# module Gem

RubyGems is the Ruby standard for publishing and managing third party libraries.

For user documentation, see:

- `gem help` and `gem help [command]`

- RubyGems User Guide

- Frequently Asked Questions

For gem developer documentation see:

- Creating Gems

- `Gem::Specification`

- `Gem::Version` for version dependency notes

Further RubyGems documentation can be found at:

- RubyGems Guides

- RubyGems API (also available from `gem server`)

## RubyGems Plugins¶ ↑

As of RubyGems 1.3.2, RubyGems will load plugins installed in gems or $LOAD_PATH. Plugins must be named 'rubygems_plugin' (.rb, .so, etc) and placed at the root of your gem's require_path. Plugins are discovered via `Gem::find_files` and then loaded.

For an example plugin, see the Graph gem which adds a `gem graph` command.

## RubyGems Defaults, Packaging¶ ↑

RubyGems defaults are stored in lib/rubygems/defaults.rb. If you're packaging RubyGems or implementing Ruby you can change RubyGems' defaults.

For RubyGems packagers, provide lib/rubygems/defaults/operating_system.rb and override any defaults from lib/rubygems/defaults.rb.

For Ruby implementers, provide lib/rubygems/defaults/#{RUBY_ENGINE}.rb and override any defaults from lib/rubygems/defaults.rb.

If you need RubyGems to perform extra work on install or uninstall, your defaults override file can set pre/post install and uninstall hooks. See `Gem::pre_install`, `Gem::pre_uninstall`, `Gem::post_install`, `Gem::post_uninstall`.

## Bugs¶ ↑

You can submit bugs to the RubyGems bug tracker on GitHub

## Credits¶ ↑

RubyGems is currently maintained by Eric Hodel.

RubyGems was originally developed at RubyConf 2003 by:

- Rich Kilmer – rich(at)infoether.com

- Chad Fowler – chad(at)chadfowler.com

- David Black – dblack(at)wobblini.net

- Paul Brannan – paul(at)atdesk.com

- Jim Weirich – jim(at)weirichhouse.org

Contributors:

- Gavin Sinclair – gsinclair(at)soyabean.com.au

- George Marrows – george.marrows(at)ntlworld.com

- Dick Davies – rasputnik(at)hellooperator.net

- Mauricio Fernandez – batsman.geo(at)yahoo.com

- Simon Strandgaard – neoneye(at)adslhome.dk

- Dave Glasser – glasser(at)mit.edu

- Paul Duncan – pabs(at)pablotron.org

- Ville Aine – vaine(at)cs.helsinki.fi

- Eric Hodel – drbrain(at)segment7.net

- Daniel Berger – djberg96(at)gmail.com

- Phil Hagelberg – technomancy(at)gmail.com

- Ryan Davis – ryand-ruby(at)zenspider.com

- Evan Phoenix – evan(at)fallingsnow.net

- Steve Klabnik – steve(at)steveklabnik.com

(If your name is missing, PLEASE let us know!)

## License¶ ↑

See LICENSE.txt for permissions.

Thanks!

-The RubyGems Team

### Constants

DEFAULT_HOST
GEM_DEP_FILES
LOADED_SPECS_MUTEX
MARSHAL_SPEC_DIR

  Location of `Marshal` quick gemspecs on remote repositories

RDoc

  `Gem::RDoc` provides methods to generate `RDoc` and ri data for installed gems upon gem installation.

  This file is automatically required by RubyGems 1.9 and newer.

READ_BINARY_ERRORS

  `Exception` classes used in a `Gem.read_binary` `rescue` statement. Not all of these are defined in Ruby 1.8.7, hence the need for this convoluted setup.

REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES

  Subdirectories in a gem repository for default gems

REPOSITORY_SUBDIRECTORIES

  Subdirectories in a gem repository

RUBYGEMS_DIR
VERSION
WIN_PATTERNS

  An `Array` of Regexps that match windows Ruby platforms.

WRITE_BINARY_ERRORS

  `Exception` classes used in `Gem.write_binary` `rescue` statement. Not all of these are defined in Ruby 1.8.7.

### Attributes

done_installing_hooks[R]

The list of hooks to be run after `Gem::DependencyInstaller` installs a set of gems

gemdeps[R]

GemDependencyAPI object, which is set when .use_gemdeps is called. This contains all the information from the Gemfile.

loaded_specs[R]

`Hash` of loaded `Gem::Specification` keyed by name

post_build_hooks[R]

The list of hooks to be run after `Gem::Installer#install` extracts files and builds extensions

post_install_hooks[R]

The list of hooks to be run after `Gem::Installer#install` completes installation

post_reset_hooks[R]

The list of hooks to be run after `Gem::Specification.reset` is run.

post_uninstall_hooks[R]

The list of hooks to be run after `Gem::Uninstaller#uninstall` completes installation

pre_install_hooks[R]

The list of hooks to be run before `Gem::Installer#install` does any work

pre_reset_hooks[R]

The list of hooks to be run before `Gem::Specification.reset` is run.

pre_uninstall_hooks[R]

The list of hooks to be run before `Gem::Uninstaller#uninstall` does any work

### Public Class Methods

bin_path(name, exec_name = nil, *requirements) click to toggle source

`Find` the full path to the executable for gem `name`. If the `exec_name` is not given, an exception will be raised, otherwise the specified executable's path is returned. `requirements` allows you to specify specific gem versions.

