Class: Gem::Installer

Inherits:
Object show all
Extended by:
Deprecate
Includes:
InstallerUninstallerUtils, UserInteraction
Defined in:
lib/rubygems/installer.rb,
lib/rubygems/installer_test_case.rb

Overview

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.

Defined Under Namespace

Classes: FakePackage

Constant Summary collapse

ENV_PATHS =

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

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

Deprecated in favor of Gem::Ext::BuildError

Gem::Ext::BuildError

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Deprecate

deprecate, next_rubygems_major_version, rubygems_deprecate, rubygems_deprecate_command, skip, skip=, skip_during

Methods included from InstallerUninstallerUtils

#regenerate_plugins_for, #remove_plugins_for

Methods included from UserInteraction

#alert, #alert_error, #alert_warning, #ask, #ask_for_password, #ask_yes_no, #choose_from_list, #say, #terminate_interaction, #verbose

Methods included from DefaultUserInteraction

ui, #ui, ui=, #ui=, use_ui, #use_ui

Methods included from Text

#clean_text, #format_text, #levenshtein_distance, #min3, #truncate_text

Constructor Details

#initialize(package, options = {}) ⇒ Installer

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



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# File 'lib/rubygems/installer.rb', line 171

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

Class Attribute Details

.exec_format ⇒ Object

Defaults to use Ruby’s program prefix and suffix.



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# File 'lib/rubygems/installer.rb', line 95

def exec_format
  @exec_format ||= Gem.default_exec_format
end

.install_lock ⇒ Object (readonly)

Certain aspects of the install process are not thread-safe. This lock is used to allow multiple threads to install Gems at the same time.



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# File 'lib/rubygems/installer.rb', line 83

def install_lock
  @install_lock
end

.path_warning ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 77

def path_warning
  @path_warning
end

Instance Attribute Details

#bin_dir ⇒ Object

The directory a gem’s executables will be installed into



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# File 'lib/rubygems/installer.rb', line 50

def bin_dir
  @bin_dir
end

#build_args=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 14

def build_args=(value)
  @build_args = value
end

#build_root ⇒ Object (readonly)

:nodoc:



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# File 'lib/rubygems/installer.rb', line 52

def build_root
  @build_root
end

#env_shebang=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 39

def env_shebang=(value)
  @env_shebang = value
end

#force=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 24

def force=(value)
  @force = value
end

#format=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 29

def format=(value)
  @format = value
end

#format_executable=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 49

def format_executable=(value)
  @format_executable = value
end

#gem_dir ⇒ Object

Lazy accessor for the spec’s gem directory.



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# File 'lib/rubygems/installer.rb', line 261

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

#gem_home ⇒ Object

The gem repository the gem will be installed into



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# File 'lib/rubygems/installer.rb', line 57

def gem_home
  @gem_home
end

#ignore_dependencies=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 44

def ignore_dependencies=(value)
  @ignore_dependencies = value
end

#options ⇒ Object (readonly)

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



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# File 'lib/rubygems/installer.rb', line 62

def options
  @options
end

#package ⇒ Object (readonly)

The gem package instance.



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# File 'lib/rubygems/installer.rb', line 67

def package
  @package
end

#security_policy=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 54

def security_policy=(value)
  @security_policy = value
end

#wrappers=(value) ⇒ Object (writeonly)

Available through requiring rubygems/installer_test_case



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# File 'lib/rubygems/installer_test_case.rb', line 59

def wrappers=(value)
  @wrappers = value
end

Class Method Details

.at(path, options = {}) ⇒ Object

Construct an installer object for the gem file located at path



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# File 'lib/rubygems/installer.rb', line 103

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

.for_spec(spec, options = {}) ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 141

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

Instance Method Details

#app_script_text(bin_file_name) ⇒ Object

Return the text for an application file.



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# File 'lib/rubygems/installer.rb', line 751

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'

version = "#{Gem::Requirement.default_prerelease}"

str = ARGV.first
if str
str = str.b[/\\A_(.*)_\\z/, 1]
if str and Gem::Version.correct?(str)
  version = str
  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

#build_extensions ⇒ Object

Builds extensions. Valid types of extensions are extconf.rb files, configure scripts and rakefiles or mkrf_conf files.



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# File 'lib/rubygems/installer.rb', line 825

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

  builder.build_extensions
end

#check_executable_overwrite(filename) ⇒ Object

Checks if filename exists in @bin_dir.

If @force is set filename is overwritten.

If filename exists and is a RubyGems wrapper for different gem the user is consulted.

If filename exists and @bin_dir is Gem.default_bindir (/usr/local) the user is consulted.

Otherwise filename is overwritten.

Raises:



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# File 'lib/rubygems/installer.rb', line 204

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|
    next unless io.gets =~ /^#!/ # 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 and not 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

#check_that_user_bin_dir_is_in_path ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 689

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

#default_spec_file ⇒ Object

The location of the default spec file for default gems.



