* fix: update banner conflict recovery + server self-restart after update (#813#814)
* fix(update): restart must wait for in-flight update + reset force button on retry
Two defects in the update banner flow found during review of PR #816:
1. Two-target race (webui + agent sequential)
The client posts targets sequentially: webui succeeds and schedules
a restart timer (2 s delay); client then posts agent; server begins
agent fetch+pull; at T=2 s the restart timer fires os.execv mid-pull,
killing the agent update and closing the client connection. User
sees "Update failed (agent): Failed to fetch" even though webui did
update, and the agent repo is in an unknown partial state.
Fix: _schedule_restart() now blocks on _apply_lock before calling
os.execv. If a second update is in flight when the timer fires, the
restart thread waits until it completes. If nothing is in flight the
lock acquire is instant, so no-op updates still restart immediately.
2. Stale force-update button across retries
_showUpdateError sets btnForceUpdate to display:inline-block when
res.conflict / res.diverged. Nothing resets it on the next retry,
so a subsequent non-conflict error (e.g. network) leaves the stale
force button visible pointing at the previous target.
Fix: applyUpdates() now hides the force button and clears its
data-target at the start of each attempt.
Tests:
- test_schedule_restart_waits_for_apply_lock: holds _apply_lock from a
helper thread, verifies execv is delayed until the lock is released.
- test_schedule_restart_still_fires_when_no_update_in_flight: sanity
check that the common path still works with no contention.
- test_apply_updates_resets_force_button_at_start: regression guard
that the reset appears before the update loop begins.
Full suite: 1683 passed, 0 failures.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* fix(update): hold _apply_lock through execv + fix banner error layout
Two fixes from Opus review:
1. TOCTOU gap in _schedule_restart (api/updates.py): the original pattern
acquired _apply_lock, released it, then called os.execv — leaving a brief
window where a new update could start between release and execv. Fixed by
moving os.execv inside the 'with _apply_lock:' block so the process is
replaced while still holding the lock; no new update can acquire it.
2. Banner CSS layout (static/index.html): #updateError was a direct flex child
of .update-banner (display:flex row), so long error messages sat inline
between #updateMsg and the buttons instead of below the message.
Wrapped #updateMsg + #updateError in a flex-column container so errors
stack vertically under the status line.
* docs: add v0.50.134 CHANGELOG entry
---------
Co-authored-by: nesquena-hermes <nesquena-hermes@users.noreply.github.com>
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
