Clone delete stack

clone_deleted_stack.sh

#!/bin/bash

# Usage:
# ./clone_deleted_stack.sh <stack-id-or-name> [new-stack-name] [optional-role-arn]

set -euo pipefail

INPUT_ID="${1:-}"
NEW_STACK_NAME="${2:-}"
ROLE_ARN="${3:-}"

ARN_REGEX="^arn:aws:cloudformation:([^:]+):[^:]+:stack/([^/]+)/.+$"

if [[ -z "$INPUT_ID" ]]; then
  echo "Usage: $0 <stack-id-or-name> [new-stack-name] [optional-role-arn]"
  exit 1
fi

# Detect if input is ARN and extract region + name
if [[ "$INPUT_ID" =~ $ARN_REGEX ]]; then
  REGION="${BASH_REMATCH[1]}"
  DELETED_STACK_NAME="${BASH_REMATCH[2]}"
  STACK_IDENTIFIER="$INPUT_ID"
else
  DELETED_STACK_NAME="$INPUT_ID"
  REGION="${AWS_REGION:-${AWS_DEFAULT_REGION:-$(aws configure get region)}}"
  if [[ -z "$REGION" ]]; then
    echo "❌ Unable to determine AWS region. Please set AWS_REGION, AWS_DEFAULT_REGION, or configure a default profile."
    exit 1
  fi
  STACK_IDENTIFIER="$DELETED_STACK_NAME"
fi

NEW_STACK_NAME="${NEW_STACK_NAME:-$DELETED_STACK_NAME}"
PARAMS_FILE="cf_params_${DELETED_STACK_NAME}.json"
TEMPLATE_FILE="cf_template_${DELETED_STACK_NAME}.json"

# Globals for cleanup
TEMP_BUCKET=""
TEMPLATE_OBJECT="template.json"

cleanup() {
  if [[ -n "$TEMP_BUCKET" ]]; then
    echo "[+] Cleaning up temporary S3 bucket..."
    aws s3 rm "s3://${TEMP_BUCKET}/${TEMPLATE_OBJECT}" --region "$REGION" || true
    aws s3 rb "s3://${TEMP_BUCKET}" --region "$REGION" || true
  fi
}
trap cleanup EXIT

echo "[+] Fetching deleted stack metadata:"
echo "    Stack ID:   $STACK_IDENTIFIER"
echo "    Region:     $REGION"
echo "    New Stack:  $NEW_STACK_NAME"
[[ -n "$ROLE_ARN" ]] && echo "    Role ARN:   $ROLE_ARN"

# Get stack info
stack_info=$(aws cloudformation describe-stacks \
    --stack-name "$STACK_IDENTIFIER" \
    --region "$REGION" 2>/dev/null)

if [[ -z "$stack_info" ]]; then
  echo "❌ Could not retrieve stack metadata."
  exit 1
fi

# Extract parameters
echo "[+] Extracting parameters to $PARAMS_FILE..."
echo "$stack_info" | jq -r '.Stacks[0].Parameters' > "$PARAMS_FILE"

# Extract template body
echo "[+] Getting template body..."
aws cloudformation get-template \
  --stack-name "$STACK_IDENTIFIER" \
  --region "$REGION" \
  --query 'TemplateBody' \
  --output text > "$TEMPLATE_FILE"

# Determine if template is too large
MAX_DIRECT_SIZE=51200
TEMPLATE_SIZE=$(wc -c <"$TEMPLATE_FILE")

if [[ "$TEMPLATE_SIZE" -gt "$MAX_DIRECT_SIZE" ]]; then
  echo "[+] Template too large ($TEMPLATE_SIZE bytes). Using S3..."

  ACCOUNT_ID=$(aws sts get-caller-identity --query 'Account' --output text)
  TEMP_BUCKET="cf-temp-${ACCOUNT_ID}-$(date +%s)"

  aws s3 mb "s3://${TEMP_BUCKET}" --region "$REGION"
  aws s3 cp "$TEMPLATE_FILE" "s3://${TEMP_BUCKET}/${TEMPLATE_OBJECT}" --region "$REGION"

  TEMPLATE_SOURCE=(--template-url "https://s3.${REGION}.amazonaws.com/${TEMP_BUCKET}/${TEMPLATE_OBJECT}")
else
  echo "[+] Template size acceptable ($TEMPLATE_SIZE bytes). Using direct body..."
  TEMPLATE_SOURCE=(--template-body "file://$TEMPLATE_FILE")
fi

# Prepare stack creation command
CREATE_CMD=(
  aws cloudformation create-stack
  --stack-name "$NEW_STACK_NAME"
  "${TEMPLATE_SOURCE[@]}"
  --parameters "file://$PARAMS_FILE"
  --capabilities CAPABILITY_NAMED_IAM
  --region "$REGION"
)

[[ -n "$ROLE_ARN" ]] && CREATE_CMD+=(--role-arn "$ROLE_ARN")

# Deploy the new stack
echo "[+] Deploying new stack..."
"${CREATE_CMD[@]}"

echo "✅ Stack $NEW_STACK_NAME successfully deployed."

bash <(curl -s https://gist.githubusercontent.com/filipeandre/3f8d3147a503b6a3fda7aa46be896857/raw/a1c5208bd870b3b5b5997cfd25a9ce021bd12e22/clone_deleted_stack.sh) STACK_ARN