bash-fu to set AWS instance metadata as environment variables

aws_instance_metadata.bash

#!/bin/bash -x

_JQ_FILTER='.ds | .dynamic | .["instance-identity"] | .document'
_INSTANCE_DATA=/var/run/cloud-init/instance-data.json
export _instance_doc=$(jq "$_JQ_FILTER" $_INSTANCE_DATA)
for key in $(echo $_instance_doc | jq -r 'keys|.[]'); do
  value=$(echo $_instance_doc | jq -r .$key)
  declare -x _AWS_${key^^}=${value}
done