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Excerpts from David Shrewsbury's message of 2014-04-22 10:16:42 -0700:
> Hi,
> 
> I'm working on implementing rebuild() in the nova.virt.ironic driver so
> that we can support the --preserve-ephemeral option. I have a design
> question and would love some feedback on it.
> 
> The way to trigger a deploy is to set the provision state to ACTIVE.
> However, for a rebuild, we cannot currently use this, since the API will
> return an error saying that the target state and the current provision
> state are the same, and return an error.
> 
> I can think of a couple of ways around this:
> 
> (1) If target and current provision state are ACTIVE, go ahead and allow
> the (re)deploy.
> 
> (2) Add a new provision state that would set the instance to a sort of
> temporary limbo state, expecting to be redeployed at some point by setting
> target to ACTIVE (as normal).

I'm not familiar with Ironic's internals, but I think rebuild is a
special state, since it involves a pretty violent change to the box
(overwriting the disks) that is definitely not the same as being in an
ACTIVE state where the user might expect it would be working.