base-manager: allow forcing the testing without udev

Even if udev support is really built and available.

This is extremely useful to test the udev-less setup without fully
recompiling the whole daemon.

  E.g.: the daemon can be run like this:
    $ sudo /usr/sbin/ModemManager --debug --test-no-udev

  And then, the kernel events may be reported using mmcli like this:
    $ sudo mmcli --report-kernel-event-auto-scan

src/mm-base-manager.c

@@ -388,10 +388,11 @@ handle_kernel_event (MMBaseManager            *self,
     mm_obj_dbg (self, "  uid:       %s", uid ? uid : "n/a");
 
 #if defined WITH_UDEV
+    if (!mm_context_get_test_no_udev ())
         kernel_device = mm_kernel_device_udev_new_from_properties (properties, error);
-#else
-    kernel_device = mm_kernel_device_generic_new (properties, error);
+    else
 #endif
+        kernel_device = mm_kernel_device_generic_new (properties, error);
 
     if (!kernel_device)
         return FALSE;
@@ -541,12 +542,13 @@ mm_base_manager_start (MMBaseManager *self,
     }
 
 #if defined WITH_UDEV
+    if (!mm_context_get_test_no_udev ()) {
         mm_obj_dbg (self, "starting %s device scan...", manual_scan ? "manual" : "automatic");
         process_scan (self, manual_scan);
         mm_obj_dbg (self, "finished device scan...");
-#else
-    mm_obj_dbg (self, "unsupported %s device scan...", manual_scan ? "manual" : "automatic");
+    } else
 #endif
+        mm_obj_dbg (self, "unsupported %s device scan...", manual_scan ? "manual" : "automatic");
 }
 
 /*****************************************************************************/
@@ -725,16 +727,17 @@ scan_devices_auth_ready (MMAuthProvider *authp,
         g_dbus_method_invocation_take_error (ctx->invocation, error);
     else {
 #if defined WITH_UDEV
+        if (!mm_context_get_test_no_udev ()) {
             /* Otherwise relaunch device scan */
             mm_base_manager_start (MM_BASE_MANAGER (ctx->self), TRUE);
             mm_gdbus_org_freedesktop_modem_manager1_complete_scan_devices (
                 MM_GDBUS_ORG_FREEDESKTOP_MODEM_MANAGER1 (ctx->self),
                 ctx->invocation);
-#else
+        } else
+#endif
             g_dbus_method_invocation_return_error_literal (
                 ctx->invocation, MM_CORE_ERROR, MM_CORE_ERROR_UNSUPPORTED,
                 "Cannot request manual scan of devices: unsupported");
-#endif
     }
 
     scan_devices_context_free (ctx);
@@ -788,7 +791,7 @@ report_kernel_event_auth_ready (MMAuthProvider           *authp,
         goto out;
 
 #if defined WITH_UDEV
-    if (ctx->self->priv->auto_scan) {
+    if (!mm_context_get_test_no_udev () && ctx->self->priv->auto_scan) {
         error = g_error_new_literal (MM_CORE_ERROR, MM_CORE_ERROR_UNSUPPORTED,
                                      "Cannot report kernel event: "
                                      "udev monitoring already in place");
@@ -1397,12 +1400,13 @@ initable_init (GInitable     *initable,
         return FALSE;
 
 #if defined WITH_UDEV
+    if (!mm_context_get_test_no_udev ()) {
         /* Create udev client based on the subsystems requested by the plugins */
         self->priv->udev = g_udev_client_new (mm_plugin_manager_get_subsystems (self->priv->plugin_manager));
-
         /* If autoscan enabled, list for udev events */
         if (self->priv->auto_scan)
             g_signal_connect_swapped (self->priv->udev, "uevent", G_CALLBACK (handle_uevent), initable);
+    }
 #endif
 
     /* Export the manager interface */

src/mm-context.c

@@ -222,6 +222,9 @@ mm_context_get_log_relative_timestamps (void)
 static gboolean  test_session;
 static gboolean  test_enable;
 static gchar    *test_plugin_dir;
+#if defined WITH_UDEV
+static gboolean  test_no_udev;
+#endif
 
 static const GOptionEntry test_entries[] = {
     {
@@ -239,6 +242,13 @@ static const GOptionEntry test_entries[] = {
         "Path to look for plugins",
         "[PATH]"
     },
+#if defined WITH_UDEV
+    {
+        "test-no-udev", 0, 0, G_OPTION_ARG_NONE, &test_no_udev,
+        "Run without udev support even if available",
+        NULL
+    },
+#endif
     { NULL }
 };
 
@@ -274,6 +284,14 @@ mm_context_get_test_plugin_dir (void)
     return test_plugin_dir ? test_plugin_dir : PLUGINDIR;
 }
 
+#if defined WITH_UDEV
+gboolean
+mm_context_get_test_no_udev (void)
+{
+    return test_no_udev;
+}
+#endif
+
 /*****************************************************************************/
 
 static void
@@ -345,5 +363,8 @@ mm_context_init (gint argc,
         g_warning ("error: --initial-kernel-events must be used only if --no-auto-scan is also used");
         exit (1);
     }
+    /* Force skipping autoscan if running test without udev */
+    if (test_no_udev)
+        no_auto_scan = TRUE;
 #endif
 }

src/mm-context.h

@@ -46,5 +46,8 @@ gboolean     mm_context_get_log_relative_timestamps (void);
 gboolean     mm_context_get_test_session    (void);
 gboolean     mm_context_get_test_enable     (void);
 const gchar *mm_context_get_test_plugin_dir (void);
+#if defined WITH_UDEV
+gboolean     mm_context_get_test_no_udev    (void);
+#endif
 
 #endif /* MM_CONTEXT_H */