Append files to a zip inside azure storage container

Question

I have a requirement to write multiple files into azure blob as a zip, files may come any time of the day. I need to append new files to the existing zip file inside the blob.

One option I explored is downloading the existing zip, decompressing, and then compressing with the new file but I feel this is not an ideal scenario.

Is there an option in Azure where we can write files to the same zip without having to download it.

Answer 1

Appending files directly to an existing ZIP file stored in an Azure Blob Storage container isn't natively supported by Azure Blob Storage.

Alternative approaches

• https://josef.codes/azure-storage-zip-multiple-files-using-azure-functions/#:~:text=4,be%20very%20low%20and%20stable

https://josef.codes/azure-storage-zip-multiple-files-using-azure-functions/

• Azure Blob Storage supports append blobs, which are designed for append operations. While this doesn't directly allow appending to a ZIP file, it does provide a way to append data to a blob. Append blobs are similar to block blobs but are optimized for append operations, making them suitable for scenarios like logging data. However, this method would require a different approach to file storage and management, as it doesn't work with ZIP files directly

https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blob-append#:~:text=You%20can%20append%20data%20to,logging%20data%20from%20virtual%20machines

https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blob-append#:~:text=,%E3%80%9013%E2%80%A0AppendBlockAsync%E3%80%91

• Another approach is to use Azure Functions, which can be triggered by events (like a file upload) to perform operations on blobs. This could involve downloading the existing ZIP, adding new files, and re-uploading it. While this approach requires downloading and re-uploading the ZIP file, it can be fully automated using Azure Functions.