btrfs-progs: test for restoring multiple devices fs into a single device

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>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
[ added shell quotation and chmod a+w so testsuite on NFS works ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/tests/misc-tests/021-image-multi-devices/test.sh b/tests/misc-tests/021-image-multi-devices/test.sh
new file mode 100755 (executable)
index 0000000..abf67f9
--- /dev/null
+++ b/tests/misc-tests/021-image-multi-devices/test.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+# Test btrfs-image with multiple devices filesystem and verify that restoring
+# the created image works against a single device.
+
+source "$TOP/tests/common"
+
+check_prereq btrfs-image
+check_prereq mkfs.btrfs
+check_prereq btrfs
+
+setup_root_helper
+
+rm -f dev1 dev2
+run_check truncate -s 2G dev1
+run_check truncate -s 2G dev2
+chmod a+w dev1 dev2
+
+loop1=$(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"