[PATCH 1/2] tests/acceptance/boot_linux: Truncate SD card image to power of 2

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

In the next commit we won't allow SD card images with invalid
size (not aligned to a power of 2). Prepare the tests: add the
pow2ceil() and image_pow2ceil_truncate() methods and truncate
the images of the tests using SD cards.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 tests/acceptance/boot_linux_console.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tests/acceptance/boot_linux_console.py b/tests/acceptance/boot_linux_console.py
index 3d02519660..f4d4e3635f 100644
--- a/tests/acceptance/boot_linux_console.py
+++ b/tests/acceptance/boot_linux_console.py
@@ -28,6 +28,18 @@
 except CmdNotFoundError:
     P7ZIP_AVAILABLE = False
 
+# round up to next power of 2
+def pow2ceil(x):
+    return 1 if x == 0 else 2**(x - 1).bit_length()
+
+# truncate file size to next power of 2
+def image_pow2ceil_truncate(path):
+        size = os.path.getsize(path)
+        size_aligned = pow2ceil(size)
+        if size != size_aligned:
+            with open(path, 'ab+') as fd:
+                fd.truncate(size_aligned)
+
 class LinuxKernelTest(Test):
     KERNEL_COMMON_COMMAND_LINE = 'printk.time=0 '
 
@@ -635,6 +647,7 @@ def test_arm_orangepi_sd(self):
         rootfs_path_xz = self.fetch_asset(rootfs_url, asset_hash=rootfs_hash)
         rootfs_path = os.path.join(self.workdir, 'rootfs.cpio')
         archive.lzma_uncompress(rootfs_path_xz, rootfs_path)
+        image_pow2ceil_truncate(rootfs_path)
 
         self.vm.set_console()
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
@@ -679,6 +692,7 @@ def test_arm_orangepi_bionic(self):
         image_name = 'Armbian_19.11.3_Orangepipc_bionic_current_5.3.9.img'
         image_path = os.path.join(self.workdir, image_name)
         process.run("7z e -o%s %s" % (self.workdir, image_path_7z))
+        image_pow2ceil_truncate(image_path)
 
         self.vm.set_console()
         self.vm.add_args('-drive', 'file=' + image_path + ',if=sd,format=raw',
@@ -728,6 +742,7 @@ def test_arm_orangepi_uboot_netbsd9(self):
         image_hash = '2babb29d36d8360adcb39c09e31060945259917a'
         image_path_gz = self.fetch_asset(image_url, asset_hash=image_hash)
         image_path = os.path.join(self.workdir, 'armv7.img')
+        image_pow2ceil_truncate(image_path)
         image_drive_args = 'if=sd,format=raw,snapshot=on,file=' + image_path
         archive.gzip_uncompress(image_path_gz, image_path)
 
-- 
2.21.3