| 1 | package session |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha256" |
| 6 | "encoding/hex" |
| 7 | "encoding/json" |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "io" |
| 11 | "io/fs" |
| 12 | "os" |
| 13 | "path/filepath" |
| 14 | "sort" |
| 15 | "strings" |
| 16 | "sync" |
| 17 | "time" |
| 18 | |
| 19 | "reasonix/internal/agent" |
| 20 | "reasonix/internal/fileutil" |
| 21 | filelock "reasonix/internal/identitylock" |
| 22 | "reasonix/internal/provider" |
| 23 | "reasonix/internal/store" |
| 24 | ) |
| 25 | |
| 26 | type MigrationMapping struct { |
| 27 | SchemaVersion int `json:"schemaVersion"` |
| 28 | Entries []MigrationEntry `json:"entries"` |
| 29 | } |
| 30 | |
| 31 | type MigrationEntry struct { |
| 32 | SourcePath string `json:"sourcePath"` |
| 33 | SourceSize int64 `json:"sourceSize"` |
| 34 | SourceSHA256 string `json:"sourceSha256"` |
| 35 | LegacyHeadID string `json:"legacyHeadId,omitempty"` |
| 36 | TargetCodec string `json:"targetCodec"` |
| 37 | TargetID string `json:"targetId"` |
| 38 | CreatedAt time.Time `json:"createdAt"` |
| 39 | } |
| 40 | |
| 41 | type MigrationResult struct { |
| 42 | TargetID string |
| 43 | TargetDir string |
| 44 | Source Source |
| 45 | Reused bool |
| 46 | MessageNum int |
| 47 | } |
| 48 | |
| 49 | var migrationMu sync.Mutex |
| 50 | |
| 51 | // MigrateLegacy freezes one legacy session under its write lease, constructs a |
| 52 | // complete canonical directory in a sibling temporary directory, then publishes it by |
| 53 | // rename. Original artifacts are copied byte-for-byte under legacy/ and are |
| 54 | // never rewritten or removed. |
| 55 | func MigrateLegacy(ctx context.Context, sourcePath, targetRoot string) (MigrationResult, error) { |
| 56 | return MigrateLegacyHead(ctx, sourcePath, targetRoot, "") |
| 57 | } |
| 58 | |
| 59 | // MigrateLegacyHead turns one reachable legacy DAG head into its own canonical |
| 60 | // session. An empty head ID imports the legacy file's selected/default view. |
| 61 | // Head identity participates in both the deterministic target ID and migration |
| 62 | // map key, so continuing two old heads can never merge their future writes. |
| 63 | func MigrateLegacyHead(ctx context.Context, sourcePath, targetRoot, legacyHeadID string) (MigrationResult, error) { |
| 64 | return migrateLegacyHead(ctx, sourcePath, targetRoot, legacyHeadID, false) |
| 65 | } |
| 66 | |
| 67 | // migrateLegacyHeadForHost permits an existing host transition to freeze a |
| 68 | // legacy source already leased by this process. Cross-process ownership is |
| 69 | // still enforced by the OS lease. Callers must serialize the transition with |
| 70 | // their host/session gate and stop the old producer before invoking it. |
| 71 | func migrateLegacyHeadForHost(ctx context.Context, sourcePath, targetRoot, legacyHeadID string) (MigrationResult, error) { |
| 72 | return migrateLegacyHead(ctx, sourcePath, targetRoot, legacyHeadID, true) |
| 73 | } |
| 74 | |
| 75 | func migrateLegacyHead(ctx context.Context, sourcePath, targetRoot, legacyHeadID string, allowCurrentOwner bool) (MigrationResult, error) { |
| 76 | targetRoot = filepath.Clean(strings.TrimSpace(targetRoot)) |
| 77 | if targetRoot == "." { |
| 78 | return MigrationResult{}, fmt.Errorf("session: source and target root are required") |
| 79 | } |
| 80 | frozen, err := freezeLegacyHead(ctx, sourcePath, legacyHeadID, allowCurrentOwner) |
| 81 | if err != nil { |
| 82 | return MigrationResult{}, err |
| 83 | } |
| 84 | return frozen.publish(ctx, targetRoot, CreateOptions{}) |
| 85 | } |
| 86 | |
| 87 | // frozenLegacyHead is one legacy head reduced to an immutable, already-parsed |
| 88 | // migration input. Nothing is published while it is being built, so a caller |
| 89 | // that must compare it against a paired event sidecar can still refuse the |
| 90 | // import without leaving a partially-adopted target behind. |
