* provider/aws: Add support for treat_missing_data to cloudwatch_metric_alarm
Fixes: #13263
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSCloudWatchMetricAlarm'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/04/05 08:51:06 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSCloudWatchMetricAlarm -timeout 120m
=== RUN TestAccAWSCloudWatchMetricAlarm_importBasic
--- PASS: TestAccAWSCloudWatchMetricAlarm_importBasic (23.93s)
=== RUN TestAccAWSCloudWatchMetricAlarm_basic
--- PASS: TestAccAWSCloudWatchMetricAlarm_basic (27.81s)
=== RUN TestAccAWSCloudWatchMetricAlarm_treatMissingData
--- PASS: TestAccAWSCloudWatchMetricAlarm_treatMissingData (43.39s)
=== RUN TestAccAWSCloudWatchMetricAlarm_extendedStatistic
--- PASS: TestAccAWSCloudWatchMetricAlarm_extendedStatistic (26.80s)
=== RUN TestAccAWSCloudWatchMetricAlarm_missingStatistic
--- PASS: TestAccAWSCloudWatchMetricAlarm_missingStatistic (5.95s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 127.899s
```
* provider/aws: Set cloudwatch_metric_alarm treamt_missing_data to missing
This follows what the AWS API does. We had to add a state migration for
this to make sure that the user doesn't see any unexpected activity on
their Terraform plans
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAWSCloudWatchMetricAlarmMigrateState'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/04/05 14:51:32 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAWSCloudWatchMetricAlarmMigrateState -timeout 120m
=== RUN TestAWSCloudWatchMetricAlarmMigrateState
2017/04/05 14:52:13 [INFO] Found AWS CloudWatch Metric Alarm State v0; migrating to v1
2017/04/05 14:52:13 [DEBUG] Attributes before migration: map[string]string{}
2017/04/05 14:52:13 [DEBUG] Attributes after migration: map[string]string{"treat_missing_data":"missing"}
--- PASS: TestAWSCloudWatchMetricAlarmMigrateState (0.00s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 0.018s
```
The AWS waiter package has changed location in the 1.8.0 version of the
SDK. DMS will need to mitigate a breaking change because of this
Between @radeksimko and myself, we think that we should migrate the DMS
resources to using the Terraform state refresh func pattern that is used
across the entire of the AWS provider. DMS is the *only* resource that
currently uses the AWS waiters, so the LOE to migrate is pretty low
This previously lacked tests altogether. This new test verifies the
"happy path", ensuring that both literal and computed values pass through
correctly into the VariableValues map.
This crash resulted because the type switch checked for either of two
types but the type assertion within it assumed only one of them.
A straightforward (if inelegant) fix is to simply duplicate the relevant
case block and change the type assertion, thus allowing the types to match
up in all cases.
This fixes#13297.
A couple commits got rebased together here, and it's easier to enumerate
them in a single commit.
Skip copying of states during migration if they are the same state. This
can happen when trying to reconfigure a backend's options, or if the
state was manually transferred. This can fail unexpectedly with locking
enabled.
Honor the `-input` flag for all confirmations (the new test hit some
more). Also unify where we reference the Meta.forceInitCopy and transfer
the value to the existing backendMigrateOpts.force field.
During the input walk we stash the values resulting from user input
(if any) in the eval context for use when later walks need to resolve
the provider config.
However, this repository of input results is only able to represent
literal values, since it does not retain the record of which of the keys
have values that are "computed".
Previously we were blindly stashing all of the results, failing to
consider that some of them might be computed. That resulted in the
UnknownValue placeholder being misinterpreted as a literal value when
the data is used later, which ultimately resulted in it clobbering the
actual expression evaluation result and thus causing the provider to
fail to configure itself.
Now we are careful to only retain in this repository the keys whose values
are known statically during the input phase. This eventually gets merged
with the dynamic evaluation results on subsequent walks, with the dynamic
keys left untouched due to their absence from the stored input map.
This fixes#11264.
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