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, 60 insertions, 0 deletions

diff --git a/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb b/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb
new file mode 100644
index 0000000000..3a664401b4
--- /dev/null
+++ b/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb
@@ -0,0 +1,60 @@
+require "bundler/vendor/thor/lib/thor/actions/create_file"
+
+class Bundler::Thor
+  module Actions
+    # Create a new file relative to the destination root from the given source.
+    #
+    # ==== Parameters
+    # destination<String>:: the relative path to the destination root.
+    # source<String|NilClass>:: the relative path to the source root.
+    # config<Hash>:: give :verbose => false to not log the status.
+    #   :: give :symbolic => false for hard link.
+    #
+    # ==== Examples
+    #
+    #   create_link "config/apache.conf", "/etc/apache.conf"
+    #
+    def create_link(destination, *args)
+      config = args.last.is_a?(Hash) ? args.pop : {}
+      source = args.first
+      action CreateLink.new(self, destination, source, config)
+    end
+    alias_method :add_link, :create_link
+
+    # CreateLink is a subset of CreateFile, which instead of taking a block of
+    # data, just takes a source string from the user.
+    #
+    class CreateLink < CreateFile #:nodoc:
+      attr_reader :data
+
+      # Checks if the content of the file at the destination is identical to the rendered result.
+      #
+      # ==== Returns
+      # Boolean:: true if it is identical, false otherwise.
+      #
+      def identical?
+        exists? && File.identical?(render, destination)
+      end
+
+      def invoke!
+        invoke_with_conflict_check do
+          require "fileutils"
+          FileUtils.mkdir_p(File.dirname(destination))
+          # Create a symlink by default
+          config[:symbolic] = true if config[:symbolic].nil?
+          File.unlink(destination) if exists?
+          if config[:symbolic]
+            File.symlink(render, destination)
+          else
+            File.link(render, destination)
+          end
+        end
+        given_destination
+      end
+
+      def exists?
+        super || File.symlink?(destination)
+      end
+    end
+  end
+end