aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorZac Medico <zmedico@gentoo.org>2020-09-19 14:32:41 -0700
committerZac Medico <zmedico@gentoo.org>2020-09-20 15:27:32 -0700
commitf64310749f176f8921b72ce282b4294efe81c3f0 (patch)
tree3c205d6167c1e04e54568bc06a7f6696225f7027 /lib/_emerge/depgraph.py
parentAdd mercurial sync support (diff)
downloadportage-f64310749f176f8921b72ce282b4294efe81c3f0.tar.gz
portage-f64310749f176f8921b72ce282b4294efe81c3f0.tar.bz2
portage-f64310749f176f8921b72ce282b4294efe81c3f0.zip
_slot_confict_backtrack: minimize conflict atoms (bug 743631)
Prefer choices that minimize conflict atoms, so that choices which satisfy all parents are preferred. This reduces the minimum necessary backtrack tries from 21 to 7 for the unit test related to bug 743115. Bug: https://bugs.gentoo.org/743115 Bug: https://bugs.gentoo.org/743631 Signed-off-by: Zac Medico <zmedico@gentoo.org>
Diffstat (limited to 'lib/_emerge/depgraph.py')
-rw-r--r--lib/_emerge/depgraph.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/_emerge/depgraph.py b/lib/_emerge/depgraph.py
index 3f864aefc..7281d8692 100644
--- a/lib/_emerge/depgraph.py
+++ b/lib/_emerge/depgraph.py
@@ -1797,6 +1797,12 @@ class depgraph:
if parent_atom not in parent_atoms)
backtrack_data.append((to_be_masked, conflict_atoms))
+ # Prefer choices that minimize conflict atoms. This is intended
+ # to take precedence over the earlier package version sort. The
+ # package version sort is still needed or else choices for the
+ # testOverlapSlotConflict method of VirtualMinimizeChildrenTestCase
+ # become non-deterministic.
+ backtrack_data.sort(key=lambda item: len(item[1]))
to_be_masked = backtrack_data[-1][0]
self._dynamic_config._backtrack_infos.setdefault(