rake task to install and run mongodb

gistfile1.rb

desc "Runs mongodb"
task :mongodb => %w{mongodb:install mongodb:run}
namespace :mongodb do
  task :install do
    next if File.exist?("vendor/mongodb/1.4.0")

    if RUBY_PLATFORM =~ /darwin/ # OSX
      system <<-bash
        mkdir -p #{Rails.root}/vendor/mongodb/data
        curl http://downloads.mongodb.org/osx/mongodb-osx-x86_64-1.4.0.tgz -o /tmp/mongodb.tgz
        tar -C #{Rails.root}/vendor/mongodb -xvzf /tmp/mongodb.tgz
        mv vendor/mongodb/mongodb-osx-x86_64-1.4.0 #{Rails.root}/vendor/mongodb/1.4.0
      bash
    elsif RUBY_PLATFORM =~ /linux/ # Linux
      system <<-bash
        mkdir -p #{Rails.root}/vendor/mongodb/data
        curl http://downloads.mongodb.org/osx/mongodb-linux-i686-1.4.0.tgz -o /tmp/mongodb.tgz
        tar -C #{Rails.root}/vendor/mongodb -xvzf /tmp/mongodb.tgz
        mv vendor/mongodb/mongodb-linux-i686-1.4.0 #{Rails.root}/vendor/mongodb/1.4.0
      bash
    else
      puts "OSX (Snow Leopard) or Linux only"
      next
    end
  end

  task :run do
    if File.exists?("/tmp/mongodb.dtach")
      system "dtach -a /tmp/mongodb.dtach"
    else
      system "dtach -n /tmp/mongodb.dtach #{Rails.root}/vendor/mongodb/1.4.0/bin/mongod --dbpath #{Rails.root}/vendor/mongodb/data"
    end
  end
end