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openspec/archive/2026-04-28-drive-port/proposal.md
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openspec/archive/2026-04-28-drive-port/proposal.md
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# OpenSpec Change: drive-port
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- **Change ID**: drive-port
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- **Package**: `@suaveplan/drive` (new)
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- **Status**: PROPOSED
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- **Date**: 2026-04-28
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## Summary
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Port `@suaveplan/drive` from `../suaveplan/packages/universal/drive` into genesis as a **file-VFS-only** core. Drive in genesis exposes paths and bytes — `read`, `write`, `delete`, `stat`, `list`, `createReadStream`, `createWriteStream` — backed by `AbstractStorage` from `@suaveplan/storage`. Chunking, P2P mesh sync, transports, and `transfer()`-style cross-drive copy live in **separate packages** that consume drive via its plugin API. There is no `StorageAdapter` shim — drive sits directly on `AbstractStorage`. Constructor accepts a storage instance directly; `Drive.initialize()` calls `storage.connect()` for storages drive owns; `Drive.dispose()` closes only those it opened.
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## Why this is file-only
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The previous draft of this proposal carried chunks, `transfer()` / manager, and capability-aware streaming all in one package. Discussion this session split those into:
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| Concern | Package | Layer |
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| --- | --- | --- |
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| File VFS (paths, bytes, metadata, plugin slot) | `@suaveplan/drive` | this change |
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| Random-access offset writes on storage | `@suaveplan/storage` (`setPartial`) | `storage-set-partial` |
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| Chunk format, manifest, packer, sig-verify gate | `@suaveplan/drive-plugin-chunks` | `drive-plugin-chunks-port` |
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| Peer index, availability gossip, parallel pull | `@suaveplan/drive-mesh` | `drive-mesh-port` |
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| Wire — HTTPS / WebRTC / libp2p / SMB-as-storage | `@suaveplan/drive-transport-*` | per transport |
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Drive proper does **not** know about chunks, peers, signatures, or wires. It is a thin file abstraction over storage with a plugin slot.
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## Current state
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- Source `@suaveplan/drive` v1.1.1 (`../suaveplan/packages/universal/drive`): ~7 300 LOC, 127 files, ships only `MemoryStorage`, has its own incompatible `StorageAdapter` interface.
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- Genesis `AbstractStorage` (`packages/storage/storage/src/abstract/abstract.ts:56`) already declares `getPartial`, `getItemSize`, `createReadStream`, `createWriteStream` as abstract — the `MIGRATION.md` §6.3 storage-bridge work is already done. No `StorageProviderAdapter` shim is created.
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## What changes
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### 1. Storage contract — `DriveStorage` is structural
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`Drive` consumes `AbstractStorage` directly. `DriveStorage` is a structural view that adds an `id: string`, optional `capabilities`, and optional `connect`/`dispose`/`isConnected` lifecycle hooks. See `storage-adapter-sketch.md` in this folder for the full TypeScript sketch.
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### 2. Constructor overloads
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```ts
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new Drive() // empty, attach storages later
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new Drive(storage) // bare AbstractStorage, registered as id "default"
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new Drive(storage, options) // storage + options
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new Drive({ defaultStorage, plugins, ... }) // options-only form
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```
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`new Drive(storage)` is sugar for `new Drive({ defaultStorage: storage })` — observably equivalent.
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### 3. Lifecycle ownership
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`Drive.initialize()` walks `this.storages` and calls `storage.connect?.()` only when `storage.isConnected?.() !== true`. Storages drive itself connects are tracked in `connectedByMe: WeakSet<DriveStorage>`. `Drive.dispose()` closes only those — pre-connected storages passed in by the caller are left open. Both `initialize` and `dispose` are idempotent.
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### 4. Plugin slot
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```ts
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interface DrivePlugin<THandle = void> {
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readonly name: string;
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install(drive: Drive): THandle | Promise<THandle>;
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dispose?(): void | Promise<void>;
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}
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const chunks = drive.use(chunksPlugin({ packer, serverPubKey }));
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// drive.* — file-level
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// chunks.* — chunk-level (via the plugin's returned handle)
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```
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`drive.use(plugin)` returns the plugin's typed handle. Drive's own type surface stays file-level; plugins extend functionality through their handles, not through module augmentation.
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Plugins also register middleware on drive's file ops (`read`, `write`, `delete`, `stat`, `list`) via `drive.useMiddleware(...)`. Middleware execute outer-first on request, outer-last on response; `plugin.dispose()` runs in reverse-registration order on `Drive.dispose()`.
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### 5. Generics
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```ts
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class Drive<TStorageMap extends Record<string, DriveStorage> = Record<string, DriveStorage>> {
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use<K extends string, S extends DriveStorage>(id: K, storage: S):
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Drive<TStorageMap & Record<K, S>>;
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getStorage<K extends keyof TStorageMap & string>(id: K): TStorageMap[K];
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}
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```
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Storage IDs are typed end-to-end. Calls with an unknown id are a TypeScript error.
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### 6. Module-augmentation factories
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`StorageFactory.register('file', FileSystem)` (already in `@suaveplan/storage`) is the single registration point. `Drive.fromConfig({ storage: { type: 'file', config: { ... } } })` resolves through `StorageFactory`. Drive does not maintain a separate adapter registry.
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### 7. Error codes
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`DRIVE_CODES = defineCodes("DRIVE", [NOT_INITIALIZED, DISPOSED, STORAGE_CONNECT_FAILED, STORAGE_NOT_FOUND, IO_FAILED, INVALID_PATH, PLUGIN_FAILED] as const)`. `DriveError extends SuaveplanError<DriveErrorCode>`. Frozen registry.
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### 8. Error handling boundaries
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- `storage.connect()` errors → `DriveError(DRIVE.STORAGE_CONNECT_FAILED, { cause })`
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- ops on disposed drive → `DriveError(DRIVE.DISPOSED)`
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- ops before `initialize()` → `DriveError(DRIVE.NOT_INITIALIZED)`
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- `getStorage("nope")` → `DriveError(DRIVE.STORAGE_NOT_FOUND)`
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- plugin install/dispose throw → `DriveError(DRIVE.PLUGIN_FAILED, { cause })`
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## Impact
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- New package `packages/drive/drive/` at `0.1.0`.
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- New OpenSpec capability `drive` at `openspec/specs/drive/spec.md`.
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- No changes to `@suaveplan/storage` (the `setPartial` addition is `storage-set-partial`, a separate change).
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## Out of scope (covered by sibling changes)
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- Chunk format, manifest, packer integration → `drive-plugin-chunks-port`
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- Sparse-file storage layout → requires `storage-set-partial`
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- Mesh peer index / parallel pull → `drive-mesh-port`
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- Wire transports → `drive-transport-https-port`, `drive-transport-webrtc-port`
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- `transfer()` / `DriveManager` cross-drive copy → deferred; mesh subsumes most of it
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- `@suaveplan/drive-sharing` port → separate change
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- `@suaveplan/vault` orchestration layer → separate change after drive lands
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