For all ECR repositories, delete all images except the 2 newest.

delete_ecr_matching_a_prefix.sh

python3 - <<EOF
import boto3

ecr = boto3.client('ecr')
repo_prefix = "dev-"

# Paginate through repositories
paginator = ecr.get_paginator('describe_repositories')
for page in paginator.paginate():
    for repo in page['repositories']:
        repo_name = repo['repositoryName']
        if repo_name.startswith(repo_prefix):
            print(f"Processing repository: {repo_name}")

            # Paginate through images in the repository
            image_paginator = ecr.get_paginator('list_images')
            for image_page in image_paginator.paginate(repositoryName=repo_name):
                image_ids = image_page.get('imageIds', [])
                if image_ids:
                    print(f"Deleting {len(image_ids)} images from repository: {repo_name}")
                    ecr.batch_delete_image(repositoryName=repo_name, imageIds=image_ids)
            
            # Delete the repository
            print(f"Deleting repository: {repo_name}")
            ecr.delete_repository(repositoryName=repo_name, force=True)
EOF

delete_old_ecr_images.sh

python3 - <<EOF
import boto3

ecr = boto3.client('ecr')

# Paginate through all repositories
paginator = ecr.get_paginator('describe_repositories')
for page in paginator.paginate():
    for repo in page['repositories']:
        repo_name = repo['repositoryName']
        print(f"Processing repository: {repo_name}")

        # Fetch all image IDs across all pages
        image_paginator = ecr.get_paginator('list_images')
        all_images = []
        for image_page in image_paginator.paginate(repositoryName=repo_name):
            all_images.extend(image_page.get('imageIds', []))
        
        # Fetch details of all images
        if all_images:
            image_details = []
            for i in range(0, len(all_images), 100):  # Handle batch limits (100 IDs per request)
                batch = all_images[i:i + 100]
                image_details.extend(
                    ecr.describe_images(repositoryName=repo_name, imageIds=batch).get('imageDetails', [])
                )
            
            # Sort all images by 'imagePushedAt' (newest first)
            image_details.sort(key=lambda img: img.get('imagePushedAt', 0), reverse=True)
            
            # Retain the 2 most recent images and delete the rest
            images_to_delete = image_details[2:] 
            if images_to_delete:
                print(f"Deleting {len(images_to_delete)} older images from repository: {repo_name}")
                for i in range(0, len(images_to_delete), 100):  # Handle batch limits for delete
                    batch_to_delete = images_to_delete[i:i + 100]
                    ecr.batch_delete_image(
                        repositoryName=repo_name,
                        imageIds=[{'imageDigest': img['imageDigest']} for img in batch_to_delete]
                    )
        else:
            print(f"No images found in repository: {repo_name}")
EOF