    # File lib/rubygems.rb, line 253
    def self.bin_path(name, exec_name = nil, *requirements)
      # TODO: fails test_self_bin_path_bin_file_gone_in_latest
      # Gem::Specification.find_by_name(name, *requirements).bin_file exec_name

      raise ArgumentError, "you must supply exec_name" unless exec_name

      requirements = Gem::Requirement.default if
        requirements.empty?

      find_spec_for_exe(name, exec_name, requirements).bin_file exec_name
    end

binary_mode() click to toggle source

The mode needed to read a file as straight binary.

    # File lib/rubygems.rb, line 313
    def self.binary_mode
      'rb'
    end

bindir(install_dir=Gem.dir) click to toggle source

The path where gem executables are to be installed.

    # File lib/rubygems.rb, line 320
    def self.bindir(install_dir=Gem.dir)
      return File.join install_dir, 'bin' unless
        install_dir.to_s == Gem.default_dir.to_s
      Gem.default_bindir
    end

clear_default_specs() click to toggle source

Clear default gem related variables. It is for test

    # File lib/rubygems.rb, line 1292
    def clear_default_specs
      @path_to_default_spec_map.clear
    end

clear_paths() click to toggle source

Reset the `dir` and `path` values. The next time `dir` or `path` is requested, the values will be calculated from scratch. This is mainly used by the unit tests to provide test isolation.

    # File lib/rubygems.rb, line 331
    def self.clear_paths
      @paths         = nil
      @user_home     = nil
      Gem::Specification.reset
      Gem::Security.reset if defined?(Gem::Security)
    end

config_file() click to toggle source

The path to standard location of the user's .gemrc file.

    # File lib/rubygems.rb, line 341
    def self.config_file
      @config_file ||= File.join Gem.user_home, '.gemrc'
    end

configuration() click to toggle source

The standard configuration object for gems.

    # File lib/rubygems.rb, line 348
    def self.configuration
      @configuration ||= Gem::ConfigFile.new []
    end

configuration=(config) click to toggle source

Use the given configuration object (which implements the `ConfigFile` protocol) as the standard configuration object.

    # File lib/rubygems.rb, line 356
    def self.configuration=(config)
      @configuration = config
    end

datadir(gem_name) click to toggle source

The path to the data directory specified by the gem name. If the package is not available as a gem, return nil.

    # File lib/rubygems.rb, line 364
    def self.datadir(gem_name)
      spec = @loaded_specs[gem_name]
      return nil if spec.nil?
      spec.datadir
    end

default_bindir() click to toggle source

The default directory for binaries

    # File lib/rubygems/defaults.rb, line 117
    def self.default_bindir
      if defined? RUBY_FRAMEWORK_VERSION  # mac framework support
        '/usr/bin'
      else # generic install
        RbConfig::CONFIG['bindir']
      end
    end

default_cert_path() click to toggle source

The default signing certificate chain path

    # File lib/rubygems/defaults.rb, line 146
    def self.default_cert_path
      File.join Gem.user_home, ".gem", "gem-public_cert.pem"
    end

default_dir() click to toggle source

Default home directory path to be used if an alternate value is not specified in the environment

    # File lib/rubygems/defaults.rb, line 30
    def self.default_dir
      path = if defined? RUBY_FRAMEWORK_VERSION
               [
                 File.dirname(RbConfig::CONFIG['sitedir']),
                 'Gems',
                 RbConfig::CONFIG['ruby_version']
               ]
             elsif RbConfig::CONFIG['rubylibprefix']
               [
                 RbConfig::CONFIG['rubylibprefix'],
                 'gems',
                 RbConfig::CONFIG['ruby_version']
               ]
             else
               [
                 RbConfig::CONFIG['libdir'],
                 ruby_engine,
                 'gems',
                 RbConfig::CONFIG['ruby_version']
               ]
             end

      @default_dir ||= File.join(*path)
    end

default_exec_format() click to toggle source

Deduce Ruby's –program-prefix and –program-suffix from its install name

    # File lib/rubygems/defaults.rb, line 103
    def self.default_exec_format
      exec_format = RbConfig::CONFIG['ruby_install_name'].sub('ruby', '%s') rescue '%s'

      unless exec_format =~ /%s/
        raise Gem::Exception,
          "[BUG] invalid exec_format #{exec_format.inspect}, no %s"
      end

      exec_format
    end

default_ext_dir_for(base_dir) click to toggle source

Returns binary extensions dir for specified RubyGems base dir or nil if such directory cannot be determined.