| 91 | type frozenLegacyHead struct { |
| 92 | sourcePath string |
| 93 | headID string |
| 94 | source Source |
| 95 | artifacts []frozenArtifact |
| 96 | targetID string |
| 97 | messageSpool string |
| 98 | messageCount int |
| 99 | modelRef string |
| 100 | modelIdentity string |
| 101 | modelMessages []provider.Message |
| 102 | projectionDiagnostic string |
| 103 | goal map[string]any |
| 104 | freezeDir string |
| 105 | } |
| 106 | |
| 107 | // LegacyMigrationHeads lists all heads from an immutable copy, without changing |
| 108 | // source selection, caches, or logs. Retired heads are returned for the caller |
| 109 | // to distinguish deliberate deletion from a missing branch. |
| 110 | func LegacyMigrationHeads(ctx context.Context, sourcePath string) ([]agent.SessionHead, error) { |
| 111 | sourcePath = agent.CanonicalSessionPath(sourcePath) |
| 112 | lease, err := agent.TryAcquireSessionLease(sourcePath) |
| 113 | if err != nil { |
| 114 | return nil, err |
| 115 | } |
| 116 | artifacts, _, dir, err := freezeLegacyArtifacts(ctx, sourcePath) |
| 117 | lease.Release() |
| 118 | if err != nil { |
| 119 | return nil, err |
| 120 | } |
| 121 | defer os.RemoveAll(dir) |
| 122 | for _, artifact := range artifacts { |
| 123 | if artifact.path == sourcePath { |
| 124 | return agent.ListSessionHeadsForMigration(ctx, artifact.frozenPath) |
| 125 | } |
| 126 | } |
| 127 | return nil, os.ErrNotExist |
| 128 | } |
| 129 | |
| 130 | // freezeLegacyHead acquires the source lease, copies every durable artifact |
| 131 | // byte-for-byte, then parses only the frozen copy. The lease is released before |
| 132 | // parsing, which is safe precisely because the parse never reads the original. |
| 133 | func freezeLegacyHead(ctx context.Context, sourcePath, legacyHeadID string, allowCurrentOwner bool) (*frozenLegacyHead, error) { |
| 134 | if err := ctx.Err(); err != nil { |
| 135 | return nil, err |
| 136 | } |
| 137 | sourcePath = agent.CanonicalSessionPath(sourcePath) |
| 138 | legacyHeadID = strings.TrimSpace(legacyHeadID) |
| 139 | if sourcePath == "" { |
| 140 | return nil, fmt.Errorf("session: source is required") |
| 141 | } |
| 142 | var lease *agent.SessionLease |
| 143 | if !allowCurrentOwner || !agent.SessionLeaseHeldByCurrentRuntime(sourcePath) { |
| 144 | acquired, acquireErr := agent.TryAcquireSessionLease(sourcePath) |
| 145 | if acquireErr != nil { |
| 146 | return nil, fmt.Errorf("freeze legacy session: %w", acquireErr) |
| 147 | } |
| 148 | lease = acquired |
| 149 | } |
| 150 | artifacts, source, freezeDir, err := freezeLegacyArtifacts(ctx, sourcePath) |
| 151 | if lease != nil { |
| 152 | lease.Release() |
| 153 | } |
| 154 | if err != nil { |
| 155 | return nil, err |
| 156 | } |
| 157 | source.LegacyHeadID = legacyHeadID |
| 158 | parsed, err := parseFrozenLegacy(ctx, artifacts, sourcePath, legacyHeadID) |
| 159 | if err != nil { |
| 160 | _ = os.RemoveAll(freezeDir) |
| 161 | return nil, err |
| 162 | } |
| 163 | return &frozenLegacyHead{ |
| 164 | sourcePath: sourcePath, headID: legacyHeadID, source: source, artifacts: artifacts, |
| 165 | targetID: migrationTargetID(sourcePath, source.SHA256, legacyHeadID), |
| 166 | messageSpool: parsed.messageSpool, messageCount: parsed.messageCount, |
| 167 | modelRef: parsed.modelRef, modelIdentity: parsed.modelIdentity, |
| 168 | modelMessages: parsed.modelMessages, projectionDiagnostic: parsed.projectionDiagnostic, |
| 169 | goal: parsed.goal, |
| 170 | freezeDir: freezeDir, |
| 171 | }, nil |
| 172 | } |
| 173 | |
| 174 | type frozenLegacyParse struct { |
| 175 | messageSpool string |
| 176 | messageCount int |
| 177 | modelRef string |
| 178 | modelIdentity string |
| 179 | modelMessages []provider.Message |
| 180 | projectionDiagnostic string |
| 181 | goal map[string]any |
| 182 | } |
| 183 | |
| 184 | // parseFrozenLegacy reads the frozen artifacts from a private directory so the |
