Fix `mountpoint` for pre-mounted disk configuration (#2113)

* Fix `mountpoint` for pre-mounted disk configuration

* Add missing commas

5 files changed, 12 insertions, 22 deletions

diff --git a/archinstall/lib/disk/device_handler.py b/archinstall/lib/disk/device_handler.py
index 9646103f..4cb35c03 100644
--- a/archinstall/lib/disk/device_handler.py
+++ b/archinstall/lib/disk/device_handler.py
@@ -594,7 +594,9 @@ class DeviceHandler(object):
 					if is_subpath(mountpoint, base_mountpoint):
 						path = Path(part_info.disk.device.path)
 						part_mods.setdefault(path, [])
-						part_mods[path].append(PartitionModification.from_existing_partition(part_info))
+						part_mod = PartitionModification.from_existing_partition(part_info)
+						part_mod.mountpoint = mountpoint.root / mountpoint.relative_to(base_mountpoint)
+						part_mods[path].append(part_mod)
 						break
 
 		device_mods: List[DeviceModification] = []
diff --git a/archinstall/lib/disk/device_model.py b/archinstall/lib/disk/device_model.py
index 08861a63..b1f012f7 100644
--- a/archinstall/lib/disk/device_model.py
+++ b/archinstall/lib/disk/device_model.py
@@ -42,12 +42,6 @@ class DiskLayoutType(Enum):
 class DiskLayoutConfiguration:
 	config_type: DiskLayoutType
 	device_modifications: List[DeviceModification] = field(default_factory=list)
-	# used for pre-mounted config
-	relative_mountpoint: Optional[Path] = None
-
-	def __post_init__(self):
-		if self.config_type == DiskLayoutType.Pre_mount and self.relative_mountpoint is None:
-			raise ValueError('Must set a relative mountpoint when layout type is pre-mount"')
 
 	def json(self) -> Dict[str, Any]:
 		return {
@@ -487,10 +481,8 @@ class SubvolumeModification:
 
 		raise ValueError('Mountpoint is not specified')
 
-	def is_root(self, relative_mountpoint: Optional[Path] = None) -> bool:
+	def is_root(self) -> bool:
 		if self.mountpoint:
-			if relative_mountpoint is not None:
-				return self.mountpoint.relative_to(relative_mountpoint) == Path('.')
 			return self.mountpoint == Path('/')
 		return False
 
@@ -742,14 +734,12 @@ class PartitionModification:
 		"""
 		return any(set(self.flags) & set(self._boot_indicator_flags))
 
-	def is_root(self, relative_mountpoint: Optional[Path] = None) -> bool:
-		if relative_mountpoint is not None and self.mountpoint is not None:
-			return self.mountpoint.relative_to(relative_mountpoint) == Path('.')
-		elif self.mountpoint is not None:
+	def is_root(self) -> bool:
+		if self.mountpoint is not None:
 			return Path('/') == self.mountpoint
 		else:
 			for subvol in self.btrfs_subvols:
-				if subvol.is_root(relative_mountpoint):
+				if subvol.is_root():
 					return True
 
 		return False
@@ -861,8 +851,8 @@ class DeviceModification:
 			filtered = filter(lambda x: x.is_boot() and x.mountpoint, self.partitions)
 			return next(filtered, None)
 
-	def get_root_partition(self, relative_path: Optional[Path]) -> Optional[PartitionModification]:
-		filtered = filter(lambda x: x.is_root(relative_path), self.partitions)
+	def get_root_partition(self) -> Optional[PartitionModification]:
+		filtered = filter(lambda x: x.is_root(), self.partitions)
 		return next(filtered, None)
 
 	def json(self) -> Dict[str, Any]:
diff --git a/archinstall/lib/installer.py b/archinstall/lib/installer.py
index 8a0acf64..f8f59cc0 100644
--- a/archinstall/lib/installer.py
+++ b/archinstall/lib/installer.py
@@ -716,7 +716,7 @@ class Installer:
 
 	def _get_root_partition(self) -> Optional[disk.PartitionModification]:
 		for mod in self._disk_config.device_modifications:
-			if root := mod.get_root_partition(self._disk_config.relative_mountpoint):
+			if root := mod.get_root_partition():
 				return root
 		return None
 
@@ -903,8 +903,8 @@ class Installer:
 
 			add_options = [
 				'--target=x86_64-efi',
-				f'--efi-directory={efi_partition.mountpoint}'
-				f'--boot-directory={boot_partition.mountpoint if boot_partition else "/boot"}'
+				f'--efi-directory={efi_partition.mountpoint}',
+				f'--boot-directory={boot_partition.mountpoint if boot_partition else "/boot"}',
 				'--bootloader-id=GRUB',
 				'--removable'
 			]
diff --git a/archinstall/lib/interactions/disk_conf.py b/archinstall/lib/interactions/disk_conf.py
index 8542ab75..253a623d 100644
--- a/archinstall/lib/interactions/disk_conf.py
+++ b/archinstall/lib/interactions/disk_conf.py
@@ -139,7 +139,6 @@ def select_disk_config(
 
 				return disk.DiskLayoutConfiguration(
 					config_type=disk.DiskLayoutType.Pre_mount,
-					relative_mountpoint=path,
 					device_modifications=mods
 				)
 
diff --git a/examples/auto_discovery_mounted.py b/examples/auto_discovery_mounted.py
index 0bd30cd1..e3cb80b7 100644
--- a/examples/auto_discovery_mounted.py
+++ b/examples/auto_discovery_mounted.py
@@ -9,5 +9,4 @@ mods = disk.device_handler.detect_pre_mounted_mods(root_mount_dir)
 disk_config = disk.DiskLayoutConfiguration(
 	disk.DiskLayoutType.Pre_mount,
 	device_modifications=mods,
-	relative_mountpoint=Path('/mnt/archinstall')
 )