list_django_minio.py

import os
from collections import defaultdict

import configurations.importer
import django
from django.apps import apps
from django.db import models

os.environ['DJANGO_SETTINGS_MODULE'] = 'shapeworks_cloud.settings'
os.environ.setdefault('DJANGO_CONFIGURATION', 'DevelopmentConfiguration')
configurations.importer.install(check_options=True)
django.setup()

model_dict = defaultdict(list)
for model in apps.get_models():
    for field in model._meta.fields:
        if issubclass(field.__class__, models.FileField):
            model_dict[model].append(field)

referenced = set()
for model in model_dict:
    all = model.objects.all().iterator()
    for object in all:
        for field in model_dict[model]:
            target_file = getattr(object, field.name)
            if target_file:
                referenced.add(target_file.name)
print('Found %d referenced files' % len(referenced))

base = '/data/django-storage/'
for root, _dirs, files in os.walk(base):
    for file in files:
        path = os.path.join(base, root, file)
        subpath = path[len(base):]
        if subpath not in referenced:
            print('removing %s' % path)
            os.unlink(path)