dns: plan/apply with routing policy type change always fails

[kanata2]

Hi, I found a bug for google_dns_record_set with Routing Policy introduced in v4.21.0.
I'll send a Pull Request to fix this issue later.

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Terraform Version

$ terraform -v
Terraform v1.2.1
on darwin_amd64
+ provider registry.terraform.io/hashicorp/google v4.22.0

Affected Resource(s)

• google_dns_record_set

Terraform Configuration Files

# Copy-paste your Terraform configurations here.
#
# For large Terraform configs, please use a service like Dropbox and share a link to the ZIP file.
# For security, you can also encrypt the files using our GPG public key:
#    https://www.hashicorp.com/security
#
# If reproducing the bug involves modifying the config file (e.g., apply a config,
# change a value, apply the config again, see the bug), then please include both:
# * the version of the config before the change, and
# * the version of the config after the change.

## main.tf version 1
terraform {
  required_version = "1.2.1"
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "4.22.0"
    }
  }
}

variable "project" {
  type = string
}

provider "google" {
  project = var.project
  region  = "asia-northeast1"
}

resource "google_dns_record_set" "test" {
  managed_zone = "kanata2-example-com"
  name         = "test.kanata2.example.com."
  type         = "A"
  ttl          = 60
  rrdatas      = ["127.0.0.1"]
}

## main.tf version 2
terraform {
  required_version = "1.2.1"
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "4.22.0"
    }
  }
}

variable "project" {
  type = string
}

provider "google" {
  project = var.project
  region  = "asia-northeast1"
}

resource "google_dns_record_set" "test" {
  managed_zone = "kanata2-example-com"
  name         = "test.kanata2.example.com."
  type         = "A"
  ttl          = 60
  routing_policy {
    wrr {
      weight  = 0.8
      rrdatas = ["127.0.0.1"]
    }
    wrr {
      weight  = 0.2
      rrdatas = ["10.0.0.0"]
    }
  }
}

Debug Output

Paste on my gist: https://gist.github.com/kanata2/4529f5c5cc56927a53b7ba69b610424e

Panic Output

Expected Behavior

Success to apply.

Actual Behavior

Failed to apply changes, but tfstate is modified.

Steps to Reproduce

1. terraform apply with main.tf version1
2. terraform apply with main.tf version2

Important Factoids

Nothing.

References

• dns: Support Routing Policy in DNS Record Set GoogleCloudPlatform/magic-modules#5909

[shuyama1]

This should be fixed by GoogleCloudPlatform/magic-modules#6103. Closing this issue now. Feel free to reopen this issue if the bug still occurs after the fix is released to the providers.

[github-actions]

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