remove directory with contents of unpacked war file on uninstall

rpm/minerva.spec.in

@@ -41,10 +41,12 @@ if ! su - postgres -c "psql --dbname map_viewer -q -c '\q'" 2> /dev/null; then
 fi
 
 %preun -p /bin/bash
-# save version information of the old package to make sure we run the correct DB-update script after installation
 if [ $1 == 1 ]; then
+    # save version information of the old package to make sure we run the correct DB-update script after installation
     mkdir -p %{_sharedstatedir}/rpm-state/%{name}
     echo -n %{version} > %{_sharedstatedir}/rpm-state/%{name}/OLD_VERSION
+    # remove old unpacked ("exploded") directory of war file
+    rm -rf %{_sharedstatedir}/tomcat/webapps/%{name}
 fi
 
 %posttrans -p /bin/bash