# File lib/bundler/rubygems_integration.rb, line 161
    def spec_from_gem(path, policy = nil)
      require 'rubygems/security'
      gem_from_path(path, Gem::Security::Policies[policy]).spec
    rescue Gem::Package::FormatError
      raise GemspecError, "Could not read gem at #{path}. It may be corrupted."
    rescue Exception, Gem::Exception, Gem::Security::Exception => e
      if e.is_a?(Gem::Security::Exception) ||
          e.message =~ /unknown trust policy|unsigned gem/i ||
          e.message =~ /couldn't verify (meta)?data signature/i
        raise SecurityError,
          "The gem #{File.basename(path, '.gem')} can't be installed because " \
          "the security policy didn't allow it, with the message: #{e.message}"
      else
        raise e
      end
    end