refs: added constructor flag to allow refs to be instatiated from any path, including simple test

Author: Byron

git/refs/reference.py

@@ -20,15 +20,17 @@ class Reference(SymbolicReference, LazyMixin, Iterable):
 	_resolve_ref_on_create = True
 	_common_path_default = "refs"
 
-	def __init__(self, repo, path):
+	def __init__(self, repo, path, check_path = True):
 		"""Initialize this instance
 		:param repo: Our parent repository
 		
 		:param path:
 			Path relative to the .git/ directory pointing to the ref in question, i.e.
-			refs/heads/master"""
-		if not path.startswith(self._common_path_default+'/'):
-			raise ValueError("Cannot instantiate %r from path %s, maybe use %s.to_full_path(name) to safely generate a valid full path from a name" % ( self.__class__.__name__, path, type(self).__name__))
+			refs/heads/master
+		:param check_path: if False, you can provide any path. Otherwise the path must start with the 
+			default path prefix of this type."""
+		if check_path and not path.startswith(self._common_path_default+'/'):
+			raise ValueError("Cannot instantiate %r from path %s" % (self.__class__.__name__, path))
 		super(Reference, self).__init__(repo, path)
 
 

git/test/refs/test_refs.py

@@ -29,6 +29,11 @@ def test_from_path(self):
 				assert isinstance(instance, ref_type)
 			# END for each name 
 		# END for each type
+		
+		# invalid path
+		self.failUnlessRaises(ValueError, TagReference, self.rorepo, "refs/invalid/tag")
+		# works without path check
+		TagReference(self.rorepo, "refs/invalid/tag", check_path=False)
 
 	def test_tag_base(self):
 		tag_object_refs = list()