cooto.rb

#!/usr/bin/env ruby

# Use dot separated pathspec:
# ./cooto.rb mysql.datadir
# /var/lib/mysql

require 'rubygems'
require 'chef/client'
require 'ohai'

Chef::Config.from_file("/etc/chef/client.rb")
Chef::Log.level :info

ohai = Ohai::System.new()
ohai.all_plugins

node_name ||= ohai[:fqdn] ? ohai[:fqdn] : ohai[:hostname]
Chef::Config[:node_name] = node_name

c = Chef::Client.new()
c.build_node
current_node = c.node
current_path = []
ARGV[0].split(".").each do |k|
  if current_node.has_key?(k)
    current_path <<  k
    current_node = current_node[k]
  else
    puts "Missing key #{k} in #{current_path.join(".")}. Available keys are:"
    puts current_node.keys.sort.join("\n")
    exit(-1)
  end
end
current_node.each do |k,v|
  if k==nil && v!=nil
    puts v
  elsif k!=nil && v==nil
    puts k
  elsif k!=nil && v!=nil
    puts "#{k}\t#{v}"
  end
end