setup_tags.sh

#!/bin/bash

set -o errexit
set -o nounset

STACK_NAME=$1
STACKJSON=$(aws cloudformation describe-stacks --stack-name $STACK_NAME)

PARAMS=$(echo $STACKJSON | jq '.Stacks[0].Parameters | del( .[].ParameterValue) | .[]["UsePreviousValue"] = true')

PROJECT=$(echo $STACKJSON | jq -r '.Stacks[0].Parameters[] | select(.ParameterKey == "TagApplication") | .ParameterValue')
ENVIRONMENT=$(echo $STACKJSON | jq -r '.Stacks[0].Parameters[] | select(.ParameterKey == "TagEnvironment") | .ParameterValue')
WORKORDER=$(echo $STACKJSON | jq -r '.Stacks[0].Parameters[] | select(.ParameterKey == "TagWorkOrder") | .ParameterValue')
COSTCENTER=$(echo $STACKJSON | jq -r '.Stacks[0].Parameters[] | select(.ParameterKey == "TagCostCenter") | .ParameterValue')

PROJECT_TAG="Key=Application,Value=$PROJECT"
ENVIRONMENT_TAG="Key=Environment,Value=$ENVIRONMENT"
WORKORDER_TAG="Key=WorkOrder,Value=$WORKORDER"
COSTCENTER_TAG="Key=CostCenter,Value=$COSTCENTER"

aws cloudformation update-stack --stack-name $STACK_NAME --use-previous-template --tags $PROJECT_TAG $ENVIRONMENT_TAG $WORKORDER_TAG $COSTCENTER_TAG --parameters "$PARAMS"

Bash script for updating tags in cloudformation stack.