Contents

require 'wright/provider'

module Wright
  class Provider
    # Package provider. Used as a base class for Resource::Package
    # providers.
    class Package < Wright::Provider
      # Installs the package.
      #
      # @return [void]
      def install
        package = @resource.name
        unless_uptodate(:install, "package already installed: '#{package}'") do
          unless_dry_run("install package: '#{package}'") do
            install_package
          end
        end
      end

      # Removes the package.
      #
      # @return [void]
      def remove
        package = @resource.name
        unless_uptodate(:remove, "package already removed: '#{package}'") do
          unless_dry_run("remove package: '#{package}'") do
            remove_package
          end
        end
      end

      # @return [Array<String>] the installed package versions
      def installed_versions
        fail NotImplementedError
      end

      private

      # @api public
      # Checks if the package is up-to-date for a given action.
      #
      # @param action [Symbol] the action. Currently supports
      #   +:install+ and +:remove+.
      #
      # @return [Bool] +true+ if the package is up-to-date and +false+
      #   otherwise
      # @raise [ArgumentError] if the action is invalid
      def uptodate?(action)
        case action
        when :install
          package_installed?
        when :remove
          !package_installed?
        else
          fail ArgumentError, "invalid action '#{action}'"
        end
      end

      def package_installed?
        if @resource.version
          installed_versions.include?(@resource.version)
        else
          !installed_versions.empty?
        end
      end

      def install_package
        fail NotImplementedError
      end

      def remove_package
        fail NotImplementedError
      end
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
wright-0.3.2	lib/wright/provider/package.rb
wright-0.3.1	lib/wright/provider/package.rb
wright-0.3.0	lib/wright/provider/package.rb