File build_clean.rb of Package rubygem-libv8

#!/usr/bin/env ruby

require 'rbconfig'
require 'fileutils'

NAME="libv8"
VERSION="8.4.255.0"
BUILDROOT=ENV['RPM_BUILD_ROOT']
LIBDIR=RbConfig::CONFIG['libdir']
MODULE_NAME=NAME + "-" + VERSION

Dir.glob(BUILDROOT + LIBDIR + "/ruby/gems/*") do |gem_base|
  module_dir = gem_base + "/gems/" + MODULE_NAME
  # clean /usr/lib(64)/ruby/2.[0-3].[0-9]/gems/libv8-*/cache/*.gem,
  # which is too big (300+ MB) after v8 source was added.
  cached = gem_base + "/cache/" + MODULE_NAME + ".gem"
  FileUtils.rm_rf cached
  FileUtils.touch cached
  # just keep the needed stuff
  FileUtils.mv module_dir + "/vendor/v8/include", File.expand_path(module_dir + "/../v8_include")
  FileUtils.mv module_dir + "/vendor/v8/out.gn/libv8/obj", File.expand_path(module_dir + "/../v8_out")
  Dir.glob(File.expand_path(module_dir + "/../v8_out") + "/**/{*,.*}") do |f|
    unless f.end_with?(".a")
      FileUtils.rm_rf f
    end
  end 
  FileUtils.mv module_dir + "/ext", File.expand_path(module_dir + "/../ext")
  FileUtils.mv module_dir + "/lib", File.expand_path(module_dir + "/../lib")
  FileUtils.mv module_dir + "/spec", File.expand_path(module_dir + "/../spec")
  FileUtils.mv module_dir + "/README.md", File.expand_path(module_dir + "/../README.md")
  FileUtils.mv module_dir + "/CHANGELOG.md", File.expand_path(module_dir + "/../CHANGELOG.md")
  # move back everything
  FileUtils.rm_rf module_dir
  FileUtils.mkdir_p module_dir + "/vendor/v8/out.gn/libv8"
  FileUtils.mv File.expand_path(module_dir + "/../v8_include"), module_dir + "/vendor/v8/include"
  FileUtils.mv File.expand_path(module_dir + "/../v8_out"), module_dir + "/vendor/v8/out.gn/libv8/obj"
  FileUtils.mv File.expand_path(module_dir + "/../ext"), module_dir + "/ext"
  FileUtils.mv File.expand_path(module_dir + "/../lib"), module_dir + "/lib"
  FileUtils.mv File.expand_path(module_dir + "/../spec"), module_dir + "/spec"
  FileUtils.mv File.expand_path(module_dir + "/../README.md"), module_dir + "/README.md"
  FileUtils.mv File.expand_path(module_dir + "/../CHANGELOG.md"), module_dir + "/CHANGELOG.md"
end