lxc-config/hooks/cleanup-lxc-config

#!/usr/bin/env ruby
require_relative "lib/lxc"

registry = Lxc::Registry.new
containers = `lxc-ls -1`.split(/\n/)

modified = false
network = registry.data["network"] || {}
network.each do |host, value|
  unless containers.include?(host) or value["lxc"] == false
    network.delete(host)
    modified = true
  end
end

if modified
  registry.save
else
  puts "Unchanged"
end