Create Lambda Layer for Python (Multiple Runtimes)

create_lambda_layer.sh

#!/bin/bash

# Expects a requirements.txt in the same folder
# Note: if the package includes NumPy and SciPy, consider defining the package
# and the dependencies that aren't these as they're natively available in Layers

# Supported Docker Images are available here:
# https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-image-repositories.html
layer_versions="python3.8 python3.9"

export PKG_DIR="python"
rm -rf ${PKG_DIR} && mkdir -p ${PKG_DIR}

for version in ${layer_versions[@]}; do
    image="public.ecr.aws/sam/build-${version}"
    docker run -v "$PWD":/var/task $image /bin/sh -c "pip install -r requirements.txt -t python/lib/${version}/site-packages/; exit"
done

zip -qr layer.zip python
sudo rm -rf ${PKG_DIR}