in app/packer/PackerOutputParser.scala [18:23]
def parseLine(line: String): Option[PackerEvent] = line match {
case UiOutputRegex(messageType, output) =>
Some(UiOutput(toLogLevel(messageType), parseUiOutput(output)))
case AmiCreatedRegex(amiId) => Some(AmiCreated(AmiId(amiId)))
case _ => None
}