networkAgent: Drop VPN plugin cache

libnm doesn't only search for plugins in the regular VPN plugin directory,
but also in the legacy location and the directory pointed to by the
NM_VPN_PLUGIN_DIR environment variable (if set).

We don't monitor the additional directories, so it's possible for our cache
to become outdated.

Instead of trying to play catch-up with libnm's internals, do what nm-applet
does and use the appropriate API to look up the plugin on each request.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/2386

js/misc/config.js.in

@@ -15,6 +15,5 @@ var LOCALEDIR = '@datadir@/locale';
 /* other standard directories */
 var LIBEXECDIR = '@libexecdir@';
 var PKGDATADIR = '@datadir@/@PACKAGE_NAME@';
-var VPNDIR = '@vpndir@';
 /* g-i package versions */
 var LIBMUTTER_API_VERSION = '@LIBMUTTER_API_VERSION@'

js/misc/meson.build

@@ -7,7 +7,6 @@ jsconf.set10('HAVE_BLUETOOTH', bt_dep.found())
 jsconf.set10('HAVE_NETWORKMANAGER', have_networkmanager)
 jsconf.set('datadir', datadir)
 jsconf.set('libexecdir', libexecdir)
-jsconf.set('vpndir', vpndir)
 
 config_js = configure_file(
   input: 'config.js.in',

js/ui/components/networkAgent.js

@@ -622,14 +622,6 @@ var NetworkAgent = class {
         this._vpnRequests = { };
         this._notifications = { };
 
-        this._pluginDir = Gio.file_new_for_path(Config.VPNDIR);
-        try {
-            let monitor = this._pluginDir.monitor(Gio.FileMonitorFlags.NONE, null);
-            monitor.connect('changed', () => (this._vpnCacheBuilt = false));
-        } catch (e) {
-            log(`Failed to create monitor for VPN plugin dir: ${e.message}`);
-        }
-
         this._native.connect('new-request', this._newRequest.bind(this));
         this._native.connect('cancel-request', this._cancelRequest.bind(this));
 
@@ -773,9 +765,7 @@ var NetworkAgent = class {
         let vpnSetting = connection.get_setting_vpn();
         let serviceType = vpnSetting.service_type;
 
-        this._buildVPNServiceCache();
-
-        let binary = this._vpnBinaries[serviceType];
+        let binary = this._findAuthBinary(serviceType);
         if (!binary) {
             log('Invalid VPN service type (cannot find authentication binary)');
 
@@ -791,36 +781,26 @@ var NetworkAgent = class {
         this._vpnRequests[requestId] = vpnRequest;
     }
 
-    _buildVPNServiceCache() {
-        if (this._vpnCacheBuilt)
-            return;
+    _findAuthBinary(serviceType) {
+        const plugin = NM.VpnPluginInfo.new_search_file(null, serviceType);
 
-        this._vpnCacheBuilt = true;
-        this._vpnBinaries = { };
+        if (plugin === null)
+            return null;
 
-        NM.VpnPluginInfo.list_load().forEach(plugin => {
-            let service = plugin.get_service();
-            let fileName = plugin.get_auth_dialog();
-            let supportsHints = plugin.supports_hints();
-            let externalUIMode = false;
-
-            let prop = plugin.lookup_property('GNOME', 'supports-external-ui-mode');
-            if (prop) {
-                prop = prop.trim().toLowerCase();
-                externalUIMode = ['true', 'yes', 'on', '1'].includes(prop);
-            }
-
-            if (GLib.file_test(fileName, GLib.FileTest.IS_EXECUTABLE)) {
-                let binary = { fileName, externalUIMode, supportsHints };
-                this._vpnBinaries[service] = binary;
-
-                plugin.get_aliases().forEach(alias => {
-                    this._vpnBinaries[alias] = binary;
-                });
-            } else {
+        const fileName = plugin.get_auth_dialog();
+        if (!GLib.file_test(fileName, GLib.FileTest.IS_EXECUTABLE)) {
             log('VPN plugin at %s is not executable'.format(fileName));
+            return null;
         }
-        });
+
+        const prop = plugin.lookup_property('GNOME', 'supports-external-ui-mode');
+        const trimmedProp = prop ? prop.trim().toLowerCase() : '';
+
+        return {
+            fileName,
+            supportsHints: plugin.supports_hints(),
+            externalUIMode: ['true', 'yes', 'on', '1'].includes(trimmedProp),
+        };
     }
 };
 var Component = NetworkAgent;

meson.build

@@ -115,12 +115,8 @@ if get_option('networkmanager')
   nm_deps += dependency('libnm', version: nm_req)
   nm_deps += dependency('libsecret-1', version: secret_req)
 
-  vpndir = nm_deps[0].get_pkgconfig_variable('vpnservicedir')
-
   have_networkmanager = true
 else
-  vpndir = prefix
-
   have_networkmanager = false
 endif