A bash script to signal CloudFormation WaitConditions without cfn-bootstrap

cfn-signal

#!/bin/bash
set -e

## Signal CloudFormation WaitConditions without cfn-bootstrap
## See https://github.com/blake-education/aws-cfn-bootstrap/blob/master/bin/cfn-signal

if [ $# -eq 0 ] ; then
  echo "usage: $0 <cfn url> <last exit code>"
  exit 1
fi

id=$(hostname -f)"_"$(date +"%s%N")
url="$1"
exitcode="${2:-0}"

# json params
status="SUCCESS"
reason="Configuration Complete"
id="llamas"
data="Application has completed configuration."

# check for failure
if [ "$exitcode" -ne 0 ] ; then
  status="FAILURE"
  data="Failed with exit code $exitcode"
fi

echo "notifying $url with $status (from $id)"

# http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-waitcondition.html
curl $url -X PUT -H 'Content-Type:' -d @- <<- JSON
{
   "Status" : "$status",
   "Reason" : "$reason",
   "UniqueId" : "$id",
   "Data" : "$data"
}
JSON