By default, the binary extensions are located side by side with their Ruby counterparts, therefore nil is returned

    # File lib/rubygems/defaults.rb, line 62
    def self.default_ext_dir_for(base_dir)
      nil
    end

default_gems_use_full_paths?() click to toggle source

Whether to expect full paths in default gems - true for non-MRI ruby implementations

    # File lib/rubygems/defaults.rb, line 153
    def self.default_gems_use_full_paths?
      ruby_engine != 'ruby'
    end

default_key_path() click to toggle source

The default signing key path

    # File lib/rubygems/defaults.rb, line 139
    def self.default_key_path
      File.join Gem.user_home, ".gem", "gem-private_key.pem"
    end

default_path() click to toggle source

Default gem load path

    # File lib/rubygems/defaults.rb, line 92
    def self.default_path
      path = []
      path << user_dir if user_home && File.exist?(user_home)
      path << default_dir
      path << vendor_dir if vendor_dir and File.directory? vendor_dir
      path
    end

default_rubygems_dirs() click to toggle source

Paths where RubyGems' .rb files and bin files are installed

    # File lib/rubygems/defaults.rb, line 69
    def self.default_rubygems_dirs
      nil # default to standard layout
    end

default_sources() click to toggle source

An `Array` of the default sources that come with RubyGems

    # File lib/rubygems/defaults.rb, line 14
    def self.default_sources
      %w[https://rubygems.org/]
    end

default_spec_cache_dir() click to toggle source

Default spec directory path to be used if an alternate value is not specified in the environment

    # File lib/rubygems/defaults.rb, line 22
    def self.default_spec_cache_dir
      File.join Gem.user_home, '.gem', 'specs'
    end

deflate(data) click to toggle source

A `Zlib::Deflate.deflate` wrapper

    # File lib/rubygems.rb, line 373
    def self.deflate(data)
      require 'zlib'
      Zlib::Deflate.deflate data
    end

detect_gemdeps(path = nil)

TODO remove with RubyGems 4.0

Alias for: use_gemdeps
dir() click to toggle source

The path where gems are to be installed.

    # File lib/rubygems.rb, line 423
    def self.dir
      paths.home
    end

done_installing(&hook) click to toggle source

Adds a post-installs hook that will be passed a `Gem::DependencyInstaller` and a list of installed specifications when `Gem::DependencyInstaller#install` is complete

    # File lib/rubygems.rb, line 782
    def self.done_installing(&hook)
      @done_installing_hooks << hook
    end

ensure_default_gem_subdirectories(dir = Gem.dir, mode = nil) click to toggle source

Quietly ensure the Gem directory `dir` contains all the proper subdirectories for handling default gems. If we can't create a directory due to a permission problem, then we will silently continue.

If `mode` is given, missing directories are created with this mode.

World-writable directories will never be created.

    # File lib/rubygems.rb, line 457
    def self.ensure_default_gem_subdirectories(dir = Gem.dir, mode = nil)
      ensure_subdirectories(dir, mode, REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES)
    end

ensure_gem_subdirectories(dir = Gem.dir, mode = nil) click to toggle source

Quietly ensure the Gem directory `dir` contains all the proper subdirectories. If we can't create a directory due to a permission problem, then we will silently continue.

If `mode` is given, missing directories are created with this mode.

World-writable directories will never be created.

    # File lib/rubygems.rb, line 444
    def self.ensure_gem_subdirectories(dir = Gem.dir, mode = nil)
      ensure_subdirectories(dir, mode, REPOSITORY_SUBDIRECTORIES)
    end

env_requirement(gem_name) click to toggle source

    # File lib/rubygems.rb, line 914
    def self.env_requirement(gem_name)
      @env_requirements_by_name ||= {}
      @env_requirements_by_name[gem_name] ||= begin
        req = ENV["GEM_REQUIREMENT_#{gem_name.upcase}"] || '>= 0'.freeze
        Gem::Requirement.create(req)
      end
    end

find_files(glob, check_load_path=true) click to toggle source

Returns a list of paths matching `glob` that can be used by a gem to pick up features from other gems. For example:

    Gem.find_files('rdoc/discover').each do |path| load path end

if `check_load_path` is true (the default), then `find_files` also searches $LOAD_PATH for files as well as gems.

Note that `find_files` will return all files even if they are from different versions of the same gem. See also `find_latest_files`

    # File lib/rubygems.rb, line 504
    def self.find_files(glob, check_load_path=true)
      files = []

      files = find_files_from_load_path glob if check_load_path

      gem_specifications = @gemdeps ? Gem.loaded_specs.values : Gem::Specification.stubs

      files.concat gem_specifications.map { |spec|
        spec.matches_for_glob("#{glob}#{Gem.suffix_pattern}")
      }.flatten

      # $LOAD_PATH might contain duplicate entries or reference
      # the spec dirs directly, so we prune.
      files.uniq! if check_load_path

      return files
    end

find_latest_files(glob, check_load_path=true) click to toggle source

Returns a list of paths matching `glob` from the latest gems that can be used by a gem to pick up features from other gems. For example:

    Gem.find_latest_files('rdoc/discover').each do |path| load path end

if `check_load_path` is true (the default), then `find_latest_files` also searches $LOAD_PATH for files as well as gems.

Unlike `find_files`, `find_latest_files` will return only files from the latest version of a gem.

