#!/usr/bin/ruby

require 'open3'

path = ARGV[0]
name = ARGV[1]

by_path = {}
by_adapter = {}

Dir.glob('/dev/dvb/*').sort.each do |a|
  Open3.popen3("udevadm test-builtin path_id $(udevadm info -q path -n #{a}/dvr0)") do |stdin, stdout, stderr, wait_thr|
    path_id = nil
    stdout.readlines.each do |line|
      line.strip!
      m = /^ID_PATH=(.*)$/.match(line)
      path_id = m[1] if m
    end

    if path_id
      by_path[path_id] = 0 unless by_path.has_key?(path_id)
      by_adapter[a] = "#{path_id};#{by_path[path_id]}"
      by_path[path_id] += 1
    end

  end
end

id = by_adapter[path]

if id
  puts id
else
  exit(1)
end