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[Bug]: F-22 Etags longer than 40 characters break scanning

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#65,079 0 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

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评估

难度
2/5
预计耗时
1-3 小时
新手友好度
84/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
php, postgresql
领域
backend, databases

调研方向

从 lib/private/Files/Cache/Cache.php 和 lib/private/Files/Cache/Scanner.php 开始,然后检查现有针对 etags 的单元测试覆盖情况。验证长度超过 varchar(40) 限制的值的处理,并确认扫描同一存储不会反复报告更改。完成的标准是长 etags 不再中止扫描或 PostgreSQL 事务。

由索引模型根据 Issue 内容生成。

描述

0. Needs triage 35-feedback bug
⚠️ This issue respects the following points: ⚠️
  • This is not a troubleshooting question, general support matter, or webserver/proxy problem, but likely a bug (if unsure, ask the Community Help Forum).
  • This issue is not already reported on Github OR solved at the Community Help Forum (I've searched!).
  • I'm using a maintained major version of Nextcloud Server and tested against the latest patch level. (Supported major versions and current patch levels).
  • I agree to follow Nextcloud's Code of Conduct.
  • I've tried my best to provide clear reproduction steps that someone unfamiliar with this bug could use to reproduce it.
Bug description

F-22 · Etags longer than 40 characters break scanning (upstream #55638)

Severity Medium (scan aborts with a database error, on PostgreSQL the transaction fails)
Component lib/private/Files/Cache/Cache.php, lib/private/Files/Cache/Scanner.php
Affects external S3 storages whose server returns SHA-256 based ETags, and any storage with long etags
Upstream https://github.com/nextcloud/server/issues/55638
Verified Unit test; the column limit is etag varchar(40)

SQLSTATE[22001]: String data, right truncated: value too long for type character varying(40) when a
storage reports a 64 character etag.

Fix

Etags longer than 40 characters are stored as their MD5. The scanner applies the same mapping before
comparing, so a rescan does not see a change every time.

Steps to reproduce

see the top

Expected behavior

see the top

Nextcloud Server version

35

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?
  • Default user-backend (database)
  • LDAP/ Active Directory
  • SSO - SAML
  • Other
Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

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