Bug: aws_db_option_group: cannot update tags

[sjauld]

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Terraform Version

Terraform v0.11.11
+ provider.aws v1.55.0

Affected Resource(s)

• aws_db_option_group

Terraform Configuration Files

provider "aws" {
  region  = "ap-southeast-2"
  version = "~> 1.55"
}

resource "aws_iam_role" "rds_backup" {
  name = "DemoRDSServiceRoleForBackup"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "rds.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
EOF
}

resource aws_db_option_group "buggy" {
  name                     = "buggy-option-group"
  option_group_description = "A terraform example"
  engine_name              = "sqlserver-web"
  major_engine_version     = "14.00"

  option {
    option_name = "SQLSERVER_BACKUP_RESTORE"

    option_settings {
      name  = "IAM_ROLE_ARN"
      value = "${aws_iam_role.rds_backup.arn}"
    }
  }

  tags {
    colour = "green"
  }
}

Debug Output

https://gist.github.com/sjauld/21e2fbae17aab4b21c65f38fc68d402b

Panic Output

Expected Behavior

Should have been able to change the tag from "green" to "blue" and it would have successfully updated.

Actual Behavior

Error: Error applying plan:

1 error(s) occurred:

* aws_db_option_group.buggy: 1 error(s) occurred:

* aws_db_option_group.buggy: Error modifying DB Option Group: InvalidParameterValue: At least one option must be added, modified, or removed.
        status code: 400, request id: 70ca9ca3-0e02-4482-92a9-fd4f657a1cbc

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.

Steps to Reproduce

1. terraform apply
2. change the tag from green to blue
3. terraform apply

Important Factoids

References

• #0000

[bflad]

Pull request submitted: #7125

[bflad]

The fix for this has been merged and will release with version 1.56.0 of the Terraform AWS provider, likely middle of this week. 👍

[bflad]

This has been released in version 1.56.0 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!