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Edit File : installer.rb \| Size : 26.76 KB
# frozen_string_literal: true #-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ require_relative "installer_uninstaller_utils" require_relative "exceptions" require_relative "deprecate" require_relative "package" require_relative "ext" require_relative "user_interaction" ## # The installer installs the files contained in the .gem into the Gem.home. # # Gem::Installer does the work of putting files in all the right places on the # filesystem including unpacking the gem into its gem dir, installing the # gemspec in the specifications dir, storing the cached gem in the cache dir, # and installing either wrappers or symlinks for executables. # # The installer invokes pre and post install hooks. Hooks can be added either # through a rubygems_plugin.rb file in an installed gem or via a # rubygems/defaults/#{RUBY_ENGINE}.rb or rubygems/defaults/operating_system.rb # file. See Gem.pre_install and Gem.post_install for details. class Gem::Installer extend Gem::Deprecate ## # Paths where env(1) might live. Some systems are broken and have it in # /bin ENV_PATHS = %w[/usr/bin/env /bin/env].freeze ## # Deprecated in favor of Gem::Ext::BuildError ExtensionBuildError = Gem::Ext::BuildError # :nodoc: include Gem::UserInteraction include Gem::InstallerUninstallerUtils ## # The directory a gem's executables will be installed into attr_reader :bin_dir attr_reader :build_root # :nodoc: ## # The gem repository the gem will be installed into attr_reader :gem_home ## # The options passed when the Gem::Installer was instantiated. attr_reader :options ## # The gem package instance. attr_reader :package @path_warning = false class << self # # Changes in rubygems to lazily loading `rubygems/command` (in order to # lazily load `optparse` as a side effect) affect bundler's custom installer # which uses `Gem::Command` without requiring it (up until bundler 2.2.29). # This hook is to compensate for that missing require. # # TODO: Remove when rubygems no longer supports running on bundler older # than 2.2.29. def inherited(klass) if klass.name == "Bundler::RubyGemsGemInstaller" require "rubygems/command" end super(klass) end ## # True if we've warned about PATH not including Gem.bindir attr_accessor :path_warning ## # Overrides the executable format. # # This is a sprintf format with a "%s" which will be replaced with the # executable name. It is based off the ruby executable name's difference # from "ruby". attr_writer :exec_format # Defaults to use Ruby's program prefix and suffix. def exec_format @exec_format \|\|= Gem.default_exec_format end end ## # Construct an installer object for the gem file located at +path+ def self.at(path, options = {}) security_policy = options[:security_policy] package = Gem::Package.new path, security_policy new package, options end class FakePackage attr_accessor :spec attr_accessor :dir_mode attr_accessor :prog_mode attr_accessor :data_mode def initialize(spec) @spec = spec end def extract_files(destination_dir, pattern = "") FileUtils.mkdir_p destination_dir spec.files.each do \|file\| file = File.join destination_dir, file next if File.exist? file FileUtils.mkdir_p File.dirname(file) File.open file, "w" do \|fp\| fp.puts "# #{file}" end end end def copy_to(path) end end ## # Construct an installer object for an ephemeral gem (one where we don't # actually have a .gem file, just a spec) def self.for_spec(spec, options = {}) # FIXME: we should have a real Package class for this new FakePackage.new(spec), options end ## # Constructs an Installer instance that will install the gem at +package+ which # can either be a path or an instance of Gem::Package. +options+ is a Hash # with the following keys: # # :bin_dir:: Where to put a bin wrapper if needed. # :development:: Whether or not development dependencies should be installed. # :env_shebang:: Use /usr/bin/env in bin wrappers. # :force:: Overrides all version checks and security policy checks, except # for a signed-gems-only policy. # :format_executable:: Format the executable the same as the Ruby executable. # If your Ruby is ruby18, foo_exec will be installed as # foo_exec18. # :ignore_dependencies:: Don't raise if a dependency is missing. # :install_dir:: The directory to install the gem into. # :security_policy:: Use the specified security policy. See Gem::Security # :user_install:: Indicate that the gem should be unpacked into the users # personal gem directory. # :only_install_dir:: Only validate dependencies against what is in the # install_dir # :wrappers:: Install wrappers if true, symlinks if false. # :build_args:: An Array of arguments to pass to the extension builder # process. If not set, then Gem::Command.build_args is used # :post_install_message:: Print gem post install message if true def initialize(package, options={}) require "fileutils" @options = options @package = package process_options @package.dir_mode = options[:dir_mode] @package.prog_mode = options[:prog_mode] @package.data_mode = options[:data_mode] if options[:user_install] @gem_home = Gem.user_dir @bin_dir = Gem.bindir gem_home unless options[:bin_dir] @plugins_dir = Gem.plugindir(gem_home) check_that_user_bin_dir_is_in_path end end ## # Checks if +filename+ exists in +@bin_dir+. # # If +@force+ is set +filename+ is overwritten. # # If +filename+ exists and it is a RubyGems wrapper for a different gem, then # the user is consulted. # # If +filename+ exists and +@bin_dir+ is Gem.default_bindir (/usr/local) the # user is consulted. # # Otherwise +filename+ is overwritten. def check_executable_overwrite(filename) # :nodoc: return if @force generated_bin = File.join @bin_dir, formatted_program_filename(filename) return unless File.exist? generated_bin ruby_executable = false existing = nil File.open generated_bin, "rb" do \|io\| line = io.gets shebang = /^#!.ruby/ if load_relative_enabled? until line.nil? \|\| line =~ shebang do line = io.gets end end next unless line =~ shebang io.gets # blankline # TODO detect a specially formatted comment instead of trying # to run a regexp against Ruby code. next unless io.gets =~ /This file was generated by RubyGems/ ruby_executable = true existing = io.read.slice(%r{ ^\s( gem \s \| load \s Gem\.bin_path\( \| load \s Gem\.activate_bin_path\( ) (['"])(.?)(\2), }x, 3) end return if spec.name == existing # somebody has written to RubyGems' directory, overwrite, too bad return if Gem.default_bindir != @bin_dir && !ruby_executable question = "#{spec.name}'s executable \"#{filename}\" conflicts with ".dup if ruby_executable question << (existing \|\| "an unknown executable") return if ask_yes_no "#{question}\nOverwrite the executable?", false conflict = "installed executable from #{existing}" else question << generated_bin return if ask_yes_no "#{question}\nOverwrite the executable?", false conflict = generated_bin end raise Gem::InstallError, "\"#{filename}\" from #{spec.name} conflicts with #{conflict}" end ## # Lazy accessor for the spec's gem directory. def gem_dir @gem_dir \|\|= File.join(gem_home, "gems", spec.full_name) end ## # Lazy accessor for the installer's spec. def spec @package.spec end ## # Installs the gem and returns a loaded Gem::Specification for the installed # gem. # # The gem will be installed with the following structure: # # @gem_home/ # cache/<gem-version>.gem #=> a cached copy of the installed gem # gems/<gem-version>/... #=> extracted files # specifications/<gem-version>.gemspec #=> the Gem::Specification def install pre_install_checks run_pre_install_hooks # Set loaded_from to ensure extension_dir is correct if @options[:install_as_default] spec.loaded_from = default_spec_file else spec.loaded_from = spec_file end # Completely remove any previous gem files FileUtils.rm_rf gem_dir FileUtils.rm_rf spec.extension_dir dir_mode = options[:dir_mode] FileUtils.mkdir_p gem_dir, :mode => dir_mode && 0755 if @options[:install_as_default] extract_bin