Configuration persistence.

Now configuration survives server reloads.

auto/help

@@ -17,6 +17,7 @@ cat << END
   --sbindir=DIRECTORY  set system admin executables directory name
                        default: "$NXT_SBINDIR"
   --modules=DIRECTORY  set modules directory name, default: "$NXT_MODULES"
+  --state=DIRECTORY    set state directory name, default: "$NXT_STATE"
 
   --pid=FILE           set pid filename, default: "$NXT_PID"
   --log=FILE           set log filename, default: "$NXT_LOG"

auto/options

@@ -55,6 +55,7 @@ do
         --bindir=*)                      NXT_BINDIR="$value"                 ;;
         --sbindir=*)                     NXT_SBINDIR="$value"                ;;
         --modules=*)                     NXT_MODULES="$value"                ;;
+        --state=*)                       NXT_STATE="$value"                  ;;
 
         --pid=*)                         NXT_PID="$value"                    ;;
         --log=*)                         NXT_LOG="$value"                    ;;
@@ -132,6 +133,11 @@ case "$NXT_MODULES" in
      *)  NXT_MODULES="$NXT_PREFIX$NXT_MODULES"  ;;
 esac
 
+case "$NXT_STATE" in
+    /*)  ;;
+     *)  NXT_STATE="$NXT_PREFIX$NXT_STATE"  ;;
+esac
+
 case "$NXT_PID" in
     /*)  ;;
      *)  NXT_PID="$NXT_PREFIX$NXT_PID"  ;;

auto/summary

@@ -10,6 +10,7 @@ Configuration summary:
   unit pid file:             "$NXT_PID"
   unit log file:             "$NXT_LOG"
   unit modules path:         "$NXT_MODULES"
+  unit state path:           "$NXT_STATE"
 
   unit control API socket:   "$NXT_CONTROL"