    # File lib/rubygems.rb, line 541
    def self.find_latest_files(glob, check_load_path=true)
      files = []

      files = find_files_from_load_path glob if check_load_path

      files.concat Gem::Specification.latest_specs(true).map { |spec|
        spec.matches_for_glob("#{glob}#{Gem.suffix_pattern}")
      }.flatten

      # $LOAD_PATH might contain duplicate entries or reference
      # the spec dirs directly, so we prune.
      files.uniq! if check_load_path

      return files
    end

find_unresolved_default_spec(path) click to toggle source

`Find` a `Gem::Specification` of default gem from `path`

    # File lib/rubygems.rb, line 1275
    def find_unresolved_default_spec(path)
      @path_to_default_spec_map[path]
    end

finish_resolve(request_set=Gem::RequestSet.new) click to toggle source

    # File lib/rubygems.rb, line 238
    def self.finish_resolve(request_set=Gem::RequestSet.new)
      request_set.import Gem::Specification.unresolved_deps.values
      request_set.import Gem.loaded_specs.values.map {|s| Gem::Dependency.new(s.name, s.version) }

      request_set.resolve_current.each do |s|
        s.full_spec.activate
      end
    end

gunzip(data) click to toggle source

`Zlib::GzipReader` wrapper that unzips `data`.

    # File lib/rubygems.rb, line 591
    def self.gunzip(data)
      Gem::Util.gunzip data
    end

gzip(data) click to toggle source

`Zlib::GzipWriter` wrapper that zips `data`.

    # File lib/rubygems.rb, line 603
    def self.gzip(data)
      Gem::Util.gzip data
    end

host() click to toggle source

Get the default RubyGems API host. This is normally `https://rubygems.org`.

    # File lib/rubygems.rb, line 643
    def self.host
      # TODO: move to utils
      @host ||= Gem::DEFAULT_HOST
    end

host=(host) click to toggle source

`Set` the default RubyGems API host.

    # File lib/rubygems.rb, line 650
    def self.host=(host)
      # TODO: move to utils
      @host = host
    end

inflate(data) click to toggle source

A `Zlib::Inflate#inflate` wrapper

    # File lib/rubygems.rb, line 615
    def self.inflate(data)
      Gem::Util.inflate data
    end

install(name, version = Gem::Requirement.default, *options) click to toggle source

Top level install helper method. Allows you to install gems interactively:

    % irb
    >> Gem.install "minitest"
    Fetching: minitest-3.0.1.gem (100%)
    => [#<Gem::Specification:0x1013b4528 @name="minitest", ...>]

    # File lib/rubygems.rb, line 632
    def self.install(name, version = Gem::Requirement.default, *options)
      require "rubygems/dependency_installer"
      inst = Gem::DependencyInstaller.new(*options)
      inst.install name, version
      inst.installed_gems
    end

latest_rubygems_version() click to toggle source

Returns the latest release version of RubyGems.

    # File lib/rubygems.rb, line 939
    def self.latest_rubygems_version
      latest_version_for('rubygems-update') or
        raise "Can't find 'rubygems-update' in any repo. Check `gem source list`."
    end

latest_spec_for(name) click to toggle source

Returns the latest release-version specification for the gem `name`.

    # File lib/rubygems.rb, line 926
    def self.latest_spec_for(name)
      dependency   = Gem::Dependency.new name
      fetcher      = Gem::SpecFetcher.fetcher
      spec_tuples, = fetcher.spec_for_dependency dependency

      spec, = spec_tuples.first

      spec
    end

latest_version_for(name) click to toggle source

Returns the version of the latest release-version of gem `name`

    # File lib/rubygems.rb, line 947
    def self.latest_version_for(name)
      spec = latest_spec_for name
      spec and spec.version
    end

load_env_plugins() click to toggle source

`Find` all 'rubygems_plugin' files in $LOAD_PATH and load them

    # File lib/rubygems.rb, line 1118
    def self.load_env_plugins
      path = "rubygems_plugin"

      files = []
      glob = "#{path}#{Gem.suffix_pattern}"
      $LOAD_PATH.each do |load_path|
        globbed = Gem::Util.glob_files_in_dir(glob, load_path)

        globbed.each do |load_path_file|
          files << load_path_file if File.file?(load_path_file.untaint)
        end
      end

      load_plugin_files files
    end

load_path_insert_index() click to toggle source

The index to insert activated gem paths into the $LOAD_PATH. The activated gem's paths are inserted before site lib directory by default.

    # File lib/rubygems.rb, line 659
    def self.load_path_insert_index
      $LOAD_PATH.each_with_index do |path, i|
        return i if path.instance_variable_defined?(:@gem_prelude_index)
      end

      index = $LOAD_PATH.index RbConfig::CONFIG['sitelibdir']

      index
    end

load_plugins() click to toggle source

`Find` the 'rubygems_plugin' files in the latest installed gems and load them

    # File lib/rubygems.rb, line 1106
    def self.load_plugins
      # Remove this env var by at least 3.0
      if ENV['RUBYGEMS_LOAD_ALL_PLUGINS']
        load_plugin_files find_files('rubygems_plugin', false)
      else
        load_plugin_files find_latest_files('rubygems_plugin', false)
      end
    end

load_yaml() click to toggle source

Loads YAML, preferring `Psych`

    # File lib/rubygems.rb, line 674
    def self.load_yaml
      return if @yaml_loaded
      return unless defined?(gem)

      begin
        gem 'psych', '>= 2.0.0'
      rescue Gem::LoadError
        # It's OK if the user does not have the psych gem installed.  We will
        # attempt to require the stdlib version
      end

      begin
        # Try requiring the gem version *or* stdlib version of psych.
        require 'psych'
      rescue ::LoadError
        # If we can't load psych, thats fine, go on.
      else
        # If 'yaml' has already been required, then we have to
        # be sure to switch it over to the newly loaded psych.
        if defined?(YAML::ENGINE) && YAML::ENGINE.yamler != "psych"
          YAML::ENGINE.yamler = "psych"
        end

        require 'rubygems/psych_additions'
        require 'rubygems/psych_tree'
      end

      require 'yaml'
      require 'rubygems/safe_yaml'

      # Now that we're sure some kind of yaml library is loaded, pull
      # in our hack to deal with Syck's DefaultKey ugliness.
      require 'rubygems/syck_hack'

      @yaml_loaded = true
    end

location_of_caller(depth = 1) click to toggle source

The file name and line number of the caller of the caller of this method.

