[Bug]: aws_autosacling_group - validation desiredCapacityType incorrect

[hans-d]

Terraform Core Version

1.5.7

AWS Provider Version

5.45.0, 5.46.0, 5.47.0, 5.48.0, 5.49.0

Affected Resource(s)

aws_autoscaling_group

Expected Behavior

examples as on https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/autoscaling_group work

Actual Behavior

Validation error

Relevant Error/Panic Output Snippet

Error: updating Auto Scaling Group: operation error Auto Scaling: UpdateAutoScalingGroup, https response error StatusCode: 400, RequestID: 26d074bd-e530-4453-a76f-a03e1f94fcc8, api error ValidationError: 1 validation error detected: Value '' at 'desiredCapacityType' failed to satisfy constraint: Member must have length greater than or equal to 1

Terraform Configuration Files

see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/autoscaling_group

Steps to Reproduce

apply

Debug Output

No response

Panic Output

No response

Important Factoids

The mention variable is optional, but the validation used makes it mandatory

References

https://github.com/hashicorp/terraform-provider-aws/blame/feecd0b738afe3275a54ce2f4c8d3dcb8414014d/internal/service/autoscaling/group.go#L106

Would you like to implement a fix?

None

[github-actions]

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[rctunisi]

Ive got the same issue. It seems that the default values are being set to null, but the default api values for desired_capacity_types for both CreateAutoscalingGroup and UpdateAutoscalingGroup is units

Update: any console changes to asg are setting desired_capacity_types value, so terraform detects this as a drift and tries to revert that to null, causing the error above

Ref on default values: https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_CreateAutoScalingGroup.html
https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_UpdateAutoScalingGroup.html

[justinretzolk]

Hey @hans-d 👋 Thank you for taking the time to raise this! Can you supply a sample configuration that can be used to reproduce this and/or debug logging? That information will be useful for whoever picks this up.

[herrbpl]

This bug seems to have been here since instance requirement support was added. I have had problems with this for ages..