joshualyleturns out I was looking in the wrong place. the setup.py install script uses system_info() as well to determine the OS variant and then just sets that in the cloud.cfg file at the time of setup.py install. If it is removed in cloud.cfg, it will fallback to ubuntu00:05
Gonerihttps://github.com/canonical/cloud-init/pull/62 is ready for review17:38

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