write_default_spec else extract_files build_extensions write_build_info_file run_post_build_hooks end generate_bin generate_plugins unless @options[:install_as_default] write_spec write_cache_file end File.chmod(dir_mode, gem_dir) if dir_mode say spec.post_install_message if options[:post_install_message] && !spec.post_install_message.nil? Gem::Specification.add_spec(spec) run_post_install_hooks spec # TODO This rescue is in the wrong place. What is raising this exception? # move this rescue to around the code that actually might raise it. rescue Zlib::GzipFile::Error raise Gem::InstallError, "gzip error installing #{gem}" end def run_pre_install_hooks # :nodoc: Gem.pre_install_hooks.each do \|hook\| if hook.call(self) == false location = " at #{$1}" if hook.inspect =~ /[ @](.:\d+)/ message = "pre-install hook#{location} failed for #{spec.full_name}" raise Gem::InstallError, message end end end def run_post_build_hooks # :nodoc: Gem.post_build_hooks.each do \|hook\| if hook.call(self) == false FileUtils.rm_rf gem_dir location = " at #{$1}" if hook.inspect =~ /[ @](.:\d+)/ message = "post-build hook#{location} failed for #{spec.full_name}" raise Gem::InstallError, message end end end def run_post_install_hooks # :nodoc: Gem.post_install_hooks.each do \|hook\| hook.call self end end ## # # Return an Array of Specifications contained within the gem_home # we'll be installing into. def installed_specs @specs \|\|= begin specs = [] Gem::Util.glob_files_in_dir(".gemspec", File.join(gem_home, "specifications")).each do \|path\| spec = Gem::Specification.load path.tap(&Gem::UNTAINT) specs << spec if spec end specs end end ## # Ensure that the dependency is satisfied by the current installation of # gem. If it is not an exception is raised. # # spec :: Gem::Specification # dependency :: Gem::Dependency def ensure_dependency(spec, dependency) unless installation_satisfies_dependency? dependency raise Gem::InstallError, "#{spec.name} requires #{dependency}" end true end ## # True if the gems in the system satisfy +dependency+. def installation_satisfies_dependency?(dependency) return true if @options[:development] && dependency.type == :development return true if installed_specs.detect {\|s\| dependency.matches_spec? s } return false if @only_install_dir !dependency.matching_specs.empty? end ## # Unpacks the gem into the given directory. def unpack(directory) @gem_dir = directory extract_files end rubygems_deprecate :unpack ## # The location of the spec file that is installed. # def spec_file File.join gem_home, "specifications", "#{spec.full_name}.gemspec" end ## # The location of the default spec file for default gems. # def default_spec_file File.join gem_home, "specifications", "default", "#{spec.full_name}.gemspec" end ## # Writes the .gemspec specification (in Ruby) to the gem home's # specifications directory. def write_spec spec.installed_by_version = Gem.rubygems_version Gem.write_binary(spec_file, spec.to_ruby_for_cache) end ## # Writes the full .gemspec specification (in Ruby) to the gem home's # specifications/default directory. def write_default_spec Gem.write_binary(default_spec_file, spec.to_ruby) end ## # Creates windows .bat files for easy running of commands def generate_windows_script(filename, bindir) if Gem.win_platform? script_name = formatted_program_filename(filename) + ".bat" script_path = File.join bindir, File.basename(script_name) File.open script_path, "w" do \|file\| file.puts windows_stub_script(bindir, filename) end verbose script_path end end def generate_bin # :nodoc: return if spec.executables.nil? \|\| spec.executables.empty? ensure_writable_dir @bin_dir spec.executables.each do \|filename\| filename.tap(&Gem::UNTAINT) bin_path = File.join gem_dir, spec.bindir, filename next unless File.exist? bin_path mode = File.stat(bin_path).mode dir_mode = options[:prog_mode] \|\| (mode \| 0111) unless dir_mode == mode require "fileutils" FileUtils.chmod dir_mode, bin_path end check_executable_overwrite filename if @wrappers generate_bin_script filename, @bin_dir else generate_bin_symlink filename, @bin_dir end end end def generate_plugins # :nodoc: latest = Gem::Specification.latest_spec_for(spec.name) 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 ## # Creates the scripts to run the applications in the gem. #-- # The Windows script is generated in addition to the regular one due to a # bug or misfeature in the Windows shell's pipe. See # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/193379 def generate_bin_script(filename, bindir) bin_script_path = File.join bindir, formatted_program_filename(filename) require "fileutils" FileUtils.rm_f bin_script_path # prior install may have been --no-wrappers File.open bin_script_path, "wb", 0755 do \|file\| file.print app_script_text(filename) file.chmod(options[:prog_mode] \|\| 0755) end verbose bin_script_path generate_windows_script filename, bindir end ## # Creates the symlinks to run the applications in the gem. Moves # the symlink if the gem being installed has a newer version. def generate_bin_symlink(filename, bindir) src = File.join gem_dir, spec.bindir, filename dst = File.join bindir, formatted_program_filename(filename) if File.exist? dst if File.symlink? dst link = File.readlink(dst).split File::SEPARATOR cur_version = Gem::Version.create(link[-3].sub(/^.-/, "")) return if spec.version < cur_version end File.unlink dst end FileUtils.symlink src, dst, :verbose => Gem.configuration.really_verbose rescue NotImplementedError, SystemCallError alert_warning "Unable to use symlinks, installing wrapper" generate_bin_script filename, bindir end ## # Generates a #! line for +bin_file_name+'s wrapper copying arguments if # necessary. # # If the :custom_shebang config is set, then it is used as a template # for how to create the shebang used for to run a gem's executables. # # The template supports 4 expansions: # # $env the path to the unix env utility # $ruby the path to the currently running ruby interpreter # $exec the path to the gem's executable # $name the name of the gem the executable is for # def shebang(bin_file_name) path = File.join gem_dir, spec.bindir, bin_file_name first_line = File.open(path, "rb") {\|file\| file.gets } \|\| "" if first_line.start_with?("#!") # Preserve extra words on shebang line, like "-w". Thanks RPA. shebang = first_line.sub(/\A\#!.?ruby\S((\s+\S+)+)/, "#!#{Gem.ruby}") opts = $1 shebang.strip! # Avoid nasty ^M issues. end if which = Gem.configuration[:custom_shebang] # replace bin_file_name with "ruby" to avoid endless loops which = which.gsub(/ #{bin_file_name}$/," #{ruby_install_name}") which = which.gsub(/\$(\w+)/) do case $1 when "env" @env_path \|\|= ENV_PATHS.find {\|env_path\| File.executable? env_path } when "ruby" "#{Gem.ruby}#{opts}" when "exec" bin_file_name when "name" spec.name end end "#!#{which}" elsif @env_shebang # Create a plain shebang line. @env_path \|\|= ENV_PATHS.find {\|env_path\| File.executable? env_path } "#!#{@env_path} #{ruby_install_name}" else "#{bash_prolog_script}#!#{Gem.ruby}#{opts}" end end ## # Ensures the Gem::Specification written out for this gem is loadable upon # installation. def ensure_loadable_spec ruby = spec.to_ruby_for_cache ruby.tap(&Gem::UNTAINT) begin eval ruby rescue StandardError, SyntaxError => e raise Gem::InstallError, "The specification for #{spec.full_name} is corrupt (#{e.class})" end end def ensure_dependencies_met # :nodoc: deps = spec.runtime_dependencies deps \|= spec.development_dependencies if @development deps.each do \|dep_gem\| ensure_dependency spec, dep_gem end end def process_options # :nodoc: @options = { :bin_dir => nil, :env_shebang => false, :force => false, :only_install_dir => false, :post_install_message => true, }.merge options @env_shebang = options[:env_shebang] @force = options[:force] @install_dir = options[:install_dir] @gem_home = options[:install_dir] \|\| Gem.dir @plugins_dir = Gem.plugindir(@gem_home) @ignore_dependencies = options[:ignore_dependencies] @format_executable = options[:format_executable] @wrappers = options[:wrappers] @only_install_dir = options[:only_install_dir] # If the user has asked for the gem to be installed in a directory that is # the system gem directory, then use the system bin directory, else create # (or use) a new bin dir under the gem_home. @bin_dir = options[:bin_dir] \|\| Gem.bindir(gem_home) @development = options[:development] @build_root = options[:build_root] @build_args = options[:build_args] unless @build_root.nil? @bin_dir = File.join(@build_root, @bin_dir.gsub(/^[a-zA-Z]:/, "")) @gem_home = File.join(@build_root, @gem_home.gsub(/^[a-zA-Z]:/, "")) @plugins_dir = File.join(@build_root, @plugins_dir.gsub(/^[a-zA-Z]:/, "")) alert_warning "You build with buildroot.