[PATCH v2 4/9] tests/acceptance/boot_linux: Expand SD card image to power of 2

[Philippe Mathieu-Daudé]

In few commits 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_expand() methods and resize the
images (expanding) of the tests using SD cards.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
Since v1: Addressed review comments
- truncate -> expand reword (Alistair Francis)
- expand after uncompress (Niek Linnenbank)
---
 tests/acceptance/boot_linux_console.py | 27 +++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/tests/acceptance/boot_linux_console.py 
b/tests/acceptance/boot_linux_console.py
index b7e8858c2d..8f2a6aa8a4 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()
+
+# expand file size to next power of 2
+def image_pow2ceil_expand(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 '
 
@@ -636,6 +648,7 @@ 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_expand(rootfs_path)
 
         self.vm.set_console()
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
@@ -673,7 +686,7 @@ def test_arm_orangepi_bionic(self):
         :avocado: tags=device:sd
         """
 
-        # This test download a 196MB compressed image and expand it to 932MB...
+        # This test download a 196MB compressed image and expand it to 1GB
         image_url = ('https://dl.armbian.com/orangepipc/archive/'
                      'Armbian_19.11.3_Orangepipc_bionic_current_5.3.9.7z')
         image_hash = '196a8ffb72b0123d92cea4a070894813d305c71e'
@@ -681,6 +694,7 @@ 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_expand(image_path)
 
         self.vm.set_console()
         self.vm.add_args('-drive', 'file=' + image_path + ',if=sd,format=raw',
@@ -714,7 +728,7 @@ def test_arm_orangepi_uboot_netbsd9(self):
         :avocado: tags=machine:orangepi-pc
         :avocado: tags=device:sd
         """
-        # This test download a 304MB compressed image and expand it to 1.3GB...
+        # This test download a 304MB compressed image and expand it to 2GB
         deb_url = ('http://snapshot.debian.org/archive/debian/'
                    '20200108T145233Z/pool/main/u/u-boot/'
                    'u-boot-sunxi_2020.01%2Bdfsg-1_armhf.deb')
@@ -731,8 +745,9 @@ 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_drive_args = 'if=sd,format=raw,snapshot=on,file=' + image_path
         archive.gzip_uncompress(image_path_gz, image_path)
+        image_pow2ceil_expand(image_path)
+        image_drive_args = 'if=sd,format=raw,snapshot=on,file=' + image_path
 
         # dd if=u-boot-sunxi-with-spl.bin of=armv7.img bs=1K seek=8 
conv=notrunc
         with open(uboot_path, 'rb') as f_in:
@@ -740,12 +755,6 @@ def test_arm_orangepi_uboot_netbsd9(self):
                 f_out.seek(8 * 1024)
                 shutil.copyfileobj(f_in, f_out)
 
-                # Extend image, to avoid that NetBSD thinks the partition
-                # inside the image is larger than device size itself
-                f_out.seek(0, 2)
-                f_out.seek(64 * 1024 * 1024, 1)
-                f_out.write(bytearray([0x00]))
-
         self.vm.set_console()
         self.vm.add_args('-nic', 'user',
                          '-drive', image_drive_args,
-- 
2.21.3