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Session migration can truncate history if rewrite is interrupted

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还没有人认领这个 Issue。

评估

难度
3/5
预计耗时
1-2 天
新手友好度
70/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
领域
backend, cli, tooling

调研方向

The issue is in packages/coding-agent/src/core/session-manager.ts around line 980. Look at the _rewriteFile() method and the openSync call with mode 'w'. Understand the session migration flow in SessionManager._setSessionFile(). Research Node.js atomic write patterns, like the linked write-file-atomic library. A fix involves writing to a temporary file first, then renaming it over the original on success. Test by creating a v1/v2 session file and simulating an interruption during migration.

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描述

untriaged
What happened?

Opening a v1/v2 session migrates it and rewrites the same JSONL file. _rewriteFile() opens the original with "w", truncating it before writing entries back. If the process or write fails during migration, previously saved history can be left truncated. This is the path in SessionManager._setSessionFile() on current main.

Steps to reproduce
  1. Open an existing v1/v2 session with enough entries to make migration observable.
  2. Interrupt the process after _rewriteFile() opens the original file and before it finishes writing.
  3. Reopen the session: the original file contains only the prefix written before interruption.

This follows directly from openSync(this.sessionFile, "w") in session-manager.ts. I have not observed a production incident.

Expected behavior

Build the complete migrated file in a unique sibling temporary file, flush and close it, then rename it over the original. Keep the original on any error. Node's atomic-write implementation uses this pattern.

Version

main @ cb5fc1456d49d49c62e072bfed2926220083214e

AI-assisted report; source path checked against the stated commit.

主要语言
TypeScript
星标
54
派生
20
平均合并
21 小时 12 分钟
30 天内合并 PR
18

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