\n Build root: #{@build_root}\n Bin dir: #{@bin_dir}\n Gem home: #{@gem_home}\n Plugins dir: #{@plugins_dir}" end end def check_that_user_bin_dir_is_in_path # :nodoc: return if self.class.path_warning user_bin_dir = @bin_dir \|\| Gem.bindir(gem_home) user_bin_dir = user_bin_dir.tr(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR path = ENV["PATH"] path = path.tr(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR if Gem.win_platform? path = path.downcase user_bin_dir = user_bin_dir.downcase end path = path.split(File::PATH_SEPARATOR) unless path.include? user_bin_dir unless !Gem.win_platform? && (path.include? user_bin_dir.sub(ENV["HOME"], "~")) alert_warning "You don't have #{user_bin_dir} in your PATH,\n\t gem executables will not run." self.class.path_warning = true end end end def verify_gem_home # :nodoc: FileUtils.mkdir_p gem_home, :mode => options[:dir_mode] && 0755 raise Gem::FilePermissionError, gem_home unless File.writable?(gem_home) end def verify_spec unless spec.name =~ Gem::Specification::VALID_NAME_PATTERN raise Gem::InstallError, "#{spec} has an invalid name" end if spec.raw_require_paths.any? {\|path\| path =~ /\R/ } raise Gem::InstallError, "#{spec} has an invalid require_paths" end if spec.extensions.any? {\|ext\| ext =~ /\R/ } raise Gem::InstallError, "#{spec} has an invalid extensions" end if spec.platform.to_s =~ /\R/ raise Gem::InstallError, "#{spec.platform} is an invalid platform" end unless spec.specification_version.to_s =~ /\A\d+\z/ raise Gem::InstallError, "#{spec} has an invalid specification_version" end if spec.dependencies.any? {\|dep\| dep.type != :runtime && dep.type != :development } raise Gem::InstallError, "#{spec} has an invalid dependencies" end if spec.dependencies.any? {\|dep\| dep.name =~ /(?:\R\|[<>])/ } raise Gem::InstallError, "#{spec} has an invalid dependencies" end end ## # Return the text for an application file. def app_script_text(bin_file_name) # note that the `load` lines cannot be indented, as old RG versions match # against the beginning of the line return <<-TEXT #{shebang bin_file_name} # # This file was generated by RubyGems. # # The application '#{spec.name}' is installed as part of a gem, and # this file is here to facilitate running it. # require 'rubygems' #{gemdeps_load(spec.name)} version = "#{Gem::Requirement.default_prerelease}" str = ARGV.first if str str = str.b[/\\A_(.)_\\z/, 1] if str and Gem::Version.correct?(str) #{explicit_version_requirement(spec.name)} ARGV.shift end end if Gem.respond_to?(:activate_bin_path) load Gem.activate_bin_path('#{spec.name}', '#{bin_file_name}', version) else gem #{spec.name.dump}, version load Gem.bin_path(#{spec.name.dump}, #{bin_file_name.dump}, version) end TEXT end def gemdeps_load(name) return "" if name == "bundler" <<-TEXT Gem.use_gemdeps TEXT end def explicit_version_requirement(name) code = "version = str" return code unless name == "bundler" code += <<-TEXT ENV['BUNDLER_VERSION'] = str TEXT end ## # return the stub script text used to launch the true Ruby script def windows_stub_script(bindir, bin_file_name) rb_topdir = RbConfig::TOPDIR \|\| File.dirname(rb_config["bindir"]) # get ruby executable file name from RbConfig ruby_exe = "#{rb_config['RUBY_INSTALL_NAME']}#{rb_config['EXEEXT']}" ruby_exe = "ruby.exe" if ruby_exe.empty? if File.exist?(File.join bindir, ruby_exe) # stub & ruby.exe within same folder. Portable <<-TEXT @ECHO OFF @"%~dp0#{ruby_exe}" "%~dpn0" % TEXT elsif bindir.downcase.start_with? rb_topdir.downcase # stub within ruby folder, but not standard bin. Portable require "pathname" from = Pathname.new bindir to = Pathname.new "#{rb_topdir}/bin" rel = to.relative_path_from from <<-TEXT @ECHO OFF @"%~dp0#{rel}/#{ruby_exe}" "%~dpn0" %* TEXT else # outside ruby folder, maybe -user-install or bundler. Portable, but ruby # is dependent on PATH <<-TEXT @ECHO OFF @#{ruby_exe} "%~dpn0" %* TEXT end end ## # Builds extensions. Valid types of extensions are extconf.rb files, # configure scripts and rakefiles or mkrf_conf files. def build_extensions builder = Gem::Ext::Builder.new spec, build_args builder.build_extensions end ## # Reads the file index and extracts each file into the gem directory. # # Ensures that files can't be installed outside the gem directory. def extract_files @package.extract_files gem_dir end ## # Extracts only the bin/ files from the gem into the gem directory. # This is used by default gems to allow a gem-aware stub to function # without the full gem installed. def extract_bin @package.extract_files gem_dir, "#{spec.bindir}/" end ## # Prefix and suffix the program filename the same as ruby. def formatted_program_filename(filename) if @format_executable self.class.exec_format % File.basename(filename) else filename end end ## # # Return the target directory where the gem is to be installed. This # directory is not guaranteed to be populated. # def dir gem_dir.to_s end ## # Filename of the gem being installed. def gem @package.gem.path end ## # Performs various checks before installing the gem such as the install # repository is writable and its directories exist, required Ruby and # rubygems versions are met and that dependencies are installed. # # Version and dependency checks are skipped if this install is forced. # # The dependent check will be skipped if the install is ignoring dependencies. def pre_install_checks verify_gem_home # The name and require_paths must be verified first, since it could contain # ruby code that would be eval'ed in #ensure_loadable_spec verify_spec ensure_loadable_spec if options[:install_as_default] Gem.ensure_default_gem_subdirectories gem_home else Gem.ensure_gem_subdirectories gem_home end return true if @force ensure_dependencies_met unless @ignore_dependencies true end ## # Writes the file containing the arguments for building this gem's # extensions. def write_build_info_file return if build_args.empty? build_info_dir = File.join gem_home, "build_info" dir_mode = options[:dir_mode] FileUtils.mkdir_p build_info_dir, :mode => dir_mode && 0755 build_info_file = File.join build_info_dir, "#{spec.full_name}.info" File.open build_info_file, "w" do \|io\| build_args.each do \|arg\| io.puts arg end end File.chmod(dir_mode, build_info_dir) if dir_mode end ## # Writes the .gem file to the cache directory def write_cache_file cache_file = File.join gem_home, "cache", spec.file_name @package.copy_to cache_file end def ensure_writable_dir(dir) # :nodoc: begin Dir.mkdir dir, [options[:dir_mode] && 0755].compact rescue SystemCallError raise unless File.directory? dir end raise Gem::FilePermissionError.new(dir) unless File.writable? dir end private def build_args @build_args \|\|= begin require_relative "command" Gem::Command.build_args end end def rb_config RbConfig::CONFIG end def ruby_install_name rb_config["ruby_install_name"] end def load_relative_enabled? rb_config["LIBRUBY_RELATIVE"] == "yes" end def bash_prolog_script if load_relative_enabled? script = +<<~EOS bindir="${0%/}" EOS script << %Q(exec "$bindir/#{ruby_install_name}" "-x" "$0" "$@"\n) <<~EOS #!/bin/sh # -- ruby -*- _=_\\ =begin #{script.chomp} =end EOS else "" end end end Back

