided_cps
+                       except AttributeError:
+                               # Since _pkg_str instances lack PROVIDE 
metadata,
+                               # just ignore this case (PROVIDE has been 
deprecated
+                               # for years).
+                               pass
+                       else:
+                               for provided_cp in provided_cps:
+                                       if provided_cp == self.cp:
+                                               return bool(match_from_list(
+                                                       self.replace(self.cp, 
provided_cp, 1), [pkg]))
                return False
 
 _extended_cp_re_cache = {}
diff --git a/pym/portage/dep/dep_check.py b/pym/portage/dep/dep_check.py
index 9d2ca4b..737d2b1 100644
--- a/pym/portage/dep/dep_check.py
+++ b/pym/portage/dep/dep_check.py
@@ -5,6 +5,7 @@ from __future__ import unicode_literals
 
 __all__ = ['dep_check', 'dep_eval', 'dep_wordreduce', 'dep_zapdeps']
 
+import collections
 import logging
 import operator
 
@@ -354,6 +355,7 @@ def dep_zapdeps(unreduced, reduced, myroot, use_binaries=0, 
trees=None):
                all_use_satisfied = True
                all_use_unmasked = True
                conflict_downgrade = False
+               slot_atoms = collections.defaultdict(list)
                slot_map = {}
                cp_map = {}
                for atom in atoms:
@@ -418,9 +420,31 @@ def dep_zapdeps(unreduced, reduced, myroot, 
use_binaries=0, trees=None):
                                        avail_slot = Atom("%s:%s" % (atom.cp, 
avail_pkg.slot))
 
                        slot_map[avail_slot] = avail_pkg
+                       slot_atoms[avail_slot].append(atom)
                        highest_cpv = cp_map.get(avail_pkg.cp)
-                       if highest_cpv is None or \
-                               vercmp(avail_pkg.version, highest_cpv.version) 
> 0:
+                       all_match_current = None
+                       all_match_previous = None
+                       if (highest_cpv is not None and
+                               highest_cpv.slot == avail_pkg.slot):
+                               # If possible, make the package selection 
internally
+                               # consistent by choosing a package that 
satisfies all
+                               # atoms which match a package in the same slot. 
Later on,
+                               # the package version chosen here is used in the
+                               # has_upgrade/has_downgrade logic to prefer 
choices with
+                               # upgrades, and a package choice that is not 
internally
+                               # consistent will lead the 
has_upgrade/has_downgrade logic
+                               # to produce invalid results (see bug 600346).
+                               all_match_current = all(a.match(avail_pkg)
+                                       for a in slot_atoms[avail_slot])
+                               all_match_previous = all(a.match(highest_cpv)
+                                       for a in slot_atoms[avail_slot])
+                               if all_match_previous and not all_match_current:
+                                       continue
+
+                       current_higher = (highest_cpv is None or
+                               vercmp(avail_pkg.version, highest_cpv.version) 
> 0)
+
+                       if current_higher or (all_match_current and not 
all_match_previous):
                                cp_map[avail_pkg.cp] = avail_pkg
 
                this_choice = _dep_choice(atoms=atoms, slot_map=slot_map,
-- 
2.7.4


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