Get USB bus/port information from serial number.

get_port_from_serial.rb

#!/usr/bin/env ruby

=begin
Pass the serial number of device to this program, it will print the corresponding usb bus/port info.

Example:

$ adb devices
List of devices attached 
56789AAAAAAAAAA	device

$ lsusb -v
Bus 003 Device 027: ID 05c7:1234 Corey, Inc. 
Device Descriptor:
  bLength                18
  ......
  iProduct                2 Android
  iSerial                 3 56789AAAAAAAAAA
  bNumConfigurations      ......

$ ruby get_port_from_serial.rb 56789AAAAAAAAAA
=> 003/027

=end

def get_port_from_serial(serial, info) 
  info.each_line do |line| 
    if line.match('\bBus\b.*\bDevice\b') 
      @bus = line.split(' Device')[0].split(' ')[1] 
      @device = line.split(': ID')[0].split(' Device ')[1] 
    end 
    if line.match(serial) 
      return 
    end 
  end 
  @bus = "null" 
  @device = "null" 
end 

serial = ARGV[0] 
info = `lsusb -v` 
get_port_from_serial(serial, info) 
puts "#{@bus}/#{@device}"