Now that we don't have to handle data sources that may or may not have
been updated during a refresh phase, and the plan phase can save the
data source to the refreshed state, we can remove a lot of the logic
involved in detecting whether the data source needs to be planned or
not.
When there is no separate refresh phase, we always must attempt to read
the data source during planning, and the only conditions are based on
having a known configuration, and not having any dependencies on which
we're waiting. If the data source is read during plan, we can now save
that directly to the refreshed state, and don't need to smuggle the
value as a change to be saved during apply.
This commit adds an `alltrue` function to Terraform configuration. A
reason we might want this function is because it will enable more
powerful custom variable validations. For example:
```hcl
variable "amis" {
type = list(object({
id = string
}))
validation {
condition = (alltrue([
for a in var.amis : length(a.id) > 4 && substr(a.id, 0, 4) == "ami-"
]))
error_message = "The ID of at least one AMI was invalid."
}
}
```
Now that the planning process generates a refreshed state, and can
handle changes between the configuration and the state which the refresh
process cannot, we can use the plan for the refresh command.
Treat any reference from a data source to a managed resource as a
dependency on the entire resource. While a resource's
attribute may be statically resolvable from the configuration, if the
user added a reference to that resource, it stands to reason that the
user intended there to be a dependency which we need to wait on.
This is an extension of an implicit behavior that existed previously in
Terraform, but was lost in the 0.13 release. That behavior was emergent
from the fact that the Refresh walk did not process the configuration
for managed resources, so any new resources in the config would be
evaluate as entirely unknown during Refresh, even if some attributes
were statically resolvable at that point.
This new implementation restores the old behavior, and extends it to
updates and replacements of the referenced resource.
This only changes the refreshed state stored in the plan file. Since the
change is stored in the plan, the applied result would be the same, but
we should still store the refreshed data in the plan file for tools that
consume the plan file.
This will also be needed in order to implement a new refresh command
based on the plan itself.
The prior state recorded in the plans did not match the actual prior
state. Make the plans and state match depending on whether there was
existing state or not.
Since the refreshed state is now an artifact of the plan process, it
makes sense to add it to the Plan type, rather than adding an additional
return value to the Context.Plan method.
All resources use EvalWriteState to store their state, so we need a way
to switch the states when the resource is refreshing vs when it is
planning. (this will likely change once we factor out the EvalNode pattern)
Since plan uses the state as a scratch space for evaluation, we need an
entirely separate state to store the refreshed resources values during
planning. Add a RefreshState method to the EvalContext to retrieve a
state used only for refreshing resources.
While we like codecov, and the coverage goals, we've frequently ignored
the failures for various reasons. These have confused community members
submitting PRs and it can be confusing to look at a list of merged PRs
with the big X indicating failed checks ("confusing" isn't really a
problem, but if there were actually a bad merge, it could be hard to
find which in a list of commits actually had an important failure).
Fixes a mild inconvenience.
James Bardin