`depth` is how many layers up the call stack it should go.

e.g.,

def a; `Gem.location_of_caller`; end a #=> [“x.rb”, 2] # (it'll vary depending on file name and line number)

def b; c; end def c; `Gem.location_of_caller(2)`; end b #=> [“x.rb”, 6] # (it'll vary depending on file name and line number)

    # File lib/rubygems.rb, line 725
    def self.location_of_caller(depth = 1)
      caller[depth] =~ /(.*?):(\d+).*?$/i
      file = $1
      lineno = $2.to_i

      [file, lineno]
    end

marshal_version() click to toggle source

The version of the `Marshal` format for your Ruby.

    # File lib/rubygems.rb, line 736
    def self.marshal_version
      "#{Marshal::MAJOR_VERSION}.#{Marshal::MINOR_VERSION}"
    end

needs() { |rs| ... } click to toggle source

    # File lib/rubygems.rb, line 230
    def self.needs
      rs = Gem::RequestSet.new

      yield rs

      finish_resolve rs
    end

operating_system_defaults() click to toggle source

Default options for gem commands for Ruby packagers.

The options here should be structured as an array of string “gem” command names as keys and a string of the default options as values.

Example:

def self.operating_system_defaults

    {
        'install' => '--no-rdoc --no-ri --env-shebang',
        'update' => '--no-rdoc --no-ri --env-shebang'
    }

end

    # File lib/rubygems/defaults.rb, line 193
    def self.operating_system_defaults
      {}
    end

path() click to toggle source

    # File lib/rubygems.rb, line 427
    def self.path
      paths.path
    end

path_separator() click to toggle source

How `String` Gem paths should be split. Overridable for esoteric platforms.

    # File lib/rubygems/defaults.rb, line 85
    def self.path_separator
      File::PATH_SEPARATOR
    end

paths() click to toggle source

Retrieve the `PathSupport` object that RubyGems uses to lookup files.

    # File lib/rubygems.rb, line 381
    def self.paths
      @paths ||= Gem::PathSupport.new(ENV)
    end

paths=(env) click to toggle source

Initialize the filesystem paths to use from `env`. `env` is a hash-like object (typically `ENV`) that is queried for 'GEM_HOME', 'GEM_PATH', and 'GEM_SPEC_CACHE' Keys for the `env` hash should be Strings, and values of the hash should be Strings or `nil`.

    # File lib/rubygems.rb, line 391
      def self.paths=(env)
        clear_paths
        target = {}
        env.each_pair do |k,v|
          case k
          when 'GEM_HOME', 'GEM_PATH', 'GEM_SPEC_CACHE'
            case v
            when nil, String
              target[k] = v
            when Array
              unless Gem::Deprecate.skip
                warn <<-eowarn
    Array values in the parameter to `Gem.paths=` are deprecated.
    Please use a String or nil.
    An Array (#{env.inspect}) was passed in from #{caller[3]}
                eowarn
              end
              target[k] = v.join File::PATH_SEPARATOR
            end
          else
            target[k] = v
          end
        end
        @paths = Gem::PathSupport.new ENV.to_hash.merge(target)
        Gem::Specification.dirs = @paths.path
      end

platform_defaults() click to toggle source

Default options for gem commands for Ruby implementers.

The options here should be structured as an array of string “gem” command names as keys and a string of the default options as values.

Example:

def self.platform_defaults

    {
        'install' => '--no-rdoc --no-ri --env-shebang',
        'update' => '--no-rdoc --no-ri --env-shebang'
    }

end

    # File lib/rubygems/defaults.rb, line 212
    def self.platform_defaults
      {}
    end

platforms() click to toggle source

`Array` of platforms this RubyGems supports.

    # File lib/rubygems.rb, line 750
    def self.platforms
      @platforms ||= []
      if @platforms.empty?
        @platforms = [Gem::Platform::RUBY, Gem::Platform.local]
      end
      @platforms
    end

platforms=(platforms) click to toggle source

`Set` array of platforms this RubyGems supports (primarily for testing).

    # File lib/rubygems.rb, line 743
    def self.platforms=(platforms)
      @platforms = platforms
    end

post_build(&hook) click to toggle source

Adds a post-build hook that will be passed an `Gem::Installer` instance when `Gem::Installer#install` is called. The hook is called after the gem has been extracted and extensions have been built but before the executables or gemspec has been written. If the hook returns `false` then the gem's files will be removed and the install will be aborted.

    # File lib/rubygems.rb, line 765
    def self.post_build(&hook)
      @post_build_hooks << hook
    end

post_install(&hook) click to toggle source

Adds a post-install hook that will be passed an `Gem::Installer` instance when `Gem::Installer#install` is called

    # File lib/rubygems.rb, line 773
    def self.post_install(&hook)
      @post_install_hooks << hook
    end

post_reset(&hook) click to toggle source

Adds a hook that will get run after `Gem::Specification.reset` is run.

