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

1 files changed, 31 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