add GConf option to disable app monitoring

This option only disables timers, so that already collected is still provided to e.g. appDisplay. IMO that's required for privacy concerns...

configure.ac

@@ -20,6 +20,8 @@ AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE",
 
 PKG_PROG_PKG_CONFIG(0.16)
 
+AM_GCONF_SOURCE_2
+
 # We need at least this, since gst_plugin_register_static() was added
 # in 0.10.16, but nothing older than 0.10.21 has been tested.
 GSTREAMER_MIN_VERSION=0.10.16
@@ -38,7 +40,7 @@ fi
 
 AM_CONDITIONAL(BUILD_RECORDER, $build_recorder)
 
-PKG_CHECK_MODULES(MUTTER_PLUGIN, gtk+-2.0 dbus-glib-1 metacity-plugins gjs-gi-1.0 xscrnsaver libgnome-menu $recorder_modules gdk-x11-2.0 clutter-x11-0.9 clutter-glx-0.9)
+PKG_CHECK_MODULES(MUTTER_PLUGIN, gtk+-2.0 dbus-glib-1 metacity-plugins gjs-gi-1.0 xscrnsaver libgnome-menu $recorder_modules gconf-2.0 gdk-x11-2.0 clutter-x11-0.9 clutter-glx-0.9)
 PKG_CHECK_MODULES(TIDY, clutter-0.9)
 PKG_CHECK_MODULES(BIG, clutter-0.9 gtk+-2.0 librsvg-2.0)
 PKG_CHECK_MODULES(GDMUSER, dbus-glib-1 gtk+-2.0)

data/Makefile.am

@@ -3,3 +3,10 @@ imagedir = $(pkgdatadir)/images
 dist_image_DATA =		\
 	add-workspace.svg	\
 	remove-workspace.svg
+
+schemadir  = @GCONF_SCHEMA_FILE_DIR@
+schema_DATA = gnome-shell.schemas
+
+install-data-local:
+  GCONF_CONFIG_SOURCE=$(GCONF_SCHEMA_CONFIG_SOURCE) $(GCONFTOOL) --makefile-install-rule $(top_builddir)/data/$(schema_DATA)
+

data/gnome-shell.schemas

@@ -0,0 +1,20 @@
+<gconfschemafile>
+    <schemalist>
+
+      <schema>
+        <key>/schemas/desktop/gnome/shell/app_monitor/enable_monitoring</key>
+	<applyto>/desktop/gnome/shell/app_monitor/enable_monitoring</applyto>
+	<owner>gnome-shell</owner>
+	<type>bool</type>
+	<default>true</default>
+	<locale name="C">
+	  <short>Whether to collect stats about applications usage</short>
+	  <long>
+	    The shell normally monitors active applications in order to present the most used ones (e.g. in launchers). While this data will be kept private, you may want to disable this for privacy reasons. Please note that doing so won't remove already saved data.
+	  </long>
+	</locale>
+      </schema>
+
+  </schemalist>
+
+</gconfschemafile>

src/shell-app-monitor.c

@@ -8,6 +8,9 @@
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <gio/gio.h>
+#include <gconf/gconf.h>
+#include <gconf/gconf-client.h>
+
 
 #include "shell-app-monitor.h"
 #include "shell-global.h"
@@ -20,6 +23,8 @@
  * Copyright Red Hat, Inc. 2006-2008
  */
 
+#define APP_MONITOR_GCONF_DIR SHELL_GCONF_DIR"/app_monitor"
+
 /* Data is saved to file SHELL_CONFIG_DIR/DATA_FILENAME */
 #define DATA_FILENAME "applications_usage"
 
@@ -81,7 +86,9 @@ struct _ShellAppMonitor
   gulong last_idle;
   guint poll_id;
   guint save_apps_id;
+  guint gconf_notify;
   gboolean currently_idle;
+  gboolean enable_monitoring;
 
   GHashTable *apps_by_wm_class; /* Seen apps by wm_class */
   GHashTable *popularities; /* One AppPopularity struct list per activity */
@@ -133,6 +140,11 @@ static void save_to_file (ShellAppMonitor *monitor);
 
 static void restore_from_file (ShellAppMonitor *monitor);
 
