[PATCH v5 02/12] common/rc: Add _require_fio_version helper

[Ojaswin Mujoo <ojaswin@linux.ibm.com>]

The main motivation of adding this function on top of _require_fio is
that there has been a case in fio where atomic= option was added but
later it was changed to noop since kernel didn't yet have support for
atomic writes. It was then again utilized to do atomic writes in a later
version, once kernel got the support. Due to this there is a point in
fio where _require_fio w/ atomic=1 will succeed even though it would
not be doing atomic writes.

Hence, add an explicit helper to ensure tests to require specific
versions of fio to work past such issues.

Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
---
 common/rc | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/common/rc b/common/rc
index 35a1c835..f45b9a38 100644
--- a/common/rc
+++ b/common/rc
@@ -5997,6 +5997,38 @@ _max() {
 	echo $ret
 }
 
+# Check the required fio version. Examples:
+#   _require_fio_version 3.38 (matches 3.38 only)
+#   _require_fio_version 3.38+ (matches 3.38 and above)
+#   _require_fio_version 3.38- (matches 3.38 and below)
+_require_fio_version() {
+	local req_ver="$1"
+	local fio_ver
+
+	_require_fio
+	_require_math
+
+	fio_ver=$(fio -v | cut -d"-" -f2)
+
+	case "$req_ver" in
+	*+)
+		req_ver=${req_ver%+}
+		test $(_math "$fio_ver >= $req_ver") -eq 1 || \
+			_notrun "need fio >= $req_ver (found $fio_ver)"
+		;;
+	*-)
+		req_ver=${req_ver%-}
+		test $(_math "$fio_ver <= $req_ver") -eq 1 || \
+			_notrun "need fio <= $req_ver (found $fio_ver)"
+		;;
+	*)
+		req_ver=${req_ver%-}
+		test $(_math "$fio_ver == $req_ver") -eq 1 || \
+			_notrun "need fio = $req_ver (found $fio_ver)"
+		;;
+	esac
+}
+
 ################################################################################
 # make sure this script returns success
 /bin/true
-- 
2.49.0