1 files changed, 26 insertions, 1 deletions
diff --git a/cloudinit/sources/__init__.py b/cloudinit/sources/__init__.py
index 87b8e524..d1395270 100644
--- a/cloudinit/sources/__init__.py
+++ b/cloudinit/sources/__init__.py
@@ -21,8 +21,8 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import abc
+import copy
 import os
-
 import six
 
 from cloudinit import importer
@@ -355,6 +355,31 @@ def instance_id_matches_system_uuid(instance_id, field='system-uuid'):
     return instance_id.lower() == dmi_value.lower()
 
 
+def convert_vendordata(data, recurse=True):
+    """data: a loaded object (strings, arrays, dicts).
+    return something suitable for cloudinit vendordata_raw.
+
+    if data is:
+       None: return None
+       string: return string
+       list: return data
+             the list is then processed in UserDataProcessor
+       dict: return convert_vendordata(data.get('cloud-init'))
+    """
+    if not data:
+        return None
+    if isinstance(data, six.string_types):
+        return data
+    if isinstance(data, list):
+        return copy.deepcopy(data)
+    if isinstance(data, dict):
+        if recurse is True:
+            return convert_vendordata(data.get('cloud-init'),
+                                      recurse=False)
+        raise ValueError("vendordata['cloud-init'] cannot be dict")
+    raise ValueError("Unknown data type for vendordata: %s" % type(data))
+
+
 # 'depends' is a list of dependencies (DEP_FILESYSTEM)
 # ds_list is a list of 2 item lists
 # ds_list = [