Get all EC2 tags and set them as Bash variables

ec2_tags_as_bash_variables.sh

#!/bin/bash
#
# EC2 tags to variables
# Copyright (c) Alexey Baikov <sysboss[at]mail.ru>
#
# Description:
# Gets all EC2 tags and converts them to Bash variables
# Based on 'jq' (https://stedolan.github.io/jq/)

INSTANCE_REGION="$(curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | grep region | tr -d ' ' | cut -f2 -d: | tr -d '"' | tr -d ',')"
INSTANCE_ID="$(curl -s http://169.254.169.254/latest/meta-data/instance-id)"

TAGS=$(aws ec2 describe-tags \
        --filters "Name=resource-id,Values=${INSTANCE_ID}" \
        --region ${INSTANCE_REGION})
COUNT=$(expr $(echo "${TAGS}" | jq '.Tags | length') - 1)

function getTagKey() {
    echo "${TAGS}" | jq ".Tags[$1][\"Key\"]" | tr -d '"' | sed 's/:/_/g'
}

function getTagValue() {
    echo "${TAGS}" | jq ".Tags[$1][\"Value\"]" | tr -d '"' | sed 's/:/_/g'
}

# run on each tag and
# declare it as environment variables
for i in $(seq 0 ${COUNT}); do
  # set Key=Value
  declare "$(getTagKey $i)=$(getTagValue $i)"
done

# Usage example:
#   echo ${Name}
#   echo ${aws_autoscaling_groupName}