display-drives

#!/usr/bin/env ruby

# Shows the physical location of each disk

DEVICE_NAME = "sata_sil24"
FORMAT = {
  :scsi_id => 0..12,
  :media   => 13..20,
  :bus     => 21..29,
  :model   => 30..46,
  :rev     => 47..52,
  :dev     => 53..63,
  :size    => 64..71,
}

def device_to_id(device)
  Dir["/dev/disk/by-id/ata-*"].entries.detect do |e|
    File.readlink(e) =~ /#{File.basename(device)}$/
  end || "<>"
end

devices = `lsscsi -H`.split($/).
  map{|l| l.scan(/\[(\d+)\]\s+(\S+)/) }.
  map(&:first).
  select{|d| d[1] == DEVICE_NAME }.map(&:first)

info = `lsscsi -s`.split($/).map do |l|
  m = {}

  FORMAT.each {|key, index|
    m[key] = l[index].strip
  }

  m[:scsi_id] = m[:scsi_id].scan(/\[(\d:\d):\d:\d\]/).first.first
  m[:dev] = device_to_id(m[:dev])

  m
end

tower_devices = info.select{|i| i[:scsi_id] =~ /#{devices.join("|")}/}.sort_by{|i| i[:scsi_id] }

puts "|----------------------------------------------------------------------|"

tower_devices.each do |i|
  data = [
   i[:scsi_id].ljust(4),
   i[:dev].ljust(56),
   i[:size].rjust(8)
  ].join(" ")
  puts "|#{data}|"
puts "|----------------------------------------------------------------------|"
end