If the state file contained a VPC or a route table which no longer
exists, Terraform would fail to create the correct plan, which is to
recreate them.
In the case of VPCs, this was due to incorrect error handling. The AWS
SDK returns a aws.APIError, not a *aws.APIError on error. When the VPC
no longer exists, upon attempting to refresh state Terraform would
simply exit with an error.
For route tables, the provider would recognize that the route table no
longer existed, but would not make the appropriate call to update the
state as such. Thus there'd be no crash, but also no plan to re-create
the route table.
cc/ @deoxxa see diff for how to add tests – quite straight forward.
Normally, I would like to add a check to ensure that the attribute
was updated remotely (by seeing what it's value with AWS is) but
I don't think we have that value returned.
Mitchell Hashimoto