| 185 | // published target can never depend on bytes outside the frozen input. |
| 186 | func parseFrozenLegacy(ctx context.Context, artifacts []frozenArtifact, sourcePath, legacyHeadID string) (frozenLegacyParse, error) { |
| 187 | if len(artifacts) == 0 { |
| 188 | return frozenLegacyParse{}, os.ErrNotExist |
| 189 | } |
| 190 | if err := ctx.Err(); err != nil { |
| 191 | return frozenLegacyParse{}, err |
| 192 | } |
| 193 | frozenSourcePath := "" |
| 194 | for _, artifact := range artifacts { |
| 195 | if artifact.path == sourcePath { |
| 196 | frozenSourcePath = artifact.frozenPath |
| 197 | break |
| 198 | } |
| 199 | } |
| 200 | if frozenSourcePath == "" { |
| 201 | return frozenLegacyParse{}, os.ErrNotExist |
| 202 | } |
| 203 | messageSpool := filepath.Join(filepath.Dir(frozenSourcePath), ".migration-messages.jsons") |
| 204 | spool, err := os.OpenFile(messageSpool, os.O_CREATE|os.O_TRUNC|os.O_RDWR, 0o600) |
| 205 | if err != nil { |
| 206 | return frozenLegacyParse{}, err |
| 207 | } |
| 208 | encoder := json.NewEncoder(spool) |
| 209 | reset := func() error { |
| 210 | if err := spool.Truncate(0); err != nil { |
| 211 | return err |
| 212 | } |
| 213 | _, err := spool.Seek(0, io.SeekStart) |
| 214 | return err |
| 215 | } |
| 216 | emit := func(message provider.Message) error { return encoder.Encode(message) } |
| 217 | stream, streamErr := agent.StreamSessionMessagesForMigration(ctx, frozenSourcePath, legacyHeadID, reset, emit) |
| 218 | if streamErr == nil { |
| 219 | streamErr = spool.Sync() |
| 220 | } |
| 221 | closeErr := spool.Close() |
| 222 | if streamErr != nil { |
| 223 | return frozenLegacyParse{}, fmt.Errorf("read legacy transcript: %w", streamErr) |
| 224 | } |
| 225 | if closeErr != nil { |
| 226 | return frozenLegacyParse{}, closeErr |
| 227 | } |
| 228 | parsed := frozenLegacyParse{messageSpool: messageSpool, messageCount: stream.Messages} |
| 229 | if _, err := os.Stat(agent.ContextStatePath(frozenSourcePath)); err == nil { |
| 230 | canonical, loadErr := readMigrationMessageSpool(ctx, messageSpool) |
| 231 | if loadErr != nil { |
| 232 | return frozenLegacyParse{}, loadErr |
| 233 | } |
| 234 | modelMessages, valid, projectionErr := agent.LoadValidContextProjectionForMigration(frozenSourcePath, canonical) |
| 235 | switch { |
| 236 | case projectionErr != nil: |
| 237 | parsed.projectionDiagnostic = "legacy context projection ignored: " + projectionErr.Error() |
| 238 | case valid: |
| 239 | parsed.modelMessages = provider.ModelMessages(modelMessages) |
| 240 | default: |
| 241 | parsed.projectionDiagnostic = "legacy context projection ignored: sidecar does not match canonical history" |
| 242 | } |
| 243 | } else if !os.IsNotExist(err) { |
| 244 | return frozenLegacyParse{}, err |
| 245 | } |
| 246 | if modelRef, modelIdentity, ok := agent.LoadSessionModelSelection(frozenSourcePath); ok && strings.TrimSpace(modelRef) != "" { |
| 247 | parsed.modelRef, parsed.modelIdentity = strings.TrimSpace(modelRef), strings.TrimSpace(modelIdentity) |
| 248 | } |
| 249 | parsed.goal = sanitizedLegacyGoal(frozenSourcePath) |
| 250 | return parsed, nil |
| 251 | } |
| 252 | |
| 253 | func readMigrationMessageSpool(ctx context.Context, path string) ([]provider.Message, error) { |
| 254 | file, err := os.Open(path) |
| 255 | if err != nil { |
| 256 | return nil, err |
| 257 | } |
| 258 | defer file.Close() |
| 259 | decoder := json.NewDecoder(&contextReader{ctx: ctx, reader: file}) |
| 260 | var messages []provider.Message |
| 261 | for { |
| 262 | var message provider.Message |
| 263 | if err := decoder.Decode(&message); errors.Is(err, io.EOF) { |
| 264 | return messages, nil |
| 265 | } else if err != nil { |
| 266 | return nil, err |
| 267 | } |
| 268 | messages = append(messages, message) |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | // publish materializes the frozen input as the deterministic final target. The |
