fix issue of recurse_zones not being converted to bool properly

add bool_from_str util call
add test for bool_from_str
slight rework of min/max_count check

nova/api/openstack/create_instance_helper.py

@@ -119,14 +119,8 @@ class CreateInstanceHelper(object):
         # min_count and max_count are optional.  If they exist, they come
         # in as strings.  We want to default 'min_count' to 1, and default
         # 'max_count' to be 'min_count'.
-        if not min_count:
-            min_count = 1
-        else:
-            min_count = int(min_count)
-        if not max_count:
-            max_count = min_count
-        else:
-            max_count = int(max_count)
+        min_count = int(min_count) if min_count else 1
+        max_count = int(max_count) if max_count else min_count
         if min_count > max_count:
             min_count = max_count
 

nova/api/openstack/servers.py

@@ -80,8 +80,7 @@ class Controller(object):
         reservation_id = query_str.get('reservation_id')
         project_id = query_str.get('project_id')
         fixed_ip = query_str.get('fixed_ip')
-        recurse_zones = query_str.get('recurse_zones')
-        recurse_zones = recurse_zones and True or False
+        recurse_zones = utils.bool_from_str(query_str.get('recurse_zones'))
         instance_list = self.compute_api.get_all(
                 req.environ['nova.context'],
                 reservation_id=reservation_id,

nova/tests/test_utils.py

@@ -276,6 +276,19 @@ class GenericUtilsTestCase(test.TestCase):
         result = utils.parse_server_string('www.exa:mple.com:8443')
         self.assertEqual(('', ''), result)
 
+    def test_bool_from_str(self):
+        self.assertTrue(utils.bool_from_str('1'))
+        self.assertTrue(utils.bool_from_str('2'))
+        self.assertTrue(utils.bool_from_str('-1'))
+        self.assertTrue(utils.bool_from_str('true'))
+        self.assertTrue(utils.bool_from_str('True'))
+        self.assertTrue(utils.bool_from_str('tRuE'))
+        self.assertFalse(utils.bool_from_str('False'))
+        self.assertFalse(utils.bool_from_str('false'))
+        self.assertFalse(utils.bool_from_str('0'))
+        self.assertFalse(utils.bool_from_str(None))
+        self.assertFalse(utils.bool_from_str('junk'))
+
 
 class IsUUIDLikeTestCase(test.TestCase):
     def assertUUIDLike(self, val, expected):

nova/utils.py

@@ -772,6 +772,17 @@ def is_uuid_like(val):
     return (len(val) == 36) and (val.count('-') == 4)
 
 
+def bool_from_str(val):
+    """Convert a string representation of a bool into a bool value"""
+
+    if not val:
+        return False
+    try:
+        return True if int(val) else False
+    except ValueError:
+        return val.lower() == 'true'
+
+
 class Bootstrapper(object):
     """Provides environment bootstrapping capabilities for entry points."""