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query whether hash / defrag transfer item content

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难度
5/5
预计耗时
一周以上
新手友好度
35/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
python

调研方向

Start at the Store.hash and Store.defrag operations and trace their implementations across the posixfs, rest, sftp, s3, and rclone backends. Define and test the requested transfer query against the behavior in the table, including the algorithm-dependent sftp check-file probing; done means callers can determine whether item content will transfer.

由索引模型根据 Issue 内容生成。

描述

borg compact copies packs with Store.defrag. borgbackup/borg#10410 needs a Store.hash check of each source pack before the copy. Whether that check is cheap depends on the backend, and the caller cannot tell which case applies.

"Transfer" below means the item content goes over the network between the storage and the borgstore client.

backend hash defrag
posixfs no transfer (local file read) no transfer
rest no transfer (computed by borg serve --rest) no transfer
sftp no transfer if the server supports the check-file extension (OpenSSH does not; never for blake3), otherwise downloads the item downloads the source ranges, uploads the target
s3, rclone downloads the item downloads the source ranges, uploads the target

Request: a way to ask the store whether an operation transfers item content, e.g.

Store.transfers_content(op: str, algorithm: str | None = None) -> bool  # op: "hash", "defrag"

algorithm is needed because sftp check-file does not support blake3. For sftp hash, check_file_supported is only known after the first check-file attempt, so the query has to probe or return True until it is confirmed.

主要语言
Python
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26
派生
9
平均合并
2 小时 22 分钟
30 天内合并 PR
12

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