Two log-spam fixes surfaced by a Windows user (Git Bash + Python 3.11.9):
1. LocalEnvironment cwd warn spam
============================
Git Bash's `pwd -P` emits paths like `/c/Users/x`. The base-class
`_extract_cwd_from_output` was assigning this verbatim to `self.cwd`
without validation, then `_resolve_safe_cwd`'s `os.path.isdir(/c/...)`
returned False on Windows, triggering:
LocalEnvironment cwd '/c/Users/NVIDIA' is missing on disk;
falling back to '/' so terminal commands keep working.
...on every terminal call. The pre-existing Windows-path translation
inside `_run_bash` ran AFTER the safe-cwd check, so it could never
prevent the warning.
Fix:
- New `_msys_to_windows_path` helper (idempotent, no-op off Windows).
- `_resolve_safe_cwd` normalizes before `isdir`, so a valid MSYS path
is recognized as the real directory it points at.
- `LocalEnvironment._update_cwd` and a new override of
`_extract_cwd_from_output` translate + validate before mutating
`self.cwd`. Stale / non-existent marker paths roll back to the
previous cwd instead of clobbering it.
- The fallback warning still fires when the directory really is gone
(deletion-recovery scenario from #17558 still covered).
2. tirith spawn-failed warn spam
=============================
When tirith isn't installed (background install in flight, or marked
failed for the day) and the configured path stays as the bare string
`tirith`, every `subprocess.run([tirith_path, ...])` raises OSError
and logged:
tirith spawn failed: [WinError 2] The system cannot find the file specified
...on every command. fail_open=True means behaviour is correct, but
the log noise is severe.
Fix:
- `_warn_once(key, ...)` thread-safe dedupe helper.
- Three hot-path warnings (`tirith path resolved to None`,
`tirith spawn failed: ...`, `tirith timed out after Ns`) now log
once per (exception class, errno) / timeout-value / path-none key.
- Dedupe set is cleared on `_clear_install_failed` so a successful
install lets a subsequent failure surface again.
Tests
=====
- `tests/tools/test_local_env_windows_msys.py`: 12 tests covering the
MSYS→Windows translator, the resolve fast-path, update_cwd validation,
and extract_cwd_from_output rollback.
- `tests/tools/test_tirith_security.py`: 4 new dedupe tests (15 spawn
failures → 1 log line; distinct exc types → 2 lines; timeout dedupe;
path-None dedupe).
Targeted runs:
test_local_env_windows_msys.py 12 passed
test_local_env_cwd_recovery.py 7 passed (pre-existing, no regressions)
test_tirith_security.py 67 passed (63 pre-existing + 4 new)
test_base_environment + local_* 37 passed (no regressions)
test_local_env_blocklist + neighbours 114 passed
Reported via Hermes log capture: 19× cwd warnings + 15× tirith warnings
in a single short session.
4aec25bc44