Shef - chef in irb

gistfile1.txt

$ bin/shef 
Loading Node Data
Ohai2u!
chef > recipe
 => :recipe 
chef:recipe > file "/tmp/foo"
 => #<Chef::Resource::File:0x1c3cd2c @provider=nil, @not_if=nil, @params={}, @recipe_name=nil, @action="create", @source_line="/Users/danielsdeleo/ruby/shef/(irb) line 2", @actions={}, @ignore_failure=false, @name="/tmp/foo", @cookbook_name=nil, @enclosing_provider=nil, @resource_name=:file, @before=nil, @supports={}, @backup=5, @allowed_actions=[:nothing, :create, :delete, :touch, :create_if_missing], @path="/tmp/foo", @only_if=nil, @noop=nil, @updated=false, @node=eigenstate.local, @collection=#<Chef::ResourceCollection:0x1c4f328 @insert_after_idx=nil, @resources=[#<Chef::Resource::File:0x1c3cd2c ...>], @resources_by_name={"file[/tmp/foo]"=>0}>> 
chef:recipe > run_chef
[Tue, 03 Nov 2009 22:16:27 -0700] DEBUG: Processing file[/tmp/foo]
[Tue, 03 Nov 2009 22:16:27 -0700] DEBUG: file[/tmp/foo] using Chef::Provider::File
[Tue, 03 Nov 2009 22:16:27 -0700] INFO: Creating file[/tmp/foo] at /tmp/foo
 => 1 
chef:recipe > file "/tmp/bar"
 => #<Chef::Resource::File:0x1c37a5c @provider=nil, @not_if=nil, @params={}, @recipe_name=nil, @action="create", @source_line="/Users/danielsdeleo/ruby/shef/(irb) line 4", @actions={}, @ignore_failure=false, @name="/tmp/bar", @cookbook_name=nil, @enclosing_provider=nil, @resource_name=:file, @before=nil, @supports={}, @backup=5, @allowed_actions=[:nothing, :create, :delete, :touch, :create_if_missing], @path="/tmp/bar", @only_if=nil, @noop=nil, @updated=false, @node=eigenstate.local, @collection=#<Chef::ResourceCollection:0x1c4f328 @insert_after_idx=1, @resources=[#<Chef::Resource::File:0x1c3cd2c @provider=nil, @not_if=nil, @params={}, @recipe_name=nil, @action="create", @source_line="/Users/danielsdeleo/ruby/shef/(irb) line 2", @actions={}, @ignore_failure=false, @name="/tmp/foo", @cookbook_name=nil, @enclosing_provider=nil, @resource_name=:file, @before=nil, @supports={}, @backup=5, @allowed_actions=[:nothing, :create, :delete, :touch, :create_if_missing], @path="/tmp/foo", @only_if=nil, @noop=nil, @updated=true, @node=eigenstate.local, @collection=#<Chef::ResourceCollection:0x1c4f328 ...>>, #<Chef::Resource::File:0x1c37a5c ...>], @resources_by_name={"file[/tmp/foo]"=>0, "file[/tmp/bar]"=>1}>> 
chef:recipe > run_chef
[Tue, 03 Nov 2009 22:16:47 -0700] DEBUG: Processing file[/tmp/foo]
[Tue, 03 Nov 2009 22:16:47 -0700] DEBUG: file[/tmp/foo] using Chef::Provider::File
[Tue, 03 Nov 2009 22:16:48 -0700] DEBUG: Processing file[/tmp/bar]
[Tue, 03 Nov 2009 22:16:48 -0700] DEBUG: file[/tmp/bar] using Chef::Provider::File
[Tue, 03 Nov 2009 22:16:48 -0700] INFO: Creating file[/tmp/bar] at /tmp/bar
 => 1 
chef:recipe > 

shef.rb

# Launch this from an executable file containing:
#
#   #!/usr/bin/env ruby
#   exec "irb -r irb/completion -r lib/shef"
#   

require "singleton"
require "pp"
require "rubygems"
require "chef"
require "chef/client"
 
module Shef

  class IRBContext < Hash
    include Singleton
    
    def initialize
      reset!
    end
    
    def reset!
      puts "Loading Node Data"
      self[:client] = Chef::Client.new
      self[:client].build_node('localhost', true)

      node = self[:node] = self[:client].node
      def node.inspect(verbose=false)
        if verbose
          super()
        else
          "<Chef::Node:0x#{self.object_id.to_s(16)} @name=\"#{self.name}\">"
        end
      end
      self[:recipe] = Chef::Recipe.new(nil, nil, self[:node])
    end
 
