wic: call os.ftruncate instead of running truncate

Replaced running of truncate utility with the standard library
call os.ftruncate

(From OE-Core rev: 1ba6101ceaee354816e690d44bc9a5dd8dcf4011)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/scripts/lib/wic/imager/direct.py b/scripts/lib/wic/imager/direct.py
index edf5e5d221..2bedef08d6 100644
--- a/scripts/lib/wic/imager/direct.py
+++ b/scripts/lib/wic/imager/direct.py
@@ -56,8 +56,9 @@ class DiskImage():
         if self.created:
             return
         # create sparse disk image
-        cmd = "truncate %s -s %s" % (self.device, self.size)
-        exec_cmd(cmd)
+        with open(self.device, 'w') as sparse:
+            os.ftruncate(sparse.fileno(), self.size)
+
         self.created = True
 
 class DirectImageCreator(BaseImageCreator):