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-rw-r--r--pym/_emerge/depgraph.py23
1 files changed, 21 insertions, 2 deletions
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index 5380de15b..7b74a265e 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -3408,8 +3408,27 @@ class depgraph(object):
return 1
if "complete" not in self._dynamic_config.myparams:
- # Skip this to avoid consuming enough time to disturb users.
- return 1
+ # Automatically enable complete mode if there are any
+ # downgrades, since they often break dependencies
+ # (like in bug #353613).
+ have_downgrade = False
+ for node in self._dynamic_config.digraph:
+ if not isinstance(node, Package) or \
+ node.operation != "merge":
+ continue
+ vardb = self._frozen_config.roots[
+ node.root].trees["vartree"].dbapi
+ inst_pkg = vardb.match_pkgs(node.slot_atom)
+ if inst_pkg and inst_pkg[0] > node:
+ have_downgrade = True
+ break
+
+ if have_downgrade:
+ self._dynamic_config.myparams["complete"] = True
+ else:
+ # Skip complete graph mode, in order to avoid consuming
+ # enough time to disturb users.
+ return 1
self._load_vdb()