aws_lambda_alias try and fail being updated in line when Lambda function name is changed

[gileri]

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Terraform Version

Terraform v0.12.9

• provider.aws v2.30.0

Affected Resource(s)

• aws_lambda_alias

Terraform Configuration Files

resource "aws_lambda_function" "example" {
  function_name = "example"
 # Other attributes
}

resource "aws_lambda_alias" "example_prod" {
  name             = "prod"
  function_name    = aws_lambda_function.example.arn
  function_version = "$LATEST"
}

Expected Behavior

Terraform should I believe :

1. Destroy the lambda alias
2. Destroy the lambda function
3. Create the lambda function
4. Create the alias

Actual Behavior

  # aws_lambda_function.example must be replaced
-/+ resource "aws_lambda_function" "example" {
      ~ arn                            = "arn:aws:lambda:eu-central-1:1234:function:example" -> (known after apply)
      ~ function_name                  = "example" -> "example-new" # forces replacement
[...]
  # aws_lambda_alias.example_prod will be updated in-place
  ~ resource "aws_lambda_alias" "transactional_retry_prod" {
        arn              = "arn:aws:lambda:eu-central-1:1234:function:example:prod"
      ~ function_name    = "arn:aws:lambda:eu-central-1:1234:function:example" -> (known after apply)
        function_version = "$LATEST"
        id               = "arn:aws:lambda:eu-central-1:1234:function:example:prod"
        invoke_arn       = "<ARN>"
        name             = "prod"
    }
[

Error: Error updating Lambda alias: ResourceNotFoundException: Alias not found: arn:aws:lambda:eu-central-1:1234:function:example:prod
        status code: 404, request id: 00c68f23-32ed-437d-a18d-a84f27ba9a54

  on example.tf line 31, in resource "aws_lambda_alias" "example_prod":
  31: resource "aws_lambda_alias" "example_prod" {

Steps to Reproduce

1. Create a lambda, and an lambda alias
2. terraform apply
3. Change the function_name of the lambda in Terraform.
4. terraform apply

References

• Provider attempts to update in line when Lambda alias name is changed #4090 look similar to this one. I'm not sure, but I think that adding ForceNew: true to the function_name attribute of aws_lambda_alias should solve the issue.

[bflad]

The fix for this has been merged and will release with version 2.54.0 of the Terraform AWS Provider, later this week. Thanks to @eservent for the implementation. 👍

[ghost]

This has been released in version 2.54.0 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 for triage. Thanks!

[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!