fix(reliability): probe section existence via uci show, not an option key

payload/user/remote_access/pager-webui/mk8_guard.py

@@ -34,9 +34,10 @@ def _pool_size():
 def _ensure_pineapd_section():
     """Stock daemon rewrites and profile restores can drop the whole
     `config pineapd` section; every @pineapd[0] option write fails with
-    'Invalid argument' until it exists again."""
-    rc, out, err = device_run(['uci', '-q', 'get',
-                               'pineapd.@pineapd[0].logrecon'])
+    'Invalid argument' until it exists again. Probes SECTION existence
+    (`uci -q show @pineapd[0]`) — never an option, which may legitimately
+    be absent from a rewritten section."""
+    rc, out, err = device_run(['uci', '-q', 'show', 'pineapd.@pineapd[0]'])
     if rc == 0:
         return False
     device_run(['uci', 'add', 'pineapd', 'pineapd'])

payload/user/remote_access/pager-webui/server.py

@@ -4643,13 +4643,17 @@ PINEAPD_RUNTIME_UCI.add('pineapd.@ssidpool[0].disable')
 
 
 def _apply_uci_wanted(wanted):
-    """Idempotently apply a wanted UCI key/value set. Returns changed keys."""
+    """Idempotently apply a wanted UCI key/value set. Returns changed keys.
+    A failed `uci set` (e.g. missing anchor section) is NOT reported as
+    applied."""
     actions = []
     for key, value in wanted.items():
         rc, out, err = device_run(['uci', 'get', key])
         if rc != 0 or out.strip() != value:
-            device_run(['uci', 'set', '%s=%s' % (key, value)])
-            actions.append(key)
+            src_rc, s_out, s_err = device_run(
+                ['uci', 'set', '%s=%s' % (key, value)])
+            if src_rc == 0:
+                actions.append(key)
     return actions
 
 

tests/test_mk8_guard.py

@@ -109,8 +109,7 @@ class SectionRecreateTest(unittest.TestCase):
         def fake_run(args, timeout=20, input_data=None):
             a = list(args)
             self.calls.append(a)
-            if a[:4] == ['uci', '-q', 'get',
-                         'pineapd.@pineapd[0].logrecon']:
+            if a[:3] == ['uci', '-q', 'show']:
                 return (1, '', '')  # section missing
             if a[:2] == ['uci', 'get']:
                 got = self.uci.get(a[2])