disk layout: allow to omit partition "start" option to start from previous partition end (#895)

* disk layout: allow to omit partition "start" option to start from previous partition end

* mixed tabs/spaces fixes

* Update filesystem.py

Co-authored-by: Anton Hvornum <anton.feeds+github@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/archinstall/lib/disk/partition.py b/archinstall/lib/disk/partition.py
index afd34f20..7bfde64c 100644
--- a/archinstall/lib/disk/partition.py
+++ b/archinstall/lib/disk/partition.py
@@ -114,6 +114,7 @@ class Partition:
 
 	@property
 	def end(self) -> Optional[str]:
+		# TODO: actually this is size in sectors unit
 		# TODO: Verify that the logic holds up, that 'size' is the size without 'start' added to it.
 		output = json.loads(SysCommand(f"sfdisk --json {self.block_device.path}").decode('UTF-8'))
 
@@ -122,6 +123,14 @@ class Partition:
 				return partition['size']  # * self.sector_size
 
 	@property
+	def end_sectors(self) -> Optional[str]:
+		output = json.loads(SysCommand(f"sfdisk --json {self.block_device.path}").decode('UTF-8'))
+
+		for partition in output.get('partitiontable', {}).get('partitions', []):
+			if partition['node'] == self.path:
+				return partition['start'] + partition['size']
+
+	@property
 	def size(self) -> Optional[float]:
 		for i in range(storage['DISK_RETRY_ATTEMPTS']):
 			self.partprobe()