Add the "None" datasource

The None datasource is the last resort fallback datasource.  It is
identifiable by a property 'is_disconnected' that indicates that the
datasource used is "not connected to a datasource".

This will allow any thing that needs to run to still run in the absense
of a DataSource.

Also, we add a logging of the datasource found in final_message, and
a warning if the None datasource is found.

LP: #906669

1 files changed, 4 insertions, 0 deletions

diff --git a/cloudinit/sources/__init__.py b/cloudinit/sources/__init__.py
index b25724a5..ca9f58e5 100644
--- a/cloudinit/sources/__init__.py
+++ b/cloudinit/sources/__init__.py
@@ -65,6 +65,10 @@ class DataSource(object):
             self.userdata = self.ud_proc.process(raw_data)
         return self.userdata
 
+    @property
+    def is_disconnected(self):
+        return False
+
     def get_userdata_raw(self):
         return self.userdata_raw