+static void on_conf_changed (GConfClient *client,
+                             guint        cnxn_id,
+                             GConfEntry  *entry,
+                             gpointer     monitor);
+
 static glong
 get_time (void)
 {
@@ -182,9 +194,20 @@ shell_app_monitor_init (ShellAppMonitor *self)
   Display *xdisplay;
   char *path;
   char *shell_config_dir;
+  GConfClient *gconf_client;
   
   /* Apps usage tracking */
 
+  /* Check conf to see whether to track app usage or not */
+  gconf_client = gconf_client_get_default ();
+  gconf_client_add_dir (gconf_client, APP_MONITOR_GCONF_DIR,
+                        GCONF_CLIENT_PRELOAD_NONE, NULL);
+  self->gconf_notify =
+    gconf_client_notify_add (gconf_client, APP_MONITOR_GCONF_DIR"/enable_monitoring",
+                             on_conf_changed, self, NULL, NULL);
+  self->enable_monitoring =
+    gconf_client_get_bool (gconf_client, APP_MONITOR_GCONF_DIR"/enable_monitoring", NULL);
+
   /* FIXME: should we create as many monitors as there are GdkScreens? */
   display = gdk_display_get_default();
   xdisplay = GDK_DISPLAY_XDISPLAY (display);
@@ -218,10 +241,14 @@ shell_app_monitor_init (ShellAppMonitor *self)
   else
     self->upload_apps_burst_count = SAVE_APPS_BURST_LENGTH / SAVE_APPS_BURST_TIMEOUT;
 
-
+  /* If monitoring is disabled, we still report apps usage based on (possibly)
+   * saved data, but don't set timers */
+  if (self->enable_monitoring)
+    {
       self->poll_id = g_timeout_add_seconds (5, poll_for_idleness, self);
       self->save_apps_id =
         g_timeout_add_seconds (SAVE_APPS_BURST_TIMEOUT, on_save_apps_timeout, self);
+    }
 }
 
 static void
@@ -233,6 +260,7 @@ shell_app_monitor_finalize (GObject *object)
   XFree (self->info);
   g_source_remove (self->poll_id);
   g_source_remove (self->save_apps_id);
+  gconf_client_notify_remove (gconf_client_get_default (), self->gconf_notify);
   g_object_unref (self->display);
   g_hash_table_destroy (self->apps_by_wm_class);
   g_hash_table_foreach (self->popularities, destroy_popularity, NULL);
@@ -964,3 +992,37 @@ out:
         g_error_free (error);
       }
 }
+
+static void
+on_conf_changed (GConfClient *client,
+                 guint        cnxn_id,
+                 GConfEntry  *entry,
+                 gpointer     monitor)
+{
+  ShellAppMonitor *self = monitor;
+  GConfValue *value;
+  const char *key;
+  char *key_name;
+
+  key = gconf_entry_get_key (entry);
+  key_name = g_path_get_basename (key);
+  if (strcmp (key_name, "enable_monitoring") != 0)
+    {
+      g_free (key_name);
+      return;
+    }
+  value = gconf_entry_get_value (entry);
+  self->enable_monitoring = gconf_value_get_bool (value);
+
+  if (self->enable_monitoring)
+    {
+      self->poll_id = g_timeout_add_seconds (5, poll_for_idleness, self);
+      self->save_apps_id =
+        g_timeout_add_seconds (SAVE_APPS_BURST_TIMEOUT, on_save_apps_timeout, self);
+    }
+  else
+    {
+      g_source_remove (self->poll_id);
+      g_source_remove (self->save_apps_id);
+    }
+}

src/shell-global.h

@@ -19,6 +19,8 @@ typedef struct _ShellGlobalClass ShellGlobalClass;
 #define SHELL_IS_GLOBAL_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), SHELL_TYPE_GLOBAL))
 #define SHELL_GLOBAL_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), SHELL_TYPE_GLOBAL, ShellGlobalClass))
 
+#define SHELL_GCONF_DIR "/desktop/gnome/shell"
+
 struct _ShellGlobalClass
 {
   GObjectClass parent_class;