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, 5 insertions, 1 deletions

diff --git a/cloudinit/config/cc_final_message.py b/cloudinit/config/cc_final_message.py
index aff03c4e..6b864fda 100644
--- a/cloudinit/config/cc_final_message.py
+++ b/cloudinit/config/cc_final_message.py
@@ -28,7 +28,7 @@ frequency = PER_ALWAYS
 
 # Cheetah formated default message
 FINAL_MESSAGE_DEF = ("Cloud-init v. ${version} finished at ${timestamp}."
-                     " Up ${uptime} seconds.")
+                     " Datasource ${datasource}.  Up ${uptime} seconds")
 
 
 def handle(_name, cfg, cloud, log, args):
@@ -51,6 +51,7 @@ def handle(_name, cfg, cloud, log, args):
             'uptime': uptime,
             'timestamp': ts,
             'version': cver,
+            'datasource': str(cloud.datasource),
         }
         util.multi_log("%s\n" % (templater.render_string(msg_in, subs)),
                        console=False, stderr=True)
@@ -63,3 +64,6 @@ def handle(_name, cfg, cloud, log, args):
         util.write_file(boot_fin_fn, contents)
     except:
         util.logexc(log, "Failed to write boot finished file %s", boot_fin_fn)
+
+    if cloud.datasource.is_disconnected:
+        log.warn("Used fallback datasource")