Inheritance of image properties from the image an instance was booted
from to an image created from that instance is governed by the
non_inheritable_image_properties configuration option. However, there
are some image properties (for example, those used for image signature
validation or to reference a cinder encryption key id) which it makes
no sense to inherit under any circumstances. Additionally,
misconfiguration of the non-inheritable properties can lead to data
loss under the circumstances described in Bug #1852106. So it would
be better if these properties were not subject to configuration.
The initial set of absolutely non-inheritable image properties
consists of those associated with cinder encryption keys and image
signature validation.
Change-Id: I4332b9c343b6c2b50226baa8f78396c2012dabd1
Closes-bug: #1852106
bc29084012