~super-friends/unity-lens-friends/13.04

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/*
 * Copyright (C) 2010-2012 Canonical Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.    See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.    If not, see <http://www.gnu.org/licenses/>.
 *
 * Authored by Mikkel Kamstrup Erlandsen <mikkel.kamstrup@canonical.com>
 *                         Ken VanDine <ken.vandine@canonical.com>
 *
 */

using GLib;
using Config;

namespace UnityFriends {

    static Application? app = null;
    static Daemon? daemon = null;

    /* Check if a given well known DBus is owned.
     * WARNING: This does sync IO!    */
    public static bool dbus_name_has_owner (string name)
    {
        try {
            bool has_owner;
            DBusConnection bus = Bus.get_sync (BusType.SESSION);
            Variant result = bus.call_sync ("org.freedesktop.DBus",
                                            "/org/freedesktop/dbus",
                                            "org.freedesktop.DBus",
                                            "NameHasOwner",
                                            new Variant ("(s)", name),
                                            new VariantType ("(b)"),
                                            DBusCallFlags.NO_AUTO_START,
                                            -1);
            result.get ("(b)", out has_owner);
            return has_owner;
        } catch (Error e) {
            warning ("Unable to decide if '%s' is running: %s", name, e.message);
        }
        
        return false;
    }

    public static int main (string[] args)
    {
        /* Sort up locale to get translations but also sorting and
         * punctuation right */
        GLib.Intl.textdomain (Config.PACKAGE);
        GLib.Intl.bindtextdomain (Config.PACKAGE, Config.LOCALE_DIR);
        GLib.Intl.bind_textdomain_codeset (Config.PACKAGE, "UTF-8");
        GLib.Intl.setlocale (GLib.LocaleCategory.ALL, "");
    
        /* Make sure the desktop appinfos are picked up correctly */
        DesktopAppInfo.set_desktop_env ("GNOME");
    
        /* Workaround for https://bugzilla.gnome.org/show_bug.cgi?id=640714 
         * GApplication.register() call owns our DBus name in a sync manner
         * making it race against GDBus' worker thread to export our
         * objects on the bus before/after owning our name and receiving
         * method calls on our objects (which may not yet be up!)*/
        if (dbus_name_has_owner ("com.canonical.Unity.Lens.Friends"))
        {
            print ("Another instance of the Unity Friends Daemon " +
                   "already appears to be running.\nBailing out.\n");
            return 2;
        }
        
        /* Now register our DBus objects *before* acquiring the name!
         * See above for reasons */
        daemon = new Daemon ();
    
        /* Use GApplication directly for single instance app functionality */
        app = new Application ("com.canonical.Unity.Lens.Friends",
                               ApplicationFlags.IS_SERVICE);
        try {
            app.register ();
        } catch (Error e) {
            /* FIXME: We get this error if another daemon is already running,
             * but it uses a generic error so we can't detect this reliably... */
            print ("Failed to start files daemon: %s\n", e.message);
            return 1;
        }
        
        if (app.get_is_remote ())
            {
                print ("Another instance of the Unity Friends Daemon " +
                       "already appears to be running.\nBailing out.\n");
                return 2;
            }
        
        /* Holding the app makes sure the GApplication doesn't exit */        
        app.hold();
        return app.run ();
    }

} /* namespace */