Add efi_format options to efi_config

Using this option is possibile to create qcow2 EFI disks,
instead of the default raw backend.

.web-docs/components/builder/clone/README.md

@@ -772,6 +772,7 @@ Usage example (JSON):
 	{
 	  "efi_storage_pool": "local",
 	  "pre_enrolled_keys": true,
+	  "efi_format": "raw",
 	  "efi_type": "4m"
 	}
 
@@ -786,6 +787,10 @@ Usage example (JSON):
 
 - `efi_storage_pool` (string) - Name of the Proxmox storage pool to store the EFI disk on.
 
+- `efi_format` (string) - The format of the file backing the disk. Can be
+  `raw`, `cow`, `qcow`, `qed`, `qcow2`, `vmdk` or `cloop`. Defaults to
+  `raw`.
+
 - `pre_enrolled_keys` (bool) - Whether Microsoft Standard Secure Boot keys should be pre-loaded on
   the EFI disk. Defaults to `false`.
 

.web-docs/components/builder/iso/README.md

@@ -686,6 +686,7 @@ Usage example (JSON):
 	{
 	  "efi_storage_pool": "local",
 	  "pre_enrolled_keys": true,
+	  "efi_format": "raw",
 	  "efi_type": "4m"
 	}
 
@@ -700,6 +701,10 @@ Usage example (JSON):
 
 - `efi_storage_pool` (string) - Name of the Proxmox storage pool to store the EFI disk on.
 
+- `efi_format` (string) - The format of the file backing the disk. Can be
+  `raw`, `cow`, `qcow`, `qed`, `qcow2`, `vmdk` or `cloop`. Defaults to
+  `raw`.
+
 - `pre_enrolled_keys` (bool) - Whether Microsoft Standard Secure Boot keys should be pre-loaded on
   the EFI disk. Defaults to `false`.
 

builder/proxmox/common/config.go

@@ -361,13 +361,18 @@ type diskConfig struct {
 //	{
 //	  "efi_storage_pool": "local",
 //	  "pre_enrolled_keys": true,
+//	  "efi_format": "raw",
 //	  "efi_type": "4m"
 //	}
 //
 // ```
 type efiConfig struct {
 	// Name of the Proxmox storage pool to store the EFI disk on.
 	EFIStoragePool string `mapstructure:"efi_storage_pool"`
+	// The format of the file backing the disk. Can be
+	// `raw`, `cow`, `qcow`, `qed`, `qcow2`, `vmdk` or `cloop`. Defaults to
+	// `raw`.
+	EFIFormat string `mapstructure:"efi_format"`
 	// Whether Microsoft Standard Secure Boot keys should be pre-loaded on
 	// the EFI disk. Defaults to `false`.
 	PreEnrolledKeys bool `mapstructure:"pre_enrolled_keys"`

builder/proxmox/common/step_start_vm.go

@@ -460,6 +460,7 @@ func generateProxmoxEfi(efi efiConfig) proxmox.QemuDevice {
 	dev := make(proxmox.QemuDevice)
 	setDeviceParamIfDefined(dev, "storage", efi.EFIStoragePool)
 	setDeviceParamIfDefined(dev, "efitype", efi.EFIType)
+	setDeviceParamIfDefined(dev, "format", efi.EFIFormat)
 	// efi.PreEnrolledKeys can be false, but we only want to set pre-enrolled-keys=0
 	// when other EFI options are set.
 	if len(dev) > 0 {

docs-partials/builder/proxmox/common/efiConfig-not-required.mdx

@@ -2,6 +2,10 @@
 
 - `efi_storage_pool` (string) - Name of the Proxmox storage pool to store the EFI disk on.
 
+- `efi_format` (string) - The format of the file backing the disk. Can be
+  `raw`, `cow`, `qcow`, `qed`, `qcow2`, `vmdk` or `cloop`. Defaults to
+  `raw`.
+
 - `pre_enrolled_keys` (bool) - Whether Microsoft Standard Secure Boot keys should be pre-loaded on
   the EFI disk. Defaults to `false`.
 

docs-partials/builder/proxmox/common/efiConfig.mdx

@@ -10,6 +10,7 @@ Usage example (JSON):
 	{
 	  "efi_storage_pool": "local",
 	  "pre_enrolled_keys": true,
+	  "efi_format": "raw",
 	  "efi_type": "4m"
 	}