Sample terraform code I

main.tf

locals {
  tags = merge(var.tags, { "workspace" = "${terraform.workspace}" }) # add terraform workspace tag to any additional tags given as input
}

resource "azurerm_resource_group" "rg" {
  count    = var.create_resource_group ? 1 : 0 # conditional creation
  name     = "${terraform.workspace}-${var.resource_group_name}"
  location = var.resource_group_location

  tags = local.tags
}

variable "tags" {
  description = "tags to apply to the resources"
  default     = {}
}

variable "create_resource_group" {
  description = "Option to create a Azure resource group to use for VNET"
  type        = bool
  default     = true
}

variable "resource_group_name" {
  description = "The name of the resource group to use for the VNET, it is used in both cases even if the resource group is created"
  type        = string
  default     = "myRG"
}

variable "resource_group_location" {
  description = "Location for resource group See. https://azure.microsoft.com/en-us/global-infrastructure/locations/"
  type        = string
  default     = "West Europe"
}