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Background tasks on non-local backends (SSH/Docker/Modal/Daytona/Singularity)
go through `ProcessRegistry.spawn_via_env`, which builds a hand-crafted,
shell-safe wrapper:
mkdir -p T && ( nohup bash -lc CMD > LOG 2>&1; rc=$?; ... ) & echo $! > PID && cat PID
`BaseEnvironment.execute()` unconditionally ran `_rewrite_compound_background`
on every command, including this wrapper. The rewrite (meant to defuse the
`A && B &` subshell-wait trap for user commands) turns `( ... ) & echo $!` into
`{ ( ... ) & } echo $!` — note `} echo` with no separator, which is a bash
syntax error. The wrapper then never produces a PID, the redirected output file
is never created, and the agent sees an immediate exit code -1. This breaks
*every* background launch on a non-local backend (e.g. a simple
count-and-redirect script over SSH), not just edge cases.
Fix:
- Add `rewrite_compound_background: bool = True` to `BaseEnvironment.execute()`
(and the `BaseModalExecutionEnvironment` override, which accepts and ignores
it). Default preserves existing behavior; the user foreground terminal path
still rewrites.
- `spawn_via_env` passes `rewrite_compound_background=False` so its already
shell-safe wrapper is left intact.
- Treat a wrapper that produces no PID as a failed launch (mark the session
exited with a real exit code instead of exposing a fake running session), and
don't register/checkpoint a session that never started.
Verified empirically: with the rewrite skipped, the wrapper is valid bash,
launches the process, captures the PID, and writes the log/pid/exit files; the
old rewritten form fails `bash -n` with a syntax error.
Based on #33756 by @CharZhou (extracted from a multi-feature branch; the
unrelated image_gen / docker-media changes are not included here).
Co-authored-by: CharZhou <17255546+CharZhou@users.noreply.github.com>
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|---|---|---|
| .. | ||
| lib | ||
| tests | ||
| whatsapp-bridge | ||
| analyze_livetest.py | ||
| benchmark_browser_eval.py | ||
| build_model_catalog.py | ||
| build_skills_index.py | ||
| check-windows-footguns.py | ||
| contributor_audit.py | ||
| discord-voice-doctor.py | ||
| hermes-gateway | ||
| install.cmd | ||
| install.ps1 | ||
| install.sh | ||
| install_psutil_android.py | ||
| keystroke_diagnostic.py | ||
| kill_modal.sh | ||
| lint_diff.py | ||
| LIVETEST_README.md | ||
| profile-tui.py | ||
| release.py | ||
| run_tests.sh | ||
| run_tests_parallel.py | ||
| sample_and_compress.py | ||
| setup_open_webui.sh | ||
| tool_search_livetest.py | ||