| 273 | // directory is built in a sibling temporary path and atomically renamed, so a |
| 274 | // reader never observes a partial session. |
| 275 | func (f *frozenLegacyHead) publish(ctx context.Context, targetRoot string, options CreateOptions) (MigrationResult, error) { |
| 276 | if f == nil { |
| 277 | return MigrationResult{}, fmt.Errorf("session: nil frozen legacy head") |
| 278 | } |
| 279 | defer os.RemoveAll(f.freezeDir) |
| 280 | targetDir := filepath.Join(targetRoot, f.targetID) |
| 281 | result := MigrationResult{TargetID: f.targetID, TargetDir: targetDir, Source: f.source, MessageNum: f.messageCount} |
| 282 | |
| 283 | migrationMu.Lock() |
| 284 | defer migrationMu.Unlock() |
| 285 | if err := ctx.Err(); err != nil { |
| 286 | return MigrationResult{}, err |
| 287 | } |
| 288 | reused, err := f.reusePublished(ctx, targetRoot, targetDir, options) |
| 289 | if err != nil { |
| 290 | return MigrationResult{}, err |
| 291 | } |
| 292 | if reused { |
| 293 | result.Reused = true |
| 294 | return result, nil |
| 295 | } |
| 296 | if err := os.MkdirAll(targetRoot, 0o700); err != nil { |
| 297 | return MigrationResult{}, err |
| 298 | } |
| 299 | tmp, err := os.MkdirTemp(targetRoot, "."+f.targetID+".tmp-") |
| 300 | if err != nil { |
| 301 | return MigrationResult{}, err |
| 302 | } |
| 303 | published := false |
| 304 | defer func() { |
| 305 | if !published { |
| 306 | _ = os.RemoveAll(tmp) |
| 307 | } |
| 308 | }() |
| 309 | |
| 310 | manifest := Manifest{SchemaVersion: SchemaVersion, Codec: Codec, StorageRevision: StorageRevision, ContentRoot: sharedContentRoot, SessionID: f.targetID, CreatedAt: time.Now().UTC(), Source: &f.source} |
| 311 | if err := writeImportedManifest(tmp, manifest, options); err != nil { |
| 312 | return MigrationResult{}, err |
| 313 | } |
| 314 | legacyDir := filepath.Join(tmp, "legacy") |
| 315 | for _, artifact := range f.artifacts { |
| 316 | if err := ctx.Err(); err != nil { |
| 317 | return MigrationResult{}, err |
| 318 | } |
| 319 | if err := copyFrozenArtifact(ctx, artifact.frozenPath, filepath.Join(legacyDir, filepath.Base(artifact.path)), artifact.mode); err != nil { |
| 320 | return MigrationResult{}, err |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | target, err := OpenWithOptions(tmp, f.targetID, OpenOptions{ExternalHistory: true}) |
| 325 | if err != nil { |
| 326 | return MigrationResult{}, err |
| 327 | } |
| 328 | appendErr := f.appendMessages(ctx, target) |
| 329 | if appendErr == nil { |
| 330 | appendErr = f.appendMetadata(ctx, target) |
| 331 | } |
| 332 | if appendErr == nil { |
| 333 | _, appendErr = target.Flush(ctx) |
| 334 | } |
| 335 | closeErr := target.Close(ctx) |
| 336 | if appendErr != nil { |
| 337 | return MigrationResult{}, appendErr |
| 338 | } |
| 339 | if closeErr != nil { |
| 340 | return MigrationResult{}, closeErr |
| 341 | } |
| 342 | if err := os.Rename(tmp, targetDir); err != nil { |
| 343 | return MigrationResult{}, fmt.Errorf("publish canonical session: %w", err) |
| 344 | } |
| 345 | published = true |
| 346 | if err := appendMigrationMapping(ctx, targetRoot, MigrationEntry{SourcePath: f.sourcePath, SourceSize: f.source.Size, SourceSHA256: f.source.SHA256, LegacyHeadID: f.headID, TargetCodec: Codec, TargetID: f.targetID, CreatedAt: time.Now().UTC()}); err != nil { |
| 347 | // The target is already complete and deterministically discoverable. A |
| 348 | // later retry repairs the mapping without rebuilding or resending work. |
| 349 | return result, fmt.Errorf("publish migration mapping: %w", err) |
| 350 | } |
| 351 | return result, nil |
| 352 | } |
| 353 | |
| 354 | func (f *frozenLegacyHead) appendMessages(ctx context.Context, target *Session) (err error) { |
| 355 | const messageBatchSize = 128 |
| 356 | spool, err := os.Open(f.messageSpool) |
| 357 | if err != nil { |
| 358 | return err |
| 359 | } |
