fix(dashboard): skip unreadable plugin manifests

hermes_cli/web_server_dashboard.py

@@ -540,21 +540,28 @@ def _discover_dashboard_plugins() -> list:
     plugins = []
     seen_names: set = set()
     for plugins_root, source in _dashboard_plugin_search_dirs():
-        if not plugins_root.is_dir():
+        try:
+            if not plugins_root.is_dir():
+                continue
+            with os.scandir(plugins_root) as scan:
+                children = sorted((Path(e.path) for e in scan), key=lambda p: p.name)
+        except OSError as exc:
+            _log.warning("Skipping unreadable dashboard plugin root %s: %s", plugins_root, exc)
             continue
-        with os.scandir(plugins_root) as scan:
-            children = sorted((Path(e.path) for e in scan), key=lambda p: p.name)
         for child in children:
             manifest_file = child / "dashboard" / "manifest.json"
-            if not child.is_dir() or not manifest_file.exists():
-                continue
             try:
+                if not child.is_dir() or not manifest_file.exists():
+                    continue
                 data = json.loads(manifest_file.read_text(encoding="utf-8"))
                 name = data.get("name", child.name)
                 if name in seen_names:
                     continue
                 seen_names.add(name)
                 plugins.append(_dashboard_plugin_entry(data, name, child / "dashboard", source))
+            except OSError as exc:
+                _log.warning("Skipping unreadable dashboard plugin %s: %s", manifest_file, exc)
+                continue
             except Exception as exc:
                 _log.warning("Bad dashboard plugin manifest %s: %s", manifest_file, exc)
                 continue

tests/hermes_cli/test_web_server.py

@@ -4540,6 +4540,51 @@ class TestDashboardPluginManifestExtensions:
         assert len(entries) == 1
         assert entries[0]["tab"]["path"] == "/from-profile"
 
+    def test_unreadable_plugin_paths_do_not_block_discovery(self, tmp_path, monkeypatch, caplog):
+        """A denied plugin directory or manifest must not prevent valid plugins loading."""
+        from pathlib import Path
+
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        self._write_plugin(tmp_path, "valid", {
+            "name": "valid",
+            "label": "Valid Plugin",
+            "entry": "dist/index.js",
+        })
+        denied_root = tmp_path / "denied-root"
+        denied_root.mkdir()
+        denied_plugin = tmp_path / "plugins" / "denied"
+        (denied_plugin / "dashboard").mkdir(parents=True)
+        (denied_plugin / "dashboard" / "manifest.json").write_text("{}", encoding="utf-8")
+
+        from hermes_cli import web_server_dashboard
+        original_search_dirs = web_server_dashboard._dashboard_plugin_search_dirs
+        original_scandir = web_server_dashboard.os.scandir
+        original_exists = Path.exists
+
+        def search_dirs():
+            return [(denied_root, "user"), *original_search_dirs()]
+
+        def guarded_scandir(path):
+            if Path(path) == denied_root:
+                raise PermissionError("[WinError 5] Access is denied")
+            return original_scandir(path)
+
+        def guarded_exists(path):
+            if path == denied_plugin / "dashboard" / "manifest.json":
+                raise PermissionError("[WinError 5] Access is denied")
+            return original_exists(path)
+
+        monkeypatch.setattr(web_server_dashboard, "_dashboard_plugin_search_dirs", search_dirs)
+        monkeypatch.setattr(web_server_dashboard.os, "scandir", guarded_scandir)
+        monkeypatch.setattr(Path, "exists", guarded_exists)
+
+        plugins = web_server_dashboard._discover_dashboard_plugins()
+
+        assert "valid" in {plugin["name"] for plugin in plugins}
+        assert "denied" not in {plugin["name"] for plugin in plugins}
+        assert "Skipping unreadable dashboard plugin root" in caplog.text
+        assert "Skipping unreadable dashboard plugin" in caplog.text
+