Comment 2 for bug 1633656

cloud-init doesn't currently support providing networking configuration in user-data.
It does though allow providing network-config through the 'NoCloud' datasource (which uvtool uses).

So we could extend uvtool to add a '--network-config' parameter like it's user-data that would then put the provided 'network-config' into the 'seed'.

The content of network-config is the format described at
 http://curtin.readthedocs.io/en/latest/topics/networking.html

I'm going to open a uvtool task for this bug.

This woudl be nice function to have.

Sorry for the slow reply.