source 'https://rubygems.org' gemspec logstash_path = ENV['LOGSTASH_PATH'] || '../../logstash' use_logstash_source = ENV['LOGSTASH_SOURCE'] && ENV['LOGSTASH_SOURCE'].to_s == '1' if Dir.exist?(logstash_path) && use_logstash_source gem 'logstash-core', :path => "#{logstash_path}/logstash-core" gem 'logstash-core-plugin-api', :path => "#{logstash_path}/logstash-core-plugin-api" end