paperclip/packages/adapter-utils/src/sandbox-shell.ts

export function preferredShellForSandbox(shellCommand: string | null | undefined): "bash" | "sh" {
  return shellCommand === "bash" ? "bash" : "sh";
}
Let sandbox providers declare shell defaults (#5114) ## Thinking Path > - Paperclip orchestrates AI agents for zero-human companies > - Agents execute in sandboxed remote environments served by pluggable sandbox > providers (E2B today, more later) > - Today every sandbox command runs under `sh -lc` regardless of what the > provider's container actually ships > - That misses bash-only shell init on E2B (which ships bash) and prevents > future providers from declaring a different default — there's no way for a > provider to say "I have bash, use it" > - This PR adds a `shellCommand` field to sandbox execution targets so providers > can declare their preferred shell ("bash" for E2B), threads it through the > sandbox-managed-runtime client, callback bridge, and execution-target shell > helper, and validates the value at the lease-metadata boundary > - The benefit is that sandbox commands run under the right shell on the right > provider, and adding new sandbox providers only needs to declare a shell > preference ## What Changed - Added `packages/adapter-utils/src/sandbox-shell.ts` exporting `preferredShellForSandbox(shellCommand)` (returns `"bash"` if input is `"bash"`, else `"sh"`) - Added `shellCommand?: "bash" \| "sh" \| null` to `AdapterSandboxExecutionTarget` and `CommandManagedRuntimeSpec`; threaded it through `runAdapterExecutionTargetShellCommand`, `prepareAdapterExecutionTargetRuntime`, and `startAdapterExecutionTargetPaperclipBridge` - `createCommandManagedRuntimeClient`, `prepareCommandManagedRuntime`, and `createCommandManagedSandboxCallbackBridgeQueueClient` now take an optional `shellCommand` and use `preferredShellForSandbox` to pick the shell - `startSandboxCallbackBridgeServer` accepts a `shellCommand` for its server startup, readiness probe, and stop hook - E2B sandbox plugin declares `shellCommand: "bash"` in `leaseMetadata` - `resolveEnvironmentExecutionTarget` reads `shellCommand` from lease metadata (validating against `"bash" \| "sh" \| null`) - `environment-runtime.ts` adds `"shellCommand"` to `INTERNAL_PLUGIN_SANDBOX_CONFIG_KEYS` so the field round-trips through internal plugin config without leaking to external plugin metadata - Updated tests in `command-managed-runtime.test.ts`, `execution-target-sandbox.test.ts`, `sandbox-callback-bridge.test.ts`, `environment-execution-target.test.ts` ## Verification - `pnpm --filter @paperclipai/adapter-utils test` - `pnpm --filter @paperclipai/server test -- environment-execution-target` - `pnpm --filter @paperclipai/sandbox-providers-e2b test` - Manual QA: boot a Paperclip instance, create an E2B-backed environment, run a claude_local agent against it, and confirm the run completes (verifies bash shell semantics flow through the callback bridge end-to-end) ## Risks - E2B sandbox commands now run under `bash -lc` instead of `sh -lc`. Bash is a strict superset for the commands we issue (no busybox-only flags in our shell scripts), so risk is low. The shellCommand field is opt-in via lease metadata — providers that don't declare it stay on `sh`. - New optional field on `CommandManagedRuntimeSpec` and `AdapterSandboxExecutionTarget`. Consumers ignoring the field retain previous behaviour (sh). - Lease metadata now carries an additional field. Existing leases without `shellCommand` resolve to `null` and fall back to sh — backwards compatible. ## Model Used - OpenAI GPT-5.4 (reasoning effort: high) via Codex CLI - Provider: OpenAI - Used to author the code changes in this PR ## 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 - [ ] If this change affects the UI, I have included before/after screenshots — N/A (no UI changes) - [ ] I have updated relevant documentation to reflect my changes — N/A - [x] I have considered and documented any risks above - [x] I will address all Greptile and reviewer comments before requesting merge 2026-05-03 12:19:35 -07:00			`export function preferredShellForSandbox(shellCommand: string \| null \| undefined): "bash" \| "sh" {`
			`return shellCommand === "bash" ? "bash" : "sh";`
			`}`