Detect the updates to <tt>hudson.war</tt> and report it.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11397 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/UpdateCenter.java

@@ -244,6 +244,13 @@ public class UpdateCenter implements ModelObject {
                 plugins.put(e.getKey(),new Plugin(e.getValue()));
             }
         }
+
+        /**
+         * Is there a new version of the core?
+         */
+        public boolean hasCoreUpdates() {
+            return core.isNewerThan(Hudson.VERSION);
+        }
     }
 
     public static class Entry {

core/src/main/resources/hudson/model/Hudson/manage.jelly

@@ -32,6 +32,10 @@
       </script>
       <span id="message"></span>
     </j:if>
+    <j:set var="ucData" value="${it.updateCenter.data}" />
+    <j:if test="${ucData.hasCoreUpdates()}">
+      <div class="warning">${%NewVersionAvailable(ucData.core.version,ucData.core.url)}</div>
+    </j:if>
     <table style="padding-left: 2em;">
       <local:feature icon="setting.gif"          href="configure"    title="${%Configure System}">
         ${%Configure global settings and paths.}  

core/src/main/resources/hudson/model/Hudson/manage.properties

 SystemLogText=\
-System log captures output from <tt>java.util.logging</tt> output related to Hudson.
\ No newline at end of file
+System log captures output from <tt>java.util.logging</tt> output related to Hudson.
+NewVersionAvailable=New version of Hudson ({0}) is available for <a href="{1}">download</a>.
\ No newline at end of file