puppetlabs-stdlib/lib/puppet/parser/functions/ensure_packages.rb

#
# ensure_packages.rb
#

module Puppet::Parser::Functions
  newfunction(:ensure_packages, :type => :statement, :doc => <<-EOS
Takes a list of packages and only installs them if they don't already exist.
It optionally takes a hash as a second parameter that will be passed as the
third argument to the ensure_resource() function.
    EOS
  ) do |arguments|

    if arguments.size > 2 or arguments.size == 0
      raise(Puppet::ParseError, "ensure_packages(): Wrong number of arguments " +
        "given (#{arguments.size} for 1 or 2)")
    elsif arguments.size == 2 and !arguments[1].is_a?(Hash) 
      raise(Puppet::ParseError, 'ensure_packages(): Requires second argument to be a Hash')
    end

    if arguments[0].is_a?(Hash)
      if arguments[1]
        defaults = { 'ensure' => 'present' }.merge(arguments[1])
      else
        defaults = { 'ensure' => 'present' }
      end

      Puppet::Parser::Functions.function(:ensure_resources)
      function_ensure_resources(['package', Hash(arguments[0]), defaults ])
    else
      packages = Array(arguments[0])

      if arguments[1]
        defaults = { 'ensure' => 'present' }.merge(arguments[1])
      else
        defaults = { 'ensure' => 'present' }
      end

      Puppet::Parser::Functions.function(:ensure_resource)
      packages.each { |package_name|
        function_ensure_resource(['package', package_name, defaults ])
    }
    end
  end
end

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