#!/usr/bin/ruby -w

def usage
  puts("Usage: unowned path")
  exit
end

path = (ARGV.shift || usage)

dlist = []
Dir["/var/lib/dpkg/info/*.list"].each{ |l|
  File.open(l).each{ |line|
    dlist << line.chomp
  }
}
print dlist.size, " files in dpkg lists\n"

# check: skip /home, /usr/src
f = open("|find #{path} -type f")
fs = f.readlines.collect{ |l| l.chomp }
f.close

puts "unowned files:"
diff = fs - dlist
print diff.sort.collect{ |l| l+$/ }