cloudstack_archlinux/cloudstack/cloudstack-agent.install

post_install() {

  # Generate mandatory GUID value
  GUID=$(uuidgen)
  FILE="/etc/cloudstack/agent/agent.properties"
  if [[ ! $(cat "${FILE}" | sed -nr 's/^guid=(.*)/\1/p') ]]; then
    sed -i -r "s/^(guid=)/\1$GUID/" "${FILE}"
  fi

  # Generate mandatory UUID value
  UUID=$(uuidgen)
  if [[ ! $(cat "${FILE}" | sed -nr 's/^local\.storage\.uuid=(.*)/\1/p') ]]; then
    sed -i -r "s/^(local\.storage\.uuid=)/\1$UUID/" "${FILE}"
  fi
}

#post_upgrade() {
#}