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feat(pty): native terminal support for interactive shells#137

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NathanFlurry merged 1 commit into
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shell-pty-native
Jun 27, 2026
Merged

feat(pty): native terminal support for interactive shells#137
NathanFlurry merged 1 commit into
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shell-pty-native

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  • Add kernel PTY + sidecar terminal protocol so guest shells run like docker run -it
  • WASI crossterm support: real DSR-based cursor::position() (was a (0,0) stub) so the reedline prompt anchors correctly and Enter no longer clears the screen
  • Widen CursorPositionFilter to target_os = "wasi"
  • Add a C pty_probe fixture for deterministic PTY protocol testing
  • Misc runtime fidelity updates (v8-bridge, node import cache, wasm runner) supporting the terminal path

@railway-app railway-app Bot temporarily deployed to secure-exec / secure-exec-pr-137 June 27, 2026 20:57 Destroyed
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🚅 Deployed to the secure-exec-pr-137 environment in rivet-frontend

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secure-exec 😴 Sleeping (View Logs) Jun 27, 2026 at 9:19 pm

🚅 Deployed to the secure-exec-pr-137 environment in secure-exec

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secure-exec 😴 Sleeping (View Logs) Web Jun 27, 2026 at 9:17 pm

Adds real PTY/terminal plumbing so guest shells (brush) run like docker run -it:
kernel PTY, sidecar terminal protocol, and WASI crossterm support. Includes the
crossterm cursor-position fix (real DSR query instead of a (0,0) stub) so the
reedline prompt anchors correctly and Enter no longer clears the screen, plus a
C pty_probe fixture for protocol testing.
@railway-app railway-app Bot temporarily deployed to secure-exec / secure-exec-pr-137 June 27, 2026 21:12 Destroyed
@railway-app railway-app Bot temporarily deployed to rivet-frontend / secure-exec-pr-137 June 27, 2026 21:12 Destroyed
@NathanFlurry NathanFlurry merged commit 27b48c5 into main Jun 27, 2026
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NathanFlurry pushed a commit that referenced this pull request Jun 28, 2026
#137 added the 'reedline' feature to cmd-sh for native PTY support, but reedline
pulls brush-interactive's tokio block_in_place/Handle::block_on paths, which don't
compile or run on single-threaded wasm — breaking the wasm command build (masked
until the fd-lock patch fix let the build reach brush). Enable reedline only on
native targets; wasm keeps 'minimal' (the pre-#137 wasm-building config).
NathanFlurry added a commit that referenced this pull request Jun 28, 2026
…g local deps (#139)

* fix(ci): stop boundary lint false-positive on fixtures; guard escaping local deps

- check-secure-exec-boundary now skips boundary-check *.test.mjs files, which
  legitimately embed forbidden import specifiers as string fixtures (this was
  failing main since the registry-test-runtime-boundary test landed).
- add check-no-escaping-local-deps: rejects link:/file:/path: deps whose target
  resolves outside the repo root (catches stray local-dev overrides) while
  allowing in-repo links and workspace crate paths.
- wire both into scripts/ci.sh; add regression tests for each.

* style(sidecar): rustfmt execution.rs

Pre-existing rustfmt drift on main, previously masked by the boundary-lint
failure that aborted ci.sh before cargo fmt ran.

* test(sidecar): allowlist host-side diagnostic env/fs reads in architecture guards

Pre-existing main failure unmasked once the fmt drift was fixed: the chokepoint
lint flagged new host-side V8 diagnostics (AGENTOS_MODULE_TRACE, AGENTOS_SYNCRPC_LAT,
PI_SNAPSHOT_BUNDLE_PATH) and the SECURE_EXEC_LOG startup knob. These are host-only,
not guest-reachable, so allowlist them with justification per the lint's guidance.

* test(execution): make python VFS RPC match exhaustive after delete/rename

#138 added Unlink/Rmdir/Rename to PythonVfsRpcMethod but left the rpc-bridge
test's match non-exhaustive (E0004), breaking clippy --all-targets. This test's
scenario doesn't mutate the FS, so treat those variants as unexpected.

* fix(native): regenerate fd-lock WASI patch against vendored 4.0.4

The committed patch was authored against an AsFd-based fd-lock; vendored 4.0.4
uses std::os::unix::io::AsRawFd, so the patch no longer applied and broke the
WASM-command vendoring in the publish pipeline. Regenerated against the current
source (generic AsOpenFile trait + real unsupported-target RwLock impls).

* test(sidecar): allow too_many_arguments on python CLI test helpers

clippy --all-targets -D warnings flagged two 8+/7-arg test helpers.

* test(execution): service VFS RPCs in python prewarm test

#138's runner sets up a kernel-VFS-backed site-packages on boot, emitting VFS
RPCs that the prewarm test's .wait() path could not service (PendingVfsRpcRequest).
Drive the event loop and reject VFS RPCs so the runner's best-effort setup
degrades; the execution still completes. Verified locally.

* test(sidecar): align limits frame-cap constant with production default

The test hardcoded a 1 MiB SIDECAR_FRAME_CAP, but production validates limits with
wire::DEFAULT_MAX_FRAME_BYTES (16 MiB; lib.rs/state.rs). The default fetch body cap
tracks that 16 MiB, so the stale 1 MiB test cap made even the default config fail
validation. Align the test constant to 16 MiB.

* test(sidecar): align python VFS RPC path test with kernel-confinement model

normalize_python_vfs_rpc_path roots at / and resolves textual ../. segments,
deferring confinement to the kernel/mount layer (openat2 RESOLVE_BENEATH) per the
trust model. The test still asserted the old workspace-prefix rejection; update it
to expect textual resolution and rename accordingly. Only relative paths are rejected.

* fix(native): build sh/brush without reedline on wasm

#137 added the 'reedline' feature to cmd-sh for native PTY support, but reedline
pulls brush-interactive's tokio block_in_place/Handle::block_on paths, which don't
compile or run on single-threaded wasm — breaking the wasm command build (masked
until the fd-lock patch fix let the build reach brush). Enable reedline only on
native targets; wasm keeps 'minimal' (the pre-#137 wasm-building config).

---------

Co-authored-by: NathanFlurry <anthropic2@nathanflurry.com>
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