egencache: fix cmp_func for python3

1 files changed, 8 insertions, 0 deletions

diff --git a/bin/egencache b/bin/egencache
index e5685c4dc..5307cd5a2 100755
--- 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():