From a4454ec81a44142db0c51ceb76b979ace4b1176e Mon Sep 17 00:00:00 2001
From: Joshua Harlow <harlowja@yahoo-inc.com>
Date: Sat, 16 Jun 2012 09:44:47 -0700
Subject: For the different base classes, ensure we are using the 'abc' module
 + appropriate annotations + metaclasses.

---
 cloudinit/sources/__init__.py | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'cloudinit/sources/__init__.py')

diff --git a/cloudinit/sources/__init__.py b/cloudinit/sources/__init__.py
index 55900119..46350255 100644
--- a/cloudinit/sources/__init__.py
+++ b/cloudinit/sources/__init__.py
@@ -20,6 +20,8 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import abc
+
 from cloudinit import importer
 from cloudinit import log as logging
 from cloudinit import user_data as ud
@@ -37,6 +39,9 @@ class DataSourceNotFoundException(Exception):
 
 
 class DataSource(object):
+
+    __metaclass__ = abc.ABCMeta
+
     def __init__(self, sys_cfg, distro, paths):
         self.sys_cfg = sys_cfg
         self.distro = distro
-- 
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