Charlie Marsh 7aa6519909 Use native POSIX spawning for command hooks (#47610) ...

## Why

Unix command hooks use a `pre_exec` callback to detach from the controlling terminal, forcing the launcher to fork. Native spawn attributes can create the detached session without that callback.

## What changed

- Route Unix hooks through `codex_utils_pty::Command` with `ProcessMode::NewSession`.
- Extend the native `posix_spawn` launcher to detached Linux sessions, retaining compatibility fallbacks for unsupported libc features and executable handling.
- Preserve the session environment snapshot, hook overrides, and restricted-variable filtering.

## Testing

Add regression coverage for launches without parent forks, terminal detachment, environment and argument handling, Linux `PATH` lookup, and executable compatibility. Cover process-group cleanup on cancellation and timeout, including descendants holding output pipes open, and preservation of background descendants after completed hooks.

GitOrigin-RevId: dbe2cf12d84aa79868cfb55ace40c7d5b5282703

2026-09-23 18:24:05 +00:00

..

schema/generated

Distinguish forked sessions in session-start hooks (#44349)

2026-09-10 00:26:30 +00:00

src

Use native POSIX spawning for command hooks (#47610)

2026-09-23 18:24:05 +00:00

BUILD.bazel

build: run buildifier from just fmt (#28125)

2026-06-13 21:43:39 -07:00

Cargo.toml

Use native POSIX spawning for command hooks (#47610)

2026-09-23 18:24:05 +00:00