Disable zswap (#883)

Disable zswap when using zram.

The swap device is now initialised before the bootloader, inline with the
installation guide.

archinstall/lib/installer.py

@@ -619,8 +619,11 @@ class Installer:
 			with open(f"{self.target}/etc/systemd/zram-generator.conf", "w") as zram_conf:
 				zram_conf.write("[zram0]\n")
 
-			if self.enable_service('systemd-zram-setup@zram0.service'):
-				return True
+			self.enable_service('systemd-zram-setup@zram0.service')
+
+			self.zram_enabled = True
+
+			return True
 		else:
 			raise ValueError(f"Archinstall currently only supports setting up swap on zram")
 
@@ -727,6 +730,12 @@ class Installer:
 					if bind_path is not None: # and root_fs_type == 'btrfs':
 						options_entry = f"rootflags=subvol={bind_path} " + options_entry
 
+					# Zswap should be disabled when using zram.
+					#
+					# https://github.com/archlinux/archinstall/issues/881
+					if self.zram_enabled:
+						options_entry = "zswap.enabled=0 " + options_entry
+
 					if real_device := self.detect_encryption(root_partition):
 						# TODO: We need to detect if the encrypted device is a whole disk encryption,
 						#       or simply a partition encryption. Right now we assume it's a partition (and we always have)

examples/guided.py

@@ -219,11 +219,11 @@ def perform_installation(mountpoint):
 			installation.set_hostname(archinstall.arguments['hostname'])
 			if archinstall.arguments['mirror-region'].get("mirrors", None) is not None:
 				installation.set_mirrors(archinstall.arguments['mirror-region'])  # Set the mirrors in the installation medium
+			if archinstall.arguments['swap']:
+				installation.setup_swap('zram')
 			if archinstall.arguments["bootloader"] == "grub-install" and archinstall.has_uefi():
 				installation.add_additional_packages("grub")
 			installation.add_bootloader(archinstall.arguments["bootloader"])
-			if archinstall.arguments['swap']:
-				installation.setup_swap('zram')
 
 			# If user selected to copy the current ISO network configuration
 			# Perform a copy of the config