json-to-command.sh: recover lockhammer command from json

This program recovers a lockhammer lh_test command line from the
measurement record in a results json.

Change-Id: I9ed51c01f94aa9ba592b7638bb7d937804c5a158
Signed-off-by: James Yang <[email protected]>

Author: jty2

benchmarks/lockhammer/scripts/json-to-command.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# SPDX-FileCopyrightText: Copyright 2025 Arm Limited and/or its affiliates <[email protected]>
+# SPDX-License-Identifier: BSD-3-Clause
+
+# This program recovers a lockhammer lh command from a results json and the meas_number to rerun a measurement.
+
+usage() {
+echo "$0 json_file [meas_number]"
+exit -1
+}
+
+rebuild_flags() {
+	local FILE=$1
+	local MEAS_NUMBER=$2
+
+	local LH_COMMON_FLAGS='-Y -D 1 -M 1G'
+
+	local LH_EXE='build.\(.variant_name)\(if .tag then "."+.tag else "" end)/lh_\(.test_name)'
+	local LH_CRIT='-c \(.nominal_critical)\(.nominal_critical_unit)'
+	local LH_PAR='-p \(.nominal_parallel)\(.nominal_parallel_unit)'
+
+# the old way to detect pinorder string is not a thread_num, but pinorder_string may now be a range and not always a pure number
+#	local LH_PINORDER='\(if ((.pinorder_string | startswith("t")) or ((.pinorder_string | tonumber) == .num_threads)) then "-t"+.pinorder_string else "-o"+.pinorder_string end)'
+
+	local LH_PINORDER='\(if ((.pinorder_string | startswith("t"))) then "-t"+.pinorder_string else "-o"+.pinorder_string end)'
+
+	local LH_COMMAND="$LH_EXE $LH_CRIT $LH_PAR $LH_PINORDER $LH_COMMON_FLAGS"
+
+	# if no measurement number if given, then all of the results records are processed
+	if [ -z "$MEAS_NUMBER" ]; then
+		jq -e -r ".results[] | \"$LH_COMMAND\"" "$FILE"
+	else
+		jq -e --argjson i "$MEAS_NUMBER" -r ".results[] | select(.meas_number == \$i) | \"$LH_COMMAND\"" "$FILE"
+	fi
+}
+
+MEAS_NUMBER=$2
+FILE=$1
+
+if [ -z "$FILE" ]; then
+	echo "ERROR: missing json file"
+	usage
+fi
+
+if [ -n "$MEAS_NUMBER" ]; then
+
+	# check if there is a record with the value of the meas_number
+	if ! jq -e --argjson i "$MEAS_NUMBER" -r ".results[] | select(.meas_number == \$i)" "$FILE" > /dev/null; then
+		echo "ERROR: did not find a result with .meas_number == $MEAS_NUMBER in $FILE"
+		exit -1
+	fi
+fi
+
+rebuild_flags "$FILE" $MEAS_NUMBER
+
+exit 0