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add logic to automatically detect firmware irrespective of the Linux distribution

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This commit is contained in:
Lukas Greve
2025-10-20 11:28:28 +02:00
parent 7317e390c9
commit 8271e05336
2 changed files with 74 additions and 12 deletions
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76
shared_modules/variables.tf
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@@ -105,23 +105,25 @@ variable "dns_local_only" {
default = false
}
# Improved UEFI variables with automatic detection
variable "uefi_firmware" {
description = <<EOT
Path to the UEFI firmware binary (OVMF_CODE.fd, QEMU_CODE.fd, …).
Leave empty (or omit on the module call) to create a plain BIOS VM.
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 = "" # “BIOS only” when empty
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.
Leave empty for a plain BIOS VM or if you don't need UEFI NVRAM.
EOT
type = string
default = "" # no NVRAM when empty
default = ""
}
variable "uefi_nvram_file_suffix" {
@@ -135,7 +137,71 @@ variable "uefi_nvram_file_suffix" {
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"
]
# Helper function to find first existing file
find_first_existing = {
for path in local.uefi_firmware_paths :
path => true if fileexists(path)
}
# Function to get first available firmware path or null
detected_firmware = (
var.uefi_firmware == "true" || var.uefi_firmware == "" ? (
length(local.find_first_existing) > 0 ?
keys(local.find_first_existing)[0] :
null
) : (
var.uefi_firmware != "" ? var.uefi_firmware : null
)
)
# Same for NV-RAM template
find_first_nvram = {
for path in local.uefi_nvram_paths :
path => true if fileexists(path)
}
detected_nvram = (
var.uefi_firmware == "true" || var.uefi_firmware == "" ? (
length(local.find_first_nvram) > 0 ?
keys(local.find_first_nvram)[0] :
null
) : (
var.uefi_nvram_template != "" ? var.uefi_nvram_template : null
)
)
# Validate that both firmware and NVRAM are provided together if one is specified
firmware_and_nvram_valid = (
(local.detected_firmware != null && local.detected_nvram == null) ||
(local.detected_firmware == null && local.detected_nvram == null) ||
(local.detected_firmware != null && local.detected_nvram != null)
)
}