"/tmp/bff" is actually leftover from how the AIX building got handed off to me.  i meant to convert to Dir.mktmpdir but there was so much else to fix...  i did leave it because i wasn't super concerned about symlink-in-tmp attacks at the time.  since omnibus is public, i'd probably fix it, since you never know what kind of silliness someone is likely to do with your code in the wild...