Error on plan for google_compute_region_instance_group_manager from docs - insufficient items for attribute "version"

[chrisbenincasa]

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Terraform Version

✗) terraform -v
Terraform v0.12.6
+ provider.external v1.2.0
+ provider.google v2.12.0
+ provider.google-beta v2.12.0

Affected Resource(s)

• google_compute_region_instance_group_manager

Terraform Configuration Files

resource "google_compute_region_instance_group_manager" "teletracker_backend_instance_group_manager" {
  provider = "google-beta"
  name     = "teletracker-api-${var.env}"

  base_instance_name = "teletracker-api-"
  region             = "us-east1"

  version {
    name              = "teletracker-api-${var.env}-main"
    instance_template = "${google_compute_instance_template.teletracker_backend_instance_template.self_link}"
    target_size {
      fixed = 1
    }
  }
}

Debug Output

https://gist.github.com/chrisbenincasa/645252d3546c4a8609e8189629fc8e11

Expected Behavior

The plan should have succeeded.

Actual Behavior

The plan fails with:

Error: insufficient items for attribute "version"; must have at least 1

Steps to Reproduce

1. terraform plan

[chrisbenincasa]

Could be an instance of: hashicorp/terraform-provider-aws#8982

[rileykarson]

I'm not seeing this issue locally. I attempted to repro with your config, as well as the following:

resource "google_compute_region_instance_group_manager" "teletracker_backend_instance_group_manager" {
  provider = "google-beta"
  name     = "teletracker-api-${var.env}"

  base_instance_name = "teletracker-api"
  region             = "us-east1"

  target_size = 1

  version {
    name              = "teletracker-api-${var.env}-main"
    instance_template = "${google_compute_instance_template.teletracker_backend_instance_template.self_link}"
  }
}

I'll track the upstream issue to see if this is due to something on the provider side, and close this out if it's not looking like it is.

[rileykarson]

Actually, I'm able to repro based on hashicorp/terraform-provider-aws#9048 (comment).

Running terraform import without provider=google-beta appears to be the cause.

terraform import defaults to importing using the google provider regardless of what you've set in config. Because the version field isn't present in the google provider, we're mostly importing the resource correctly but not setting that specific field.

It's required in the google-beta provider, though, and that appears to be causing an issue when Terraform coerces the state representation from the old SDK -> the new SDK, and performs a validation that didn't exist pre-0.12. That's happening at https://github.com/hashicorp/terraform/blob/587852773210f95268368a860f8bf837e6d11acf/configs/configschema/coerce_value.go#L120.

If you clear the resource from state with terraform state rm and import it again with provider=google-beta, this should work.

[chrisbenincasa]

Ah yes, that was exactly it! Thank you!

[rileykarson]

Great, glad to hear!

Since there's no provider-side resolution other than waiting until hashicorp/terraform#22387 is fixed, I'm going to close this out.

[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. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!