Always handle quoted arguments correctly in the launch script

Previously, arguments passed to the script were handled in one way
if a service was being started using start-stop-daemon and in another
way if start-stop-daemon wasn’t available or the application is being
launched in run mode. This meant that quoted arguments were only 
handled correctly when the application was being started using
start-stop-daemon.

This commit updates the launch script so that argument handling is
the same across all three different way that the application can be
launched.

Closes gh-5942

spring-boot-tools/spring-boot-loader-tools/src/main/resources/org/springframework/boot/loader/tools/launch.script

@@ -126,8 +126,7 @@ else
     exit 1
 fi
 
-# Build actual command to execute
+arguments=(-Dsun.misc.URLClassPath.disableJarChecking=true $JAVA_OPTS -jar $jarfile $RUN_ARGS "$@")
-command="$javaexe -Dsun.misc.URLClassPath.disableJarChecking=true $JAVA_OPTS -jar $jarfile $RUN_ARGS $*"
 
 # Action functions
 start() {
@@ -148,7 +147,6 @@ do_start() {
     chown "$run_user" "$pid_file"
     chown "$run_user" "$log_file"
     if [ $USE_START_STOP_DAEMON = true ] && type start-stop-daemon > /dev/null 2>&1; then
-      arguments=(-Dsun.misc.URLClassPath.disableJarChecking=true $JAVA_OPTS -jar $jarfile $RUN_ARGS "$@")
       start-stop-daemon --start --quiet \
         --chuid "$run_user" \
         --name "$identity" \
@@ -160,12 +158,12 @@ do_start() {
         >> "$log_file" 2>&1
       await_file "$pid_file"
     else
-      su -s /bin/sh -c "$command >> \"$log_file\" 2>&1 & echo \$!" "$run_user" > "$pid_file"
+      su -s /bin/sh -c "$javaexe $(printf "\"%s\" " "${arguments[@]}") >> \"$log_file\" 2>&1 & echo \$!" "$run_user" > "$pid_file"
     fi
     pid=$(cat "$pid_file")
   else
     checkPermissions || return $?
-    $command >> "$log_file" 2>&1 &
+    "$javaexe" "${arguments[@]}" >> "$log_file" 2>&1 &
     pid=$!
     disown $pid
     echo "$pid" > "$pid_file"
@@ -215,7 +213,7 @@ status() {
 
 run() {
   pushd "$(dirname "$jarfile")" > /dev/null
-  $command
+  "$javaexe" "${arguments[@]}"
   result=$?
   popd > /dev/null
   return "$result"