[gnome-shell] UserMenu: show "Install Updates & Restart" when appropriate

[Giovanni Campagna <gcampagna src gnome org>]

commit 34831796f616d4b8d5fbf7fa74fcf3b6967f1d53
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sun Jun 3 17:35:37 2012 +0200

    UserMenu: show "Install Updates & Restart" when appropriate
    
    When PackageKit signals that it prepared an update, offer an option
    to reboot and apply it, using a helper that will setup the next
    reboot and then calling to gnome-session.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=677394

 js/misc/gnomeSession.js |    1 +
 js/ui/userMenu.js       |   22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/js/misc/gnomeSession.js b/js/misc/gnomeSession.js
index dabd1b1..f8bd58e 100644
--- a/js/misc/gnomeSession.js
+++ b/js/misc/gnomeSession.js
@@ -50,6 +50,7 @@ const SessionManagerIface = <interface name="org.gnome.SessionManager">
     <arg type="u" direction="in" />
 </method>
 <method name="Shutdown" />
+<method name="Reboot" />
 <method name="CanShutdown">
     <arg type="b" direction="out" />
 </method>
diff --git a/js/ui/userMenu.js b/js/ui/userMenu.js
index 4dd9057..f8a57d2 100644
--- a/js/ui/userMenu.js
+++ b/js/ui/userMenu.js
@@ -523,6 +523,10 @@ const UserMenuButton = new Lang.Class({
         this._updateLogout();
         this._updateLockScreen();
 
+        this._updatesFile = Gio.File.new_for_path('/var/lib/PackageKit/prepared-update');
+        this._updatesMonitor = this._updatesFile.monitor(Gio.FileMonitorFlags.NONE, null);
+        this._updatesMonitor.connect('changed', Lang.bind(this, this._updateInstallUpdates));
+
         // Whether shutdown is available or not depends on both lockdown
         // settings (disable-log-out) and Polkit policy - the latter doesn't
         // notify, so we update the menu item each time the menu opens or
@@ -578,11 +582,17 @@ const UserMenuButton = new Lang.Class({
         this._lockScreenItem.actor.visible = allowLockScreen;
     },
 
+    _updateInstallUpdates: function() {
+        let haveUpdates = this._updatesFile.query_exists(null);
+        this._installUpdatesItem.actor.visible = haveUpdates && this._haveShutdown;
+    },
+
     _updateHaveShutdown: function() {
         this._session.CanShutdownRemote(Lang.bind(this,
             function(result, error) {
                 if (!error) {
                     this._haveShutdown = result[0];
+                    this._updateInstallUpdates();
                     this._updateSuspendOrPowerOff();
                 }
             }));
@@ -711,6 +721,11 @@ const UserMenuButton = new Lang.Class({
         item = new PopupMenu.PopupSeparatorMenuItem();
         this.menu.addMenuItem(item);
 
+        item = new PopupMenu.PopupMenuItem(_("Install Updates & Restart"));
+        item.connect('activate', Lang.bind(this, this._onInstallUpdatesActivate));
+        this.menu.addMenuItem(item);
+        this._installUpdatesItem = item;
+
         item = new PopupMenu.PopupAlternatingMenuItem(_("Power Off"),
                                                       _("Suspend"));
         this.menu.addMenuItem(item);
@@ -769,6 +784,13 @@ const UserMenuButton = new Lang.Class({
         this._session.LogoutRemote(0);
     },
 
+    _onInstallUpdatesActivate: function() {
+        Main.overview.hide();
+        Util.spawn(['pkexec', '/usr/libexec/pk-trigger-offline-update']);
+
+        this._session.RebootRemote();
+    },
+
     _onSuspendOrPowerOffActivate: function() {
         Main.overview.hide();