| 360 | defer func() { err = errors.Join(err, spool.Close()) }() |
| 361 | |
| 362 | decoder := json.NewDecoder(&contextReader{ctx: ctx, reader: spool}) |
| 363 | events := make([]Event, 0, messageBatchSize) |
| 364 | batchNumber := 0 |
| 365 | flush := func() error { |
| 366 | if len(events) == 0 { |
| 367 | return nil |
| 368 | } |
| 369 | _, err := target.Append(ctx, Batch{ |
| 370 | OperationID: fmt.Sprintf("legacy-import:%s:messages:%d", f.source.SHA256, batchNumber), |
| 371 | Events: events, |
| 372 | }) |
| 373 | batchNumber++ |
| 374 | events = make([]Event, 0, messageBatchSize) |
| 375 | return err |
| 376 | } |
| 377 | for { |
| 378 | var message provider.Message |
| 379 | decodeErr := decoder.Decode(&message) |
| 380 | if errors.Is(decodeErr, io.EOF) { |
| 381 | return flush() |
| 382 | } |
| 383 | if decodeErr != nil { |
| 384 | return decodeErr |
| 385 | } |
| 386 | raw, marshalErr := json.Marshal(struct { |
| 387 | Message provider.Message `json:"message"` |
| 388 | }{Message: message}) |
| 389 | if marshalErr != nil { |
| 390 | return marshalErr |
| 391 | } |
| 392 | events = append(events, Event{Kind: "message/complete", Payload: raw}) |
| 393 | if len(events) == messageBatchSize { |
| 394 | if err := flush(); err != nil { |
| 395 | return err |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | func (f *frozenLegacyHead) appendMetadata(ctx context.Context, target *Session) error { |
| 402 | prefix := "legacy-import:" + f.source.SHA256 + ":" |
| 403 | if len(f.modelMessages) > 0 { |
| 404 | event, err := legacyModelContextEvent(f.modelMessages) |
| 405 | if err != nil { |
| 406 | return err |
| 407 | } |
| 408 | if _, err := target.Append(ctx, Batch{OperationID: prefix + "model-context", Events: []Event{event}}); err != nil { |
| 409 | return err |
| 410 | } |
| 411 | } |
| 412 | if f.projectionDiagnostic != "" { |
| 413 | raw, err := json.Marshal(map[string]string{ |
| 414 | "code": "legacy_context_projection_ignored", |
| 415 | "detail": f.projectionDiagnostic, |
| 416 | }) |
| 417 | if err != nil { |
| 418 | return err |
| 419 | } |
| 420 | if _, err := target.Append(ctx, Batch{OperationID: prefix + "projection-diagnostic", Events: []Event{{Kind: "diagnostic", Optional: true, Payload: raw}}}); err != nil { |
| 421 | return err |
| 422 | } |
| 423 | } |
| 424 | if f.modelRef != "" { |
| 425 | raw, err := json.Marshal(map[string]string{"modelRef": f.modelRef, "modelIdentity": f.modelIdentity}) |
| 426 | if err != nil { |
| 427 | return err |
| 428 | } |
| 429 | if _, err := target.Append(ctx, Batch{OperationID: prefix + "model", Events: []Event{{Kind: "session/config", Payload: raw}}}); err != nil { |
| 430 | return err |
| 431 | } |
| 432 | } |
| 433 | if f.goal == nil { |
| 434 | return nil |
| 435 | } |
| 436 | raw, err := json.Marshal(f.goal) |
| 437 | if err != nil { |
| 438 | return err |
| 439 | } |
| 440 | _, err = target.Append(ctx, Batch{OperationID: prefix + "goal", Events: []Event{{Kind: "goal/state", Payload: raw}}}) |
| 441 | return err |
| 442 | } |
| 443 | |
| 444 | func (f *frozenLegacyHead) reusePublished(ctx context.Context, targetRoot, targetDir string, options CreateOptions) (bool, error) { |
| 445 | manifest, err := readManifest(filepath.Join(targetDir, "manifest.json")) |
| 446 | if os.IsNotExist(err) { |
| 447 | return false, nil |
| 448 | } |
| 449 | if err != nil { |
| 450 | return false, err |
| 451 | } |
| 452 | if manifest.Source == nil || manifest.Source.Path != f.sourcePath || manifest.Source.SHA256 != f.source.SHA256 || manifest.Source.LegacyHeadID != f.headID { |
| 453 | return false, fmt.Errorf("session: target %s already exists for different input", f.targetID) |
| 454 | } |
| 455 | if err := validateSessionHeaderForCreate(targetDir, f.targetID, options); err != nil { |
| 456 | return false, err |
| 457 | } |
| 458 | if err := f.repairPublishedProjection(ctx, targetDir); err != nil { |
