auto_tag_volumes.sh

#!/bin/bash

# WARNING: Will if instance contains ';' in either tag key or value
# Will fix it later, maybe

id=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)
az=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone/)
region=${az%[a-z]}

IFS=$'\n'

volumes=($(aws --region $region ec2 describe-volumes --filters --filters Name=attachment.instance-id,Values=$id | grep VOLUMES | grep -o "vol-[a-z0-9]*"))
instance_tags=($(aws --region $region ec2 describe-tags --filters "Name=resource-id,Values=$id" --query 'Tags[*].[Key,Value]' --output text | tr '\t' ';'))

for vol in ${volumes[@]}; do
        for tag in ${instance_tags[@]}; do
                aws --region $region ec2 create-tags --resources $vol --tags Key=\"${tag%;*}\",Value=\"${tag#*;}\"
        done
done