Use stub executables generated by RubyGems istead of original executables.

It resolved the conflict issues when invoking `gem i rdoc` and the binstub
issues with Bundler and Rails.

  [Bug #5060][ruby-core:38257][Fix GH-2023]

  * https://github.com/rubygems/rubygems/pull/2338
  * https://github.com/heroku/heroku-buildpack-ruby/issues/829

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65963 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

6 files changed, 162 insertions, 0 deletions

diff --git a/libexec/bundle b/libexec/bundle
new file mode 100755
index 0000000000..aaf773745d
--- /dev/null
+++ b/libexec/bundle
@@ -0,0 +1,31 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Exit cleanly from an early interrupt
+Signal.trap("INT") do
+  Bundler.ui.debug("\n#{caller.join("\n")}") if defined?(Bundler)
+  exit 1
+end
+
+require "bundler"
+# Check if an older version of bundler is installed
+$LOAD_PATH.each do |path|
+  next unless path =~ %r{/bundler-0\.(\d+)} && $1.to_i < 9
+  err = String.new
+  err << "Looks like you have a version of bundler that's older than 0.9.\n"
+  err << "Please remove your old versions.\n"
+  err << "An easy way to do this is by running `gem cleanup bundler`."
+  abort(err)
+end
+
+require "bundler/friendly_errors"
+Bundler.with_friendly_errors do
+  require "bundler/cli"
+
+  # Allow any command to use --help flag to show help for that command
+  help_flags = %w[--help -h]
+  help_flag_used = ARGV.any? {|a| help_flags.include? a }
+  args = help_flag_used ? Bundler::CLI.reformatted_help_args(ARGV) : ARGV
+
+  Bundler::CLI.start(args, :debug => true)
+end
diff --git a/libexec/bundle_ruby b/libexec/bundle_ruby
new file mode 100755
index 0000000000..2209c6195f
--- /dev/null
+++ b/libexec/bundle_ruby
@@ -0,0 +1,60 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "bundler/shared_helpers"
+
+Bundler::SharedHelpers.major_deprecation(3, "the bundle_ruby executable has been removed in favor of `bundle platform --ruby`")
+
+Signal.trap("INT") { exit 1 }
+
+require "bundler/errors"
+require "bundler/ruby_version"
+require "bundler/ruby_dsl"
+
+module Bundler
+  class Dsl
+    include RubyDsl
+
+    attr_accessor :ruby_version
+
+    def initialize
+      @ruby_version = nil
+    end
+
+    def eval_gemfile(gemfile, contents = nil)
+      contents ||= File.open(gemfile, "rb", &:read)
+      instance_eval(contents, gemfile.to_s, 1)
+    rescue SyntaxError => e
+      bt = e.message.split("\n")[1..-1]
+      raise GemfileError, ["Gemfile syntax error:", *bt].join("\n")
+    rescue ScriptError, RegexpError, NameError, ArgumentError => e
+      e.backtrace[0] = "#{e.backtrace[0]}: #{e.message} (#{e.class})"
+      STDERR.puts e.backtrace.join("\n       ")
+      raise GemfileError, "There was an error in your Gemfile," \
+        " and Bundler cannot continue."
+    end
+
+    def source(source, options = {})
+    end
+
+    def gem(name, *args)
+    end
+
+    def group(*args)
+    end
+  end
+end
+
+dsl = Bundler::Dsl.new
+begin
+  dsl.eval_gemfile(Bundler::SharedHelpers.default_gemfile)
+  ruby_version = dsl.ruby_version
+  if ruby_version
+    puts ruby_version
+  else
+    puts "No ruby version specified"
+  end
+rescue Bundler::GemfileError => e
+  puts e.message
+  exit(-1)
+end
diff --git a/libexec/bundler b/libexec/bundler
new file mode 100755
index 0000000000..d9131fe834
--- /dev/null
+++ b/libexec/bundler
@@ -0,0 +1,4 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+load File.expand_path("../bundle", __FILE__)
diff --git a/libexec/irb b/libexec/irb
new file mode 100755
index 0000000000..c64ee85fbd
--- /dev/null
+++ b/libexec/irb
@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+#
+#   irb.rb - interactive ruby
+#   	$Release Version: 0.9.6 $
+#   	$Revision$
+#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+
+require "irb"
+
+IRB.start(__FILE__)
diff --git a/libexec/rdoc b/libexec/rdoc
new file mode 100755
index 0000000000..aaa23292df
--- /dev/null
+++ b/libexec/rdoc
@@ -0,0 +1,44 @@
+#!/usr/bin/env ruby
+#
+#  RDoc: Documentation tool for source code
+#        (see lib/rdoc/rdoc.rb for more information)
+#
+#  Copyright (c) 2003 Dave Thomas
+#  Released under the same terms as Ruby
+
+begin
+  gem 'rdoc'
+rescue NameError => e # --disable-gems
+  raise unless e.name == :gem
+rescue Gem::LoadError
+end
+
+require 'rdoc/rdoc'
+
+begin
+  r = RDoc::RDoc.new
+  r.document ARGV
+rescue Errno::ENOSPC
+  $stderr.puts 'Ran out of space creating documentation'
+  $stderr.puts
+  $stderr.puts 'Please free up some space and try again'
+rescue SystemExit
+  raise
+rescue Exception => e
+  if $DEBUG_RDOC then
+    $stderr.puts e.message
+    $stderr.puts "#{e.backtrace.join "\n\t"}"
+    $stderr.puts
+  elsif Interrupt === e then
+    $stderr.puts
+    $stderr.puts 'Interrupted'
+  else
+    $stderr.puts "uh-oh! RDoc had a problem:"
+    $stderr.puts e.message
+    $stderr.puts
+    $stderr.puts "run with --debug for full backtrace"
+  end
+
+  exit 1
+end
+
diff --git a/libexec/ri b/libexec/ri
new file mode 100755
index 0000000000..7fbed0c099
--- /dev/null
+++ b/libexec/ri
@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+
+begin
+  gem 'rdoc'
+rescue NameError => e # --disable-gems
+  raise unless e.name == :gem
+rescue Gem::LoadError
+end
+
+require 'rdoc/ri/driver'
+
+RDoc::RI::Driver.run ARGV