A script that will create a Formation template from a CDK script and also create its assets. To be used along side SAM and tsc-watch for real-time lambda updates.

convertCdkToCloudFormationTemplate.sh

#!/bin/bash

# This script is designed to replace the existing cdk.out asset directory used by SAM 
# otherwise a new asset directory will be created that can't be seen by SAM until SAM is re-run.

echo "Creating cdk output directory"
mkdir -p tmp/cdk.out

ASSET_DIRS=($(ls -d1 tmp/cdk.out/asset*))
DIR_COUNT=${#ASSET_DIRS[*]}

echo "Checking existing asset directories"
if (($DIR_COUNT > 1)); then
	rm -Rf ./tmp/cdk.out/asset*
	
	echo "Too many asset directories found in ./tmp/cdk.out/"
	echo "All asset directories have now been removed"
	echo "Please quit SAM (CTRL + C) and re-run \`yarn start\`"

	exit 0
fi

if [ -n "$ASSET_DIRS" ]; then
	FIRST_ASSET_DIR=${ASSET_DIRS[0]}
	
	echo "Removing existing asset directory"
	rm -Rf ./tmp/cdk.out/asset*
	
	echo "Running \`cdk synth\` which generated a new asset directory"
	cdk synth --output "tmp/cdk.out" --no-staging > tmp/cdk.out/template.yml
	
	ASSET_DIRS=($(ls -d1 tmp/cdk.out/asset*))
	NEW_ASSET_DIR=${ASSET_DIRS[0]}
	
	echo "Moving new asset directory back to the original location"
	echo $FIRST_ASSET_DIR
	echo $NEW_ASSET_DIR
	
	mv $NEW_ASSET_DIR $FIRST_ASSET_DIR

else
	cdk synth --output "tmp/cdk.out" --no-staging > tmp/cdk.out/template.yml
fi

echo "Completed \`cdk synth\` successfuly"