| 459 | return false, err |
| 460 | } |
| 461 | entry := MigrationEntry{SourcePath: f.sourcePath, SourceSize: f.source.Size, SourceSHA256: f.source.SHA256, LegacyHeadID: f.headID, TargetCodec: Codec, TargetID: f.targetID, CreatedAt: manifest.CreatedAt} |
| 462 | if err := appendMigrationMapping(ctx, targetRoot, entry); err != nil { |
| 463 | return false, fmt.Errorf("repair migration mapping: %w", err) |
| 464 | } |
| 465 | return true, nil |
| 466 | } |
| 467 | |
| 468 | func legacyModelContextEvent(messages []provider.Message) (Event, error) { |
| 469 | raw, err := json.Marshal(map[string]any{ |
| 470 | "messages": provider.ModelMessages(messages), |
| 471 | "reason": "legacy-import-projection", |
| 472 | }) |
| 473 | if err != nil { |
| 474 | return Event{}, err |
| 475 | } |
| 476 | return Event{Kind: "model/context-replace", Payload: raw}, nil |
| 477 | } |
| 478 | |
| 479 | // repairPublishedProjection upgrades a target created by an older importer |
| 480 | // only while every commit still belongs to the deterministic import. Any |
| 481 | // subsequent user or runtime commit makes the target ineligible for mutation. |
| 482 | func (f *frozenLegacyHead) repairPublishedProjection(ctx context.Context, targetDir string) error { |
| 483 | if f == nil || len(f.modelMessages) == 0 { |
| 484 | return nil |
| 485 | } |
| 486 | prefix := "legacy-import:" + f.source.SHA256 + ":" |
| 487 | pristine, hasProjection := true, false |
| 488 | if err := VisitCommits(ctx, targetDir, func(commit Commit) error { |
| 489 | if !strings.HasPrefix(commit.OperationID, prefix) { |
| 490 | pristine = false |
| 491 | } |
| 492 | for _, event := range commit.Events { |
| 493 | if event.Kind == "model/context-replace" || event.Kind == "compaction" { |
| 494 | hasProjection = true |
| 495 | } |
| 496 | } |
| 497 | return nil |
| 498 | }); err != nil { |
| 499 | return err |
| 500 | } |
| 501 | if !pristine || hasProjection { |
| 502 | return nil |
| 503 | } |
| 504 | target, err := OpenWithOptions(targetDir, f.targetID, OpenOptions{ExternalHistory: true}) |
| 505 | if err != nil { |
| 506 | // A live canonical target owns its writer lease. Reuse remains safe, but |
| 507 | // an in-place repair must wait for a later inactive retry. |
| 508 | return nil |
| 509 | } |
| 510 | event, err := legacyModelContextEvent(f.modelMessages) |
| 511 | if err == nil { |
| 512 | _, err = target.Append(ctx, Batch{OperationID: prefix + "model-context", Events: []Event{event}}) |
| 513 | } |
| 514 | if err == nil { |
| 515 | _, err = target.Flush(ctx) |
| 516 | } |
| 517 | return errors.Join(err, target.Close(ctx)) |
| 518 | } |
| 519 | |
| 520 | func writeImportedManifest(dir string, manifest Manifest, options CreateOptions) error { |
| 521 | if err := writeManifest(filepath.Join(dir, "manifest.json"), manifest); err != nil { |
| 522 | return err |
| 523 | } |
| 524 | return writeSessionHeaderForCreate(dir, manifest.SessionID, manifest.CreatedAt, options) |
| 525 | } |
| 526 | |
| 527 | type frozenArtifact struct { |
| 528 | path string |
| 529 | frozenPath string |
| 530 | mode fs.FileMode |
| 531 | size int64 |
| 532 | } |
| 533 | |
| 534 | func freezeLegacyArtifacts(ctx context.Context, sourcePath string) ([]frozenArtifact, Source, string, error) { |
| 535 | freezeDir, err := os.MkdirTemp("", "reasonix-legacy-freeze-") |
| 536 | if err != nil { |
| 537 | return nil, Source{}, "", err |
| 538 | } |
| 539 | keep := false |
| 540 | defer func() { |
| 541 | if !keep { |
| 542 | _ = os.RemoveAll(freezeDir) |
| 543 | } |
| 544 | }() |
| 545 | paths := append([]string{sourcePath}, store.SessionSidecarFiles(sourcePath)...) |
| 546 | seen := map[string]bool{} |
| 547 | artifacts := []frozenArtifact{} |
| 548 | foundSource := false |
| 549 | hash := sha256.New() |
| 550 | var total int64 |
| 551 | for _, path := range paths { |
| 552 | if err := ctx.Err(); err != nil { |
