Listing node metadata on ec2 with jclouds

listnodes.groovy

@GrabResolver(name='jclouds snapshot', root='https://oss.sonatype.org/content/repositories/snapshots')
@Grab('org.jclouds:jclouds-allcompute:1.3.0-SNAPSHOT')
import org.jclouds.compute.ComputeServiceContextFactory
      
def accesskeyid = '...'
def secretkey = '...'
def context = new ComputeServiceContextFactory().createContext("aws-ec2", accesskeyid, secretkey)
                                                                
def nodes = context.getComputeService().listNodes()

nodes.each{ println it.userMetadata }