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fix: wrap concurrent ENOENT as domain-specific session error (#112)

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Session save_to_path now wraps ENOENT errors from rotate and atomic
write with a clear "possible concurrent modification" message instead
of surfacing raw OS errno. Helps operators debugging race conditions
when multiple claw invocations touch the same session file.

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Co-authored-by: Gajae Code <dev@gajae-code.com>
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bellman
2026-06-05 10:19:43 +09:00
parent c848eeb768
commit 2f0b5b36eb
2 changed files with 26 additions and 3 deletions
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ROADMAP.md
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@@ -3394,7 +3394,7 @@ ear], /color [scheme], /effort [low|medium|high], /fast, /summary, /tag [label],
**Source.** Jobdori dogfood 2026-04-18 against `/tmp/cdHH` on main HEAD `b2366d1` in response to Clawhip pinpoint nudge at `1494872623782301817`. Joins **silent-flag / documented-but-unenforced** (#96–#101, #104, #108) on the command-dispatch-semantics axis — eighth instance of "documented behavior differs from actual." Joins **unplumbed-subsystem / CLI-advertised-but-unreachable** (#78, #96, #100, #102, #103, #107, #109) as the eighth surface where the spec advertises a capability the implementation doesn't deliver. Joins **truth-audit / diagnostic-integrity** (#80–#87, #89, #100, #102, #103, #105, #107, #109, #110) — `/providers` silently returns doctor output under the wrong kind label; help lies about capability. Natural bundle: **#78 + #96 + #111** — three-way "declared but not implemented as declared" triangle (CLI route never constructed + help resume-safe leaks stubs + slash command dispatches to wrong handler). Also **#96 + #108 + #111** — full `--help`/dispatch surface hygiene quartet covering help-filter-leaks + subcommand typo fallthrough + slash-command mis-dispatch. Session tally: ROADMAP #111.
112. **Concurrent claw invocations that touch the same session file (e.g. two `/clear --confirm` or two `/compact` calls on the same session-id race) fail intermittently with a raw OS errno — `{"type":"error","error":"No such file or directory (os error 2)"}` — instead of a domain-specific concurrent-modification error. There is no file locking, no read-modify-write protection, no rename-race guard. The loser of the race gets ENOENT because the winner rotated, renamed, or deleted the session file between the loser's `fs::read_to_string` and its own `fs::write`. A claw orchestrating multiple lanes that happen to share a session id (because the operator reuses one, or because a CI matrix is re-running with the same state) gets unpredictable partial failures with un-actionable raw-io errors** — dogfooded 2026-04-18 on main HEAD `a049bd2` from `/tmp/cdII`. Five concurrent `/compact` calls on the same session: 4 succeed, 1 fails with `os error 2`. Two concurrent `/clear --confirm` calls: same pattern.
112. **DONE — Concurrent claw invocations that touch the same session file (e.g. two `/clear --confirm` or two `/compact` calls on the same session-id race) fail intermittently with a raw OS errno — `{"type":"error","error":"No such file or directory (os error 2)"}` — instead of a domain-specific concurrent-modification error. There is no file locking, no read-modify-write protection, no rename-race guard. The loser of the race gets ENOENT because the winner rotated, renamed, or deleted the session file between the loser's `fs::read_to_string` and its own `fs::write`. A claw orchestrating multiple lanes that happen to share a session id (because the operator reuses one, or because a CI matrix is re-running with the same state) gets unpredictable partial failures with un-actionable raw-io errors** — dogfooded 2026-04-18 on main HEAD `a049bd2` from `/tmp/cdII`. Five concurrent `/compact` calls on the same session: 4 succeed, 1 fails with `os error 2`. Two concurrent `/clear --confirm` calls: same pattern.
**Concrete repro.**
```