rackspace cell ID (sorta) in ohai v7

rackspace_cell.rb

# Test:
#  $ ohai -d `pwd` rackspace
#
# this plugin adds the rackspace cell to the rackspace cloud data

def private_gateway
  _, stdout, _ = run_command(no_status_check: true, command: "ip route show | grep eth1 | grep via | head -1 | awk '{print $3}'")
  if stdout.length > 0
    return stdout
  else
    return nil
  end
rescue Ohai::Exceptions::Exec
  return nil
end

# Get rackspace cloud "cell".
def find_cell
  cell_map = {
    '10.223.240.1' => 'ord-a0001',
    '10.223.224.1' => 'ord-a0002',
    '10.223.192.1' => 'ord-a0003',
    '10.223.176.1' => 'ord-a0004',
    '10.223.144.1' => 'ord-a0005',
    '10.223.96.1'  => 'ord-a0006',
    '10.209.64.1'  => 'ord-b0001',
    '10.209.96.1'  => 'ord-b0002',
    '10.209.128.1' => 'ord-b0003',
    '10.209.160.1' => 'ord-b0004',
    '10.210.32.1'  => 'ord-b0005',
    '10.210.64.1'  => 'ord-b0006',
    '10.210.0.1'   => 'ord-b0007',
    '10.210.96.1'  => 'ord-b0008',
    '10.210.128.1' => 'ord-b0009',
    '10.210.192.1' => 'ord-b0010',
    '10.211.0.1'   => 'ord-b0011',
    '10.176.160.1' => 'ord-c0001',
    '10.177.0.1'   => 'ord-c0002',
    '10.176.192.1' => 'ord-c0003',
    '10.176.128.1' => 'ord-c0004',
    '10.176.96.1'  => 'ord-c0005',
    '10.177.128.1' => 'ord-c0006',
    '10.178.0.1'   => 'ord-c0007',
    '10.178.128.1' => 'ord-c0008',
    '10.178.192.1' => 'ord-c0009',
    '10.208.0.1'   => 'ord-c0010',
    '10.208.128.1' => 'ord-c0011',
    '10.209.0.1'   => 'ord-c0012'
  }
  cell_map[private_gateway] || private_gateway
end

Ohai.plugin(:RackspaceCell) do
  provides 'rackspace/cell'
  depends 'rackspace'

  collect_data do
    unless rackspace.nil?
      Ohai::Log.info('Rackspace_cell: rackspace detected, adding cell to OHAI data')
      rackspace[:cell] = find_cell
      Ohai::Log.info("ohai 'cloud' data: #{cloud.inspect}")
    end
  end
end