Edit File : installer.rb | Size : 26.76 KB

# frozen_string_literal: true
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require_relative "installer_uninstaller_utils"
require_relative "exceptions"
require_relative "deprecate"
require_relative "package"
require_relative "ext"
require_relative "user_interaction"

##
# The installer installs the files contained in the .gem into the Gem.home.
#
# Gem::Installer does the work of putting files in all the right places on the
# filesystem including unpacking the gem into its gem dir, installing the
# gemspec in the specifications dir, storing the cached gem in the cache dir,
# and installing either wrappers or symlinks for executables.
#
# The installer invokes pre and post install hooks.  Hooks can be added either
# through a rubygems_plugin.rb file in an installed gem or via a
# rubygems/defaults/#{RUBY_ENGINE}.rb or rubygems/defaults/operating_system.rb
# file.  See Gem.pre_install and Gem.post_install for details.

class Gem::Installer
  extend Gem::Deprecate

##
  # Paths where env(1) might live.  Some systems are broken and have it in
  # /bin

ENV_PATHS = %w[/usr/bin/env /bin/env].freeze

##
  # Deprecated in favor of Gem::Ext::BuildError

ExtensionBuildError = Gem::Ext::BuildError # :nodoc:

include Gem::UserInteraction

include Gem::InstallerUninstallerUtils

##
  # The directory a gem's executables will be installed into

attr_reader :bin_dir

attr_reader :build_root # :nodoc:

##
  # The gem repository the gem will be installed into

attr_reader :gem_home

##
  # The options passed when the Gem::Installer was instantiated.

attr_reader :options

##
  # The gem package instance.

attr_reader :package

@path_warning = false

class << self
    #
    # Changes in rubygems to lazily loading `rubygems/command` (in order to
    # lazily load `optparse` as a side effect) affect bundler's custom installer
    # which uses `Gem::Command` without requiring it (up until bundler 2.2.29).
    # This hook is to compensate for that missing require.
    #
    # TODO: Remove when rubygems no longer supports running on bundler older
    # than 2.2.29.

def inherited(klass)
      if klass.name == "Bundler::RubyGemsGemInstaller"
        require "rubygems/command"
      end

super(klass)
    end

##
    # True if we've warned about PATH not including Gem.bindir

attr_accessor :path_warning

##
    # Overrides the executable format.
    #
    # This is a sprintf format with a "%s" which will be replaced with the
    # executable name.  It is based off the ruby executable name's difference
    # from "ruby".

attr_writer :exec_format

# Defaults to use Ruby's program prefix and suffix.
    def exec_format
      @exec_format ||= Gem.default_exec_format
    end
  end

##
  # Construct an installer object for the gem file located at +path+

def self.at(path, options = {})
    security_policy = options[:security_policy]
    package = Gem::Package.new path, security_policy
    new package, options
  end

class FakePackage
    attr_accessor :spec

attr_accessor :dir_mode
    attr_accessor :prog_mode
    attr_accessor :data_mode

def initialize(spec)
      @spec = spec
    end

def extract_files(destination_dir, pattern = "*")
      FileUtils.mkdir_p destination_dir

spec.files.each do |file|
        file = File.join destination_dir, file
        next if File.exist? file
        FileUtils.mkdir_p File.dirname(file)
        File.open file, "w" do |fp|
          fp.puts "# #{file}"
        end
      end
    end

def copy_to(path)
    end
  end

##
  # Construct an installer object for an ephemeral gem (one where we don't
  # actually have a .gem file, just a spec)

def self.for_spec(spec, options = {})
    # FIXME: we should have a real Package class for this
    new FakePackage.new(spec), options
  end

##
  # Constructs an Installer instance that will install the gem at +package+ which
  # can either be a path or an instance of Gem::Package.  +options+ is a Hash
  # with the following keys:
  #
  # :bin_dir:: Where to put a bin wrapper if needed.
  # :development:: Whether or not development dependencies should be installed.
  # :env_shebang:: Use /usr/bin/env in bin wrappers.
  # :force:: Overrides all version checks and security policy checks, except
  #          for a signed-gems-only policy.
  # :format_executable:: Format the executable the same as the Ruby executable.
  #                      If your Ruby is ruby18, foo_exec will be installed as
  #                      foo_exec18.
  # :ignore_dependencies:: Don't raise if a dependency is missing.
  # :install_dir:: The directory to install the gem into.
  # :security_policy:: Use the specified security policy.  See Gem::Security
  # :user_install:: Indicate that the gem should be unpacked into the users
  #                 personal gem directory.
  # :only_install_dir:: Only validate dependencies against what is in the
  #                     install_dir
  # :wrappers:: Install wrappers if true, symlinks if false.
  # :build_args:: An Array of arguments to pass to the extension builder
  #               process. If not set, then Gem::Command.build_args is used
  # :post_install_message:: Print gem post install message if true

def initialize(package, options={})
    require "fileutils"

@options = options
    @package = package

process_options

@package.dir_mode = options[:dir_mode]
    @package.prog_mode = options[:prog_mode]
    @package.data_mode = options[:data_mode]

if options[:user_install]
      @gem_home = Gem.user_dir
      @bin_dir = Gem.bindir gem_home unless options[:bin_dir]
      @plugins_dir = Gem.plugindir(gem_home)
      check_that_user_bin_dir_is_in_path
    end
  end

##
  # Checks if +filename+ exists in +@bin_dir+.
  #
  # If +@force+ is set +filename+ is overwritten.
  #
  # If +filename+ exists and it is a RubyGems wrapper for a different gem, then
  # the user is consulted.
  #
  # If +filename+ exists and +@bin_dir+ is Gem.default_bindir (/usr/local) the
  # user is consulted.
  #
  # Otherwise +filename+ is overwritten.

def check_executable_overwrite(filename) # :nodoc:
    return if @force

generated_bin = File.join @bin_dir, formatted_program_filename(filename)

return unless File.exist? generated_bin

ruby_executable = false
    existing = nil

File.open generated_bin, "rb" do |io|
      line = io.gets
      shebang = /^#!.*ruby/

if load_relative_enabled?
        until line.nil? || line =~ shebang do
          line = io.gets
        end
      end

next unless line =~ shebang

io.gets # blankline

# TODO detect a specially formatted comment instead of trying
      # to run a regexp against Ruby code.
      next unless io.gets =~ /This file was generated by RubyGems/

ruby_executable = true
      existing = io.read.slice(%r{
          ^\s*(
            gem \s |
            load \s Gem\.bin_path\( |
            load \s Gem\.activate_bin_path\(
          )
          (['"])(.*?)(\2),
        }x, 3)
    end

return if spec.name == existing

# somebody has written to RubyGems' directory, overwrite, too bad
    return if Gem.default_bindir != @bin_dir && !ruby_executable

question = "#{spec.name}'s executable \"#{filename}\" conflicts with ".dup

if ruby_executable
      question << (existing || "an unknown executable")

return if ask_yes_no "#{question}\nOverwrite the executable?", false

conflict = "installed executable from #{existing}"
    else
      question << generated_bin

return if ask_yes_no "#{question}\nOverwrite the executable?", false

conflict = generated_bin
    end

raise Gem::InstallError,
      "\"#{filename}\" from #{spec.name} conflicts with #{conflict}"
  end

##
  # Lazy accessor for the spec's gem directory.

def gem_dir
    @gem_dir ||= File.join(gem_home, "gems", spec.full_name)
  end

##
  # Lazy accessor for the installer's spec.

def spec
    @package.spec
  end

##
  # Installs the gem and returns a loaded Gem::Specification for the installed
  # gem.
  #
  # The gem will be installed with the following structure:
  #
  #   @gem_home/
  #     cache/<gem-version>.gem #=> a cached copy of the installed gem
  #     gems/<gem-version>/... #=> extracted files
  #     specifications/<gem-version>.gemspec #=> the Gem::Specification

def install
    pre_install_checks

run_pre_install_hooks

# Set loaded_from to ensure extension_dir is correct
    if @options[:install_as_default]
      spec.loaded_from = default_spec_file
    else
      spec.loaded_from = spec_file
    end