| 553 | return nil, Source{}, "", err |
| 554 | } |
| 555 | path = filepath.Clean(path) |
| 556 | if seen[path] { |
| 557 | continue |
| 558 | } |
| 559 | seen[path] = true |
| 560 | info, err := os.Stat(path) |
| 561 | if os.IsNotExist(err) { |
| 562 | continue |
| 563 | } |
| 564 | if err != nil { |
| 565 | return nil, Source{}, "", err |
| 566 | } |
| 567 | if !info.Mode().IsRegular() { |
| 568 | continue |
| 569 | } |
| 570 | frozenPath := filepath.Join(freezeDir, filepath.Base(path)) |
| 571 | if err := copyFrozenArtifact(ctx, path, frozenPath, info.Mode().Perm()); err != nil { |
| 572 | return nil, Source{}, "", err |
| 573 | } |
| 574 | artifacts = append(artifacts, frozenArtifact{path: path, frozenPath: frozenPath, mode: info.Mode().Perm(), size: info.Size()}) |
| 575 | if path == sourcePath { |
| 576 | foundSource = true |
| 577 | } |
| 578 | } |
| 579 | if !foundSource { |
| 580 | return nil, Source{}, "", os.ErrNotExist |
| 581 | } |
| 582 | sort.Slice(artifacts, func(i, j int) bool { return artifacts[i].path < artifacts[j].path }) |
| 583 | for _, artifact := range artifacts { |
| 584 | name := filepath.Base(artifact.path) |
| 585 | hash.Write([]byte(name)) |
| 586 | hash.Write([]byte{0}) |
| 587 | file, err := os.Open(artifact.frozenPath) |
| 588 | if err != nil { |
| 589 | return nil, Source{}, "", err |
| 590 | } |
| 591 | _, copyErr := copyStreamWithContext(ctx, hash, file) |
| 592 | closeErr := file.Close() |
| 593 | if copyErr != nil || closeErr != nil { |
| 594 | return nil, Source{}, "", errors.Join(copyErr, closeErr) |
| 595 | } |
| 596 | hash.Write([]byte{0}) |
| 597 | total += artifact.size |
| 598 | } |
| 599 | keep = true |
| 600 | return artifacts, Source{Path: sourcePath, Size: total, SHA256: hex.EncodeToString(hash.Sum(nil)), Version: "legacy"}, freezeDir, nil |
| 601 | } |
| 602 | |
| 603 | func copyFrozenArtifact(ctx context.Context, source, target string, mode fs.FileMode) error { |
| 604 | if err := ctx.Err(); err != nil { |
| 605 | return err |
| 606 | } |
| 607 | if err := os.MkdirAll(filepath.Dir(target), 0o700); err != nil { |
| 608 | return err |
| 609 | } |
| 610 | in, err := os.Open(source) |
| 611 | if err != nil { |
| 612 | return err |
| 613 | } |
| 614 | defer in.Close() |
| 615 | tmp, err := os.CreateTemp(filepath.Dir(target), ".frozen-*.tmp") |
| 616 | if err != nil { |
| 617 | return err |
| 618 | } |
| 619 | tmpPath := tmp.Name() |
| 620 | defer os.Remove(tmpPath) |
| 621 | if _, err := copyStreamWithContext(ctx, tmp, in); err != nil { |
| 622 | _ = tmp.Close() |
| 623 | return err |
| 624 | } |
| 625 | if err := tmp.Sync(); err != nil { |
| 626 | _ = tmp.Close() |
| 627 | return err |
| 628 | } |
| 629 | if err := tmp.Chmod(mode); err != nil { |
| 630 | _ = tmp.Close() |
| 631 | return err |
| 632 | } |
| 633 | if err := tmp.Close(); err != nil { |
| 634 | return err |
| 635 | } |
| 636 | return fileutil.ReplaceFile(tmpPath, target) |
| 637 | } |
| 638 | |
| 639 | func copyStreamWithContext(ctx context.Context, dst io.Writer, src io.Reader) (int64, error) { |
| 640 | buffer := make([]byte, 1<<20) |
| 641 | var total int64 |
| 642 | for { |
| 643 | if err := ctx.Err(); err != nil { |
| 644 | return total, err |
| 645 | } |
| 646 | n, readErr := src.Read(buffer) |
| 647 | if n > 0 { |
| 648 | written, writeErr := dst.Write(buffer[:n]) |
| 649 | total += int64(written) |
| 650 | if writeErr != nil { |
| 651 | return total, writeErr |
| 652 | } |
| 653 | if written != n { |
| 654 | return total, io.ErrShortWrite |
| 655 | } |
| 656 | } |
| 657 | if readErr != nil { |
| 658 | if errors.Is(readErr, io.EOF) { |
| 659 | return total, nil |
| 660 | } |
| 661 | return total, readErr |
| 662 | } |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | func sanitizedLegacyGoal(sourcePath string) map[string]any { |
| 667 | b, err := os.ReadFile(store.SessionGoalState(sourcePath)) |
| 668 | if err != nil { |
