Follow-up to @Strontvod's fix.
Tests:
- Five new tests in test_update_concurrent_quarantine.py cover the parent-
chain exclusion: the .exe launcher is excluded, an unrelated sibling
hermes.exe is still reported, multi-level ancestry is fully excluded,
PID cycles in the parent chain don't hang, and a partially-stubbed
psutil (no Process attribute) degrades gracefully instead of crashing.
- New _fake_psutil_with_parent_chain helper builds a fuller stand-in
(Process / NoSuchProcess / AccessDenied + process_iter) than the
process_iter-only SimpleNamespace the older tests use.
Hardening:
- Broaden the except in the parent-walk to bare Exception. The original
fix listed (NoSuchProcess, AccessDenied, ValueError), but those names
are evaluated lazily during exception matching — if psutil is a partial
stub without the attribute, the exception handler itself raises
AttributeError that escapes. The function is documented as 'never raises'
(the surrounding update flow depends on it), so the broader catch keeps
the contract regardless of how the dependency is shaped.
AUTHOR_MAP:
- Map schepers.zander1@gmail.com -> Strontvod so the salvaged commit
resolves to @Strontvod in the release notes.
All 18 detect_concurrent + quarantine tests pass.
* fix(update): detect concurrent hermes.exe on Windows; retry + restart-defer quarantine
Closes#26670.
When 'hermes update' runs on Windows with another hermes.exe alive (most
commonly the Hermes Desktop Electron app's spawned backend) _quarantine_running_hermes_exe()
fails to rename the venv shim with [WinError 32]. uv pip install -e .
then exits 2, the git-pull fast path is silently abandoned, and the ZIP
fallback runs (and fails the same way) before eventually succeeding.
This change implements three of the five proposed fixes from the issue:
1. Concurrent-instance detection (preferred fix). _detect_concurrent_hermes_instances()
uses psutil to enumerate processes whose .exe is one of our venv shims
(hermes.exe / hermes-gateway.exe), excluding the caller's PID. When any
match exists, cmd_update prints an actionable message naming the
blocking PIDs and exits 2 BEFORE any destructive work. New --force flag
bypasses the gate.
2. Retry + restart-deferred fallback. _quarantine_running_hermes_exe()
now retries the rename up to 4 times with 100/250/500/1000 ms backoff
(covers the transient AV-scanner-handle case). If all retries fail,
it schedules the replacement via MoveFileExW with the OS deferred-rename
flag so the new shim can land at the original path and the update
completes; the old image is fully unloaded after the user's next
system restart.
3. Actionable warning text. The old 'Could not quarantine: [WinError 32]'
warning is replaced with one that names the likely culprits (Hermes
Desktop, REPLs, gateway, AV) and points to the new --force flag.
Tests:
- 13 new tests in tests/hermes_cli/test_update_concurrent_quarantine.py
covering: psutil-based enumeration, self-pid exclusion, case-insensitive
matching of .EXE, no-psutil graceful degradation, off-Windows no-op,
helpful warning formatting, retry-then-succeed, restart-deferred fallback,
cmd_update abort + exit code 2, and --force bypass.
- New autouse fixture in tests/hermes_cli/conftest.py defaults
_detect_concurrent_hermes_instances to [] so the rest of the suite
isn't tripped by the developer's own running hermes.exe. Opt-out marker
'real_concurrent_gate' registered in pyproject.toml.
- Updating docs page (website/docs/getting-started/updating.md) gains a
short section explaining the new Windows error and remediation.
* chore: refresh uv.lock to match pyproject.toml exact pins
aiohttp 3.13.4 -> 3.13.3 (matches pyproject pin: aiohttp==3.13.3)
anthropic 0.87.0 -> 0.86.0 (matches pyproject pin: anthropic==0.86.0)
hermes-agent 0.13.0 -> 0.14.0 (matches pyproject version)
CI's uv lock --check was failing on the merged state because main
drifted: pyproject.toml uses exact == pins for those two deps and the
hermes-agent version was bumped to 0.14.0 but the lockfile still had
0.13.0.
