A simple Python function to check if an image tag exists in an ECR repo using boto3

check_tag_exists.py

# Checks if an image tag exists in the repo
def check_tag_exists(tag, repo):
    ecr_client = boto3.client('ecr', region_name='us-east-1')
    response = ecr_client.describe_images(repositoryName=repo, filter={'tagStatus': 'TAGGED'})
    for i in response['imageDetails']:
        if tag in i['imageTags']:
            return True
    return False

This does not handle pagination, if there are more than 100 images in your repo this might fail