If deepcopy() raises a TypeError for a lazy item that has been added via a

call to LazyItemsDict.addLazySingleton(), automatically evaluate the
the singleton and instead call deepcopy() on the result.

svn path=/main/trunk/; revision=12704

1 files changed, 15 insertions, 3 deletions

diff --git a/pym/portage/util.py b/pym/portage/util.py
index 2cb14b34d..92f658c58 100644
--- a/pym/portage/util.py
+++ b/pym/portage/util.py
@@ -1139,6 +1139,10 @@ class LazyItemsDict(dict):
 
 		If deepcopy() needs to work, this problem can be avoided by
 		implementing lazy items with normal (non-bound) functions.
+
+		If deepcopy() raises a TypeError for a lazy item that has been added
+		via a call to addLazySingleton(), the singleton will be automatically
+		evaluated and deepcopy() will instead be called on the result.
 		"""
 		if memo is None:
 			memo = {}
@@ -1148,9 +1152,17 @@ class LazyItemsDict(dict):
 		for k in self:
 			k_copy = deepcopy(k, memo)
 			if k in self.lazy_items:
-				dict.__setitem__(result, k_copy, None)
-				result.lazy_items[k_copy] = \
-					deepcopy(self.lazy_items[k], memo)
+				lazy_item = self.lazy_items[k]
+				try:
+					result.lazy_items[k_copy] = deepcopy(lazy_item, memo)
+				except TypeError:
+					# If deepcopy fails for a lazy singleton, try to
+					# evaluate the singleton and deepcopy the result.
+					if not isinstance(lazy_item[0], self._SingletonWrapper):
+						raise
+					dict.__setitem__(result, k_copy, deepcopy(self[k], memo))
+				else:
+					dict.__setitem__(result, k_copy, None)
 			else:
 				dict.__setitem__(result, k_copy, deepcopy(self[k], memo))
 		return result