lib/network: adds symlink to configure systemd-resovled properly (#4052)

* lib/network: adds symlink to configure systemd-resovled properly

* lib/network: adds overwrite mechanism to enforce resolved symlink

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Co-authored-by: Vincent Dahmen <wahrwolf@wolfpit.net>

Author: wahrwolf

archinstall/lib/installer.py

@@ -755,6 +755,13 @@ def post_install_enable_iwd_service(*args: str, **kwargs: str) -> None:
 				for psk in psk_files:
 					shutil.copy2(psk, f'{self.target}/var/lib/iwd/{os.path.basename(psk)}')
 
+		# Enable systemd-resolved by (forcefully) setting a symlink
+		# For further details see  https://wiki.archlinux.org/title/Systemd-resolved#DNS
+		resolv_config_path = Path(f'{self.target}/etc/resolv.conf')
+		if resolv_config_path.exists():
+			os.unlink(resolv_config_path)
+		os.symlink('/run/systemd/resolve/stub-resolv.conf', resolv_config_path)
+
 		# Copy (if any) systemd-networkd config files
 		if netconfigurations := glob.glob('/etc/systemd/network/*'):
 			if not os.path.isdir(f'{self.target}/etc/systemd/network/'):