write_files: if no permissions are given, just use default without warn.

if no permissions were given in a write_files stanza, then
a warning would be emitted.

The fix here is just to special case handling of None.

2 files changed, 3 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 10bd58b8..8edf3249 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -124,6 +124,7 @@
  - Change missing Cheetah log warning to debug [Andrew Jorgensen]
  - Remove trailing dot from GCE metadata URL (LP: #1581200) [Phil Roche]
  - support network rendering to sysconfig (for centos and RHEL)
+ - write_files: if no permissions are given, just use default without warn.
 
 0.7.6:
  - open 0.7.6
diff --git a/cloudinit/config/cc_write_files.py b/cloudinit/config/cc_write_files.py
index 351cfc8c..b1096b9b 100644
--- a/cloudinit/config/cc_write_files.py
+++ b/cloudinit/config/cc_write_files.py
@@ -79,6 +79,8 @@ def write_files(name, files, log):
 
 
 def decode_perms(perm, default, log):
+    if perm is None:
+        return default
     try:
         if isinstance(perm, six.integer_types + (float,)):
             # Just 'downcast' it (if a float)