user_data_with_trap.sh

#!/bin/bash
AZ=`ec2metadata | grep ^availability-zone | cut -f 2 -d" "`
REGION=`ec2metadata | grep ^availability-zone | cut -f 2 -d" " | sed 's/.$//'`
INSTANCE=`ec2metadata | grep ^instance-id | cut -f 2 -d" "`

trap "echo \"New instance $INSTANCE failed setup\" | \
      /usr/local/bin/gofog sns publish -r ${sns_region} -t ${sns_topic} \
                                  -s \"New instance $INSTANCE failed setup\"" ERR

set -e

# do stuff