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

I modified that code to include pagination, and to remove the hard coded region:

def check_tag_exists(tag, repo):
    ecr_client = boto3.client('ecr')

    paginator = ecr_client.get_paginator('describe_images')
    response_iterator = paginator.paginate(repositoryName=repo, filter={'tagStatus': 'TAGGED'})

    all_images = []
    for page in response_iterator:
        all_images.extend(page['imageDetails'])

    for image in all_images:
        if tag in image['imageTags']:
            return True
    return False