# Completely remove any previous gem files
    FileUtils.rm_rf gem_dir
    FileUtils.rm_rf spec.extension_dir

dir_mode = options[:dir_mode]
    FileUtils.mkdir_p gem_dir, :mode => dir_mode && 0755

if @options[:install_as_default]
      extract_bin
      write_default_spec
    else
      extract_files

build_extensions
      write_build_info_file
      run_post_build_hooks
    end

generate_bin
    generate_plugins

unless @options[:install_as_default]
      write_spec
      write_cache_file
    end

File.chmod(dir_mode, gem_dir) if dir_mode

say spec.post_install_message if options[:post_install_message] && !spec.post_install_message.nil?

Gem::Specification.add_spec(spec)

run_post_install_hooks

spec

# TODO This rescue is in the wrong place. What is raising this exception?
  # move this rescue to around the code that actually might raise it.
  rescue Zlib::GzipFile::Error
    raise Gem::InstallError, "gzip error installing #{gem}"
  end

def run_pre_install_hooks # :nodoc:
    Gem.pre_install_hooks.each do |hook|
      if hook.call(self) == false
        location = " at #{$1}" if hook.inspect =~ /[ @](.*:\d+)/

message = "pre-install hook#{location} failed for #{spec.full_name}"
        raise Gem::InstallError, message
      end
    end
  end

def run_post_build_hooks # :nodoc:
    Gem.post_build_hooks.each do |hook|
      if hook.call(self) == false
        FileUtils.rm_rf gem_dir

location = " at #{$1}" if hook.inspect =~ /[ @](.*:\d+)/

message = "post-build hook#{location} failed for #{spec.full_name}"
        raise Gem::InstallError, message
      end
    end
  end

def run_post_install_hooks # :nodoc:
    Gem.post_install_hooks.each do |hook|
      hook.call self
    end
  end

##
  #
  # Return an Array of Specifications contained within the gem_home
  # we'll be installing into.

def installed_specs
    @specs ||= begin
      specs = []

Gem::Util.glob_files_in_dir("*.gemspec", File.join(gem_home, "specifications")).each do |path|
        spec = Gem::Specification.load path.tap(&Gem::UNTAINT)
        specs << spec if spec
      end

specs
    end
  end

##
  # Ensure that the dependency is satisfied by the current installation of
  # gem.  If it is not an exception is raised.
  #
  # spec       :: Gem::Specification
  # dependency :: Gem::Dependency

def ensure_dependency(spec, dependency)
    unless installation_satisfies_dependency? dependency
      raise Gem::InstallError, "#{spec.name} requires #{dependency}"
    end
    true
  end

##
  # True if the gems in the system satisfy +dependency+.

def installation_satisfies_dependency?(dependency)
    return true if @options[:development] && dependency.type == :development
    return true if installed_specs.detect {|s| dependency.matches_spec? s }
    return false if @only_install_dir
    !dependency.matching_specs.empty?
  end

##
  # Unpacks the gem into the given directory.

def unpack(directory)
    @gem_dir = directory
    extract_files
  end
  rubygems_deprecate :unpack

##
  # The location of the spec file that is installed.
  #

def spec_file
    File.join gem_home, "specifications", "#{spec.full_name}.gemspec"
  end

##
  # The location of the default spec file for default gems.
  #

def default_spec_file
    File.join gem_home, "specifications", "default", "#{spec.full_name}.gemspec"
  end

##
  # Writes the .gemspec specification (in Ruby) to the gem home's
  # specifications directory.

def write_spec
    spec.installed_by_version = Gem.rubygems_version

Gem.write_binary(spec_file, spec.to_ruby_for_cache)
  end

##
  # Writes the full .gemspec specification (in Ruby) to the gem home's
  # specifications/default directory.

def write_default_spec
    Gem.write_binary(default_spec_file, spec.to_ruby)
  end

##
  # Creates windows .bat files for easy running of commands

def generate_windows_script(filename, bindir)
    if Gem.win_platform?
      script_name = formatted_program_filename(filename) + ".bat"
      script_path = File.join bindir, File.basename(script_name)
      File.open script_path, "w" do |file|
        file.puts windows_stub_script(bindir, filename)
      end

verbose script_path
    end
  end

def generate_bin # :nodoc:
    return if spec.executables.nil? || spec.executables.empty?

ensure_writable_dir @bin_dir

spec.executables.each do |filename|
      filename.tap(&Gem::UNTAINT)
      bin_path = File.join gem_dir, spec.bindir, filename
      next unless File.exist? bin_path

mode = File.stat(bin_path).mode
      dir_mode = options[:prog_mode] || (mode | 0111)

unless dir_mode == mode
        require "fileutils"
        FileUtils.chmod dir_mode, bin_path
      end

check_executable_overwrite filename

if @wrappers
        generate_bin_script filename, @bin_dir
      else
        generate_bin_symlink filename, @bin_dir
      end
    end
  end

def generate_plugins # :nodoc:
    latest = Gem::Specification.latest_spec_for(spec.name)
    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

##
  # Creates the scripts to run the applications in the gem.
  #--
  # The Windows script is generated in addition to the regular one due to a
  # bug or misfeature in the Windows shell's pipe.  See
  # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/193379

def generate_bin_script(filename, bindir)
    bin_script_path = File.join bindir, formatted_program_filename(filename)

require "fileutils"
    FileUtils.rm_f bin_script_path # prior install may have been --no-wrappers

File.open bin_script_path, "wb", 0755 do |file|
      file.print app_script_text(filename)
      file.chmod(options[:prog_mode] || 0755)
    end

verbose bin_script_path

generate_windows_script filename, bindir
  end

##
  # Creates the symlinks to run the applications in the gem.  Moves
  # the symlink if the gem being installed has a newer version.

def generate_bin_symlink(filename, bindir)
    src = File.join gem_dir, spec.bindir, filename
    dst = File.join bindir, formatted_program_filename(filename)

if File.exist? dst
      if File.symlink? dst
        link = File.readlink(dst).split File::SEPARATOR
        cur_version = Gem::Version.create(link[-3].sub(/^.*-/, ""))
        return if spec.version < cur_version
      end
      File.unlink dst
    end

