check: increment bash requirement version from 4.2 to 4.3

The helper functions _get_nvmet_ports() and _get_nvmet_port_params() use
the bash 'nameref' feature, introduced in the bash version 4.3.
Currently, blktests README and the check script declare bash version
4.2 as the minimum bash version, leading to a version mismatch.

Fix this inconsistency by updating the minimum required bash version
to 4.3. Note that bash 4.2 was released in 2011, while bash 4.3 was
released in 2014. This change is unlikely to affect blktests users.

Reviewed-by: Chaitanya Kulkarni <[email protected]>
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: kawasaki

README.md

@@ -12,7 +12,7 @@ filesystem testing framework. It was originally written by Omar Sandoval and
 
 The dependencies are minimal, but make sure you have them installed:
 
-- bash (>= 4.2)
+- bash (>= 4.3)
 - GNU coreutils
 - GNU awk
 - util-linux

check

@@ -1083,11 +1083,11 @@ _check_dependencies() {
 	local -A required_commands_and_packages
 	local cmd
 
-	# Require bash version 4.2
+	# Require bash version 4.3
 	IFS='.' read -r v1 v2 v3 < <(bash --version | grep version | head -1 | \
 					   sed 's/.*version \([0-9.]\+\).*/\1/')
-	if ((v1 * 65536 + v2 * 256 + v3 < 4 * 65536 + 2 * 256)); then
-		_warning "bash version is older than 4.2"
+	if ((v1 * 65536 + v2 * 256 + v3 < 4 * 65536 + 3 * 256)); then
+		_warning "bash version is older than 4.3"
 	fi
 
 	# Check dependent commands to run blktests