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55d1bbb7bd946ecf21f5625aeabe98cb3f90e1a7
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Commits
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55d1bbb7bd |
feat(cursor): invisible sync-on-open migrator from legacy stream-json to ACP (#844)
* feat(cursor): invisible sync-on-open migrator from legacy stream-json to ACP Closes #824 When the operator reopens a legacy stream-json Cursor session in HAPI, the hub now transparently transplants its `~/.cursor/chats/<wsh>/<uuid>/store.db` into `~/.cursor/acp-sessions/<uuid>/`, verifies it loads via `agent acp`, flips `metadata.cursorSessionProtocol = 'acp'`, and removes the legacy source - all before `resumeSession` returns. Subsequent opens are pure ACP. The primary justification is safety, not feature parity. #784 (`cursor-agent` fabricates `Questions skipped by the user` responses in legacy stream-json mode) still fires regularly in dogfood despite #801's mitigation: the agent ships destructive side effects against fabricated consent. Migration to ACP closes the protocol-level door because the `AskQuestion` tool does not exist on the ACP side, so there is nothing to fabricate. working. That tradeoff was reasonable at the time. The accumulated #784 evidence makes legacy sessions actively unsafe; this PR makes the upgrade path invisible enough that users stop avoiding it. A pre-PR spike established that legacy and ACP `store.db` files use the identical SQLite schema; only the directory layout differs. The migrator therefore: 1. Sanity-checks the source store and pre-flips state (`session.active`, `lifecycleState`, on-disk presence, target collision) 2. Optionally archives a stale-running row (`forceArchiveRunning: true` is the default for the auto-migrate path because the caller already verified `session.active === false`) 3. Atomically creates `~/.cursor/acp-sessions/<uuid>/` with mode `0o700` 4. Copies `store.db` and chmods to `0o600` (multi-user-host hardening) 5. Writes a minimal `meta.json` sidecar (`schemaVersion`, `cwd`, optional `title`) with mode `0o600` 6. Spawns `agent acp` under HAPI_HOME isolation and verifies the session loads via `session/load`. On long histories the verify also drives a trivial single-turn prompt; on short ones load-only is enough 7. Flips `cursorSessionProtocol = 'acp'` AND clears the `cursorMigrationState` banner flag in a SINGLE metadata write 8. Removes the legacy source store (only after verify succeeded and the protocol flip committed). The legacy `~/.cursor/chats` parent dir is left as-is Every failure leaves the legacy state intact. No `rm` fires without a verify success AND a committed protocol flip. The transplant takes 15-20s on long histories (copy a multi-hundred-MB store, spawn `agent acp`, replay thousands of notifications, tear down the probe). Without a progress indicator the wait reads as "broken" to a fresh reviewer. A minimal banner ships alongside the migrator: - Hub sets `metadata.cursorMigrationState = 'in_progress'` BEFORE the long-running transplant. The session-cache refresh emits the existing `session-updated` SSE event (no new event type), so the web client picks it up in milliseconds. No client-side polling needed. - Hub clears the flag in the SAME metadata write that flips `cursorSessionProtocol` to `'acp'` on success, so the banner disappears in the same render tick the chat re-renders as ACP - no flicker window. - Hub clears the flag explicitly in the auto-migrate helper's `finally` on failure/exception, so the banner never gets stuck if migration falls back to the legacy launcher. - Web renders an accessible (role=status, aria-live=polite) banner with an indeterminate spinner. Deliberately no fake percentage - we do not have phase data and a fake progress bar would lie. This PR is intentionally sequenced AFTER swear01's three ACP mop-up PRs (merged today as |