    # File lib/rubygems.rb, line 790
    def self.post_reset(&hook)
      @post_reset_hooks << hook
    end

post_uninstall(&hook) click to toggle source

Adds a post-uninstall hook that will be passed a `Gem::Uninstaller` instance and the spec that was uninstalled when `Gem::Uninstaller#uninstall` is called

    # File lib/rubygems.rb, line 799
    def self.post_uninstall(&hook)
      @post_uninstall_hooks << hook
    end

pre_install(&hook) click to toggle source

Adds a pre-install hook that will be passed an `Gem::Installer` instance when `Gem::Installer#install` is called. If the hook returns `false` then the install will be aborted.

    # File lib/rubygems.rb, line 808
    def self.pre_install(&hook)
      @pre_install_hooks << hook
    end

pre_reset(&hook) click to toggle source

Adds a hook that will get run before `Gem::Specification.reset` is run.

    # File lib/rubygems.rb, line 816
    def self.pre_reset(&hook)
      @pre_reset_hooks << hook
    end

pre_uninstall(&hook) click to toggle source

Adds a pre-uninstall hook that will be passed an `Gem::Uninstaller` instance and the spec that will be uninstalled when `Gem::Uninstaller#uninstall` is called

    # File lib/rubygems.rb, line 825
    def self.pre_uninstall(&hook)
      @pre_uninstall_hooks << hook
    end

prefix() click to toggle source

The directory prefix this RubyGems was installed at. If your prefix is in a standard location (ie, rubygems is installed where you'd expect it to be), then prefix returns nil.

    # File lib/rubygems.rb, line 834
    def self.prefix
      prefix = File.dirname RUBYGEMS_DIR

      if prefix != File.expand_path(RbConfig::CONFIG['sitelibdir']) and
         prefix != File.expand_path(RbConfig::CONFIG['libdir']) and
         'lib' == File.basename(RUBYGEMS_DIR)
        prefix
      end
    end

read_binary(path) click to toggle source

Safely read a file in binary mode on all platforms.

    # File lib/rubygems.rb, line 854
    def self.read_binary(path)
      File.open path, 'rb+' do |f|
        f.flock(File::LOCK_EX)
        f.read
      end
    rescue *READ_BINARY_ERRORS
      File.open path, 'rb' do |f|
        f.read
      end
    rescue Errno::ENOLCK # NFS
      if Thread.main != Thread.current
        raise
      else
        File.open path, 'rb' do |f|
          f.read
        end
      end
    end

refresh() click to toggle source

Refresh available gems from disk.

    # File lib/rubygems.rb, line 847
    def self.refresh
      Gem::Specification.reset
    end

register_default_spec(spec) click to toggle source

Register a `Gem::Specification` for default gem.

Two formats for the specification are supported:

- MRI 2.0 style, where spec.files contains unprefixed require names. The spec's filenames will be registered as-is.

- New style, where spec.files contains files prefixed with paths from spec.require_paths. The prefixes are stripped before registering the spec's filenames. Unprefixed files are omitted.

    # File lib/rubygems.rb, line 1251
    def register_default_spec(spec)
      new_format = Gem.default_gems_use_full_paths? || spec.require_paths.any? {|path| spec.files.any? {|f| f.start_with? path } }

      if new_format
        prefix_group = spec.require_paths.map {|f| f + "/"}.join("|")
        prefix_pattern = /^(#{prefix_group})/
      end

      suffix_pattern = /#{Regexp.union(Gem.suffixes)}\z/

      spec.files.each do |file|
        if new_format
          file = file.sub(prefix_pattern, "")
          next unless $~
        end

        @path_to_default_spec_map[file] = spec
        @path_to_default_spec_map[file.sub(suffix_pattern, "")] = spec
      end
    end

remove_unresolved_default_spec(spec) click to toggle source

Remove needless `Gem::Specification` of default gem from unresolved default gem list

    # File lib/rubygems.rb, line 1283
    def remove_unresolved_default_spec(spec)
      spec.files.each do |file|
        @path_to_default_spec_map.delete(file)
      end
    end

ruby() click to toggle source

The path to the running Ruby interpreter.

    # File lib/rubygems.rb, line 896
    def self.ruby
      if @ruby.nil?
        @ruby = File.join(RbConfig::CONFIG['bindir'],
                          "#{RbConfig::CONFIG['ruby_install_name']}#{RbConfig::CONFIG['EXEEXT']}")

        @ruby = "\"#{@ruby}\"" if @ruby =~ /\s/
      end

      @ruby
    end

ruby=(ruby) click to toggle source

Allows setting path to Ruby. This method is available when requiring 'rubygems/test_case'

    # File lib/rubygems/test_case.rb, line 87
    def self.ruby=(ruby)
      @ruby = ruby
    end

ruby_api_version() click to toggle source

Returns a `String` containing the API compatibility version of Ruby

    # File lib/rubygems.rb, line 910
    def self.ruby_api_version
      @ruby_api_version ||= RbConfig::CONFIG['ruby_version'].dup
    end

ruby_engine() click to toggle source

A wrapper around RUBY_ENGINE const that may not be defined

    # File lib/rubygems/defaults.rb, line 128
    def self.ruby_engine
      if defined? RUBY_ENGINE
        RUBY_ENGINE
      else
        'ruby'
      end
    end

ruby_version() click to toggle source

A `Gem::Version` for the currently running Ruby.

