Merge bundler to standard libraries.

  rubygems 2.7.x depends bundler-1.15.x. This is preparation for
  rubygems and bundler migration.

  * lib/bundler.rb, lib/bundler/*: files of bundler-1.15.4
  * spec/bundler/*: rspec examples of bundler-1.15.4. I applied patches.
    * https://github.com/bundler/bundler/pull/6007
    * Exclude not working examples on ruby repository.
    * Fake ruby interpriter instead of installed ruby.
  * Makefile.in: Added test task named `test-bundler`. This task is only
    working macOS/linux yet. I'm going to support Windows environment later.
  * tool/sync_default_gems.rb: Added sync task for bundler.

  [Feature #12733][ruby-core:77172]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/bundler/version.rb b/lib/bundler/version.rb
new file mode 100644
index 0000000000..b2dad6dfb6
--- /dev/null
+++ b/lib/bundler/version.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# Ruby 1.9.3 and old RubyGems don't play nice with frozen version strings
+# rubocop:disable MutableConstant
+
+module Bundler
+  # We're doing this because we might write tests that deal
+  # with other versions of bundler and we are unsure how to
+  # handle this better.
+  VERSION = "1.15.4" unless defined?(::Bundler::VERSION)
+
+  def self.overwrite_loaded_gem_version
+    begin
+      require "rubygems"
+    rescue LoadError
+      return
+    end
+    return unless bundler_spec = Gem.loaded_specs["bundler"]
+    return if bundler_spec.version == VERSION
+    bundler_spec.version = Bundler::VERSION
+  end
+  private_class_method :overwrite_loaded_gem_version
+  overwrite_loaded_gem_version
+end