Create a new vm in smartos (I have the brand coded to joyent so it's really only for smartos builds I guess) first argument should be the UUID of the image second is the desired hostname for the new vm and the third is an alias for it.

createNode.sh

#!/bin/bash
export GATEWAY=$(netstat -r | grep default | awk '{ print $2 }')

echo "{
      \"brand\": \"joyent\",
      \"dataset_uuid\": \"$1\",
      \"hostname\": \"$2\",
      \"alias\": \"$3\",
      \"nics\": [
        {
          \"nic_tag\": \"admin\",
          \"ip\": \"dhcp\",
          \"netmask\": \"255.255.255.0\",
          \"gateway\":\"${GATEWAY}\"
        }
      ]
}" | vmadm create