btrfs-progs: tests: add misc tests for uuid rewrite

Simple tests of the -u/-U options of btrfstune.

Signed-off-by: David Sterba <dsterba@suse.cz>

tests/misc-tests/002-uuid-rewrite/test.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+# test btrfstune uuid rewriting options
+
+source $TOP/tests/common
+
+check_prereq btrfs-debug-tree
+check_prereq btrfs-show-super
+check_prereq mkfs.btrfs
+check_prereq btrfstune
+
+if [ -z $TEST_DEV ]; then
+	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
+		$RESULTS
+	TEST_DEV="$TOP/tests/test.img"
+
+	# Need at least 1G to avoid mixed block group, which extent tree
+	# rebuild doesn't support.
+	run_check truncate -s 1G $TEST_DEV
+fi
+
+if [ -z $TEST_MNT ];then
+	echo "    [NOTRUN] extent tree rebuild, need TEST_MNT variant"
+	exit 0
+fi
+
+get_fs_uuid() {
+	local image
+
+	image="$1"
+	run_check_stdout $TOP/btrfs-show-super "$image" | \
+		grep '^fsid' | awk '{print $2}'
+}
+
+test_uuid_random()
+{
+	local origuuid
+
+	origuuid=11111111-a101-4031-b29a-379d4f8b7a2d
+
+	run_check $SUDO_HELPER $TOP/mkfs.btrfs -f \
+		--uuid $origuuid \
+		--rootdir $TOP/Documentation \
+		$TEST_DEV
+	run_check $TOP/btrfs-show-super "$TEST_DEV"
+	run_check $TOP/btrfstune -f -u $TEST_DEV
+	# btrfs-show-super is called within get_fs_uuid
+	fsid=$(get_fs_uuid $TEST_DEV)
+	run_check $SUDO_HELPER $TOP/btrfs check $TEST_DEV
+}
+
+test_uuid_user()
+{
+	local origuuid
+	local newuuid
+
+	origuuid=22222222-d324-4f92-80e9-7658bf3b845f
+	newuuid=33333333-bfc9-4045-9399-a396dc6893b3
+
+	run_check $SUDO_HELPER $TOP/mkfs.btrfs -f \
+		--uuid $origuuid \
+		--rootdir $TOP/Documentation \
+		$TEST_DEV
+	run_check $TOP/btrfs-show-super "$TEST_DEV"
+	run_check $TOP/btrfstune -f -U $newuuid \
+		$TEST_DEV
+	# btrfs-show-super is called within get_fs_uuid
+	fsid=$(get_fs_uuid $TEST_DEV)
+	if ! [ $fsid = $newuuid ]; then
+		_fail "FAIL: UUID not rewritten"
+	fi
+	run_check $SUDO_HELPER $TOP/btrfs check $TEST_DEV
+}
+
+test_uuid_random
+test_uuid_user