In bundle_volume keep partition starting points

When shrinking partitions, make sure that the shrinked partitions
always starts from the sector the initial partition started. Changing
this may destroy the boot loader.

diff --git a/image_creator/bundle_volume.py b/image_creator/bundle_volume.py
index ff6ed3e..189e107 100644 (file)
--- a/image_creator/bundle_volume.py
+++ b/image_creator/bundle_volume.py
@@ -222,9 +222,13 @@ class BundleVolume(object):
             # Align to 2048
             part_end = ((part_end + 2047) // 2048) * 2048
 
+            # Make sure the partition starts where the old partition started.
+            constraint = parted.Constraint(device=image_disk.device)
+            constraint.startRange = parted.Geometry(device=image_disk.device,
+                                                    start=last.start, length=1)
+
             image_disk.setPartitionGeometry(
-                image_disk.getPartitionBySector(last.start),
-                parted.Constraint(device=image_disk.device),
+                image_disk.getPartitionBySector(last.start), constraint,
                 start=last.start, end=part_end)
             image_disk.commitToDevice()