add environment variables script

Use faststart.sh for get_vpn_interface
-- Tim Niemeyer <tim.niemeyer@mastersword.de>

bsp/default/root_file_system/etc/environment.sh

@@ -0,0 +1,54 @@
+#!/bin/ash
+
+# functions
+#FIXME: define here your favorite methods to get the values
+get_wlan_client_interface() {
+  echo "wlan0"
+}
+
+get_wlan_mesh_interface() {
+  echo "wlan0-1"
+}
+
+get_eth_client_interface() {
+  echo ""
+}
+
+get_eth_mesh_interface() {
+  echo ""
+}
+
+get_bridge_interface() {
+  echo "br-mesh"
+}
+
+get_batman_interface() {
+  echo "bat0"
+}
+
+get_vpn_interface() {
+  test -f /etc/fastdstart.sh || exit;
+  local $(grep -o project=.* /etc/fastdstart.sh)
+  echo ${project}VPN | tr -d '"'
+}
+
+get_debug_level() {
+  echo "0"
+}
+
+print_definitions() {
+  echo "# interfaces"
+  echo "WLAN_CLIENT_INTERFACE=$(get_wlan_client_interface)"
+  echo "WLAN_MESH_INTERFACE=$(get_wlan_mesh_interface)"
+  echo "ETH_CLIENT_INTERFACE=$(get_eth_client_interface)"
+  echo "ETH_MESH_INTERFACE=$(get_eth_mesh_interface)"
+  echo "BRIDGE_INTERFACE=$(get_bridge_interface)"
+  echo "BATMAN_INTERFACE=$(get_batman_interface)"
+  echo "VPN_INTERFACE=$(get_vpn_interface)"
+  echo ""
+  echo "# variables"
+  echo "DEBUG=$(get_debug_level)"
+}
+
+# program
+print_definitions