| 669 | return nil |
| 670 | } |
| 671 | var goal map[string]any |
| 672 | if json.Unmarshal(b, &goal) != nil { |
| 673 | return nil |
| 674 | } |
| 675 | delete(goal, "todos") |
| 676 | delete(goal, "todo") |
| 677 | delete(goal, "auto_continue") |
| 678 | delete(goal, "autoContinue") |
| 679 | return goal |
| 680 | } |
| 681 | |
| 682 | func migrationTargetID(path, digest, legacyHeadID string) string { |
| 683 | sum := sha256.Sum256([]byte(path + "\x00" + digest + "\x00" + legacyHeadID + "\x00" + Codec)) |
| 684 | return hex.EncodeToString(sum[:12]) |
| 685 | } |
| 686 | |
| 687 | func readManifest(path string) (Manifest, error) { |
| 688 | b, err := os.ReadFile(path) |
| 689 | if err != nil { |
| 690 | return Manifest{}, err |
| 691 | } |
| 692 | var m Manifest |
| 693 | if err := json.Unmarshal(b, &m); err != nil { |
| 694 | return Manifest{}, err |
| 695 | } |
| 696 | if !currentStoredManifest(m) { |
| 697 | return Manifest{}, fmt.Errorf("%w: manifest schema or codec", ErrUnsupportedVersion) |
| 698 | } |
| 699 | return m, nil |
| 700 | } |
| 701 | |
| 702 | func writeManifest(path string, m Manifest) error { |
| 703 | if m.Codec == "" { |
| 704 | m.Codec = Codec |
| 705 | } |
| 706 | if m.Codec == Codec && m.SchemaVersion == SchemaVersion && m.StorageRevision == 0 { |
| 707 | m.StorageRevision = StorageRevision |
| 708 | } |
| 709 | b, err := json.MarshalIndent(m, "", " ") |
| 710 | if err != nil { |
| 711 | return err |
| 712 | } |
| 713 | return fileutil.AtomicWriteFileStrict(path, append(b, '\n'), 0o600) |
| 714 | } |
| 715 | |
| 716 | func appendMigrationMapping(ctx context.Context, root string, entry MigrationEntry) error { |
| 717 | path := filepath.Join(root, "migration-map.json") |
| 718 | release, err := acquireMigrationMapLease(ctx, path) |
| 719 | if err != nil { |
| 720 | return fmt.Errorf("lock migration map: %w", err) |
| 721 | } |
| 722 | defer release() |
| 723 | mapping := MigrationMapping{SchemaVersion: SchemaVersion, Entries: []MigrationEntry{}} |
| 724 | if b, err := os.ReadFile(path); err == nil { |
| 725 | if err := json.Unmarshal(b, &mapping); err != nil { |
| 726 | return err |
| 727 | } |
| 728 | if mapping.SchemaVersion != SchemaVersion { |
| 729 | return fmt.Errorf("%w: migration map schema %d", ErrUnsupportedVersion, mapping.SchemaVersion) |
| 730 | } |
| 731 | } else if !os.IsNotExist(err) { |
| 732 | return err |
| 733 | } |
| 734 | for _, existing := range mapping.Entries { |
| 735 | if existing.SourcePath == entry.SourcePath && existing.SourceSHA256 == entry.SourceSHA256 && existing.LegacyHeadID == entry.LegacyHeadID && existing.TargetCodec == entry.TargetCodec { |
| 736 | return nil |
| 737 | } |
| 738 | } |
| 739 | mapping.Entries = append(mapping.Entries, entry) |
| 740 | sort.Slice(mapping.Entries, func(i, j int) bool { |
| 741 | if mapping.Entries[i].SourcePath == mapping.Entries[j].SourcePath { |
| 742 | if mapping.Entries[i].SourceSHA256 == mapping.Entries[j].SourceSHA256 { |
| 743 | if mapping.Entries[i].LegacyHeadID == mapping.Entries[j].LegacyHeadID { |
| 744 | return mapping.Entries[i].TargetCodec < mapping.Entries[j].TargetCodec |
| 745 | } |
| 746 | return mapping.Entries[i].LegacyHeadID < mapping.Entries[j].LegacyHeadID |
| 747 | } |
| 748 | return mapping.Entries[i].SourceSHA256 < mapping.Entries[j].SourceSHA256 |
| 749 | } |
| 750 | return mapping.Entries[i].SourcePath < mapping.Entries[j].SourcePath |
| 751 | }) |
| 752 | b, err := json.MarshalIndent(mapping, "", " ") |
| 753 | if err != nil { |
| 754 | return err |
| 755 | } |
| 756 | return fileutil.AtomicWriteFileStrict(path, append(b, '\n'), 0o600) |
| 757 | } |
| 758 | |
| 759 | func acquireMigrationMapLease(ctx context.Context, path string) (func(), error) { |
| 760 | return filelock.Acquire(ctx, path+".lock") |
| 761 | } |
| 762 | |
| 763 | func IsUnsupported(err error) bool { return errors.Is(err, ErrUnsupportedVersion) } |
| 764 |