chore: Update Terraform module to follow CC006 (#64)

terraform/README.md

@@ -17,7 +17,7 @@ rather serve as a building block for higher level modules.
 - **output.tf** - Responsible for integrating the module with other Terraform modules, primarily
   by defining potential integration endpoints (charm integrations), but also by exposing
   the application name.
-- **terraform.tf** - Defines the Terraform provider.
+- **versions.tf** - Defines the Terraform provider.
 
 ## Using oai-ran-cu-k8s base module in higher level modules
 
@@ -28,7 +28,7 @@ like shown below:
 module "cu" {
   source = "git::https://github.com/canonical/oai-ran-cu-k8s-operator//terraform"
   
-  model_name = "juju_model_name"
+  model = "juju_model_name"
   config = Optional config map
 }
 ```
@@ -37,14 +37,14 @@ Create integrations, for instance:
 
 ```text
 resource "juju_integration" "cu-amf" {
-  model = var.model_name
+  model = var.model
   application {
     name     = module.cu.app_name
-    endpoint = module.cu.fiveg_n2_endpoint
+    endpoint = module.cu.requires.fiveg_n2
   }
   application {
     name     = module.amf.app_name
-    endpoint = module.amf.fiveg_n2_endpoint
+    endpoint = module.amf.provides.fiveg_n2
   }
 }
 ```

terraform/main.tf

@@ -1,15 +1,19 @@
-# Copyright 2024 Canonical Ltd.
+# Copyright 2025 Canonical Ltd.
 # See LICENSE file for licensing details.
 
 resource "juju_application" "cu" {
   name  = var.app_name
-  model = var.model_name
+  model = var.model
 
   charm {
-    name    = "oai-ran-cu-k8s"
-    channel = var.channel
+    name     = "oai-ran-cu-k8s"
+    channel  = var.channel
+    revision = var.revision
   }
-  config = var.config
-  units  = 1
-  trust  = true
+
+  config      = var.config
+  constraints = var.constraints
+  units       = var.units
+  resources   = var.resources
+  trust       = true
 }

terraform/outputs.tf

@@ -1,31 +1,21 @@
-# Copyright 2024 Canonical Ltd.
+# Copyright 2025 Canonical Ltd.
 # See LICENSE file for licensing details.
 
 output "app_name" {
   description = "Name of the deployed application."
   value       = juju_application.cu.name
 }
 
-# Required integration endpoints
-
-output "fiveg_n2_endpoint" {
-  description = "Name of the endpoint used to provide information on connectivity to the N2 plane."
-  value       = "fiveg_n2"
-}
-
-output "fiveg_core_gnb_endpoint" {
-  description = "Name of the endpoint used to provide core network configuration to gNB."
-  value       = "fiveg_core_gnb"
+output "provides" {
+  value = {
+    "fiveg_f1" = "fiveg_f1"
+  }
 }
 
-output "logging_endpoint" {
-  description = "Name of the endpoint used to integrate with the Logging provider."
-  value       = "logging"
-}
-
-# Provided integration endpoints
-
-output "fiveg_f1_endpoint" {
-  description = "Name of the endpoint used to provide information about F1 interface."
-  value       = "fiveg_f1"
+output "requires" {
+  value = {
+    "fiveg_n2"       = "fiveg_n2"
+    "fiveg_core_gnb" = "fiveg_core_gnb"
+    "logging"        = "logging"
+  }
 }

terraform/variables.tf

@@ -1,12 +1,6 @@
-# Copyright 2024 Canonical Ltd.
+# Copyright 2025 Canonical Ltd.
 # See LICENSE file for licensing details.
 
-variable "model_name" {
-  description = "Name of Juju model to deploy application to."
-  type        = string
-  default     = ""
-}
-
 variable "app_name" {
   description = "Name of the application in the Juju model."
   type        = string
@@ -24,3 +18,38 @@ variable "config" {
   type        = map(string)
   default     = {}
 }
+
+variable "constraints" {
+  description = "Juju constraints to apply for this application."
+  type        = string
+  default     = "arch=amd64"
+}
+
+variable "model" {
+  type        = string
+  description = "Reference to a `juju_model`."
+  default     = ""
+}
+
+variable "resources" {
+  description = "Resources to use with the application. Details about available options can be found at https://charmhub.io/oai-ran-cu-k8s/configure."
+  type        = map(string)
+  default     = {}
+}
+
+variable "revision" {
+  description = "Revision number of the charm"
+  type        = number
+  default     = null
+}
+
+variable "units" {
+  description = "Number of units to deploy"
+  type        = number
+  default     = 1
+
+  validation {
+    condition     = var.units == 1
+    error_message = "Scaling is not supported for this charm."
+  }
+}

tox.ini

@@ -14,6 +14,8 @@ lib_path = {toxinidir}/lib/charms/oai_ran_cu_k8s/v0
 all_path = {[vars]src_path} {[vars]unit_test_path} {[vars]integration_test_path} {[vars]lib_path}
 
 [testenv]
+runner = uv-venv-lock-runner
+with_dev = true
 setenv =
     PYTHONPATH = {toxinidir}:{toxinidir}/lib:{[vars]src_path}
     PYTHONBREAKPOINT=pdb.set_trace