[PATCH 1/1] test: use truncate in mk_fs()

[Heinrich Schuchardt]

While the dd command actually writes to the block device the truncate
command only updates the metadata (at least on ext4). This is faster and
reduces wear on the block device.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
Gitlab CI showed no issues:
https://source.denx.de/u-boot/custodians/u-boot-efi/-/pipelines/25013
---
 test/py/tests/fs_helper.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/py/tests/fs_helper.py b/test/py/tests/fs_helper.py
index ccfc0201a49..d85e2b98a24 100644
--- a/test/py/tests/fs_helper.py
+++ b/test/py/tests/fs_helper.py
@@ -54,7 +54,7 @@ def mk_fs(config, fs_type, size, prefix, src_dir=None, size_gran = 0x100000):
 
     try:
         check_call(f'rm -f {fs_img}', shell=True)
-        check_call(f'dd if=/dev/zero of={fs_img} bs={size_gran} count={count}',
+        check_call(f'truncate -s $(( {size_gran} * {count} )) {fs_img}',
                    shell=True)
         check_call(f'mkfs.{fs_lnxtype} {mkfs_opt} {fs_img}', shell=True)
         if fs_type == 'ext4':
-- 
2.48.1