open_jdk_like_jre.rb

# Cloud Foundry Java Buildpack
# Copyright 2013-2017 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

require 'fileutils'
require 'java_buildpack/component/versioned_dependency_component'
require 'java_buildpack/jre'
require 'java_buildpack/util/tokenized_version'

module JavaBuildpack
  module Jre

    # Encapsulates the detect, compile, and release functionality for selecting an OpenJDK-like JRE.
    class OpenJDKLikeJre < JavaBuildpack::Component::VersionedDependencyComponent

      # Creates an instance
      #
      # @param [Hash] context a collection of utilities used the component
      def initialize(context)
        @application    = context[:application]
        @component_name = context[:component_name]
        @configuration  = context[:configuration]
        @droplet        = context[:droplet]

        @droplet.java_home.root = @droplet.sandbox
      end

      # (see JavaBuildpack::Component::BaseComponent#detect)
      def detect
        @version, @uri             = JavaBuildpack::Repository::ConfiguredItem.find_item(@component_name,
                                                                                         @configuration)
        @droplet.java_home.version = @version
        super
      end

      # (see JavaBuildpack::Component::BaseComponent#compile)
      def compile
        download_tar
        @droplet.copy_resources

        return if @droplet.java_home.java_8_or_later?

        $stderr.puts "\n       WARNING: You are using #{@droplet.java_home.version}. Oracle has ended public " \
                     "updates of Java 1.7 as of April 2015, possibly rendering your application vulnerable.\n\n"
      end

      # (see JavaBuildpack::Component::BaseComponent#release)
      def release
        @droplet
          .java_opts
          .add_system_property('java.io.tmpdir', '$TMPDIR')
      end

    end

  end
end