  end
 
  module IRBExtension
 
    def select_subsession(context_type)
      unless jobs.respond_to?(:select_shef)
        def jobs.select_shef(context_type)
          Array(@jobs.select { |job| job[1].context.main.kind_of?(context_type)}.first)[1]
        end
      end
      jobs.select_shef(context_type)
    end

    def shef_context
      IRBContext.instance
    end

    def self.echo_mode=(on_off)
      @echo_mode = on_off
    end

    def self.echo_mode
      @echo_mode = true if @echo_mode.nil?
      @echo_mode 
    end

    def self.desc(text)
      @desc = text
    end

    def self.method_added(mname)
      if @desc
        help_text[mname.to_s] = @desc.to_s
        @desc = nil
      end
    end

    def self.help_text
      @help_text ||= {}
    end
    
    desc "prints this help message"
    def shef_help
      puts "Shef Help"
      puts "".ljust(80, "=")
      puts "| " + "Command".ljust(20) + "| " + "Description"
      puts "".ljust(80, "=")
      ::Shef::IRBExtension.help_text.each do |cmd, description|
        puts "| " + cmd.ljust(20) + "| " + description
      end
      puts "".ljust(80, "=")
      :youcanhaz_helpz
    end

    desc "switch to recipe mode"
    def recipe
      if subsession = select_subsession(::Chef::Recipe)
        jobs.switch(subsession)
      else
        irb(shef_context[:recipe])
      end
      :recipe
    end
   
    desc "switch to attributes mode"
    def attributes
      if subsession = select_subsession(::Chef::Node)
        jobs.switch(subsession)
      else
        irb(shef_context[:node])
      end
      :attributes
    end

    desc "turn tracing on or off"
    def trace(on_off=nil)
      return trace? if on_off.nil?
      on_off = true if on_off.to_s == "on"
      on_off = false if on_off.to_s == "off"
      puts "This is going to be verbose..." if on_off
      conf.use_tracer = on_off
      trace?
    end
    alias :tracing :trace

    desc "show whether tracing is on or off"
    def trace?
      puts begin
        "tracing = #{conf.use_tracer ? "on" : "off"}"
      rescue NoMethodError
        "tracing = off"
      end
    end
    alias :tracing? :trace?

    desc "turn console echo/object inspection on/off"
    def echo(on_off=nil)
      return echo? if on_off.nil?
      on_off = true if on_off.to_s == "on"
      on_off = false if on_off.to_s == "off"
      IRBExtension.echo_mode = on_off
      conf.echo = on_off
      echo?
    end

    desc "show if console echo is on or off"
    def echo?
      "echo = #{conf.echo ? "on" : "off"}"
    end

    desc "the current node, i.e. this host"
    def node
      shef_context[:node]
    end

    desc "pretty print the node's attributes"
    def ohai
      pp node.attribute
    end

    desc "run chef with the configured recipe"
    def run_chef
      Chef::Log.level(:debug)
      runrun = Chef::Runner.new(node, shef_context[:recipe].collection).converge
      Chef::Log.level(:info)
    end
 
    desc "reset the session with a blank recipe and reload node data"
    def reset
      shef_context.reset!
      jobs.switch(select_subsession(Object))
      :reset
    end

    desc "pretty print the resources for the current recipe"
    def resources
      pp shef_context[:recipe].collection.instance_variable_get(:@resources_by_name).keys
    end
 
  end
 
end

Shef::IRBContext.instance
Shef::GREETING = begin
                  " #{Etc.getlogin}@#{Shef::IRBContext.instance[:node].name}"
                 rescue NameError
                   ""
                 end

Object.send(:include, Shef::IRBExtension)

IRB.conf[:HISTORY_FILE] = "~/.shef_history"
IRB.conf[:SAVE_HISTORY] = 1000

IRB.conf[:PROMPT][:CHEF]      = { :PROMPT_C     =>  "chef > ", 
                                  :AUTO_INDENT  =>  true, 
                                  :RETURN       =>  " => %s \n", 
                                  :PROMPT_I     =>  "chef > ", 
                                  :PROMPT_N     =>  "chef ?> ", 
                                  :PROMPT_S     =>  "chef%l> "}
IRB.conf[:PROMPT_MODE] = :CHEF

IRB.conf[:IRB_RC] = lambda do |conf|
  m = conf.main
  leader =  case m
            when Chef::Recipe
              ":recipe"
            when Chef::Node
              ":attributes"
            else
              ""
            end
  
  def m.help
    shef_help
  end

  conf.echo = Shef::IRBExtension.echo_mode

  conf.prompt_c       = "chef#{leader} > "
  conf.return_format  = " => %s \n"
  conf.prompt_i       = "chef#{leader} > "
  conf.prompt_n       = "chef#{leader} ?> "
  conf.prompt_s       = "chef#{leader}%l> "
end

puts "Ohai2u#{Shef::GREETING}!"