refactor(talos): make talos_machine_config_version an optional parameter

tofu/kubernetes/main.tf

@@ -19,22 +19,21 @@ module "talos" {
   }
 
   cluster = {
-    name            = "talos"
+    name                         = "talos"
     # This should point to the vip as below(if nodes on layer 2) or one of the nodes (if nodes not on layer 2)
     # Note: Nodes are not on layer 2 if there is a router between them (even a mesh router)
     #       Not sure how it works if connected to the same router via ethernet (does it act as a switch then???)
     # Ref: https://www.talos.dev/v1.9/talos-guides/network/vip/#requirements
     # Note This is Kubernetes API endpoint. Different from all mentions of Talos endpoints.
-    endpoint = "192.168.1.102"
-    # Omit this if devices are not connected on layer 2
-    vip             = "192.168.1.99"
-    gateway         = "192.168.1.1"
+    endpoint                     = "192.168.1.102"
+    vip                          = "192.168.1.99"
+    gateway                      = "192.168.1.1"
     # The version of talos features to use in generated machine configuration. Generally the same as image version.
     # See https://github.com/siderolabs/terraform-provider-talos/blob/main/docs/data-sources/machine_configuration.md
-    talos_machine_config_version   = "v1.9.2"
-    proxmox_cluster = "homelab"
+    talos_machine_config_version = "v1.9.2"
+    proxmox_cluster              = "homelab"
     kubernetes_version = "1.32.0"  # renovate: github-releases=kubernetes/kubernetes
-    base_domain     = "stonegarden.dev"
+    base_domain                  = "stonegarden.dev"
   }
 
   nodes = {

tofu/kubernetes/talos/config.tf

@@ -12,14 +12,16 @@ data "talos_client_configuration" "this" {
 }
 
 data "talos_machine_configuration" "this" {
-  for_each         = var.nodes
-  cluster_name     = var.cluster.name
+  for_each        = var.nodes
+  cluster_name    = var.cluster.name
   # This is the Kubernetes API Server endpoint.
   # ref - https://www.talos.dev/v1.9/introduction/prodnotes/#decide-the-kubernetes-endpoint
   cluster_endpoint = "https://${var.cluster.endpoint}:6443"
-  talos_version    = var.cluster.talos_machine_config_version
-  machine_type     = each.value.machine_type
-  machine_secrets  = talos_machine_secrets.this.machine_secrets
+  # @formatter:off
+  talos_version = var.cluster.talos_machine_config_version != null ? var.cluster.talos_machine_config_version : (each.value.update == true ? var.image.update_version : var.image.version)
+  # @formatter:on
+  machine_type    = each.value.machine_type
+  machine_secrets = talos_machine_secrets.this.machine_secrets
   config_patches = [
     templatefile("${path.module}/machine-config/common.yaml.tftpl", {
       node_name    = each.value.host_node

tofu/kubernetes/talos/variables.tf

@@ -20,7 +20,7 @@ variable "cluster" {
     vip = optional(string)
     gateway                      = string
     subnet_mask = optional(string, "24")
-    talos_machine_config_version = string
+    talos_machine_config_version = optional(string)
     proxmox_cluster              = string
     kubernetes_version           = string
     base_domain                  = string