[PATCH 2/2] btrfs-progs: test for restoring multiple devices fs into a single device

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

Test that we are able to create an image from a multiple devices fs, that
we are able to restore that image into a single device and finally that we
are able to mount it.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 tests/misc-tests/020-image-multi-devices/test.sh | 49 ++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100755 tests/misc-tests/020-image-multi-devices/test.sh

diff --git a/tests/misc-tests/020-image-multi-devices/test.sh b/tests/misc-tests/020-image-multi-devices/test.sh
new file mode 100755
index 00000000..d4a5f006
--- /dev/null
+++ b/tests/misc-tests/020-image-multi-devices/test.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+# Test btrfs-image with multiple devices filesystem and verify that restoring
+# the created image works against a single device.
+
+source $TOP/tests/common
+
+check_prereq btrfs-image
+check_prereq mkfs.btrfs
+check_prereq btrfs
+
+setup_root_helper
+
+rm -f dev1 dev2
+run_check truncate -s 2G dev1
+run_check truncate -s 2G dev2
+
+loop1=$(run_check_stdout $SUDO_HELPER losetup --find --show dev1)
+loop2=$(run_check_stdout $SUDO_HELPER losetup --find --show dev2)
+
+# Create the test file system.
+
+run_check $SUDO_HELPER $TOP/mkfs.btrfs -f $loop1 $loop2
+run_check $SUDO_HELPER mount $loop1 $TEST_MNT
+run_check $SUDO_HELPER dd bs=1M count=1 if=/dev/zero of=$TEST_MNT/foobar
+orig_md5=$(run_check_stdout md5sum $TEST_MNT/foobar | cut -d ' ' -f 1)
+run_check $SUDO_HELPER umount $TEST_MNT
+
+# Create the image to restore later.
+run_check $SUDO_HELPER $TOP/btrfs-image $loop1 $IMAGE
+
+# Wipe out the filesystem from the devices, restore the image on a single
+# device, check everything works and file foobar is there and with 1Mb of
+# zeroes.
+run_check $SUDO_HELPER wipefs -a $loop1
+run_check $SUDO_HELPER wipefs -a $loop2
+
+run_check $SUDO_HELPER $TOP/btrfs-image -r $IMAGE $loop1
+
+run_check $SUDO_HELPER mount $loop1 $TEST_MNT
+new_md5=$(run_check_stdout md5sum $TEST_MNT/foobar | cut -d ' ' -f 1)
+run_check $SUDO_HELPER umount $TEST_MNT
+
+# Cleanup loop devices.
+run_check $SUDO_HELPER losetup -d $loop1
+run_check $SUDO_HELPER losetup -d $loop2
+rm -f dev1 dev2
+
+# Compare the file digests.
+[ $orig_md5 == $new_md5 ] || _fail "File digests do not match"
-- 
2.11.0