[PATCH] Allow devices to inhibit autoconnect through a signal

[Daniel Drake <dsd laptop org>]

This allows a device (or a companion) to signal that it is not a good
time for a specific device to autoconnect to a network.
---
 src/NetworkManagerPolicy.c |    2 +-
 src/nm-device.c            |   45 ++++++++++++++++++++++++++++++++++++++++++++
 src/nm-device.h            |    1 +
 3 files changed, 47 insertions(+), 1 deletions(-)

diff --git a/src/NetworkManagerPolicy.c b/src/NetworkManagerPolicy.c
index 6bba92f..e2d4c95 100644
--- a/src/NetworkManagerPolicy.c
+++ b/src/NetworkManagerPolicy.c
@@ -726,7 +726,7 @@ schedule_activate_check (NMPolicy *policy, NMDevice *device)
 	if (state < NM_DEVICE_STATE_DISCONNECTED)
 		return;
 
-	if (!nm_device_can_activate (device))
+	if (!nm_device_can_activate (device) || !nm_device_autoconnect_allowed (device))
 		return;
 
 	for (iter = policy->pending_activation_checks; iter; iter = g_slist_next (iter)) {
diff --git a/src/nm-device.c b/src/nm-device.c
index 5826a2a..488b2cf 100644
--- a/src/nm-device.c
+++ b/src/nm-device.c
@@ -50,11 +50,19 @@
 #include "nm-setting-connection.h"
 #include "nm-dnsmasq-manager.h"
 #include "nm-dhcp4-config.h"
+#include "nm-marshal.h"
 
 #define NM_ACT_REQUEST_IP4_CONFIG "nm-act-request-ip4-config"
 
 static void device_interface_init (NMDeviceInterface *device_interface_class);
 
+enum {
+	AUTOCONNECT_ALLOWED,
+	LAST_SIGNAL,
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
 G_DEFINE_TYPE_EXTENDED (NMDevice, nm_device, G_TYPE_OBJECT,
 						G_TYPE_FLAG_ABSTRACT,
 						G_IMPLEMENT_INTERFACE (NM_TYPE_DEVICE_INTERFACE,
@@ -360,6 +368,34 @@ nm_device_can_activate (NMDevice *self)
 	return TRUE;
 }
 
+static gboolean
+autoconnect_allowed_accumulator (GSignalInvocationHint *ihint,
+                                 GValue *return_accu,
+                                 const GValue *handler_return, gpointer data)
+{
+	if (!g_value_get_boolean (handler_return))
+		g_value_set_boolean (return_accu, FALSE);
+	return TRUE;
+}
+
+gboolean
+nm_device_autoconnect_allowed (NMDevice *self)
+{
+	GValue instance = { 0, };
+	GValue retval = { 0, };
+
+	g_value_init (&instance, G_TYPE_OBJECT);
+	g_value_take_object (&instance, self);
+
+	g_value_init (&retval, G_TYPE_BOOLEAN);
+	g_value_set_boolean (&retval, TRUE);
+
+	/* Use g_signal_emitv() rather than g_signal_emit() to avoid the return
+	 * value being changed if no handlers are connected */
+	g_signal_emitv (&instance, signals[AUTOCONNECT_ALLOWED], 0, &retval);
+	return g_value_get_boolean (&retval);
+}
+
 NMConnection *
 nm_device_get_best_auto_connection (NMDevice *dev,
                                     GSList *connections,
@@ -2380,6 +2416,15 @@ nm_device_class_init (NMDeviceClass *klass)
 	g_object_class_override_property (object_class,
 									  NM_DEVICE_INTERFACE_PROP_MANAGED,
 									  NM_DEVICE_INTERFACE_MANAGED);
+
+	signals[AUTOCONNECT_ALLOWED] =
+		g_signal_new ("autoconnect-allowed",
+		              G_OBJECT_CLASS_TYPE (object_class),
+		              G_SIGNAL_RUN_LAST,
+		              0,
+		              autoconnect_allowed_accumulator, NULL,
+		              _nm_marshal_BOOLEAN__VOID,
+		              G_TYPE_BOOLEAN, 0);
 }
 
 static gboolean
diff --git a/src/nm-device.h b/src/nm-device.h
index 9084816..b230da8 100644
--- a/src/nm-device.h
+++ b/src/nm-device.h
@@ -159,6 +159,7 @@ void			nm_device_activate_schedule_stage4_ip_config_timeout	(NMDevice *device);
 gboolean		nm_device_deactivate_quickly	(NMDevice *dev);
 gboolean		nm_device_is_activating		(NMDevice *dev);
 gboolean		nm_device_can_interrupt_activation		(NMDevice *self);
+gboolean		nm_device_autoconnect_allowed	(NMDevice *self);
 
 NMDeviceState nm_device_get_state (NMDevice *device);
 
-- 
1.6.2.5


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