From 37a1af7a74e57e42ff6beefb8a7fdcae01a00ff7 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Mon, 21 Jun 2021 22:25:44 +0200 Subject: [PATCH] support/testing/infra: add img_round_power2() function Since Qemu 5.1, SD card images must have a size that are a power of two. While some filesystem (such as ext2/3/4) allow to specify the expected size of the filesystem, others such as SquashFS do not have this capability. We were already extending the size of such images to the next 1 MB boundary using "truncate -s %1M", but that is no longer sufficient. So instead, we introduce a helper function that extends the size of an image to the next power of two. Signed-off-by: Thomas Petazzoni [yann.morin.1998@free.fr: - use f.trunctate() rather than subprocess.call([truncate,...]) ] Signed-off-by: Yann E. MORIN --- support/testing/infra/__init__.py | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/support/testing/infra/__init__.py b/support/testing/infra/__init__.py index 6522a265f3..b10a7601a3 100644 --- a/support/testing/infra/__init__.py +++ b/support/testing/infra/__init__.py @@ -112,3 +112,15 @@ def get_elf_prog_interpreter(builddir, prefix, fpath): continue return m.group(1) return None + + +def img_round_power2(img): + """ + Rounds up the size of an image file to the next power of 2 + """ + sz = os.stat(img).st_size + pow2 = 1 + while pow2 < sz: + pow2 = pow2 << 1 + with open(img, 'ab') as f: + f.truncate(pow2) -- 2.30.2