Sort tapes. This is dumb.

sorter.rb

#!/usr/bin/env ruby

require 'pp'

current_slots = Hash.new
current_index = Array.new

temp_slot = 281

File.open("tapes-in-slots.txt") do |file|
  file.each do |line| 
    line =~ /Storage Element (\d*):.*VolumeTag=(\w\w\w\d\d\d)(L.)?/
    current_slots[$2] = $1
    current_index[$1.to_i] = $2
  end
end
  
destination_slot = 1

for prefix in [ "TSM", "LSI", "TAR", "GWZ", "SCR", "GWO", "OSB" ] do
  for i in (1 .. 999) do
    tape_name = "%s%0.3d" % [prefix, i]
    next if current_slots[tape_name].nil?
      # tape in right spot, move along
      if current_slots[tape_name].to_i == destination_slot
        destination_slot += 1
        next;
        
      else
        source_slot = current_slots[tape_name]
        wrong_tape = current_index[destination_slot]


        # there may not be a tape in the destination slot, so just move 
        if wrong_tape.nil?
          puts "# Moving #{tape_name} from #{source_slot} to #{destination_slot}, which is currently empty."
          puts "mtx -f /dev/sg7 transfer #{source_slot} #{destination_slot}"
          current_index[destination_slot.to_i] = tape_name
          current_slots[tape_name] = destination_slot
                    
        else
          puts "# Moving #{tape_name} to #{destination_slot}.  Currently in #{source_slot}, swapping with #{wrong_tape}."
          

          # move slot destination_slot to temp_slot
          puts "mtx -f /dev/sg7 transfer #{destination_slot} #{temp_slot}"
          # move source_slot to destination_slot
          puts "mtx -f /dev/sg7 transfer #{source_slot} #{destination_slot}"
          # move temp_slot to source_slot
          puts "mtx -f /dev/sg7 transfer #{temp_slot} #{source_slot}"
        
          # update current_slots and current_index for source_slot
          current_index[destination_slot.to_i] = tape_name
          current_index[source_slot.to_i] = wrong_tape
        
          current_slots[tape_name] = destination_slot
          current_slots[wrong_tape] = source_slot
        
        end

        destination_slot += 1
      end

  end
end