Generates facts to identify the interface a mac address is associated with

macaddresses.rb

# Fact:
#   macaddresses to interfaces
#
# Purpose:
#   Make a fact to detail the interfaces for a normalized mac address
#
# Caveats:
#   Only tested on linux, deals with 802.3ad bonded links, but I have not
#   tested other kinds of interfaces
#
require 'facter/util/macaddress'

# Delete lo interface, as it doesn't have a mac
Facter::Util::IP.get_interfaces.delete_if {|interface| interface == 'lo' || interface =~ /sit\d+/ }.each do |interface|
    # if we don't have a hardware address, skip
    hwaddr = Facter::Util::IP.get_interface_value(interface, 'macaddress')
    if hwaddr == nil
        next
    end

    # If the device has a master, skip it
    if Facter::Util::IP.get_bonding_master(interface) == nil
        # mac_AA_BB_CC... => eth0
        label = "mac_" + hwaddr.gsub(/:/,'_').downcase                                                                           
        Facter.add(label) do
            setcode do
                interface
            end
        end
    end 
end