|
|
@@ -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}")
|
Julien Olivain