List all ec2 that don't have tags defined

check_untagged_ec2.py

import boto3
import csv

def check_ec2_without_tag(tags_key_to_search, session):
    # Initialize the EC2 client using the provided session
    ec2_client = session.client('ec2')

    # Define a dictionary to store instances without the given tag
    instances_without_tag = []

    # Pagination loop to retrieve all instances
    paginator = ec2_client.get_paginator('describe_instances')
    for page in paginator.paginate():
        reservations = page['Reservations']
        for reservation in reservations:
            for instance in reservation['Instances']:
                instance_id = instance['InstanceId']
                tags = instance.get('Tags', [])
                tag_keys = [tag['Key'] for tag in tags]
                # Check if the tag key is not present in the instance's tags
                for tag_key_to_search in tags_key_to_search:
                    if tag_key_to_search not in tag_keys:
                        instances_without_tag.append({'Profile': session.profile_name, 'InstanceID': instance_id, 'Missing': tag_key_to_search, 'Tags': tag_keys})

    return instances_without_tag

def write_to_csv(volumes):
    # Define the CSV file name
    csv_file = 'ec2_without_tags.csv'

    # Write the volumes data to a CSV file
    with open(csv_file, mode='w', newline='') as file:
        fieldnames = ['Profile', 'InstanceID', 'Missing', 'Tags']
        writer = csv.DictWriter(file, fieldnames=fieldnames)

        # Write header
        writer.writeheader()

        # Write each volume's details
        for volume in volumes:
            writer.writerow(volume)

    print(f"Data written to {csv_file}")

def main():
    # Get the list of available profiles from the AWS config file
    session = boto3.Session()
    available_profiles = session.available_profiles

    # Iterate over each profile
    instances_without_tags = []
    for profile_name in available_profiles:
        print(f"Processing profile: {profile_name}")

        # Create a session using the current profile
        session = boto3.Session(profile_name=profile_name)

        tags_key_to_search = ["prima:domain","prima:environment"]

        # Call the function to check EC2 instances without the tag
        instances_without_tag = check_ec2_without_tag(tags_key_to_search, session)

        # Add volumes of this profile to the list
        instances_without_tags.extend(instances_without_tag)

    # Write all unencrypted volumes to CSV
    write_to_csv(instances_without_tags)

if __name__ == "__main__":
    main()