Postponing the Bundler merge.

I faced a big issue about Bundler with ruby core.
  I have no time to resolve it issue before 2.5 final release.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61416 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/bundler/cli/exec.rb

@@ -1,105 +0,0 @@
-# frozen_string_literal: true
-
-require "bundler/current_ruby"
-
-module Bundler
-  class CLI::Exec
-    attr_reader :options, :args, :cmd
-
-    RESERVED_SIGNALS = %w[SEGV BUS ILL FPE VTALRM KILL STOP].freeze
-
-    def initialize(options, args)
-      @options = options
-      @cmd = args.shift
-      @args = args
-
-      if Bundler.current_ruby.ruby_2? && !Bundler.current_ruby.jruby?
-        @args << { :close_others => !options.keep_file_descriptors? }
-      elsif options.keep_file_descriptors?
-        Bundler.ui.warn "Ruby version #{RUBY_VERSION} defaults to keeping non-standard file descriptors on Kernel#exec."
-      end
-    end
-
-    def run
-      validate_cmd!
-      SharedHelpers.set_bundle_environment
-      if bin_path = Bundler.which(cmd)
-        if !Bundler.settings[:disable_exec_load] && ruby_shebang?(bin_path)
-          return kernel_load(bin_path, *args)
-        end
-        # First, try to exec directly to something in PATH
-        if Bundler.current_ruby.jruby_18?
-          kernel_exec(bin_path, *args)
-        else
-          kernel_exec([bin_path, cmd], *args)
-        end
-      else
-        # exec using the given command
-        kernel_exec(cmd, *args)
-      end
-    end
-
-  private
-
-    def validate_cmd!
-      return unless cmd.nil?
-      Bundler.ui.error "bundler: exec needs a command to run"
-      exit 128
-    end
-
-    def kernel_exec(*args)
-      ui = Bundler.ui
-      Bundler.ui = nil
-      Kernel.exec(*args)
-    rescue Errno::EACCES, Errno::ENOEXEC
-      Bundler.ui = ui
-      Bundler.ui.error "bundler: not executable: #{cmd}"
-      exit 126
-    rescue Errno::ENOENT
-      Bundler.ui = ui
-      Bundler.ui.error "bundler: command not found: #{cmd}"
-      Bundler.ui.warn "Install missing gem executables with `bundle install`"
-      exit 127
-    end
-
-    def kernel_load(file, *args)
-      args.pop if args.last.is_a?(Hash)
-      ARGV.replace(args)
-      $0 = file
-      Process.setproctitle(process_title(file, args)) if Process.respond_to?(:setproctitle)
-      ui = Bundler.ui
-      Bundler.ui = nil
-      require "bundler/setup"
-      signals = Signal.list.keys - RESERVED_SIGNALS
-      signals.each {|s| trap(s, "DEFAULT") }
-      Kernel.load(file)
-    rescue SystemExit, SignalException
-      raise
-    rescue Exception => e # rubocop:disable Lint/RescueException
-      Bundler.ui = ui
-      Bundler.ui.error "bundler: failed to load command: #{cmd} (#{file})"
-      backtrace = e.backtrace.take_while {|bt| !bt.start_with?(__FILE__) }
-      abort "#{e.class}: #{e.message}\n  #{backtrace.join("\n  ")}"
-    end
-
-    def process_title(file, args)
-      "#{file} #{args.join(" ")}".strip
-    end
-
-    def ruby_shebang?(file)
-      possibilities = [
-        "#!/usr/bin/env ruby\n",
-        "#!/usr/bin/env jruby\n",
-        "#!#{Gem.ruby}\n",
-      ]
-
-      if File.zero?(file)
-        Bundler.ui.warn "#{file} is empty"
-        return false
-      end
-
-      first_line = File.open(file, "rb") {|f| f.read(possibilities.map(&:size).max) }
-      possibilities.any? {|shebang| first_line.start_with?(shebang) }
-    end
-  end
-end