yum.rb

  def install
    should = @resource.should(:ensure)
    self.debug "Ensuring => #{should}"
    wanted = @resource[:name]
    operation = :install

    case should
    when true, false, Symbol
      # pass
      should = nil
    else
      # Add the package version
      wanted += "-#{should}"
      is = self.query
      if is && Puppet::Util::Package.versioncmp(should, is[:ensure]) < 0
        self.debug "Downgrading package #{@resource[:name]} from version #{is[:ensure]} to #{should}"
        operation = :downgrade
      end
    end

    output = yum "-d", "0", "-e", "0", "-y", operation, wanted

    is = self.query
    raise Puppet::Error, "Could not find package #{self.name}" unless is

    # FIXME: Should we raise an exception even if should == :latest
    # and yum updated us to a version other than @param_hash[:ensure] ?
    raise Puppet::Error, "Failed to update to version #{should}, got version #{is[:ensure]} instead" if should && should != is[:ensure]
  end