whitespace at end of vpc_id causes object to be destroyed and recreated endlessly

[hashibot]

This issue was originally opened by @wjimenez5271 as hashicorp/terraform#9982. It was migrated here as part of the provider split. The original body of the issue is below.

---

consider if you have the following aws_subnet resource:

resource "aws_subnet" "mysubnet" {
    vpc_id = "vpc-65b14a03"
    cidr_block = "10.0.0.0/24"
    availability_zone = "us-west-2a"
    tags {
        Name = "mysubnet"
    }
}

and you accidentally add some whitespace to the vpc_id parameter like so

resource "aws_subnet" "mysubnet" {
    vpc_id = "vpc-65b14a03 "
    cidr_block = "10.0.0.0/24"
    availability_zone = "us-west-2a"
    tags {
        Name = "mysubnet"
    }
}

It seems terraform will create the resource on one iteration, next iteration delete and recreate it, and this will continue endlessly.

I can imagine that perhaps the AWS API strips the whitespace and so it is able to create the resource, however terraform state knows it as a string with that whitespace, which causes it to be a mismatch next time around. Ideally it would be nice if terraform would present the user with an error when this whitespace is present, otherwise it is difficult to identify the problem based on the behavior.

[github-actions]

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[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!