phys_interfaces fact

phys_interfaces.rb

# phys_interfaces returns network interfaces associated with a physical device
# as a comma separated list.
#
# Written by kjetil.homme@redpill-linpro.com 2016
# Released into the public domain

require 'facter'

Facter.add("phys_interfaces") do
  confine :kernel => :linux
  setcode do
    Dir.glob('/sys/class/net/*/device').map { |p|
      p.split('/')[4]
    }.join(',')
  end
end