There's still a lot of work to do here around both the UX and the
follow-up steps that need to happen after installation completes, but this
is enough to faciliate some initial end-to-end testing of the new-style
install process.
We cannot evaluate expansion during validation, since the values may not
be known at that time.
Inject a nodeValidateModule, using the "Concrete" pattern used for other
node types during graph building. This node will always evaluate to a
single module instance, so that we have a valid context within which to
evaluate all sub resources.
Make the expansion logic easier to follow, keeping the evaluation and
registration local to switch cases. We don't validate anything between
count or for_each (config loading should handle that), and we don't need
to keep relying on the count == -1 sentinel value.
os.NewFile was called on file descriptors 3, 4, and 5 during every init,
in case this process happened to be running inside panicwrap. If the
runtime has already chosen one of these file descriptors to use
internally, starting polling on them can cause the runtime to crash.
Initialize the file descriptors lazily, only if we know that they belong
to us, after Wrapped is checked.
Replace the graphNodeRoot for the main graph with a nodeCloseModule for
the root module. USe a new transformer as well, so as to not change any
behavior of DynamicExpand graphs.
Closing out the root module like we do with sub modules means we no
longer need the OrphanResourceTransformer, or the NodeDestroyResource.
The old resource destroy logic has mostly moved into the instance nodes,
and the remaining resource node was just for cleanup, which need to be
done again by the module since there isn't always a NodeDestroyResource
to be evaluated.
The more-correct state caused a few tests to fail, which need to be
cleaned up to match the state without empty resource husks.
There is not one more non-dependent type to look for when pruning unused
values. This fixes the oversight, but still leaves the ugly concrete
type checking which we need to remove.
During plan, anything dependent on a module can connect to the module
expansion node, because all instance nodes are created during
DynamicExpand. During apply the instance nodes are created from the
diff, so we need a root module to terminate the logical module subgraph.
Besides providing an anchor for the completion of a module, the
nodeCloseModule can also be used to cleanup the orphan resource and
module placeholders in the state.
NodeDestroyResource does not require a provider, and to avoid this a
temporary GraphNodeNoProvider was used to differentiate it from other
resource nodes. We can now de-couple the destroy node from the abstract
resource which was adding the ProvidedBy method, and remove the
NoProvider method.
Terraform 0.13 will allow the installation of providers from various
sources. If a user updates their configuration to change the source of
an in-use provider (for example, if the provider namespace changes),
they will also need to update the state file accordingly.
This commit introduces a new `state replace-provider` subcommand which
supports this. All resources using the `from` provider will be updated
to use the `to` provider.
Martin Atkins