FileUtils.symlink src, dst, :verbose => Gem.configuration.really_verbose
  rescue NotImplementedError, SystemCallError
    alert_warning "Unable to use symlinks, installing wrapper"
    generate_bin_script filename, bindir
  end

##
  # Generates a #! line for +bin_file_name+'s wrapper copying arguments if
  # necessary.
  #
  # If the :custom_shebang config is set, then it is used as a template
  # for how to create the shebang used for to run a gem's executables.
  #
  # The template supports 4 expansions:
  #
  #  $env    the path to the unix env utility
  #  $ruby   the path to the currently running ruby interpreter
  #  $exec   the path to the gem's executable
  #  $name   the name of the gem the executable is for
  #

def shebang(bin_file_name)
    path = File.join gem_dir, spec.bindir, bin_file_name
    first_line = File.open(path, "rb") {|file| file.gets } || ""

if first_line.start_with?("#!")
      # Preserve extra words on shebang line, like "-w".  Thanks RPA.
      shebang = first_line.sub(/\A\#!.*?ruby\S*((\s+\S+)+)/, "#!#{Gem.ruby}")
      opts = $1
      shebang.strip! # Avoid nasty ^M issues.
    end

if which = Gem.configuration[:custom_shebang]
      # replace bin_file_name with "ruby" to avoid endless loops
      which = which.gsub(/ #{bin_file_name}$/," #{ruby_install_name}")

which = which.gsub(/\$(\w+)/) do
        case $1
        when "env"
          @env_path ||= ENV_PATHS.find {|env_path| File.executable? env_path }
        when "ruby"
          "#{Gem.ruby}#{opts}"
        when "exec"
          bin_file_name
        when "name"
          spec.name
        end
      end

"#!#{which}"
    elsif @env_shebang
      # Create a plain shebang line.
      @env_path ||= ENV_PATHS.find {|env_path| File.executable? env_path }
      "#!#{@env_path} #{ruby_install_name}"
    else
      "#{bash_prolog_script}#!#{Gem.ruby}#{opts}"
    end
  end

##
  # Ensures the Gem::Specification written out for this gem is loadable upon
  # installation.

def ensure_loadable_spec
    ruby = spec.to_ruby_for_cache
    ruby.tap(&Gem::UNTAINT)

begin
      eval ruby
    rescue StandardError, SyntaxError => e
      raise Gem::InstallError,
            "The specification for #{spec.full_name} is corrupt (#{e.class})"
    end
  end

def ensure_dependencies_met # :nodoc:
    deps = spec.runtime_dependencies
    deps |= spec.development_dependencies if @development

deps.each do |dep_gem|
      ensure_dependency spec, dep_gem
    end
  end

def process_options # :nodoc:
    @options = {
      :bin_dir      => nil,
      :env_shebang  => false,
      :force        => false,
      :only_install_dir => false,
      :post_install_message => true,
    }.merge options

@env_shebang         = options[:env_shebang]
    @force               = options[:force]
    @install_dir         = options[:install_dir]
    @gem_home            = options[:install_dir] || Gem.dir
    @plugins_dir         = Gem.plugindir(@gem_home)
    @ignore_dependencies = options[:ignore_dependencies]
    @format_executable   = options[:format_executable]
    @wrappers            = options[:wrappers]
    @only_install_dir    = options[:only_install_dir]

# If the user has asked for the gem to be installed in a directory that is
    # the system gem directory, then use the system bin directory, else create
    # (or use) a new bin dir under the gem_home.
    @bin_dir             = options[:bin_dir] || Gem.bindir(gem_home)
    @development         = options[:development]
    @build_root          = options[:build_root]

@build_args = options[:build_args]

unless @build_root.nil?
      @bin_dir = File.join(@build_root, @bin_dir.gsub(/^[a-zA-Z]:/, ""))
      @gem_home = File.join(@build_root, @gem_home.gsub(/^[a-zA-Z]:/, ""))
      @plugins_dir = File.join(@build_root, @plugins_dir.gsub(/^[a-zA-Z]:/, ""))
      alert_warning "You build with buildroot.\n  Build root: #{@build_root}\n  Bin dir: #{@bin_dir}\n  Gem home: #{@gem_home}\n  Plugins dir: #{@plugins_dir}"
    end
  end

def check_that_user_bin_dir_is_in_path # :nodoc:
    return if self.class.path_warning

user_bin_dir = @bin_dir || Gem.bindir(gem_home)
    user_bin_dir = user_bin_dir.tr(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR

path = ENV["PATH"]
    path = path.tr(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR

if Gem.win_platform?
      path = path.downcase
      user_bin_dir = user_bin_dir.downcase
    end

path = path.split(File::PATH_SEPARATOR)

unless path.include? user_bin_dir
      unless !Gem.win_platform? && (path.include? user_bin_dir.sub(ENV["HOME"], "~"))
        alert_warning "You don't have #{user_bin_dir} in your PATH,\n\t  gem executables will not run."
        self.class.path_warning = true
      end
    end
  end

def verify_gem_home # :nodoc:
    FileUtils.mkdir_p gem_home, :mode => options[:dir_mode] && 0755
    raise Gem::FilePermissionError, gem_home unless File.writable?(gem_home)
  end

def verify_spec
    unless spec.name =~ Gem::Specification::VALID_NAME_PATTERN
      raise Gem::InstallError, "#{spec} has an invalid name"
    end

if spec.raw_require_paths.any? {|path| path =~ /\R/ }
      raise Gem::InstallError, "#{spec} has an invalid require_paths"
    end

if spec.extensions.any? {|ext| ext =~ /\R/ }
      raise Gem::InstallError, "#{spec} has an invalid extensions"
    end

if spec.platform.to_s =~ /\R/
      raise Gem::InstallError, "#{spec.platform} is an invalid platform"
    end

unless spec.specification_version.to_s =~ /\A\d+\z/
      raise Gem::InstallError, "#{spec} has an invalid specification_version"
    end

if spec.dependencies.any? {|dep| dep.type != :runtime && dep.type != :development }
      raise Gem::InstallError, "#{spec} has an invalid dependencies"
    end

if spec.dependencies.any? {|dep| dep.name =~ /(?:\R|[<>])/ }
      raise Gem::InstallError, "#{spec} has an invalid dependencies"
    end
  end

