AWS Lambda bash CLI with own Docker container image

bootstrap.sh

#!/usr/bin/env bash

# https://docs.aws.amazon.com/ja_jp/lambda/latest/dg/runtimes-walkthrough.html

set -euo pipefail

# Initialization - load function handler
source $LAMBDA_TASK_ROOT/"$(echo $_HANDLER | cut -d. -f1).sh"

# Processing
while true
do
  HEADERS="$(mktemp)"
  # Get an event. The HTTP request will block until one is received
  EVENT_DATA=$(curl -sS -LD "$HEADERS" -X GET "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/next")

  # Extract request ID by scraping response headers received above
  REQUEST_ID=$(grep -Fi Lambda-Runtime-Aws-Request-Id "$HEADERS" | tr -d '[:space:]' | cut -d: -f2)

  # Run the handler function from the script
  RESPONSE=$($(echo "$_HANDLER" | cut -d. -f2) "$EVENT_DATA")

  # Send the response
  curl -X POST "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/$REQUEST_ID/response"  -d "$RESPONSE"
done

Dockerfile

FROM debian:trixie-slim

ENV LAMBDA_TASK_ROOT=/var/task
ENV LAMBDA_RUNTIME_DIR=/var/runtime

RUN apt update && apt install -y curl unzip groff jq \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

# Install AWS CLI
RUN curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" \
    && unzip awscliv2.zip \ 
    && ./aws/install \
    && rm awscliv2.zip

COPY bootstrap.sh ${LAMBDA_RUNTIME_DIR}/bootstrap.sh
COPY something.sh ${LAMBDA_TASK_ROOT}/something.sh

ENTRYPOINT [ "/var/runtime/bootstrap.sh" ]
CMD [ "something.handler" ]

somthing.sh

#!/usr/bin/env bash

set -eu

# this function will be called.
function handler () {
  echo "{\"statusCode\": 200, \"body\": \"success\"}"
}