Add IWD standalone option to network configuration + fix NM_IWD (#4528)

* 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

* wire up resolv stub and networkd service

* exclude virtual devices, dont harcode iface name instead match 'ether'
similar pattern to .network files shipped in /etc/systemd/network

* use dedent and rename menu option

archinstall/lib/models/network.py

@@ -12,6 +12,7 @@ class NicType(Enum):
 	ISO = 'iso'
 	NM = 'nm'
 	NM_IWD = 'nm_iwd'
+	IWD = 'iwd'
 	MANUAL = 'manual'
 
 	def display_msg(self) -> str:
@@ -22,6 +23,8 @@ 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 standalone iwd')
 			case NicType.MANUAL:
 				return tr('Manual configuration')
 
@@ -131,6 +134,10 @@ class NetworkConfiguration(SubConfig):
 				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

@@ -1,3 +1,5 @@
+import textwrap
+
 from archinstall.lib.installer import Installer
 from archinstall.lib.models.network import NetworkConfiguration, NicType
 from archinstall.lib.models.profile import ProfileConfiguration
@@ -32,6 +34,13 @@ 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-networkd.service')
+			installation.enable_service('systemd-resolved.service')
+
 		case NicType.MANUAL:
 			for nic in network_config.nics:
 				installation.configure_nic(nic)
@@ -45,3 +54,36 @@ 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:
+	# iwd manages wireless only; systemd-networkd handles wired DHCP.
+	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_content = textwrap.dedent("""\
+		[General]
+		EnableNetworkConfiguration=true
+
+		[Network]
+		NameResolvingService=systemd
+	""")
+	_ = main_conf.write_text(main_conf_content)
+
+	networkd_dir = installation.target / 'etc/systemd/network'
+	networkd_dir.mkdir(parents=True, exist_ok=True)
+	wired_conf = networkd_dir / '20-wired.network'
+	wired_conf_content = textwrap.dedent("""\
+		[Match]
+		Type=ether
+		Kind=!*
+
+		[Network]
+		DHCP=yes
+	""")
+	_ = wired_conf.write_text(wired_conf_content)
+
+	resolv = installation.target / 'etc/resolv.conf'
+	resolv.unlink(missing_ok=True)
+	resolv.symlink_to('/run/systemd/resolve/stub-resolv.conf')

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()