#57 https://stackoverflow.com/questions/49944085/configure-dynamic-co…

…mmand-line-arguments-in-sbt-native-packager add in java.rmi.server.hostname

package.sbt

@@ -53,4 +53,6 @@ mappings in Universal ++= (proguard in Proguard).value.map(jar => jar -> ("lib/"
 // point the classpath to the output from the proguard task
 scriptClasspath := (proguard in Proguard).value.map(jar => jar.getName)
 
-bashScriptExtraDefines ++= IO.readLines(sourceDirectory.value / "universal" / "conf" / "find_ip.sh")
+bashScriptExtraDefines ++= IO.readLines(sourceDirectory.value / "universal" / "conf" / "find_ip.sh")
+
+bashScriptExtraDefines += """addJava "-Djava.rmi.server.hostname=$(getIpAddress)""""

src/universal/conf/application.ini

@@ -4,14 +4,14 @@
 #
 #   cat application.ini | grep sed '/^\#/d;s/\r$//'
 #
-# To get the externally facing IP address, we use a function defined 
-# in another file which is pulled into the main script
+# To get the externally facing IP address (java.rmi.server.hostname), 
+# we use a function defined in another file which is expanding via 
+# bashScriptExtraDefines (see https://bit.ly/2raOEN4)
 
 -J-Xms256m
 -J-Xmx512m
 -Dcom.sun.management.jmxremote=true 
 -Dcom.sun.management.jmxremote.port=1616 
 -Dcom.sun.management.jmxremote.authenticate=false 
 -Dcom.sun.management.jmxremote.ssl=false 
--Djava.rmi.server.hostname="$(getIpAddress)" 
 -Dconfig.file=/home/pi/.temperature/temperature-machine.cfg