* Fix issues in Cloudwatch Log Group tag
1) Removing tags from terraform doesn’t actually get removed in AWS
2) Trying to update a tag with empty value (“”) to a non-empty value
causes terraform to loop forever
The issue was caused by a mixup of using tag values where tag name
should have used and is corrected in this patch.
This patch also removes the comparison of old and new tag values,
because AWS api takes care of updates by itself and there is no need to
perform an unnecessary UnTag API to update an existing tag value
* Updated the test cases to cover the removal and empty update scenarios
* provider/aws: output the log group name when create fails
* adjusted formatting to match other error output
* fixup detailed error message for ResourceAlreadyExistsException
* forgot an import
* show the log group name regardless of error type
According to https://github.com/hashicorp/errwrap
'{{err}}' has to be used instead of '%s'
Without this patch, error output from terraform is missing important information:
* aws_cloudwatch_log_group.logs: Error Getting CloudWatch Logs Tag List: %s
With this patch, I get the important information. E.g.:
* aws_cloudwatch_log_group.logs: Error Getting CloudWatch Logs Tag List: AccessDeniedException: User: arn:aws:sts::XYZ:assumed-role/AAA-BBB-CCC/terraform-assuming-role-assume-role-ReadOnly is not authorized to perform: logs:ListTagsLogGroup on resource: arn:aws:logs:us-east-1:XYZ:log-group:logs:log-stream:
Fixes#7543 where creating a CloudWatch Group, then deleting it from the
console will cause no action on refresh / plan
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSCloudWatchLogGroup_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v
-run=TestAccAWSCloudWatchLogGroup_ -timeout 120m
=== RUN TestAccAWSCloudWatchLogGroup_importBasic
--- PASS: TestAccAWSCloudWatchLogGroup_importBasic (18.10s)
=== RUN TestAccAWSCloudWatchLogGroup_basic
--- PASS: TestAccAWSCloudWatchLogGroup_basic (17.34s)
=== RUN TestAccAWSCloudWatchLogGroup_retentionPolicy
--- PASS: TestAccAWSCloudWatchLogGroup_retentionPolicy (49.81s)
=== RUN TestAccAWSCloudWatchLogGroup_multiple
--- PASS: TestAccAWSCloudWatchLogGroup_multiple (23.74s)
=== RUN TestAccAWSCloudWatchLogGroup_disappears
--- PASS: TestAccAWSCloudWatchLogGroup_disappears (15.78s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 124.789s
```
johnthedev97