[Bug]: provider: (#39255) - Not allowing empty role_arn under assume_role block

[devdootkim]

Terraform Core Version

1.0.10 , 1.9.2

AWS Provider Version

v5.67.0

Affected Resource(s)

Terraform provider makes error with empty value of role_arn which is under assume_role block after merging the PR provider: (#39255)

Expected Behavior

Two types of terraform apply environment.

1. Command based apply
2. By using Atlantis system

For type 2.
assume_role block is uesd for Atlantis system.
The system gives role_arn value.
There is no issue.

For type 1.
Command based apply is using locally assumed aws role.
No need to assume role again via terraform provider so we made role_arn = "" (empty value).

By v5.66.0, There is no issue with this process.

Actual Behavior

Type 1, command based apply,
terraform provider does not allow empty value of role_arn.

│ Error: Missing required argument
│ 
│   with provider["registry.terraform.io/hashicorp/aws"],
│   on provider.tf line 4, in provider "aws":
│    4: provider "aws" {
│ 
│ The argument "role_arn" is required, but no definition was found.

Relevant Error/Panic Output Snippet

Initializing modules...

Initializing the backend...

Initializing provider plugins...
- terraform.io/builtin/terraform is built in to Terraform
- Reusing previous version of hashicorp/aws from the dependency lock file
- Using previously-installed hashicorp/aws v5.67.0

│ Error: Missing required argument
│ 
│   with provider["registry.terraform.io/hashicorp/aws"],
│   on provider.tf line 4, in provider "aws":
│    4: provider "aws" {
│ 
│ The argument "role_arn" is required, but no definition was found.

Terraform Configuration Files

provider "aws" {
  assume_role {
    role_arn     = var.assume_role_arn
  }
}
variable "assume_role_arn" {
  description = ""
  default     = ""
}

Steps to Reproduce

terraform init

Initializing modules...

Initializing the backend...

Initializing provider plugins...
- terraform.io/builtin/terraform is built in to Terraform
- Reusing previous version of hashicorp/aws from the dependency lock file
- Using previously-installed hashicorp/aws v5.67.0

terraform plan
(with below provider config)

provider "aws" {
  assume_role {
    role_arn     = var.assume_role_arn
  }
}
variable "assume_role_arn" {
  description = ""
  default     = ""
}

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[devdootkim]

Workaround works with terraform 1.9.2
cloudfoundry/bosh-bootloader@bd8bd52

│ Warning: Missing required argument
│ 
│   with provider["registry.terraform.io/hashicorp/aws"],
│   on provider.tf line 1, in provider "aws":
│    1: provider "aws" {
│ 
│ The argument "role_arn" is required, but no definition was found.
│ 
│ This will be an error in a future release.

Not work with 1.0.10

│ Error: Missing required argument
│ 
│   with provider["registry.terraform.io/hashicorp/aws"],
│   on provider.tf line 4, in provider "aws":
│    4: provider "aws" {
│ 
│ The argument "role_arn" is required, but no definition was found.

[devdootkim]

WorkAround success with older terraform

Terraform version 1.0.10
Provider version v5.67.0

provider "aws" {

  dynamic "assume_role" {
    for_each = var.assume_role_arn != "" ? [1] : []
    content {
      role_arn     = var.assume_role_arn
    }
  }
}
variable "assume_role_arn" {
  default     = ""
}

[YorickH]

Duplicate of #39296 ?

[devdootkim]

Duplicate of #39296 ?

Yes the same issue.
I added another workaround for this issue.

[gdavison]

This will be resolved by #39328. We're planning to release a bug fix update this Monday, 16 September.

In addition to the workarounds listed above, you can also set the value of var.aws_assume_role to null instead of "". For example:

variable "var.aws_assume_role" {
  type    = string
  default = null
}

[github-actions]

Warning

This issue has been closed, meaning that any additional comments are hard for our team to see. Please assume that the maintainers will not see them.

Ongoing conversations amongst community members are welcome, however, the issue will be locked after 30 days. Moving conversations to another venue, such as the AWS Provider forum, is recommended. If you have additional concerns, please open a new issue, referencing this one where needed.

[github-actions]

This functionality has been released in v5.68.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!