Preserve Ubuntu L&F after install

Closes #136

ant/linux/linux-installer.sh.in

@@ -151,6 +151,32 @@ function restart_it() {
     fi
 }
 
+# Provide user environmental variables to the sudo environment
+function sudo_env() {
+    userid="$(logname 2>/dev/null || echo $SUDO_USER)"
+    pid=$(ps aux |grep "^$userid" |grep "dbus-daemon" | grep "unix:" |awk '{print $2}')
+    # Replace null delimiters with newline for grep
+    envt=$(cat "/proc/$pid/environ" |tr '\0' '\n')
+
+    # List of environmental variables to use; adjust as needed
+    # UPSTART_SESSION must come before GNOME_DESKTOP_SESSION_ID
+    exports=( "UPSTART_SESSION" "DISPLAY" "DBUS_SESSION_BUS_ADDRESS" "XDG_CURRENT_DESKTOP" "GNOME_DESKTOP_SESSION_ID" )
+
+    for i in "${exports[@]}"; do
+        # Re-set the variable within this session by name
+        # Careful, this technique won't yet work with spaces
+        if echo "$envt" | grep "^$i=" > /dev/null 2>&1; then
+            eval "$(echo "$envt" | grep "^$i=")" > /dev/null 2>&1
+	    export $i > /dev/null 2>&1
+	elif initctl --user get-env $i > /dev/null 2>&1; then
+            eval "$i=$(initctl --user get-env $i)" > /dev/null 2>&1
+	    export $i > /dev/null 2>&1
+	fi
+
+        echo "$i=${!i}"
+    done
+}
+
 # Check for Ubuntu to fix System Tray
 grep -q "Ubuntu" /etc/lsb-release > /dev/null 2>&1
 if [ $? -eq 0 ]; then
@@ -202,7 +228,9 @@ if [ $? -ne 0 ]; then
     progress_dialog 100 "Finished.  Please launch ${project.name} manually."
 else
     # Start ${project.name} as the user that's logged in
-    sudo -u $(logname 2>/dev/null || echo $SUDO_USER) nohup "java" ${launch.opts} -jar "${jarfile}" > /dev/null 2>&1 &
+    sudo_env
+    userid="$(logname 2>/dev/null || echo $SUDO_USER)"
+    sudo -E -u $userid nohup "java" ${launch.opts} -jar "${jarfile}" > /dev/null 2>&1 &
     progress_dialog 100 "Finished.  ${project.name} should start automatically."
 fi
 echo