[OE-core] [PATCH] wic/utils/partitionedfs.py: assemble .wic images as sparse files

[Joshua Lock]

The individual partitions created by wic are sparse but without
this change the assembled image is written as one (potentially
very) large file.

Preserve sparseness in the assembled image by passing the sparse
conversion symbol.

Signed-off-by: Joshua Lock <joshua.lock at collabora.co.uk>
---
 scripts/lib/wic/utils/partitionedfs.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/lib/wic/utils/partitionedfs.py b/scripts/lib/wic/utils/partitionedfs.py
index 5a103bb..3e2b420 100644
--- a/scripts/lib/wic/utils/partitionedfs.py
+++ b/scripts/lib/wic/utils/partitionedfs.py
@@ -340,7 +340,7 @@ class Image(object):
             source = part['source_file']
             if source:
                 # install source_file contents into a partition
-                cmd = "dd if=%s of=%s bs=%d seek=%d count=%d conv=notrunc" % \
+                cmd = "dd if=%s of=%s bs=%d seek=%d count=%d conv=notrunc,sparse" % \
                       (source, image_file, self.sector_size,
                        part['start'], part['size'])
                 exec_cmd(cmd)
-- 
2.5.0