I can't move a folder onto a UNC path. So a
mv src,dest, :verbose => true, :force => true
where dest is a windows share doesn't do anything. Mapping the share doesn't help, and mounting the share in linux doesn't do anything either. It doesn't throw any errors, but no files are moved. I can reproduce this easy enough with a gem generate_index -d <share_name> where <share_name> can be a UNC path, a mounted drive pointing to a windows share, or a linux mount point which mounts the windows share.
The RubyFile.java class does throw the "throw runtime.newErrnoEACCESError(oldNameJavaString + " or " + newNameJavaString);" exception, but FuleUtils.rb seems to ignore it.
This could be related to http://jira.codehaus.org/browse/JRUBY-2724