enable use of jna in debian packages

Patch by eevans and paul cannon for CASSANDRA-1689

git-svn-id: https://svn.apache.org/repos/asf/cassandra/trunk@1048903 13f79535-47bb-0310-9956-ffa450edef68

debian/control

@@ -11,6 +11,7 @@ Standards-Version: 3.8.3
 Package: cassandra
 Architecture: all
 Depends: openjdk-6-jre-headless (>= 6b11) | java6-runtime, jsvc (>= 1.0), libcommons-daemon-java (>= 1.0), adduser
+Recommends: libjna-java
 Description: distributed storage system for structured data
  Cassandra is a distributed (peer-to-peer) system for the management
  and storage of structured data.

debian/default

@@ -0,0 +1,7 @@
+# NOTICE: See also /etc/cassandra/cassandra-env.sh
+
+# EXTRA_CLASSPATH provides the means to extend Cassandra's classpath with
+# additional libraries.  It is formatted as a colon-delimited list of
+# class directories and/or jar files.  For example, to enable the
+# JMX-to-web bridge install libmx4j-java and uncomment the following.
+#EXTRA_CLASSPATH="/usr/share/java/mx4j-tools.jar"

debian/init

@@ -77,11 +77,14 @@ fi
 #
 classpath()
 {
-    cp=
+    cp="$EXTRA_CLASSPATH"
     for j in /usr/share/$NAME/*.jar; do
         [ "x$cp" = "x" ] && cp=$j || cp=$cp:$j
     done
 
+    # use JNA if installed in standard location
+    [ -r /usr/share/java/jna.jar ] && cp="$cp:/usr/share/java/jna.jar"
+
     # Include the conf directory for purposes of log4j-server.properties, and
     # commons-daemon in support of the daemonization class.
     printf "$cp:$CONFDIR:/usr/share/java/commons-daemon.jar"