Once you start reading from stdin, that is a blocking call that will
never finish. So when a context is canceled causing the input method to
return, the read will remain blocking in the running goroutine.
There isn't a real solution for it (e.g. its not possible to unblock the
read) so the only solution is to make the reader reusable.
The count for a data resource can potentially depend on a managed resource
that isn't recorded in the state yet, in which case references to it will
always return unknown.
Ideally we'd do the data refreshes during the plan phase as discussed in
#17034, which would avoid this problem by planning the managed resources
in the same walk, but for now we'll just skip refreshing any data
resources with an unknown count during refresh and defer that work to the
apply phase, just as we'd do if there were unknown values in the main
configuration for the data resource.
By upgrading this to a version that supports Go Modules, we can avoid
the redundant dependencies labix.org/v2/mgo and launchpad.net/gocheck.
These dependencies come via hashicorp/consul, which we have vendored for
the Consul backend.
There are no changes to the go-msgpack code here; we're just adopting a
newer version that has a go.mod present so that its dependencies can be
determined more accurately.
* internal/initwd: follow local module path symlink
Fixes#21060
While a previous commit fixed a problem when the local module directory
contained a symlink, it did not account for the possibility that the
entire directory was a symlink.
Make sure values removed from a map during apply are not copied into the
new map. The broken test is no longer valid in this case, and the
updated diff.Apply should prevent the case it used to cover.
removeConfigUnknowns need to remove the value completely from the config
map. Removing this value allows GetOk and GetOkExists to indicate if the
value was set in the config in the case of an Optional+Computed
attribute.
There was some leftover v0.11-style interpolation syntax here.
We prefer to use a "naked" expression in situations like this where the result
isn't a string, because interpolations returning non-strings is a common source
of confusion for new users.
Earlier on in the v0.12 development cycle we made the decision that the
validation walk should consider input values to always be unknown so that
validation is checking validity for all possible inputs rather than for
a specific set of inputs; checking for a specific set of inputs is the
responsibility of the plan walk.
However, we didn't implement that in the best way: we made the
"terraform validate" command force all of the input variables to unknown
but that was insufficient because it didn't also affect the implicit
validation walk we do as part of "terraform plan" and "terraform apply",
causing those to produce confusingly-different results.
Instead, we'll address the problem directly in the reference resolver code,
ensuring that all variable values will always be treated as an unknown
(of the declared type, so type checking is still possible) during any
validate walk, regardless of which command is running it.
Previously we were trying to access a field of the analysis object before
checking if analysis produced errors. The analysis function usually
returns a nil analysis on error, so this would result in a panic whenever
that happened.
Now we'll dereference the analysis object pointer only after checking for
errors, so we'll get a chance to report the analysis error to the user.
The expression upgrade functionality mostly ignores comments because in
the old language the syntax prevented comments from appearing in the
middle of expressions, but there was one exception: object expressions.
Because HCL 1 used ObjectType both for blocks and for object expressions,
that is the one situation where something we consider to be an expression
could have inline attached comments in the old language.
We migrate these here so we don't lose these comments that don't appear
anywhere else. Other comments get gathered up into a general comments
set maintained inside the analysis object and so will be printed out as
required _between_ expressions, just as they did before.
We previously attempted to make the special diff apply behavior for nested
sets of objects work with attribute mode by totally discarding attribute
mode for all shims.
In practice, that is too broad a solution: there are lots of other shimming
behaviors that we _don't_ want when attribute mode is enabled. In
particular, we need to make sure that the difference between null and
empty can be seen in configuration.
As a compromise then, we will give all of the shims access to the real
ConfigMode and then do a more specialized fixup within the diff-apply
logic: we'll construct a synthetic nested block schema and then use that
to run our existing logic to deal with nested sets of objects, while
using the previous behavior in all other cases.
In effect, this means that the special new behavior only applies when the
provider uses the opt-in ConfigMode setting on a particular attribute,
and thus this change has much less risk of causing broad, unintended
regressions elsewhere.
When an operation fails, providers may return a null new value rather than
returning a partial state. In that case, we'd prefer to keep the old value
so that we stand the best chance of being able to retry on a subsequent
run.
Previously we were making an exception for the delete action, allowing
the result of that to be null even when an error is returned. In practice
that was a bad idea because it would cause Terraform to lose track of the
object even though it might not actually have been deleted.
Now we'll retain the old object even in the delete case. Providers can
still return partial new objects if they were able to partially complete
a delete operation, in which case we'll discard what we had before, but
if the result is null with errors then we'll assume the delete failed
entirely and so just keep the old state as-is, giving us the opportunity
to refresh it on the next run to see if anything actually happened after
all.
(This also includes a new resource in the test provider which isn't used
by the patch but was useful for some manual UX testing here, so I thought
I'd include it in case it's similarly useful in future, given how simple
its implementation is.)
Due to the lossiness of our legacy models for diff and state, shimming a
diff and then creating a state from it produces a different result than
shimming a state directly. That means that ImportStateVerify no longer
works as expected if there are any Computed attributes in the schema where
d.Set isn't called during Read.
Fixing that for every case would require some risky changes to the shim
behavior, so we're instead going to ask provider developers to address it
by adding `d.Set` calls where needed, since that is the contract for
"Computed" anyway -- a default value should be produced during Create, and
thus by extension during Import.
However, since a common situation where this occurs is attributes marked
as "Removed", since all of the code that deals with them has generally
been deleted, we'll avoid problems in that case here by treating Removed
attributes as ignored for the purposes of ImportStateVerify.
This required exporting some functionality that was formerly unexported
in helper/schema, but it's a relatively harmless schema introspection
function so shouldn't be a big deal to export it.
The division operator now always performs floating point division, whereas
before it would choose between float and int division based on the types
of its arguments.
We have a specific error message for when a fractional number is used as
an index in HCL, but this additional upgrade guidance provides a specific
solution to the problem: the floor function.
Sadly we don't have enough context in the current design of the upgrade
tool to make this fix automatic. With some refactoring it may be possible
to apply the fix automatically within list brackets, but since that is
a relatively complex change we'll first try this manual solution prompted
by an error message, because in practice so far we've seen this reported
only in the context of list indexing and our error check will catch that
and make the user aware of the need for a fix there.
Sander van Harmelen