Get the last commit of a Lambda function in Python

lambda-last-commit.py

#!/usr/bin/env python

import sys
import boto3
import os

def get_lambda_last_commit(arn):
    """Get the commit hash of the last lambda push.

    Keyword arguments:
    arn -- The lambda function arn.
    """

    client = boto3.client('lambda',
        region_name='ap-southeast-2',
        aws_access_key_id=os.environ.get('AWS_ACCESS_KEY_ID'),
        aws_secret_access_key=os.environ.get('AWS_SECRET_ACCESS_KEY')
    )
    response = client.list_tags(Resource=arn)

    if not 'Tags' in response:
        return None
    if not 'vcs-ref' in response['Tags']:
        return None

    return response['Tags']['vcs-ref']


def main():
    arn = sys.argv[1]
    print get_lambda_last_commit(arn)

if __name__ == "__main__":
    main()