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Credit Where It's Due
---------------------

This is a re-invention of Ben Hoskings's excellent
[Babushka](https://github.com/benhoskings/babushka).

There are a bunch of things I love about Babushka, and a bunch of other things
that really don't fit with the way we want to use it at
[Envato](http://envato.com/). Tango is an experiment in changing around a few
of Babushka's fundamentals to try to find a better fit.

Bootstrapping Ubuntu
--------------------

sudo apt-get install -y ruby irb rdoc

# Use the real rubygems, not the silly apt version. 
    wget http://production.cf.rubygems.org/rubygems/rubygems-1.6.2.tgz
    tar -zxvf rubygems-1.6.2.tgz
    cd rubygems-1.6.2
    sudo ruby setup.rb --no-format-executable

sudo gem install tango

Example Runner
--------------

require 'tango'

class AptInstaller < Tango::Runner
      def installed?(package)
        shell("dpkg-query", "--status", package, :echo => false).output !~ /not.installed|deinstall/
      end

step :install do |package|
        met? { installed?(package) }
        meet { shell!("apt-get", "install", "-y", package) }
      end
    end

class GemInstaller < Tango::Runner
      def installed?(gem)
        shell("gem", "query", "--installed", "--name-matches", gem, :echo => false).output =~ /true/
      end

step :install do |gem|
        met? { installed?(gem) }
        meet { shell!("gem", "install", gem) }
      end
    end

class ExampleInstaller < Tango::Runner
      def initialize
        @apt = AptInstaller.new
        @gem = GemInstaller.new
      end

step :install do
        @apt.install "build-essential"

@apt.install "mysql-server"
        @apt.install "libmysqlclient-dev"

@apt.install "git-core"

@gem.install "bundler"
      end
    end

Running the Example
-------------------

The normal way to do this is to use Rake as a front-end for Tango, so have a Rakefile like this:

require 'example_installer'

desc "Install MySQL, Git, and bundler."
    task :example_install do
      ExampleInstaller.new.install
    end

And then run:

rake example_install

Useful Helper Methods
---------------------

### Running Shell Commands

step :install_something do
      result = shell("apt-get", "install", "something")
      if result.succeeded?
        write("/tmp/something-install.log", result.output)
      end
    end

Use shell! to raise an exception if the command exits with non-zero status.

### Writing Config Files

step :configure_foo do
      @log_directory = "/var/log/foo.log"
      write "/etc/foo.conf", <<-EOF
        # Config file for foo
        log_file <%= @log_file %>
      end
    end

### Fetching a Remote URL

step :install do
      cd "/tmp" do
        fetch "http://example.com/something.tar.gz"
      end
    end

Chainable Helper Methods
------------------------

You can use these together like this:

in_directory("/tmp").with_umask(0022) do
      ...
    end

### Changing the Working Directory

step :migrate do
      in_directory "/rails_apps/blog" do
        shell "rake db:migrate"
      end
    end

### Changing the Umask

step :install do
      with_umask 0077 do
        shell "make install"
      end
    end

### Running As Another User

step :install do
      as_user "fred" do
        FileUtils.touch("/home/fred/fred_woz_ere")
      end
    end

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