require 'rbconfig' require 'rubygems' require 'rubygems/specification' require 'fileutils' ruby = File.join(ENV["ruby"], "bin", RbConfig::CONFIG['ruby_install_name']) out = ENV["out"] bin_path = File.join(ENV["out"], "bin") gem_home = ENV["GEM_HOME"] gem_path = ENV["GEM_PATH"].split(":") install_path = Dir.glob("#{gem_home}/gems/*").first gemspec_path = ARGV[0] if defined?(Encoding.default_internal) Encoding.default_internal = Encoding::UTF_8 Encoding.default_external = Encoding::UTF_8 end gemspec_content = File.read(gemspec_path) spec = nil if gemspec_content[0..2] == "---" # YAML header spec = Gem::Specification.from_yaml(gemspec_content) else spec = Gem::Specification.load(gemspec_path) end FileUtils.mkdir_p("#{out}/nix-support") # write meta-data meta = "#{out}/nix-support/gem-meta" FileUtils.mkdir_p(meta) FileUtils.ln_s(gemspec_path, "#{meta}/spec") File.open("#{meta}/name", "w") do |f| f.write(spec.name) end File.open("#{meta}/install-path", "w") do |f| f.write(install_path) end File.open("#{meta}/require-paths", "w") do |f| f.write(spec.require_paths.join(" ")) end File.open("#{meta}/executables", "w") do |f| f.write(spec.executables.join(" ")) end # add this gem to the GEM_PATH for dependencies File.open("#{out}/nix-support/setup-hook", "a") do |f| f.puts("addToSearchPath GEM_PATH #{gem_home}") spec.require_paths.each do |dir| f.puts("addToSearchPath RUBYLIB #{install_path}/#{dir}") end end # create regular rubygems binstubs FileUtils.mkdir_p(bin_path) spec.executables.each do |exe| File.open("#{bin_path}/#{exe}", "w") do |f| f.write(<<-EOF) #!#{ruby} # # This file was generated by Nix. # # The application '#{exe}' is installed as part of a gem, and # this file is here to facilitate running it. # Gem.use_paths "#{gem_home}", #{gem_path.to_s} require 'rubygems' load Gem.bin_path(#{spec.name.inspect}, #{exe.inspect}) EOF end FileUtils.chmod("+x", "#{bin_path}/#{exe}") end