List gitlab container registry size, per project, via gitlab API

index.py

import gitlab
import urllib3
import humanfriendly
import timeago, datetime

# 2020-04-24T12:04:26.475+00:00
date_now = datetime.datetime.now()

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

gl = gitlab.Gitlab('https://git.XXXXXXX', private_token='XXXX', ssl_verify=False)

projects = gl.projects.list(per_page=20, simple=True, pagination="keyset", order_by="id", as_list=False)

for project in projects:
    repositories = project.repositories.list()

    if len(repositories) > 0:
       print(f"# {project.name_with_namespace}")

    total_images = 0
    total_per_project = 0

    for repository in repositories:
        print(f"## {repository.path}")

        tags = repository.tags.list()

        for tag in tags:
            tag_detail = repository.tags.get(tag.name)
            date_time_obj = datetime.datetime.strptime(tag_detail.created_at, '%Y-%m-%dT%H:%M:%S.%f%z').replace(tzinfo=None)

            print(f"### {tag.name} | {humanfriendly.format_size(tag_detail.total_size)} | {timeago.format(date_time_obj, date_now)} ({tag_detail.created_at})")

            total_per_project += tag_detail.total_size
            total_images += 1

    if total_per_project > 0:
        print(f" * Total = {total_images} image(s) for {humanfriendly.format_size(total_per_project)} *")
        print()

run.sh

pip install humanfriendly
pip install python-gitlab
pip install timeago

python index.py