Fix JRUBY-4982: jruby embeds outdated timezone data via joda-time

Adds the ant task 'update-tzdata' and the tasks it depends on. 'update-tzdata' is a completely independent task, so it does not disrupt the current release process. So a call to the 'jar' task is still required for JRuby to see the new tzdata.

As described in http://ant.apache.org/manual/Tasks/ftp.html you'll need jakarta-commons-net-1.4.0 or later in a place ant can find.

build.xml

@@ -1442,6 +1442,7 @@
     <delete dir="${api.docs.dir}"/>
     <delete dir="src_gen"/>
     <antcall target="clean-ng"/>
+    <antcall target="clean-tzdata" />
   </target>
 
   <!-- FIXME: Cannot run Rake on clean until minijruby so keep this target -->
@@ -1499,4 +1500,63 @@
   <target name="test-rails-stable" depends="jar"><rake task="test:rails"/></target>
   <target name="test-prawn" depends="jar"><rake task="test:prawn"/></target>
   <target name="bench-language" depends="jar"><rake task="bench:language"/></target>
+
+  <target name="fetch-tzdata" description="Fetch tzdata into build/tzdata">
+    <mkdir dir="${tzdata.builddir}/src" />
+    <ftp server="${tzdata.ftpserver}"
+         action="get"
+         verbose="yes"
+         passive="yes"
+         userid="anonymous"
+         password="${tzdata.ftp.anonymous.userid}"
+         remotedir="/pub"
+         newer="yes">
+      <fileset dir="${tzdata.builddir}/src">
+        <include name="tzdata${tzdata.version}.tar.gz" />
+      </fileset>
+    </ftp>
+  </target>
+
+  <target name="expand-tzdata" depends="fetch-tzdata" description="Expand tzdata into build/tzdata">
+    <untar src="${tzdata.builddir}/src/tzdata${tzdata.version}.tar.gz"
+           compression="gzip"
+           dest="${tzdata.builddir}/src"
+    />
+  </target>
+
+  <!-- basically a copy of joda-time's compile.zoneinfo task -->
+  <target name="compile-tzdata" depends="expand-tzdata" description="Compile tzdata in build/tzdata">
+    <mkdir dir="${tzdata.builddir}/build" />
+    <mkdir dir="${tzdata.builddir}/build/org/joda/time/tz/data" />
+    <java classname="org.joda.time.tz.ZoneInfoCompiler"
+          fork="true"
+          failonerror="false">
+      <classpath path="${build.lib.dir}/joda-time-1.6.1.jar" />
+      <!-- Override default provider since data directory doesn't exist yet -->
+      <sysproperty key="org.joda.time.DateTimeZone.Provider"
+                   value="org.joda.time.tz.UTCProvider" />
+      <!-- Specify source and destination directories -->
+      <arg line="-src ${tzdata.builddir}/src -dst ${tzdata.builddir}/build/org/joda/time/tz/data" />
+      <!-- Specify all the data files to compile -->
+      <arg value="africa" />
+      <arg value="antarctica" />
+      <arg value="asia" />
+      <arg value="australasia" />
+      <arg value="europe" />
+      <arg value="northamerica" />
+      <arg value="southamerica" />
+      <arg value="pacificnew" />
+      <arg value="etcetera" />
+      <arg value="backward" />
+      <arg value="systemv" />
+    </java>
+  </target>
+
+  <target name="update-tzdata" depends="compile-tzdata" description="Update joda-time's zone info with one we compiled">
+    <jar update="yes" destfile="${build.lib.dir}/joda-time-1.6.1.jar" basedir="${tzdata.builddir}/build" />
+  </target>
+
+  <target name="clean-tzdata" description="Remove files used for updating time zone information">
+    <delete dir="${tzdata.builddir}" failonerror="no" />
+  </target>
 </project>

default.build.properties

@@ -68,3 +68,7 @@ version.ruby1_9.revision=27758
 version.jruby=1.6.0.dev
 mspec.revision=7e5d31bc7030458722efc4362af85bfe8955634c
 rubyspecs.revision=9036db900b98eb2607a057384bb31e81e9b59798
+tzdata.builddir=build/tzdata
+tzdata.ftpserver=elsie.nci.nih.gov
+tzdata.ftp.anonymous.userid=jruby@jruby.org
+tzdata.version=2010l