Hi Folks, Just merged a new charm helper that I wanted to highlight. I've seen quite a few charms tracking state in various ways, from ad hoc files per setting to the config settings helper, which leads to some charms having a half-dozen state tracking files. Ideally charms can be written such that they just consider current state and write out and effect. However its quite natural for some charms to have the need for local state as they need to consider the application of deltas from multiple sources to the state they've already achieved on a unit.
The charmhelper unitdata.py provides a versioned, transactional, kv store for a unit backed by a single sqlite file. It provides methods for returning deltas against previously known values to simplify delta calculation and application by charm. Docs embedded in implementation link below, feedback welcome. http://goo.gl/B0AdTR cheers, Kapil
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