deploy-cloudformation.sh

#!/bin/bash
set -e

# Configuration
STACK_NAME="pandoc-lambda-stack"
TEMPLATE_FILE="template.yaml"
AWS_REGION=${AWS_REGION:-"us-east-1"}

# Check if AWS CLI is installed
if ! command -v aws &> /dev/null; then
    echo "AWS CLI not found. Please install it first."
    exit 1
fi

# Check if template file exists
if [ ! -f "${TEMPLATE_FILE}" ]; then
    echo "Template file not found: ${TEMPLATE_FILE}"
    exit 1
fi

# Check if stack exists and get its status
STACK_STATUS=$(aws cloudformation describe-stacks --stack-name ${STACK_NAME} --region ${AWS_REGION} --query "Stacks[0].StackStatus" --output text 2>/dev/null || echo "STACK_DOES_NOT_EXIST")

echo "Current stack status: ${STACK_STATUS}"

# Handle based on stack status
if [ "${STACK_STATUS}" == "STACK_DOES_NOT_EXIST" ]; then
    # Create stack
    echo "Creating CloudFormation stack ${STACK_NAME}..."
    aws cloudformation create-stack \
        --stack-name ${STACK_NAME} \
        --template-body file://${TEMPLATE_FILE} \
        --capabilities CAPABILITY_NAMED_IAM \
        --region ${AWS_REGION}

    echo "Waiting for stack creation to complete..."
    aws cloudformation wait stack-create-complete \
        --stack-name ${STACK_NAME} \
        --region ${AWS_REGION}
elif [ "${STACK_STATUS}" == "ROLLBACK_COMPLETE" ]; then
    # Delete stack if it's in ROLLBACK_COMPLETE state
    echo "Stack is in ROLLBACK_COMPLETE state. Deleting the stack first..."
    aws cloudformation delete-stack \
        --stack-name ${STACK_NAME} \
        --region ${AWS_REGION}
    
    echo "Waiting for stack deletion to complete..."
    aws cloudformation wait stack-delete-complete \
        --stack-name ${STACK_NAME} \
        --region ${AWS_REGION}
    
    # Create new stack
    echo "Creating new CloudFormation stack ${STACK_NAME}..."
    aws cloudformation create-stack \
        --stack-name ${STACK_NAME} \
        --template-body file://${TEMPLATE_FILE} \
        --capabilities CAPABILITY_NAMED_IAM \
        --region ${AWS_REGION}
    
    echo "Waiting for stack creation to complete..."
    aws cloudformation wait stack-create-complete \
        --stack-name ${STACK_NAME} \
        --region ${AWS_REGION}
else
    # Update stack
    echo "Updating CloudFormation stack ${STACK_NAME}..."
    aws cloudformation update-stack \
        --stack-name ${STACK_NAME} \
        --template-body file://${TEMPLATE_FILE} \
        --capabilities CAPABILITY_NAMED_IAM \
        --region ${AWS_REGION} || echo "No updates to be performed."

    echo "Waiting for stack update to complete..."
    aws cloudformation wait stack-update-complete \
        --stack-name ${STACK_NAME} \
        --region ${AWS_REGION}
fi

echo "CloudFormation deployment completed successfully!"