save and restore previous custom dir

OPSI/preinst

@@ -7,3 +7,27 @@
 #   PRODUCT_ID: id of the current product
 #   CLIENT_DATA_DIR: directory where client data will be installed
 #
+
+TMP_DIR=${CLIENT_DATA_DIR}/../${PRODUCT_ID}.tmp
+
+if [ -d $TMP_DIR ]; then
+	echo "Temporary directory $TMP_DIR already exist, aborting!" 1>&2
+	exit 1
+fi
+
+[ ! -d $CLIENT_DATA_DIR ] && mkdir $CLIENT_DATA_DIR
+mkdir $TMP_DIR
+
+if [ -d $CLIENT_DATA_DIR ]; then
+	echo "Saving previous directories..."
+	for dirname in custom ; do
+		for path in $CLIENT_DATA_DIR/$dirname; do
+			if [ -e $path ]; then
+				echo "   moving $path to $TMP_DIR"
+				mv $path $TMP_DIR/ || exit 1
+			fi
+		done
+	done
+fi
+
+exit 0