net: make terminal configurable in config file

Change-Id: I0afb6b0242c399334a2c37f18a5d26d5beeabedc

net/config_2g3g

@@ -1,3 +1,7 @@
+# Terminal for launching Osmocom programs
+# Supported: auto, urxvt, xterm
+TERMINAL="auto"
+
 ETH_DEV=eth0
 APN_DEV=apn0
 

net/templates/run.sh

@@ -44,10 +44,27 @@ mkdir -p "$logdir"
 find_term() {
   # Find a terminal program and write to the global "terminal" variable
   local programs="urxvt xterm"
+
+  if [ -n "${TERMINAL}" ] && [ "${TERMINAL}" != "auto" ]; then
+    case " $programs " in
+      *" ${TERMINAL} "*)
+        echo "Terminal: ${TERMINAL} (from config)"
+        terminal="${TERMINAL}"
+        return
+        ;;
+    esac
+
+    echo "ERROR: Terminal '${TERMINAL}' is not in list of supported terminals ($programs)"
+    exit 1
+  fi
+
   local program
   for program in $programs; do
     terminal="$(which $program)"
-    [ -n "$terminal" ] && return
+    if [ -n "$terminal" ]; then
+      echo "Terminal: $program (auto)"
+      return
+    fi
   done
 
   # No terminal found