* [Buildroot] [PATCH next 1/1] support/testing/tests/package/test_ddrescue.py: new runtime test
@ 2023-03-05 17:30 Julien Olivain
2023-03-12 22:11 ` Thomas Petazzoni via buildroot
0 siblings, 1 reply; 2+ messages in thread
From: Julien Olivain @ 2023-03-05 17:30 UTC (permalink / raw)
To: buildroot; +Cc: Julien Olivain
Signed-off-by: Julien Olivain <ju.o@free.fr>
---
Patch tested on branch next at commit b793f3a with commands:
python3 -m flake8 support/testing/tests/package/test_ddrescue.py
[no-output]
support/testing/run-tests \
-d dl -o output_folder \
tests.package.test_ddrescue
...
OK
---
DEVELOPERS | 2 +
.../testing/tests/package/test_ddrescue.py | 94 +++++++++++++++++++
.../test_ddrescue/linux-ddrescue.fragment | 4 +
3 files changed, 100 insertions(+)
create mode 100644 support/testing/tests/package/test_ddrescue.py
create mode 100644 support/testing/tests/package/test_ddrescue/linux-ddrescue.fragment
diff --git a/DEVELOPERS b/DEVELOPERS
index d052e59122..a6ed5c48cc 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -1715,6 +1715,8 @@ F: support/testing/tests/package/sample_python_distro.py
F: support/testing/tests/package/sample_python_gnupg.py
F: support/testing/tests/package/sample_python_pyalsa.py
F: support/testing/tests/package/sample_python_spake2.py
+F: support/testing/tests/package/test_ddrescue.py
+F: support/testing/tests/package/test_ddrescue/
F: support/testing/tests/package/test_gnupg2.py
F: support/testing/tests/package/test_highway.py
F: support/testing/tests/package/test_hwloc.py
diff --git a/support/testing/tests/package/test_ddrescue.py b/support/testing/tests/package/test_ddrescue.py
new file mode 100644
index 0000000000..2206971421
--- /dev/null
+++ b/support/testing/tests/package/test_ddrescue.py
@@ -0,0 +1,94 @@
+import os
+
+import infra.basetest
+
+
+class TestDdrescue(infra.basetest.BRTest):
+
+ # A specific configuration is needed for testing ddrescue:
+ # - A kernel config fragment enables loop blk dev and device
+ # mapper dm-dust, which are used to simulate a failing storage
+ # block device.
+ # - dmraid user space package is needed to configure dm-dust
+ config = \
+ """
+ BR2_aarch64=y
+ BR2_TOOLCHAIN_EXTERNAL=y
+ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+ BR2_LINUX_KERNEL=y
+ BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+ BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.1.15"
+ BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+ BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
+ BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{}"
+ BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+ BR2_PACKAGE_DDRESCUE=y
+ BR2_PACKAGE_DMRAID=y
+ BR2_TARGET_ROOTFS_CPIO=y
+ BR2_TARGET_ROOTFS_CPIO_GZIP=y
+ # BR2_TARGET_ROOTFS_TAR is not set
+ """.format(
+ infra.filepath("tests/package/test_ddrescue/linux-ddrescue.fragment")
+ )
+
+ def test_run(self):
+ img = os.path.join(self.builddir, "images", "rootfs.cpio.gz")
+ kern = os.path.join(self.builddir, "images", "Image")
+ self.emulator.boot(arch="aarch64",
+ kernel=kern,
+ kernel_cmdline=["console=ttyAMA0"],
+ options=["-M", "virt", "-cpu", "cortex-a57", "-m", "256M", "-initrd", img])
+ self.emulator.login()
+
+ # Test variables:
+ dev_img = "/tmp/dev.img"
+ lo_dev = "/dev/loop0"
+ dm_dev_name = "dust0"
+ dm_dev = f"/dev/mapper/{dm_dev_name}"
+ ddrescue_img = "/tmp/ddrescue.img"
+
+ # Test the program can execute
+ self.assertRunOk("ddrescue --version")
+
+ # Create a 1MB file of zeroes for initial loopback block device
+ self.assertRunOk(f"dd if=/dev/zero of={dev_img} bs=1M count=1")
+
+ # Setup lookback block device
+ self.assertRunOk(f"losetup {lo_dev} {dev_img}")
+
+ # Create and setup dm-dust to simulate a failing block device
+ # The dev_img file is 1MB: 2048 blocks of 512 bytes each
+ self.assertRunOk(f"dmsetup create {dm_dev_name} --table '0 2048 dust {lo_dev} 0 512'")
+
+ # Add few bad blocks and enable I/O error emulation
+ for badblock in [30, 40, 50, 60]:
+ self.assertRunOk(f"dmsetup message {dm_dev_name} 0 addbadblock {badblock}")
+ self.assertRunOk(f"dmsetup message {dm_dev_name} 0 enable")
+
+ # Show device mapper status, to make debugging easier
+ self.assertRunOk(f"dmsetup status {dm_dev_name}")
+
+ # A normal 'dd' is expected to fail with I/O error
+ cmd = f"dd if={dm_dev} of=/dev/null bs=512"
+ _, exit_code = self.emulator.run(cmd)
+ self.assertNotEqual(exit_code, 0)
+
+ # Where a normal 'dd' fails, 'ddrescue' is expected to succeed
+ self.assertRunOk(f"ddrescue {dm_dev} {ddrescue_img}")
+
+ # ddrescue does not normaly write any output data when there
+ # is I/O error on the input. The intent is to preserve any
+ # data that could have been read in a previous pass. There is
+ # one exception, when the output is a non-existing regular
+ # file, ddrescue will initialize it with zeroes the first
+ # time. Since the original image file was also including
+ # zeroes, the recovered image is expected to be the same as
+ # the original one. See ddrescue manual:
+ # https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Introduction
+ # "Ddrescue does not write zeros to the output when it finds
+ # bad sectors in the input, and does not truncate the output
+ # file if not asked to."
+ # https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Algorithm
+ # "If the output file is a regular file created by ddrescue,
+ # the areas marked as bad-sector will contain zeros."
+ self.assertRunOk(f"cmp {dev_img} {ddrescue_img}")
diff --git a/support/testing/tests/package/test_ddrescue/linux-ddrescue.fragment b/support/testing/tests/package/test_ddrescue/linux-ddrescue.fragment
new file mode 100644
index 0000000000..5cbe18a89f
--- /dev/null
+++ b/support/testing/tests/package/test_ddrescue/linux-ddrescue.fragment
@@ -0,0 +1,4 @@
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_MD=y
+CONFIG_BLK_DEV_DM=y
+CONFIG_DM_DUST=y
--
2.39.2
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2023-03-05 17:30 [Buildroot] [PATCH next 1/1] support/testing/tests/package/test_ddrescue.py: new runtime test Julien Olivain
2023-03-12 22:11 ` Thomas Petazzoni via buildroot
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