xfs: test mkfs.xfs config files

Simple tests of the upcoming mkfs.xfs config file feature.  First we
have some simple tests of properly formatted config files, then
improperly formatted config files, and finally we try to spot
conflicts between config file options and the cli.

[dchinner: updated for new libinih-based implementation.]

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/xfs/526

@@ -0,0 +1,64 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2020 Oracle.  All Rights Reserved.
+#
+# FS QA Test No. 526
+#
+# Test formatting with conflicts between the config file and the cli.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap '_cleanup; exit $status' 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.* $def_cfgfile
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_require_test
+_require_scratch_nocheck
+_require_xfs_mkfs_cfgfile
+
+cfgfile=$TEST_DIR/a
+rm -rf $cfgfile
+
+# disable crc in config file, enable rmapbt (which requires crc=1) in cli
+cat > $cfgfile << ENDL
+[metadata]
+crc = 0
+ENDL
+
+$MKFS_XFS_PROG -c options=$cfgfile -f -m rmapbt=1 $SCRATCH_DEV > $tmp.mkfs 2>&1
+cat $tmp.mkfs >> $seqres.full
+grep 'rmapbt not supported without CRC support' $tmp.mkfs
+
+# enable rmapbt (which requires crc=1) in config file, disable crc in cli
+cat > $cfgfile << ENDL
+[metadata]
+rmapbt = 1
+ENDL
+
+$MKFS_XFS_PROG -c options=$cfgfile -f -m crc=0 $SCRATCH_DEV > $tmp.mkfs 2>&1
+cat $tmp.mkfs >> $seqres.full
+grep 'rmapbt not supported without CRC support' $tmp.mkfs
+
+# success, all done
+status=0
+exit