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ngclient: support `StorageBackendInterface`?

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評估

難度
5/5
預估耗時
一週以上
新手友好度
30/100
Issue 類型
功能
描述清晰度
需要釐清
活躍度
停滯
技術堆疊
python

研究方向

從 tuf/ngclient/updater.py 的第 293-312 行附近開始,將其持久化 repository I/O 與低階中繼資料 API 使用的現有 StorageBackendInterface 進行比較。確定 ngclient 所需的 API 和整合範圍,然後驗證 repository 操作可以在分散式部署中使用非本機儲存。

由索引模型根據 Issue 內容生成。

描述

Description of issue or feature request:

Right now, tuf.ngclient is heavily tied to local system I/O: it assumes a metadata directory on disk that can be read/written. For example:

https://github.com/theupdateframework/python-tuf/blob/4d2ff8d37d30e94dbc0fe2cfa42bd46d2bb72414/tuf/ngclient/updater.py#L293-L312

This is problematic in distributed worker setups like Warehouse (PyPI), where each worker has its own container/entire VM and thus can't easily share on-disk TUF repos. In particular, this causes both reliability and security concerns:

  • Reliability: an unfortunate corruption in a single worker's TUF repo results in a hard-to-diagnose flaky worker, since each worker has its own copy of the repo.
  • Security: each worker's TUF repo is independently stored on a (machine-local) disk, making them harder to audit.

This problem was noted a few years back, before tuf.ngclient was created: https://github.com/theupdateframework/python-tuf/issues/1009. The solution then was to add a filesystem abstraction to the tuf.metadata APIs, which was done via https://github.com/secure-systems-lab/securesystemslib/pull/232 and https://github.com/theupdateframework/python-tuf/issues/1009. However, this abstraction wasn't added to the ngclient APIs, only to the low-level metadata ones.

Current behavior:

tuf.ngclient currently assumes that it can perform persistent local I/O for its repository.

Expected behavior:

tuf.ngclient should support an I/O abstraction (such as the pre-existing StorageBackendInterface, if suitable) for persistent repo operations, enabling use in distributed deployments.

主要語言
Python
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分支
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平均合併
9 小時 25 分鐘
30 天內合併 PR
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從這裡開始

  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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