class Bundler::RubyGemsGemInstaller

def build_extensions
  extension_cache_path = options[:bundler_extension_cache_path]
  extension_dir = spec.extension_dir
  unless extension_cache_path && extension_dir
    prepare_extension_build(extension_dir)
    return super
  end
  build_complete = SharedHelpers.filesystem_access(extension_cache_path.join("gem.build_complete"), :read, &:file?)
  if build_complete && !options[:force]
    SharedHelpers.filesystem_access(File.dirname(extension_dir)) do |p|
      FileUtils.mkpath p
    end
    SharedHelpers.filesystem_access(extension_cache_path) do
      FileUtils.cp_r extension_cache_path, extension_dir
    end
  else
    prepare_extension_build(extension_dir)
    super
    SharedHelpers.filesystem_access(extension_cache_path.parent, &:mkpath)
    SharedHelpers.filesystem_access(extension_cache_path) do
      FileUtils.cp_r extension_dir, extension_cache_path
    end
  end
end

def check_executable_overwrite(filename)
  # Bundler needs to install gems regardless of binstub overwriting
end

def ensure_writable_dir(dir)
  super
rescue Gem::FilePermissionError
  # Ignore permission checks in RubyGems. Instead, go on, and try to write
  # for real. We properly handle permission errors when they happen.
  nil
end

def gem_checksum
  Checksum.from_gem_package(@package)
end

def generate_bin_script(filename, bindir)
  bin_script_path = File.join bindir, formatted_program_filename(filename)
  Gem.open_file_with_lock(bin_script_path) do
    require "fileutils"
    FileUtils.rm_f bin_script_path # prior install may have been --no-wrappers
    File.open(bin_script_path, "wb", 0o755) do |file|
      file.write app_script_text(filename)
      file.chmod(options[:prog_mode] || 0o755)
    end
  end
  verbose bin_script_path
  generate_windows_script filename, bindir
end

def generate_plugins
  return unless Gem::Installer.instance_methods(false).include?(:generate_plugins)
  latest = Gem::Specification.stubs_for(spec.name).first
  return if latest && latest.version > spec.version
  ensure_writable_dir @plugins_dir
  if spec.plugins.empty?
    remove_plugins_for(spec, @plugins_dir)
  else
    regenerate_plugins_for(spec, @plugins_dir)
  end
end

def install
  pre_install_checks
  run_pre_install_hooks
  spec.loaded_from = spec_file
  # Completely remove any previous gem files
  strict_rm_rf gem_dir
  strict_rm_rf spec.extension_dir
  SharedHelpers.filesystem_access(gem_dir, :create) do
    FileUtils.mkdir_p gem_dir, mode: 0o755
  end
  SharedHelpers.filesystem_access(gem_dir, :write) do
    extract_files
  end
  build_extensions if spec.extensions.any?
  write_build_info_file
  run_post_build_hooks
  SharedHelpers.filesystem_access(bin_dir, :write) do
    generate_bin
  end
  generate_plugins
  write_spec
  SharedHelpers.filesystem_access("#{gem_home}/cache", :write) do
    write_cache_file
  end
  say spec.post_install_message unless spec.post_install_message.nil?
  run_post_install_hooks
  spec
end

def pre_install_checks
  super
rescue Gem::FilePermissionError
  # Ignore permission checks in RubyGems. Instead, go on, and try to write
  # for real. We properly handle permission errors when they happen.
  nil
end

def prepare_extension_build(extension_dir)
  SharedHelpers.filesystem_access(extension_dir, :create) do
    FileUtils.mkdir_p extension_dir
  end
  require "shellwords" unless Bundler.rubygems.provides?(">= 3.2.25")
end

def spec
  if Bundler.rubygems.provides?("< 3.3.12") # RubyGems implementation rescues and re-raises errors before 3.3.12 and we don't want that
    @package.spec
  else
    super
  end
end

def strict_rm_rf(dir)
  return unless File.exist?(dir)
  return if Dir.empty?(dir)
  parent = File.dirname(dir)
  parent_st = File.stat(parent)
  if parent_st.world_writable? && !parent_st.sticky?
    raise InsecureInstallPathError.new(spec.full_name, dir)
  end
  begin
    FileUtils.remove_entry_secure(dir)
  rescue StandardError => e
    raise unless File.exist?(dir)
    raise DirectoryRemovalError.new(e, "Could not delete previous installation of `#{dir}`")
  end
end