On Tue, Aug 27, 2013 at 8:44 AM, Tim Penhey <tim.pen...@canonical.com>wrote:
> Perhaps we should have a sanity-check type callback into the provider > with the constraints at the time we want to add a machine. This would > give the null provider the early fail mechanism, and could also allow > other providers to error if people as asking for constraints that really > don't make sense. > I'm sort of thinking out aloud here: maybe this could used for checking environment-specific constraints too? Some kind of "VerifyMachineConstraints" method that will ensure your add-machine/--to constraints are valid for the current provider/environment. In this case constraints may be nil, but the null provider would just always return false.
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