adamhjk

ruby_block "foo" do
  block do 
    node[:some][:value] = 'is awesome' 
  end
  action :nothing
  run_action :create
end

adamhjk

node.save if node.run_list.roles.include?('mysql_master')
sleep 5 # just in case the queue takes a while

search(:node, 'role:mysql_master') do |foo|
...
end

adamhjk

{
  "id": "0123456789abcdef",
  "name": "myname",
  "provider": "puppet",
  "os": {
    "name": "linux",
    "version": "2.6.35-22-generic",
    "vendor": "ubuntu",
    "vendor_version": "10.10"
  },

adamhjk

case node[:hostname]
when "foo"
  node[:cron][:backup][:hour] = 10
when "bar"
  node[:cron][:backup][:hour] = 11
end

adamhjk

require 'chef'
require 'chef/node'

class Opscode
  class Backup
    attr_accessor :backup_dir

    def initialize(backup_dir, config_file)
      @backup_dir = backup_dir
      Chef::Config.from_file(config_file)

adamhjk

      def action_create
        if @current_resource.to != ::File.expand_path(@new_resource.to, @new_resource.target_file)
          noop "Creating a #{@new_resource.link_type} link from #{@new_resource.to} -> #{@new_resource.target_file} for #{@new_resource}" do
            if @new_resource.link_type == :symbolic
              unless (::File.symlink?(@new_resource.target_file) && ::File.readlink(@new_resource.target_file) == @new_resource.to)
                if ::File.symlink?(@new_resource.target_file) || ::File.exist?(@new_resource.target_file)
                  ::File.unlink(@new_resource.target_file)
                end
                ::File.symlink(@new_resource.to,@new_resource.target_file)
            end

adamhjk

node['filesystem']['/dev/disk0s2']['percent_used'] =~ /^(\d+)%$/
percent_used = $1.to_i
if percent_used > 90
  include_recipe "raid::grow"
end

adamhjk

#!/usr/bin/env ruby

require 'rubygems'
require 'chef'
require 'chef/client'
require 'chef/run_context'

Chef::Config[:solo] = true
Chef::Config[:log_level] = :info
Chef::Log.level(:info)

adamhjk

#!/usr/bin/env ruby

require 'rubygems'
require 'chef'
require 'chef/client'
require 'chef/run_context'

Chef::Config[:solo] = true
Chef::Config[:log_level] = :info
Chef::Log.level(:info)

adamhjk

Prototype mysql_grant provider for Chef
---------------------------------------

Drop the two files into your mysql cookbook, and experiment with the following examples:

mysql_grant "kenneth" do
  action :grant
  username "root" # <- User with admin privs
  password node[:mysql][:server_root_password]
  # Actual grant details