class Bundler::CLI::Exec

def run
  raise ArgumentError if cmd.nil?
  # First, try to exec directly to something in PATH
  SharedHelpers.set_bundle_environment
  bin_path = Bundler.which(@cmd)
  if bin_path
    Kernel.exec(bin_path, *args)
  end
  # If that didn't work, set up the whole bundle
  Bundler.definition.validate_ruby!
  Bundler.load.setup_environment
  Kernel.exec(@cmd, *args)
rescue Errno::EACCES
  Bundler.ui.error "bundler: not executable: #{cmd}"
  exit 126
rescue Errno::ENOENT
  Bundler.ui.error "bundler: command not found: #{cmd}"
  Bundler.ui.warn  "Install missing gem executables with `bundle install`"
  exit 127
rescue ArgumentError
  Bundler.ui.error "bundler: exec needs a command to run"
  exit 128
end