forked from farhoodlabs/paperclip
Devin Foley
50db8c01d2
> **Stacked PR.** This PR's branch carries cumulative content from #5324 (bridge allowlist expand) and #5325 (env sanitization) — the mutex/sha256 logic in this PR sits on top of both. Reviewers should focus on the files this PR's commit touches: `packages/adapter-utils/src/sandbox-callback-bridge.{ts,test.ts}`, `packages/adapter-utils/src/ssh.ts`, and `packages/adapter-utils/src/ssh-fixture.test.ts`. Will rebase onto `master` and force-push once both prerequisite PRs are merged. ## Thinking Path > - Paperclip orchestrates AI agents for zero-human companies > - Each agent that runs in a sandbox or via SSH talks back to the Paperclip server through a per-lease callback bridge whose entrypoint script is uploaded to the remote > - When two heartbeats target the same agent on the same machine concurrently, both upload the bridge entrypoint and both write to the same response files — producing torn-write races: `SyntaxError: Identifier 'randomUUID' has already been declared` from a concatenated upload, `mv: cannot stat …` from colliding `.json.tmp` writes, and 0-byte commits from a truncated stdin > - This pull request serializes those operations with a POSIX `mkdir`-mutex (PID liveness check + atomic rename) at the bridge entrypoint upload, applies the same lock to the bridge response writer, forwards stdin into remote ssh commands so the entrypoint payload arrives intact, and verifies a sha256 of the upload before promoting it > - The benefit is concurrent heartbeats no longer corrupt each other's bridge state ## What Changed - `packages/adapter-utils/src/sandbox-callback-bridge.ts`: serialize entrypoint upload and response writes via POSIX `mkdir`-mutex with PID liveness; sha256 the upload before promoting via `mv`; content-skip when the existing entrypoint already matches - `packages/adapter-utils/src/ssh.ts`: forward stdin into remote ssh commands through the SSH managed runtime so `cat > "$remote_upload"` actually receives the base64-encoded entrypoint - `packages/adapter-utils/src/ssh-fixture.test.ts`: cover the stdin-forwarded SSH path - `packages/adapter-utils/src/sandbox-callback-bridge.test.ts`: cover the mutex, content-skip, sha256-verify, and atomic-rename paths ## Verification - `pnpm vitest run --no-coverage --project @paperclipai/adapter-utils` - `pnpm typecheck` clean - Manual: two parallel heartbeats targeting the same SSH agent no longer race on the bridge entrypoint or response files ## Risks Medium. Serializing previously-parallel operations adds latency on the contended path (one heartbeat waits on another), bounded by the entrypoint upload time. The mutex includes PID liveness so a crashed heartbeat doesn't deadlock subsequent ones. Sha256-verify gives a clear "torn upload" failure mode instead of silent 0-byte commits. ## Model Used Claude Opus 4.7 (1M context) ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable — tests cover mutex + sha256-verify + stdin-forwarded ssh - [x] If this change affects the UI, I have included before/after screenshots — N/A (no UI) - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] I will address all Greptile and reviewer comments before requesting merge