Add iwd standalone option to network configuration

Adds NicType.IWD as a third option alongside NM and NM_IWD: install
iwd, write /etc/iwd/main.conf with EnableNetworkConfiguration=true and
NameResolvingService=systemd, enable iwd.service + systemd-resolved.service.
iwd handles DHCP itself and resolved picks up its DNS via the symlink, so
no NetworkManager pulled in.

Also fills in parse_arg cases for NM_IWD and IWD so config files
round-trip both nic types.

Assisted-By: Flint

archinstall/lib/models/network.py

@@ -11,6 +11,7 @@ class NicType(Enum):
 	ISO = 'iso'
 	NM = 'nm'
 	NM_IWD = 'nm_iwd'
+	IWD = 'iwd'
 	MANUAL = 'manual'
 
 	def display_msg(self) -> str:
@@ -21,6 +22,8 @@ class NicType(Enum):
 				return tr('Use Network Manager (default backend)')
 			case NicType.NM_IWD:
 				return tr('Use Network Manager (iwd backend)')
+			case NicType.IWD:
+				return tr('Use iwd standalone (no Network Manager)')
 			case NicType.MANUAL:
 				return tr('Manual configuration')
 
@@ -125,6 +128,10 @@ class NetworkConfiguration:
 				return cls(NicType.ISO)
 			case NicType.NM:
 				return cls(NicType.NM)
+			case NicType.NM_IWD:
+				return cls(NicType.NM_IWD)
+			case NicType.IWD:
+				return cls(NicType.IWD)
 			case NicType.MANUAL:
 				nics_arg = config.get('nics', [])
 				if nics_arg:

archinstall/lib/network/network_handler.py

@@ -32,6 +32,12 @@ def install_network_config(
 				_configure_nm_iwd(installation)
 				installation.disable_service('iwd.service')
 
+		case NicType.IWD:
+			installation.add_additional_packages(['iwd'])
+			_configure_iwd_standalone(installation)
+			installation.enable_service('iwd.service')
+			installation.enable_service('systemd-resolved.service')
+
 		case NicType.MANUAL:
 			for nic in network_config.nics:
 				installation.configure_nic(nic)
@@ -45,3 +51,12 @@ def _configure_nm_iwd(installation: Installer) -> None:
 
 	iwd_backend_conf = nm_conf_dir / 'wifi_backend.conf'
 	_ = iwd_backend_conf.write_text('[device]\nwifi.backend=iwd\n')
+
+
+def _configure_iwd_standalone(installation: Installer) -> None:
+	# Let iwd handle DHCP/DNS itself; resolved picks up its DNS via the symlink.
+	iwd_conf_dir = installation.target / 'etc/iwd'
+	iwd_conf_dir.mkdir(parents=True, exist_ok=True)
+
+	main_conf = iwd_conf_dir / 'main.conf'
+	_ = main_conf.write_text('[General]\nEnableNetworkConfiguration=true\n\n[Network]\nNameResolvingService=systemd\n')

archinstall/lib/network/network_menu.py

@@ -202,6 +202,8 @@ async def select_network(preset: NetworkConfiguration | None) -> NetworkConfigur
 					return NetworkConfiguration(NicType.NM)
 				case NicType.NM_IWD:
 					return NetworkConfiguration(NicType.NM_IWD)
+				case NicType.IWD:
+					return NetworkConfiguration(NicType.IWD)
 				case NicType.MANUAL:
 					preset_nics = preset.nics if preset else []
 					nics = await ManualNetworkConfig(tr('Configure interfaces'), preset_nics).show()