egencache: fix cmp_func for python3

diff --git a/bin/egencache b/bin/egencache
index e5685c4dc88dcdc4a0251c8f20183cc22f2d59ac..5307cd5a202d5156feff7959bfd823dab27290e6 100755 (executable)
--- a/bin/egencache
+++ b/bin/egencache
@@ -455,6 +455,14 @@ class GenUseLocalDesc(object):
                # since we don't want any confusion given that we never
                # want to rely on the builtin cmp function.
                def cmp_func(a, b):
+                       if a is None or b is None:
+                               # None can't be compared with other types in python3.
+                               if a is None and b is None:
+                                       return 0
+                               elif a is None:
+                                       return -1
+                               else:
+                                       return 1
                        return (a > b) - (a < b)
 
                for cp in self._portdb.cp_all():