btrfs-progs: tests: add misc test for fs features

A sample test for the misc-test category. Verify that btrfstune sets the
requested fs features. Now implemented extrefs, skinny-metadata and
seeding.

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

tests/misc-tests/001-btrfstune-features/test.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+# test btrfstune options that enable filesystem features
+
+source $TOP/tests/common
+
+check_prereq btrfs-debug-tree
+check_prereq btrfs-show-super
+check_prereq mkfs.btrfs
+setup_root_helper
+
+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 $TEST_MNT ];then
+	echo "    [NOTRUN] extent tree rebuild, need TEST_MNT variant"
+	exit 0
+fi
+
+# test whether fsck can rebuild a corrupted extent tree
+# parameters:
+# - option for mkfs.btrfs -O, empty for defaults
+# - option for btrfstune
+# - string representing the feature in btrfs-show-super dump
+test_feature()
+{
+	local mkfsfeatures
+	local tuneopt
+	local sbflag
+
+	mkfsfeatures=${1:+-O ^$1}
+	tuneopt="$2"
+	sbflag="$3"
+
+	run_check $SUDO_HELPER $TOP/mkfs.btrfs -f $mkfsfeatures $TEST_DEV
+	if run_check_stdout $TOP/btrfs-show-super $TEST_DEV | \
+			grep -q "$sbflag"; then
+		_fail "FAIL: feature $sbflag must not be set on the base image"
+	fi
+	run_check $TOP/btrfstune $tuneopt $TEST_DEV
+	if ! run_check_stdout $TOP/btrfs-show-super $TEST_DEV | \
+			grep -q "$sbflag"; then
+		_fail "FAIL: feature $sbflag not set"
+	fi
+	run_check $SUDO_HELPER $TOP/btrfs check $TEST_DEV
+}
+
+test_feature extref -r EXTENDED_IREF
+test_feature skinny-metadata -x SKINNY_METADATA
+test_feature '' '-S 1' SEEDING