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fix: service control buttons and AP-mode SSH lockout post-install

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Two user-reported issues after fresh install:

1. All service buttons (Start/Stop/Restart Display, Restart Web Service)
   failed silently — only Reboot worked.

   Root cause: sudoers rules use `ledmatrix.service` (with suffix) but
   api_v3.py called `sudo systemctl start ledmatrix` (no suffix). sudo
   does exact string matching, so every service action was rejected with
   returncode=1. Also missing from sudoers: ledmatrix-web, journalctl,
   and is-active entries.

   Fix:
   - Add `.service` suffix to all 8 sudo systemctl call sites in
     api_v3.py (_ensure_display_service_running, _stop_display_service,
     and all execute_system_action branches).
   - Add timeout=15 to all subprocess.run calls in execute_system_action
     (previously could hang indefinitely).
   - Add missing sudoers rules to first_time_install.sh and
     configure_web_sudo.sh: ledmatrix-web.service start/stop/restart,
     is-active for both name forms, and journalctl -u/-t ledmatrix rules.

2. SSH and web UI became inaccessible after ~1 hour even though the
   display kept running.

   Root cause: wifi_monitor_daemon restarts NetworkManager after 5
   consecutive internet failures (~2.5 min). Each NM restart drops WiFi
   briefly. During that window check_and_manage_ap_mode() increments
   _disconnected_checks but the daemon never reset it after the restart.
   After 3 such NM-restart cycles, _disconnected_checks reached 3 and
   AP mode activated — changing the Pi from WiFi client to hotspot
   (192.168.4.1) and killing SSH on the old IP.

   Fix:
   - Reset wifi_manager._disconnected_checks = 0 in the daemon
     immediately after a successful NM restart so the brief drop it
     causes doesn't count toward AP-mode activation.
   - Increase _disconnected_checks_required from 3 to 6 (90s → 3min)
     as an additional buffer against transient network flaps.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-05-12 11:47:56 -04:00
parent b7295129b5
commit 9a74db6de3
5 changed files with 39 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
first_time_install.sh
View File

@@ -1086,6 +1086,7 @@ SYSTEMCTL_PATH=$(which systemctl)
REBOOT_PATH=$(which reboot)
POWEROFF_PATH=$(which poweroff)
BASH_PATH=$(which bash)
JOURNALCTL_PATH=$(which journalctl 2>/dev/null || true)
# Create sudoers content
cat > /tmp/ledmatrix_web_sudoers << EOF
@@ -1101,10 +1102,22 @@ $ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH restart ledmatrix.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH enable ledmatrix.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH disable ledmatrix.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH status ledmatrix.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH is-active ledmatrix
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH is-active ledmatrix.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH start ledmatrix-web.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH stop ledmatrix-web.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH restart ledmatrix-web.service
$ACTUAL_USER ALL=(ALL) NOPASSWD: $PYTHON_PATH $PROJECT_ROOT_DIR/display_controller.py
$ACTUAL_USER ALL=(ALL) NOPASSWD: $BASH_PATH $PROJECT_ROOT_DIR/start_display.sh
$ACTUAL_USER ALL=(ALL) NOPASSWD: $BASH_PATH $PROJECT_ROOT_DIR/stop_display.sh
EOF
if [ -n "$JOURNALCTL_PATH" ]; then
cat >> /tmp/ledmatrix_web_sudoers << EOF
$ACTUAL_USER ALL=(ALL) NOPASSWD: $JOURNALCTL_PATH -u ledmatrix.service *
$ACTUAL_USER ALL=(ALL) NOPASSWD: $JOURNALCTL_PATH -u ledmatrix *
$ACTUAL_USER ALL=(ALL) NOPASSWD: $JOURNALCTL_PATH -t ledmatrix *
EOF
fi
if [ -f "$SUDOERS_FILE" ] && cmp -s /tmp/ledmatrix_web_sudoers "$SUDOERS_FILE"; then
echo "Sudoers configuration already up to date"

6
scripts/install/configure_web_sudo.sh
View File

@@ -89,9 +89,9 @@ TEMP_SUDOERS="/tmp/ledmatrix_web_sudoers_$$"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH status ledmatrix.service"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH is-active ledmatrix"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH is-active ledmatrix.service"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH start ledmatrix-web"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH stop ledmatrix-web"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH restart ledmatrix-web"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH start ledmatrix-web.service"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH stop ledmatrix-web.service"
echo "$WEB_USER ALL=(ALL) NOPASSWD: $SYSTEMCTL_PATH restart ledmatrix-web.service"
# Optional: journalctl (non-critical — skip if not found)
if [ -n "$JOURNALCTL_PATH" ]; then

