Manage Ruby Gems from puppet

ruby.pp

class packages::ruby {
	package{
	['ruby','rubygems','ruby-dev']:
		ensure => present;
	}
}

define rubygem(    
    $version = ""
) {
    include packages::ruby

    $version_flag = $version ? {
       ""      => ">= 0",
       default => "--version '$version'"
    }

    exec {
    "gem install $name":
        cwd       => "/root",
        require   => Package['rubygems'],
        unless    => "ruby -rubygems -e 'gem \"$name\", \"$version\"'",
        command   => "gem install $name --no-ri --no-rdoc --verbose",
        user      => "root",
        logoutput => on_failure,
    }
}