[PATCH v2 1/2] common/xfs: Check if write supports [-c|-d] option in xfs_db

[xiao yang <yangx.jy@cn.fujitsu.com>]

Make sure _scratch_xfs_set_metadata_field() can be used on an
old xfsprogs-dev(e.g. v3.1.1).

The "-d" option was introduced since xfsprogs-dev v4.7.0 by commit
86769b3 ("xfs_db: allow recalculating CRCs on invalid metadata").

The special argument "--" is only used to end option-scanning
in getopt().  getopt() was introduced since xfsprogs-dev v3.2.3 by
commit c9f5e3d ("xfs_db: Allow writes of corrupted data")'.

Signed-off-by: xiao yang <yangx.jy@cn.fujitsu.com>
---
 common/xfs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/common/xfs b/common/xfs
index 45b84a0..59d6dd3 100644
--- a/common/xfs
+++ b/common/xfs
@@ -658,8 +658,11 @@ _scratch_xfs_set_metadata_field()
 	for arg in "$@"; do
 		cmds+=("-c" "${arg}")
 	done
-	_scratch_xfs_db -x "${cmds[@]}" -c "write -d ${key} -- ${value}"
-	echo
+
+	local wr_cmd="write"
+	_scratch_xfs_db -x -c "help write" | egrep -q "(-c|-d)" && value="-- $value"
+	_scratch_xfs_db -x -c "help write" | egrep -q "(-d)" && wr_cmd="${wr_cmd} -d"
+	_scratch_xfs_db -x "${cmds[@]}" -c "${wr_cmd} ${key} ${value}"
 }
 
 _scratch_xfs_get_sb_field()
-- 
1.8.3.1