##
  # Return the text for an application file.

def app_script_text(bin_file_name)
    # note that the `load` lines cannot be indented, as old RG versions match
    # against the beginning of the line
    return <<-TEXT
#{shebang bin_file_name}
#
# This file was generated by RubyGems.
#
# The application '#{spec.name}' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require 'rubygems'
#{gemdeps_load(spec.name)}
version = "#{Gem::Requirement.default_prerelease}"

str = ARGV.first
if str
  str = str.b[/\\A_(.*)_\\z/, 1]
  if str and Gem::Version.correct?(str)
    #{explicit_version_requirement(spec.name)}
    ARGV.shift
  end
end

if Gem.respond_to?(:activate_bin_path)
load Gem.activate_bin_path('#{spec.name}', '#{bin_file_name}', version)
else
gem #{spec.name.dump}, version
load Gem.bin_path(#{spec.name.dump}, #{bin_file_name.dump}, version)
end
TEXT
  end

def gemdeps_load(name)
    return "" if name == "bundler"

<<-TEXT

Gem.use_gemdeps
TEXT
  end

def explicit_version_requirement(name)
    code = "version = str"
    return code unless name == "bundler"

code += <<-TEXT

ENV['BUNDLER_VERSION'] = str
TEXT
  end

##
  # return the stub script text used to launch the true Ruby script

def windows_stub_script(bindir, bin_file_name)
    rb_topdir = RbConfig::TOPDIR || File.dirname(rb_config["bindir"])

# get ruby executable file name from RbConfig
    ruby_exe = "#{rb_config['RUBY_INSTALL_NAME']}#{rb_config['EXEEXT']}"
    ruby_exe = "ruby.exe" if ruby_exe.empty?

if File.exist?(File.join bindir, ruby_exe)
      # stub & ruby.exe within same folder.  Portable
      <<-TEXT
@ECHO OFF
@"%~dp0#{ruby_exe}" "%~dpn0" %*
      TEXT
    elsif bindir.downcase.start_with? rb_topdir.downcase
      # stub within ruby folder, but not standard bin.  Portable
      require "pathname"
      from = Pathname.new bindir
      to   = Pathname.new "#{rb_topdir}/bin"
      rel  = to.relative_path_from from
      <<-TEXT
@ECHO OFF
@"%~dp0#{rel}/#{ruby_exe}" "%~dpn0" %*
      TEXT
    else
      # outside ruby folder, maybe -user-install or bundler.  Portable, but ruby
      # is dependent on PATH
      <<-TEXT
@ECHO OFF
@#{ruby_exe} "%~dpn0" %*
      TEXT
    end
  end
  ##
  # Builds extensions.  Valid types of extensions are extconf.rb files,
  # configure scripts and rakefiles or mkrf_conf files.

def build_extensions
    builder = Gem::Ext::Builder.new spec, build_args

builder.build_extensions
  end

##
  # Reads the file index and extracts each file into the gem directory.
  #
  # Ensures that files can't be installed outside the gem directory.

def extract_files
    @package.extract_files gem_dir
  end

##
  # Extracts only the bin/ files from the gem into the gem directory.
  # This is used by default gems to allow a gem-aware stub to function
  # without the full gem installed.

def extract_bin
    @package.extract_files gem_dir, "#{spec.bindir}/*"
  end

##
  # Prefix and suffix the program filename the same as ruby.

def formatted_program_filename(filename)
    if @format_executable
      self.class.exec_format % File.basename(filename)
    else
      filename
    end
  end

##
  #
  # Return the target directory where the gem is to be installed. This
  # directory is not guaranteed to be populated.
  #

def dir
    gem_dir.to_s
  end

##
  # Filename of the gem being installed.

def gem
    @package.gem.path
  end

##
  # Performs various checks before installing the gem such as the install
  # repository is writable and its directories exist, required Ruby and
  # rubygems versions are met and that dependencies are installed.
  #
  # Version and dependency checks are skipped if this install is forced.
  #
  # The dependent check will be skipped if the install is ignoring dependencies.

def pre_install_checks
    verify_gem_home

# The name and require_paths must be verified first, since it could contain
    # ruby code that would be eval'ed in #ensure_loadable_spec
    verify_spec

ensure_loadable_spec

if options[:install_as_default]
      Gem.ensure_default_gem_subdirectories gem_home
    else
      Gem.ensure_gem_subdirectories gem_home
    end

return true if @force

ensure_dependencies_met unless @ignore_dependencies

true
  end

##
  # Writes the file containing the arguments for building this gem's
  # extensions.

def write_build_info_file
    return if build_args.empty?

build_info_dir = File.join gem_home, "build_info"

dir_mode = options[:dir_mode]
    FileUtils.mkdir_p build_info_dir, :mode => dir_mode && 0755

build_info_file = File.join build_info_dir, "#{spec.full_name}.info"

File.open build_info_file, "w" do |io|
      build_args.each do |arg|
        io.puts arg
      end
    end

File.chmod(dir_mode, build_info_dir) if dir_mode
  end

##
  # Writes the .gem file to the cache directory

def write_cache_file
    cache_file = File.join gem_home, "cache", spec.file_name
    @package.copy_to cache_file
  end

def ensure_writable_dir(dir) # :nodoc:
    begin
      Dir.mkdir dir, *[options[:dir_mode] && 0755].compact
    rescue SystemCallError
      raise unless File.directory? dir
    end

raise Gem::FilePermissionError.new(dir) unless File.writable? dir
  end

private

def build_args
    @build_args ||= begin
                      require_relative "command"
                      Gem::Command.build_args
                    end
  end

def rb_config
    RbConfig::CONFIG
  end

def ruby_install_name
    rb_config["ruby_install_name"]
  end

def load_relative_enabled?
    rb_config["LIBRUBY_RELATIVE"] == "yes"
  end

def bash_prolog_script
    if load_relative_enabled?
      script = +<<~EOS
        bindir="${0%/*}"
      EOS

script << %Q(exec "$bindir/#{ruby_install_name}" "-x" "$0" "$@"\n)

<<~EOS
        #!/bin/sh
        # -*- ruby -*-
        _=_\\
        =begin
        #{script.chomp}
        =end
      EOS
    else
      ""
    end
  end
end

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