    # File lib/rubygems.rb, line 955
    def self.ruby_version
      return @ruby_version if defined? @ruby_version
      version = RUBY_VERSION.dup

      if defined?(RUBY_PATCHLEVEL) && RUBY_PATCHLEVEL != -1
        version << ".#{RUBY_PATCHLEVEL}"
      elsif defined?(RUBY_DESCRIPTION)
        if RUBY_ENGINE == "ruby"
          desc = RUBY_DESCRIPTION[/\Aruby #{Regexp.quote(RUBY_VERSION)}([^ ]+) /, 1]
        else
          desc = RUBY_DESCRIPTION[/\A#{RUBY_ENGINE} #{Regexp.quote(RUBY_ENGINE_VERSION)} \(#{RUBY_VERSION}([^ ]+)\) /, 1]
        end
        version << ".#{desc}" if desc
      end

      @ruby_version = Gem::Version.new version
    end

rubygems_version() click to toggle source

A `Gem::Version` for the currently running RubyGems

    # File lib/rubygems.rb, line 976
    def self.rubygems_version
      return @rubygems_version if defined? @rubygems_version
      @rubygems_version = Gem::Version.new Gem::VERSION
    end

searcher=(searcher) click to toggle source

Allows setting the gem path searcher. This method is available when requiring 'rubygems/test_case'

    # File lib/rubygems/test_case.rb, line 71
    def self.searcher=(searcher)
      @searcher = searcher
    end

sources() click to toggle source

Returns an `Array` of sources to fetch remote gems from. Uses `default_sources` if the sources list is empty.

    # File lib/rubygems.rb, line 985
    def self.sources
      source_list = configuration.sources || default_sources
      @sources ||= Gem::SourceList.from(source_list)
    end

sources=(new_sources) click to toggle source

Need to be able to set the sources without calling `Gem.sources`.replace since that would cause an infinite loop.

DOC: This comment is not documentation about the method itself, it's more of a code comment about the implementation.

    # File lib/rubygems.rb, line 997
    def self.sources=(new_sources)
      if !new_sources
        @sources = nil
      else
        @sources = Gem::SourceList.from(new_sources)
      end
    end

spec_cache_dir() click to toggle source

    # File lib/rubygems.rb, line 431
    def self.spec_cache_dir
      paths.spec_cache_dir
    end

suffix_pattern() click to toggle source

Glob pattern for require-able path suffixes.

    # File lib/rubygems.rb, line 1008
    def self.suffix_pattern
      @suffix_pattern ||= "{#{suffixes.join(',')}}"
    end

suffixes() click to toggle source

Suffixes for require-able paths.

    # File lib/rubygems.rb, line 1015
    def self.suffixes
      @suffixes ||= ['',
                     '.rb',
                     *%w(DLEXT DLEXT2).map { |key|
                       val = RbConfig::CONFIG[key]
                       next unless val and not val.empty?
                       ".#{val}"
                     }
                    ].compact.uniq
    end

time(msg, width = 0, display = Gem.configuration.verbose) { || ... } click to toggle source

Prints the amount of time the supplied block takes to run using the debug UI output.

    # File lib/rubygems.rb, line 1030
    def self.time(msg, width = 0, display = Gem.configuration.verbose)
      now = Time.now

      value = yield

      elapsed = Time.now - now

      ui.say "%2$*1$s: %3$3.3fs" % [-width, msg, elapsed] if display

      value
    end

try_activate(path) click to toggle source

Try to activate a gem containing `path`. Returns true if activation succeeded or wasn't needed because it was already activated. Returns false if it can't find the path in a gem.

    # File lib/rubygems.rb, line 205
    def self.try_activate(path)
      # finds the _latest_ version... regardless of loaded specs and their deps
      # if another gem had a requirement that would mean we shouldn't
      # activate the latest version, then either it would already be activated
      # or if it was ambiguous (and thus unresolved) the code in our custom
      # require will try to activate the more specific version.

      spec = Gem::Specification.find_by_path path
      return false unless spec
      return true if spec.activated?

      begin
        spec.activate
      rescue Gem::LoadError => e # this could fail due to gem dep collisions, go lax
        spec_by_name = Gem::Specification.find_by_name(spec.name)
        if spec_by_name.nil?
          raise e
        else
          spec_by_name.activate
        end
      end

      return true
    end

ui() click to toggle source

Lazily loads `DefaultUserInteraction` and returns the default UI.

    # File lib/rubygems.rb, line 1045
    def self.ui
      require 'rubygems/user_interaction'

      Gem::DefaultUserInteraction.ui
    end

use_gemdeps(path = nil) click to toggle source

Looks for a gem dependency file at `path` and activates the gems in the file if found. If the file is not found an `ArgumentError` is raised.

If `path` is not given the RUBYGEMS_GEMDEPS environment variable is used, but if no file is found no exception is raised.

If '-' is given for `path` RubyGems searches up from the current working directory for gem dependency files (gem.deps.rb, Gemfile, Isolate) and activates the gems in the first one found.

