advanced-libvirt-terraform-examples/shared_modules/variables.tf

variable "libvirt_uri" {
  description = "URI for libvirt connection"
  type        = string
  default     = "qemu:///system"
}

variable "pool_name" {
  description = "Name of the storage pool"
  type        = string
  default     = "tf_tmp_pool"
}

variable "pool_path" {
  description = "Path for the storage pool"
  type        = string
  default     = "/opt/tf_tmp_storage"
}

variable "instance_count" {
  description = "Number of instances to create"
  type        = number
  default     = 1
}

variable "vm_name" {
  description = "Name prefix for VMs"
  type        = string
}

variable "image_location" {
  description = "Location of the OS image"
  type        = string
  default     = "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
}
# To avoid refetching the cloud ISO each time, it could could be set to a local directory, like : "/var/lib/libvirt/images/noble-server-cloudimg-amd64.img"

variable "cloudinit_filename" {
  description = "Name of the cloud-init ISO file"
  type        = string
  default     = "commoninit.iso"
}

variable "enable_cloudinit" {
  description = "Enable cloud-init support"
  type        = bool
  default     = false
}

variable "ssh_key" {
  description = "SSH authorized keys for cloud-init"
  type        = string
  default = ""
}

variable "user_data" {
  description = "User data for cloud-init"
  type        = string
  default = ""
}

variable "memory" {
  description = "Memory allocation in MB"
  type        = number
  default     = 2048
  validation {
    condition     = var.memory >= 512
    error_message = "Memory must be at least 512MB."
  }
}

variable "vcpu" {
  description = "Number of virtual CPUs"
  type        = number
  default     = 1
}

variable "network_mode" {
  description = "Network mode (nat, none, route, open, bridge)"
  type        = string
  default     = "nat"
}

variable "network_domain" {
  description = "Domain name for the network (derived from vm_name)"
  type        = string
  # Default dynamically based on vm_name
  default = ""
}

variable "network_addresses" {
  description = "List of network addresses"
  type        = list(string)
  default     = ["10.17.3.0/24", "2001:db8:ca2:2::1/64"]
}

variable "dns_enabled" {
  description = "Enable DNS for the network"
  type        = bool
  default     = true
}

variable "dns_local_only" {
  description = "DNS requests only resolved by virtual network's DNS server"
  type        = bool
  default     = false
}

# Improved UEFI variables with automatic detection
# For backward compatibility with the current module interface
variable "uefi_firmware" {
  description = <<EOT
    Enable UEFI support. Set to true to enable UEFI with auto-detected firmware,
    or provide a specific path to the firmware binary.
    Set to false or omit to create a plain BIOS VM.
  EOT
  type        = string
  default     = ""
}

variable "uefi_nvram_template" {
  description = <<EOT
    Path to an NV‑RAM template that backs the UEFI NVRAM.
    If you specify a template, the VM will get a writable NVRAM block.
    Leave empty for a plain BIOS VM or if you don't need UEFI NVRAM.
  EOT
  type        = string
  default     = ""
}

variable "uefi_nvram_file_suffix" {
  description = <<EOT
    Optional file‑suffix fragment that is appended to the
    generated NVRAM file name.  Useful when you want to put the
    files under a dedicated directory (`/var/lib/libvirt/qemu/uefi/nvram/…`).
    Empty string means “no suffix” (default behaviour).
  EOT
  type        = string
  default     = ""
}

# Computed variable for network domain (derived from vm_name)
locals {
  computed_network_domain = var.network_domain != "" ? var.network_domain : "${var.vm_name}.local"
   
  # List of common UEFI firmware paths in order of preference  
  uefi_firmware_paths = [
    "/usr/share/edk2/ovmf/OVMF_CODE.4m.fd",
    "/usr/share/edk2/x64/OVMF_CODE.4m.fd",
    "/usr/share/OVMF/OVMF_CODE.4m.fd", 
    "/usr/share/ovmf/OVMF_CODE.4m.fd",
    "/usr/share/edk2/ovmf/OVMF_CODE.fd",
    "/usr/share/edk2/x64/OVMF_CODE.fd",
    "/usr/share/OVMF/OVMF_CODE.fd",
    "/usr/share/ovmf/OVMF_CODE.fd"
  ]
  
  uefi_nvram_paths = [
    "/usr/share/edk2/ovmf/OVMF_VARS.4m.fd",
    "/usr/share/edk2/x64/OVMF_VARS.4m.fd", 
    "/usr/share/OVMF/OVMF_VARS.4m.fd",
    "/usr/share/ovmf/OVMF_VARS.4m.fd",
    "/usr/share/edk2/ovmf/OVMF_VARS.fd",
    "/usr/share/edk2/x64/OVMF_VARS.fd",
    "/usr/share/OVMF/OVMF_VARS.fd",
    "/usr/share/ovmf/OVMF_VARS.fd"
  ]
  
  # Determine if UEFI should be enabled
  uefi_enabled = (
    var.uefi_firmware == "true" || 
    var.uefi_firmware == true ||
    (var.uefi_firmware != "" && var.uefi_firmware != false && var.uefi_firmware != null)
  )
  
  # Function to get first available firmware path or null
  detected_firmware = (
    local.uefi_enabled ? (
      length(local.uefi_firmware_paths) > 0 ? (
        length([for path in local.uefi_firmware_paths : path if fileexists(path)]) > 0 ? 
        [for path in local.uefi_firmware_paths : path if fileexists(path)][0] :
        null
      ) : null
    ) : null
  )
  
  # Function to get first available NVRAM template or null
  detected_nvram = (
    local.uefi_enabled ? (
      length(local.uefi_nvram_paths) > 0 ? (
        length([for path in local.uefi_nvram_paths : path if fileexists(path)]) > 0 ? 
        [for path in local.uefi_nvram_paths : path if fileexists(path)][0] :
        null
      ) : null
    ) : null
  )
}