modified to tag the point where the RC was branched off

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@21667 71c3de6d-444a-0410-be80-ed276b4c234a

rc.sh

@@ -37,8 +37,12 @@ fi
 # create the release branch
 repo=https://www.dev.java.net/svn/hudson
 RC=$repo/branches/rc
+tag=$repo/tags/hudson-$(show-pom-version pom.xml | sed -e "s/-SNAPSHOT//g" -e "s/\\./_/g")-rc
+
 svn rm -m "deleting the old RC branch" $RC
-svn cp -m "creating a new RC branch" $repo/trunk/hudson/main $RC
+rev=$(svn info --xml . | xmlstarlet sel -t -v /info/entry/@revision)
+svn cp -m "tagging the branch point" $repo/trunk/hudson/main@$rev $tag
+svn cp -m "creating a new RC branch" $repo/trunk/hudson/main@$rev $RC
 
 # update changelog.html
 WWW=../../www