We were calling from PersistState into RefreshState, but RefreshState is
protected by the same lock as PersistState and so the call would deadlock.
Instead, we introduce a new entry point refreshState which can be used
when already holding the lock.
For historical reasons sometimes we have nil state in situations where
we'd still like to persist state snapshots to a store. To make life easier
for those callers, we'll substitute an empty state if we are given a nil
one, thus allowing us to still generate a valid serialization that will
load back in as an empty state.
Various things drifted since these tests were originally written. This
catches them up to the latest implementations of state decoding,
upgrading, etc.
An earlier change made the tests not compile here. We now need to use the
legacyPluginMap function, since pluginMap has now been replaced with
helpers to produce new-style plugin _sets_.
An earlier change introduced a new function testConfig to the main code
for this package, which conflicted with a function of the same name in
the test code.
Here we rename the function from the test code, allowing for the more
generally-named testConfig to be the one in the main code.
The test provider comes with a lot of baggage since it's designed to be
used as a plugin, so instead we'll just use the mock provider
implementation directly, and so we can (in a later commit) configure it
appropriately for what our tests need here.
Most of the functionality in this package has been obsoleted by equivalent
symbols in states/statemgr. We're keeping this package around for the
moment mainly just to house the type aliases in state.go.
The tests in here no longer work because they are written against the old
APIs. We will eventually remove the components these are testing too, but
we're keeping them around for the moment so that we don't break the build
for some leftover callers that are still depending on these.
The state manager refactoring in an earlier commit was reflected in the
implementations of these backends, but not in their tests. This gets us
back to a state where the backend tests will compile, and gets _most_ of
them passing again, with a few exceptions that will be addressed in a
subsequent commit.
It must now provide a basic implementation of plan and apply for its
mock provider, which in this case can just pass through the proposed value
generated by core because there are no computed attributes in this schema.
When we're being asked to destroy everything, we ideally want to end up
with a totally empty state. Normally we will conservatively keep around
the "husks" of resources (what's left after all of the instances have been
destroyed) unless they are configured without count or for_each, but in
this special case we'll prune those out.
The implication of this is that in "weird" expression contexts that happen
before the next "terraform plan", such as evaluation in
"terraform console" or expressions in data resources and provider blocks
that get evaluated during the refresh walk, we will see these results
as unknown rather than as empty lists of objects. We accept that weirdness
for now because in a future release we are likely to remove "refresh" as
a separate walk anyway, doing all of that work during the plan walk where
we can ensure that these values are properly re-populated before trying
to use them.
Some mock objects will not have any mock behavior configured for the
GetSchema method, so we should just return a valid-but-empty schema in
that case, rather than panicking as we did before.
These are similar to the symbols of the same name in package "providers".
terraform.ProvisionerFactory is now an alias for provisioners.Factory, so
we can defer updating all of the existing users of it.
There are still some errors left, because our expression evaluator now
does more validation than before and so we'll need to (in a subsequent
commit) actually use a fixture configuration for these tests so that the
validations will allow the expressions to be validated.
This is still not compileable because the test provider needs to be
updated to the new provider interface, but all the rest of the types are
now correct so we can update the test provider in a later commit to make
this work again.
incoming values
Addresses an odd state where the priorV of an object to be changed is
known but null.
While this situation should not happen, it seemed prudent to ensure that
core is resilient to providers sending incorrect values (which might
also occur with manually edited state).
We need to check for the known-ness of the prior value before we check for
the null-ness of actual, because it's valid for an unknown value to become
a null.
This test was occasionally failing due to a missing graph edge causing it
to be non-deterministic.
The graph edge was missing because our standard schema doesn't quite match
the config fixture and so the reference checker was not finding the "blah"
argument on aws_instance.a.
This change also includes an 100ms pause for the b node just to make this
potential race more likely to hit the "wrong" ordering when the graph is
not complete.
The weird special-case behaviors of testDiffFn were interfering with the
outcome of this test, but we don't actually need any of those special
behaviors here so we'll use a very simple PlanResourceChangeFn
implementation instead, just letting the built-in merge behavior in core
take care of it.
Since we started using experimental Go Modules our editor tooling hasn't
been fully functional, apparently including format-on-save support. This
is a catchup to get everything back straight again.
One of the assumptions this test was checking no longer holds: we don't
retain outputs for non-root modules in persistent state, because we can
always re-populate these on a future run by evaluating the configuration.
The old-fashioned formatting of "Provider" on the shimmed state here was
causing the state upgrade code to treat it like a module-relative address,
rather than an absolute address as we now expect.
This error message appears in a situation that is often confusing for
users, since the connection between resources and their providers in the
state is not something we draw attention to in the user experience of
Terraform.
This new error message tries to be a bit clearer about what the user must
do to resolve it. It's still not perfect since it doesn't cover the
variant of this problem where an entire module containing a provider block
and resources has been removed at the same time, but since there isn't
an easily-summarizable way to continue in that state this will need to
do for the moment, until we find a way to file off that rough edge in
the workflow.
Martin Atkins