4
scripts/utils/wifi_monitor_daemon.py
View File

@@ -146,6 +146,10 @@ class WiFiMonitorDaemon:
capture_output=True, timeout=20, check=True
)
self._consecutive_internet_failures = 0
# NM restart causes a brief WiFi drop; reset the AP-mode grace
# counter so that transient disconnect doesn't count toward
# triggering AP mode.
self.wifi_manager._disconnected_checks = 0
except subprocess.CalledProcessError as e:
logger.error(f"NetworkManager restart failed (rc={e.returncode}); "
"keeping failure counter unchanged")

2
src/wifi_manager.py
View File

@@ -140,7 +140,7 @@ class WiFiManager:
# Initialize disconnected check counter for grace period
# This prevents AP mode from enabling on transient network hiccups
self._disconnected_checks = 0
self._disconnected_checks_required = 3 # Require 3 consecutive disconnected checks (90 seconds at 30s interval)
self._disconnected_checks_required = 6 # Require 6 consecutive disconnected checks (3 minutes at 30s interval)
# Timestamp set when AP mode is enabled; used for the idle-timeout check
self._ap_enabled_at: Optional[float] = None

37
web_interface/blueprints/api_v3.py
View File

@@ -218,7 +218,7 @@ def _ensure_display_service_running():
if status.get('active'):
status['started'] = False
return status
result = _run_systemctl_command(['sudo', 'systemctl', 'start', 'ledmatrix'])
result = _run_systemctl_command(['sudo', 'systemctl', 'start', 'ledmatrix.service'])
service_status = _get_display_service_status()
result['started'] = result.get('returncode') == 0
result['active'] = service_status.get('active')
@@ -227,7 +227,7 @@ def _ensure_display_service_running():
def _stop_display_service():
"""Stop the ledmatrix display service."""
result = _run_systemctl_command(['sudo', 'systemctl', 'stop', 'ledmatrix'])
result = _run_systemctl_command(['sudo', 'systemctl', 'stop', 'ledmatrix.service'])
status = _get_display_service_status()
result['active'] = status.get('active')
result['status'] = status
@@ -1716,8 +1716,8 @@ def execute_system_action():
if mode:
# For on-demand modes, we would need to integrate with the display controller
# For now, just start the display service
result = subprocess.run(['sudo', 'systemctl', 'start', 'ledmatrix'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'start', 'ledmatrix.service'],
capture_output=True, text=True, timeout=15)
return jsonify({
'status': 'success' if result.returncode == 0 else 'error',
'message': f'Started display in {mode} mode',
@@ -1726,23 +1726,23 @@ def execute_system_action():
'stderr': result.stderr
})
else:
result = subprocess.run(['sudo', 'systemctl', 'start', 'ledmatrix'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'start', 'ledmatrix.service'],
capture_output=True, text=True, timeout=15)
elif action == 'stop_display':
result = subprocess.run(['sudo', 'systemctl', 'stop', 'ledmatrix'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'stop', 'ledmatrix.service'],
capture_output=True, text=True, timeout=15)
elif action == 'enable_autostart':
result = subprocess.run(['sudo', 'systemctl', 'enable', 'ledmatrix'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'enable', 'ledmatrix.service'],
capture_output=True, text=True, timeout=15)
elif action == 'disable_autostart':
result = subprocess.run(['sudo', 'systemctl', 'disable', 'ledmatrix'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'disable', 'ledmatrix.service'],
capture_output=True, text=True, timeout=15)
elif action == 'reboot_system':
result = subprocess.run(['sudo', 'reboot'],
capture_output=True, text=True)
capture_output=True, text=True, timeout=10)
elif action == 'shutdown_system':
result = subprocess.run(['sudo', 'poweroff'],
capture_output=True, text=True)
capture_output=True, text=True, timeout=10)
elif action == 'git_pull':
# Use PROJECT_ROOT instead of hardcoded path
project_dir = str(PROJECT_ROOT)
@@ -1823,12 +1823,11 @@ def execute_system_action():
'stderr': result.stderr
})
elif action == 'restart_display_service':
result = subprocess.run(['sudo', 'systemctl', 'restart', 'ledmatrix'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'restart', 'ledmatrix.service'],
capture_output=True, text=True, timeout=15)
elif action == 'restart_web_service':
# Try to restart the web service (assuming it's ledmatrix-web.service)
result = subprocess.run(['sudo', 'systemctl', 'restart', 'ledmatrix-web'],
capture_output=True, text=True)
result = subprocess.run(['sudo', 'systemctl', 'restart', 'ledmatrix-web.service'],
capture_output=True, text=True, timeout=15)
else:
return jsonify({'status': 'error', 'message': f'Unknown action: {action}'}), 400