Simple checks for instance user data.

Check that instance user data wont be truncated, and that it is
valid base64 data. This partially resolves bug 1035055. I don't
love the hard coded maximum length, but I haven't worked out how
to get sqlalchemy to tell me the maximum size of the data type.

Change-Id: I045d6b4481563d01cae371cf61a91781cfed6f4b

1 files changed, 10 insertions, 0 deletions

diff --git a/nova/exception.py b/nova/exception.py
index 315147764..de8982488 100644
--- a/nova/exception.py
+++ b/nova/exception.py
@@ -1155,6 +1155,16 @@ class ConfigDriveUnknownFormat(NovaException):
                 "iso9660 or vfat.")
 
 
+class InstanceUserDataTooLarge(NovaException):
+    message = _("User data too large. User data must be no larger than "
+                "%(maxsize)s bytes once base64 encoded. Your data is "
+                "%(length)d bytes")
+
+
+class InstanceUserDataMalformed(NovaException):
+    message = _("User data needs to be valid base 64.")
+
+
 def get_context_from_function_and_args(function, args, kwargs):
     """Find an arg of type RequestContext and return it.