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