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# File 'lib/rubygems/installer.rb', line 434

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

#dir ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 866

def dir
  gem_dir.to_s
end

#ensure_dependencies_met ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 644

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

#ensure_dependency(spec, dependency) ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 396

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

#ensure_loadable_spec ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 632

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

#ensure_writable_dir(dir) ⇒ Object

:nodoc:

Raises:



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# File 'lib/rubygems/installer.rb', line 939

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

#extract_bin ⇒ Object

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.



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# File 'lib/rubygems/installer.rb', line 845

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

#extract_files ⇒ Object

Reads the file index and extracts each file into the gem directory.

Ensures that files can’t be installed outside the gem directory.



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# File 'lib/rubygems/installer.rb', line 836

def extract_files
  @package.extract_files gem_dir
end

#formatted_program_filename(filename) ⇒ Object

Prefix and suffix the program filename the same as ruby.



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# File 'lib/rubygems/installer.rb', line 852

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

#gem ⇒ Object

Filename of the gem being installed.



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# File 'lib/rubygems/installer.rb', line 873

def gem
  @package.gem.path
end

#generate_bin ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 477

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

    unless File.exist? bin_path
      if File.symlink? bin_path
        alert_warning "`#{bin_path}` is dangling symlink pointing to `#{File.readlink bin_path}`"
      else
        alert_warning "`#{bin_path}` does not exist, maybe `gem pristine #{spec.name}` will fix it?"
      end
      next
    end

    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

#generate_bin_script(filename, bindir) ⇒ Object

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 blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/193379



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# File 'lib/rubygems/installer.rb', line 533

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

#generate_bin_symlink(filename, bindir) ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 553

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

#generate_plugins ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 513

def generate_plugins # :nodoc:
  latest = Gem::Installer.install_lock.synchronize { 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

#generate_windows_script(filename, bindir) ⇒ Object

Creates windows .bat files for easy running of commands



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# File 'lib/rubygems/installer.rb', line 465

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

#install ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 285

def install
  pre_install_checks

  FileUtils.rm_f File.join gem_home, 'specifications', spec.spec_name

  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::Installer.install_lock.synchronize { Gem::Specification.reset }

  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

#installation_satisfies_dependency?(dependency) ⇒ Boolean

True if the gems in the system satisfy dependency.

Returns:

  • (Boolean) 


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# File 'lib/rubygems/installer.rb', line 406

def installation_satisfies_dependency?(dependency)
  return true if @options[:development] and dependency.type == :development
  return true if installed_specs.detect {|s| dependency.matches_spec? s }
  return false if @only_install_dir
  not dependency.matching_specs.empty?
end

#installed_specs ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 376

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

#pre_install_checks ⇒ Object

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.



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# File 'lib/rubygems/installer.rb', line 886

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

#process_options ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 653

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] || Gem::Command.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

#run_post_build_hooks ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 352

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

#run_post_install_hooks ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 365

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

#run_pre_install_hooks ⇒ Object

:nodoc:



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# File 'lib/rubygems/installer.rb', line 341

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

#shebang(bin_file_name) ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 587

def shebang(bin_file_name)
  ruby_name = RbConfig::CONFIG['ruby_install_name'] if @env_shebang
  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}$/," #{RbConfig::CONFIG['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 not ruby_name
    "#!#{Gem.ruby}#{opts}"
  elsif opts
    "#!/bin/sh\n'exec' #{ruby_name.dump} '-x' \"$0\" \"$@\"\n#{shebang}"
  else
    # Create a plain shebang line.
    @env_path ||= ENV_PATHS.find {|env_path| File.executable? env_path }
    "#!#{@env_path} #{ruby_name}"
  end
end

#spec ⇒ Object

Lazy accessor for the installer’s spec.



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# File 'lib/rubygems/installer.rb', line 268

def spec
  @package.spec
rescue Gem::Package::Error => e
  raise Gem::InstallError, "invalid gem: #{e.message}"
end

#spec_file ⇒ Object

The location of the spec file that is installed.



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# File 'lib/rubygems/installer.rb', line 426

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

#unpack(directory) ⇒ Object

Unpacks the gem into the given directory.



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# File 'lib/rubygems/installer.rb', line 416

def unpack(directory)
  @gem_dir = directory
  extract_files
end

#verify_gem_home ⇒ Object

:nodoc:

Raises:



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# File 'lib/rubygems/installer.rb', line 713

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

#verify_spec ⇒ Object 



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# File 'lib/rubygems/installer.rb', line 718

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

#windows_stub_script(bindir, bin_file_name) ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 788

def windows_stub_script(bindir, bin_file_name)
  rb_config = RbConfig::CONFIG
  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

#write_build_info_file ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 912

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

#write_cache_file ⇒ Object

Writes the .gem file to the cache directory



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# File 'lib/rubygems/installer.rb', line 934

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

#write_default_spec ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 456

def write_default_spec
  File.open(default_spec_file, "w") do |file|
    file.puts spec.to_ruby
  end
end

#write_spec ⇒ Object

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



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# File 'lib/rubygems/installer.rb', line 442

def write_spec
  File.open spec_file, 'w' do |file|
    spec.installed_by_version = Gem.rubygems_version

    file.puts spec.to_ruby_for_cache

    file.fsync rescue nil # for filesystems without fsync(2)
  end
end