code: func untrustedPlatformsWarning(platforms []string) string {
  	if len(ubiquity.Platforms) == 0 {
  		return ubiquityWarning
  	}
  
  	if len(platforms) == 0 {
  		return ""
  	}
  
  	msg := untrustedWarningStub
  	for i, platform := range platforms {
  		if i > 0 {
  			msg += ","
  		}
  		msg += " " + platform
  	}
  	msg += "."
  	return msg
  }
docs: // untrustedPlatformsWarning generates a warning message with untrusted platform names.