#57 add a script to get the IP address

package.sbt

@@ -51,4 +51,6 @@ mappings in Universal := (mappings in Universal).value.
 mappings in Universal ++= (proguard in Proguard).value.map(jar => jar -> ("lib/" + jar.getName))
 
 // point the classpath to the output from the proguard task
-scriptClasspath := (proguard in Proguard).value.map(jar => jar.getName)
+scriptClasspath := (proguard in Proguard).value.map(jar => jar.getName)
+
+bashScriptExtraDefines ++= IO.readLines(sourceDirectory.value / "universal" / "conf" / "find_ip.sh")

src/universal/conf/find_ip.sh

@@ -0,0 +1,11 @@
+# Pi specific function to try and find the externally facing IP address
+getIpAddress() {
+    local eth0=`grep "eth0" /proc/net/dev`
+    if  [ -n "eth0" ] ; then
+       local lan="eth0"
+    else
+       local lan="wlan0"
+    fi
+    echo $( ip -f inet addr show ${lan} | grep -Po 'inet \K[\d.]+' )
+}
+