nexus/.planning/phases/25-file-system/25-06-SUMMARY.md

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
25-file-system	06	api	git versioning file-history execFile child_process	phase provides 25-01 chatFileService, chatFileRoutes, StorageService integration phase provides 25-00 chat_files DB schema, ChatFile shared types	gitFileService with ensureRepo, commitFile, getLog using safe execFile GET /files/:fileId/history endpoint returning git log entries Git commit on every file upload (non-blocking fire-and-forget) ChatFileHistoryEntry shared type	25-file-system any plan using file version history	added patterns node:child_process execFile node:util promisify fire-and-forget git commit after upload execFile array args for shell-injection safety	created modified server/src/services/git-file-service.ts server/src/routes/chat-files.ts packages/shared/src/types/chat.ts packages/shared/src/index.ts .planning/REQUIREMENTS.md	Used execFile (not exec) for all git commands — array-based args prevent shell injection Git commit is fire-and-forget (.catch(() => {})) so upload response is not blocked History route placed before /content route to prevent Express /files/:fileId/* ambiguity resolveDefaultStorageDir() used to find storage root — same path LocalDiskProvider uses	gitFileService: factory function returning interface with ensureRepo/commitFile/getLog ensureRepo lazily initializes git repo on first use — idempotent via .git dir check	FILE-09 FILE-10	5min	2026-04-01

Phase 25 Plan 06: Git File Versioning Summary

Git versioning layer added to file uploads: gitFileService wraps git CLI with safe execFile, every upload creates a commit, GET /files/:fileId/history exposes git log

Performance

• Duration: 5 min
• Started: 2026-04-01T21:59:30Z
• Completed: 2026-04-01T22:04:30Z
• Tasks: 2
• Files modified: 5

Accomplishments

• Created gitFileService with ensureRepo (lazy git init), commitFile (add+commit via execFile), getLog (parse git log output)
• Wired git commit into POST /conversations/:id/files upload flow as non-blocking fire-and-forget
• Added GET /files/:fileId/history endpoint returning paginated git log entries (max 100)
• Added ChatFileHistoryEntry interface to shared types and exported from shared package index

Task Commits

Each task was committed atomically:

1. Task 1: Create gitFileService and ChatFileHistoryEntry type - eb954635 (feat)
2. Task 2: Wire git commits into upload flow and add history endpoint - 6ba745b9 (feat)

Requirements metadata: 637ecc74 (chore: mark FILE-09 and FILE-10 complete)

Files Created/Modified

• server/src/services/git-file-service.ts - Git service with ensureRepo/commitFile/getLog methods
• server/src/routes/chat-files.ts - Added git import, storageDir, gitSvc, fire-and-forget commit, /history route
• packages/shared/src/types/chat.ts - Added ChatFileHistoryEntry interface
• packages/shared/src/index.ts - Exported ChatFileHistoryEntry
• .planning/REQUIREMENTS.md - Marked FILE-09 and FILE-10 as Complete

Decisions Made

• Used execFile (promisified from node:util) instead of exec — array args cannot be shell-injected even if objectKey contained special chars
• Git commit is fire-and-forget (gitSvc.commitFile(...).catch(() => {})) — upload response sent immediately, git tracking happens asynchronously
• History endpoint placed before /files/:fileId/content so Express route matching finds /history before falling through to :fileId catch-all patterns
• Used resolveDefaultStorageDir() from home-paths.ts — the exact same path construction that LocalDiskProvider uses for its root directory

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

• Worktree was on a different branch (worktree-agent-afd26110) without phase-25 prerequisite files. Resolved by checking out required files from gsd/phase-25-file-system branch before applying plan 06 changes.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Git versioning infrastructure complete for FILE-09 and FILE-10 requirements
• gitFileService ready for reuse by any future plan needing git tracking on storage files
• History endpoint available at GET /files/:fileId/history?limit=N

Self-Check: PASSED

• FOUND: server/src/services/git-file-service.ts
• FOUND: packages/shared/src/types/chat.ts with ChatFileHistoryEntry
• FOUND: packages/shared/src/index.ts exporting ChatFileHistoryEntry
• FOUND: server/src/routes/chat-files.ts with gitSvc.commitFile and /history route
• FOUND: commit eb954635 (Task 1)
• FOUND: commit 6ba745b9 (Task 2)
• FOUND: commit 637ecc74 (REQUIREMENTS.md)
• FOUND: commit f79b79c9 (docs metadata)

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Phase: 25-file-system Completed: 2026-04-01