You can run this automatically when rubygems starts. To enable, set the `RUBYGEMS_GEMDEPS` environment variable to either the path of your gem dependencies file or “-” to auto-discover in parent directories.

NOTE: Enabling automatic discovery on multiuser systems can lead to execution of arbitrary code when used from directories outside your control.

    # File lib/rubygems.rb, line 1154
    def self.use_gemdeps(path = nil)
      raise_exception = path

      path ||= ENV['RUBYGEMS_GEMDEPS']
      return unless path

      path = path.dup

      if path == "-"
        Gem::Util.traverse_parents Dir.pwd do |directory|
          dep_file = GEM_DEP_FILES.find { |f| File.file?(f) }

          next unless dep_file

          path = File.join directory, dep_file
          break
        end
      end

      path.untaint

      unless File.file? path
        return unless raise_exception

        raise ArgumentError, "Unable to find gem dependencies file at #{path}"
      end

      if USE_BUNDLER_FOR_GEMDEPS

        ENV["BUNDLE_GEMFILE"] ||= File.expand_path(path)
        require 'rubygems/user_interaction'
        Gem::DefaultUserInteraction.use_ui(ui) do
          require "bundler"
          @gemdeps = Bundler.setup
          Bundler.ui = nil
          @gemdeps.requested_specs.map(&:to_spec).sort_by(&:name)
        end

      else

        rs = Gem::RequestSet.new
        @gemdeps = rs.load_gemdeps path

        rs.resolve_current.map do |s|
          s.full_spec.tap(&:activate)
        end

      end
    rescue => e
      case e
      when Gem::LoadError, Gem::UnsatisfiableDependencyError, (defined?(Bundler::GemNotFound) ? Bundler::GemNotFound : Gem::LoadError)
        warn e.message
        warn "You may need to `gem install -g` to install missing gems"
        warn ""
      else
        raise
      end
    end

Also aliased as: detect_gemdeps
use_paths(home, *paths) click to toggle source

Use the `home` and `paths` values for `Gem.dir` and `Gem.path`. Used mainly by the unit tests to provide environment isolation.

    # File lib/rubygems.rb, line 1055
    def self.use_paths(home, *paths)
      paths.flatten!
      paths.compact!
      hash = { "GEM_HOME" => home, "GEM_PATH" => paths.empty? ? home : paths.join(File::PATH_SEPARATOR) }
      hash.delete_if { |_, v| v.nil? }
      self.paths = hash
    end

user_dir() click to toggle source

Path for gems in the user's home directory

    # File lib/rubygems/defaults.rb, line 76
    def self.user_dir
      parts = [Gem.user_home, '.gem', ruby_engine]
      parts << RbConfig::CONFIG['ruby_version'] unless RbConfig::CONFIG['ruby_version'].empty?
      File.join parts
    end

user_home() click to toggle source

The home directory for the user.

    # File lib/rubygems.rb, line 1066
    def self.user_home
      @user_home ||= find_home.untaint
    end

win_platform=(val) click to toggle source

Allows toggling Windows behavior. This method is available when requiring 'rubygems/test_case'

    # File lib/rubygems/test_case.rb, line 79
    def self.win_platform=(val)
      @@win_platform = val
    end

win_platform?() click to toggle source

Is this a windows platform?

    # File lib/rubygems.rb, line 1073
    def self.win_platform?
      if @@win_platform.nil?
        ruby_platform = RbConfig::CONFIG['host_os']
        @@win_platform = !!WIN_PATTERNS.find { |r| ruby_platform =~ r }
      end

      @@win_platform
    end

write_binary(path, data) click to toggle source

Safely write a file in binary mode on all platforms.

    # File lib/rubygems.rb, line 875
    def self.write_binary(path, data)
      open(path, 'wb') do |io|
        begin
          io.flock(File::LOCK_EX)
        rescue *WRITE_BINARY_ERRORS
        end
        io.write data
      end
    rescue Errno::ENOLCK # NFS
      if Thread.main != Thread.current
        raise
      else
        open(path, 'wb') do |io|
          io.write data
        end
      end
    end

### Private Class Methods

find_home() click to toggle source

Finds the user's home directory.

    # File lib/rubygems.rb, line 574
    def self.find_home
      Dir.home.dup
    rescue
      if Gem.win_platform?
        File.expand_path File.join(ENV['HOMEDRIVE'] || ENV['SystemDrive'], '/')
      else
        File.expand_path "/"
      end
    end

find_spec_for_exe(name, exec_name, requirements) click to toggle source

    # File lib/rubygems.rb, line 265
    def self.find_spec_for_exe(name, exec_name, requirements)
      dep = Gem::Dependency.new name, requirements

      loaded = Gem.loaded_specs[name]

      return loaded if loaded && dep.matches_spec?(loaded)

      specs = dep.matching_specs(true)

      specs = specs.find_all { |spec|
        spec.executables.include? exec_name
      } if exec_name

      unless spec = specs.first
        msg = "can't find gem #{dep} with executable #{exec_name}"
        if name == "bundler" && bundler_message = Gem::BundlerVersionFinder.missing_version_message
          msg = bundler_message
        end
        raise Gem::GemNotFoundException, msg
      end

      spec
    end