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fix(jsonl): reject unusable roots at plugin load

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A configured root that already exists as a file or unreadable directory cannot host cwd buckets, but the backend previously mounted and deferred that deterministic configuration error until a later list or write.

Probe the resolved root while the plugin loads, surface every error except ENOENT, and keep an absent root valid for lazy first materialization. Document the timing contract, regenerate the config catalog, and pin the non-directory case at the load boundary.
This commit is contained in:
Tianyi Cui
2026-07-20 17:41:40 +08:00
parent 73e3f658c6
commit c9d3d5d557
7 changed files with 28 additions and 15 deletions
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2
packages/session-persistence/session-persistence-jsonl/README.md
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@@ -17,7 +17,7 @@ The JSONL durable session-persistence backend — a concrete `SessionPersistence
| Key | Type | Notes |
|---|---|---|
| `root` | `string` (required) | Root directory for all session files. **No default** — a `process.cwd()` default would scatter files as the process's cwd changes (bash calls, subprocesses). |
| `root` | `string` (required) | Root directory for all session files. **No default** — a `process.cwd()` default would scatter files as the process's cwd changes (bash calls, subprocesses). An existing root must be a readable directory; an absent root is created on first materialization. |
`locate(meta)` returns `{ kind: 'jsonl', path }` using the resolved absolute root and the same cwd-bucket/id encoding as materialization. It performs no filesystem I/O: the target can be returned before the file exists, and an existing file contains only the last flushed prefix.