A minimal Django custom storage backend to use GitPython to store revisions to uploaded files and disallow deletes

storage.py

from django.conf import settings
from django.core.files.storage import FileSystemStorage
from django.core.files.base import File
from django.utils.deconstruct import deconstructible

from git import Repo
import io

@deconstructible
class VersionedStorage(FileSystemStorage):
    def __init__(self, option=None):
        super().__init__()
        if not option and hasattr(settings, 'VERSIONED_STORAGE_OPTIONS'):
            option = settings.VERSIONED_STORAGE_OPTIONS
        try:
            self.repo = Repo(path=settings.MEDIA_ROOT)
        except:
            self.repo = Repo.init(path=settings.MEDIA_ROOT)
        
            
    # using FileSystemStorage._open(name, mode)

    def _save(self, name, content):
        saved_name = super()._save(name, content)
        self.repo.index.add(saved_name)
        self.repo.index.commit(name)
        return saved_name
    
    def delete(self, name):
        raise NotImplementedError