[BUG] Service account created doesn't have the correct name

[griseau]

TL;DR

When specifying a service_account_name, with create_service_account = True the created service account doesn't have the correct name, and the node pool is waiting for the service_account_name that you provided. This results in the inability to set a service_account_name.

Expected behavior

When specifying a service_account_name, the created service_account has the correct name, and is the one used by the node pool

Observed behavior

Node pool is using correct service_account_name, but the service account created is not the correct one.

Terraform Configuration

module "gke" {
  source  = "terraform-google-modules/kubernetes-engine/google//modules/private-cluster"
  version = "25.0.0"
  depends_on = [
    google_project_iam_member.roles
  ]
  name                       = var.cluster_name
  project_id                 = var.project_id
  network                    = var.cluster_network
  subnetwork                 = var.cluster_subnetwork
  ip_range_pods              = var.cluster_ip_range_pods
  ip_range_services          = var.cluster_ip_range_services
  network_project_id         = var.cluster_network_project_id
  region                     = var.default_region
  remove_default_node_pool   = true
  enable_private_nodes       = true
  enable_private_endpoint    = true
  master_ipv4_cidr_block     = "172.16.255.240/28"
  master_authorized_networks = [{ cidr_block = "172.16.255.240/28", display_name = "placeholder to not have a public IP" }]
  service_account            = "gke-${var.cluster_name}@${var.project_id}.iam.gserviceaccount.com"
}

Terraform Version

Terraform v1.4.0

Additional information

Service account name defined here is not using the correct name : https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/blob/master/sa.tf#L42