Add support for gdm greeter session

This commit adds GDM session support.

It provides a user list that talks to GDM,
handles authentication via PAM, etc.

It doesn't currently support fingerprint readers
and smartcards.

https://bugzilla.gnome.org/show_bug.cgi?id=657082

data/Makefile.am

@@ -29,6 +29,7 @@ dist_theme_DATA =				\
 	theme/dash-placeholder.svg		\
 	theme/filter-selected-ltr.svg		\
 	theme/filter-selected-rtl.svg		\
+	theme/gdm.css				\
 	theme/gnome-shell.css			\
 	theme/panel-border.svg			\
 	theme/panel-button-border.svg		\

data/theme/gdm.css

@@ -0,0 +1,161 @@
+/* Copyright 2011, Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Login Dialog */
+
+.login-dialog-title {
+    font-size: 14pt;
+    font-weight: bold;
+    color: #666666;
+    padding-bottom: 2em;
+}
+
+.login-dialog {
+    border-radius: 16px;
+    min-height: 150px;
+    max-height: 700px;
+    min-width: 350px;
+}
+
+.login-dialog-user-list-view {
+    -st-vfade-offset: 1em;
+}
+
+.login-dialog-user-list {
+    spacing: 12px;
+}
+
+.login-dialog-user-list-item {
+    color: #666666;
+}
+
+.login-dialog-user-list-item:ltr {
+    padding-right: 1em;
+}
+
+.login-dialog-user-list-item:rtl {
+    padding-left: 1em;
+}
+
+.login-dialog-user-list-item .login-dialog-user-list-item-name {
+    font-size: 20pt;
+    padding-left: 1em;
+    color: #666666;
+}
+
+.login-dialog-user-list-item:hover .login-dialog-user-list-item-name {
+    color: white;
+}
+
+.login-dialog-user-list-item:focus .login-dialog-user-list-item-name {
+    color: white;
+    text-shadow: black 0px 2px 2px;
+}
+
+.login-dialog-user-list-item-vertical-layout {
+    spacing: 2px;
+}
+
+.login-dialog-user-list-item .login-dialog-user-list-item-focus-bin {
+    background-color: rgba(0,0,0,0.0);
+    height: 2px;
+}
+
+.login-dialog-user-list-item:focus .login-dialog-user-list-item-focus-bin {
+    background-color: #666666;
+}
+
+.login-dialog-user-list-item-icon {
+    border: 2px solid #8b8b8b;
+    border-radius: 8px;
+    width: 64px;
+    height: 64px;
+}
+
+.login-dialog-not-listed-button {
+    padding-top: 2em;
+}
+.login-dialog-not-listed-label {
+    font-size: 14pt;
+    font-weight: bold;
+    color: #666666;
+}
+
+.login-dialog-prompt-layout {
+    padding-bottom: 64px;
+}
+.login-dialog-prompt-label {
+    color: white;
+    font-size: 20pt;
+}
+
+.login-dialog-prompt-entry {
+    padding: 4px;
+    border-radius: 4px;
+    border: 2px solid #5656cc;
+    color: black;
+    background-color: white;
+    caret-color: black;
+    caret-size: 1px;
+}
+
+.login-dialog-session-list {
+    color: #ffffff;
+    font-size: 10.5pt;
+}
+
+.login-dialog-session-list-button {
+    padding: 4px;
+}
+
+.login-dialog-session-list-button:focus {
+    background-color: #4c4c4c;
+}
+
+.login-dialog-session-list-button:active {
+    background-color: #4c4c4c;
+}
+
+.login-dialog-session-list-button:hover {
+    font-weight: bold;
+}
+
+.login-dialog-session-list-scroll-view {
+    background-gradient-start: rgba(80,80,80,0.3);
+    background-gradient-end: rgba(80,80,80,0.7);
+    background-gradient-direction: vertical;
+    box-shadow: inset 0px 2px 4px rgba(0,0,0,0.9);
+    border-radius: 8px;
+    border: 1px solid rgba(80,80,80,1.0);
+    padding: .5em;
+}
+
+.login-dialog-session-list-item:focus {
+    background-color: #666666;
+}
+
+.login-dialog-session-list-triangle {
+    padding-right: .5em;
+}
+
+.login-dialog-session-list-item-box {
+    spacing: .25em;
+}
+
+.login-dialog-session-list-item-dot {
+    width: .75em;
+    height: .75em;
+}

js/Makefile.am

@@ -3,6 +3,7 @@ jsdir = $(pkgdatadir)/js
 
 nobase_dist_js_DATA = 	\
 	gdm/batch.js		\
+	gdm/loginDialog.js	\
 	misc/config.js		\
 	misc/docInfo.js		\
 	misc/fileUtils.js	\

js/ui/main.js

@@ -71,6 +71,7 @@ let _errorLogStack = [];
 let _startDate;
 let _defaultCssStylesheet = null;
 let _cssStylesheet = null;
+let _gdmCssStylesheet = null;
 
 let background = null;
 
@@ -86,6 +87,17 @@ function _createUserSession() {
     networkAgent = new NetworkAgent.NetworkAgent();
 }
 
+function _createGDMSession() {
+    // We do this this here instead of at the top to prevent GDM
+    // related code from getting loaded in normal user sessions
+    const LoginDialog = imports.gdm.loginDialog;
+
+    let loginDialog = new LoginDialog.LoginDialog();
+    loginDialog.connect('loaded', function() {
+                            loginDialog.open();
+                        });
+}
+
 function _initRecorder() {
     let recorderSettings = new Gio.Settings({ schema: 'org.gnome.shell.recorder' });
 
@@ -175,6 +187,7 @@ function start() {
     global.stage.no_clear_hint = true;
 
     _defaultCssStylesheet = global.datadir + '/theme/gnome-shell.css';
+    _gdmCssStylesheet = global.datadir + '/theme/gdm.css';
     loadTheme();
 
     // Set up stage hierarchy to group all UI actors under one container.
@@ -197,7 +210,11 @@ function start() {
     keyboard = new Keyboard.Keyboard();
     notificationDaemon = new NotificationDaemon.NotificationDaemon();
     windowAttentionHandler = new WindowAttentionHandler.WindowAttentionHandler();
-    _createUserSession();
+
+    if (global.session_type == Shell.SessionType.USER)
+        _createUserSession();
+    else if (global.session_type == Shell.SessionType.GDM)
+        _createGDMSession();
 
     panel.startStatusArea();
 
@@ -434,6 +451,9 @@ function loadTheme() {
 
     let theme = new St.Theme ({ application_stylesheet: cssStylesheet });
 
+    if (global.session_type == Shell.SessionType.GDM)
+        theme.load_stylesheet(_gdmCssStylesheet);
+
     if (previousTheme) {
         let customStylesheets = previousTheme.get_custom_stylesheets();
 

js/ui/panel.js

@@ -45,6 +45,14 @@ try {
     log('NMApplet is not supported. It is possible that your NetworkManager version is too old');
 }
 
+const GDM_TRAY_ICON_ORDER = ['a11y', 'display', 'keyboard', 'volume', 'battery'];
+const GDM_TRAY_ICON_SHELL_IMPLEMENTATION = {
+    'a11y': imports.ui.status.accessibility.ATIndicator,
+    'volume': imports.ui.status.volume.Indicator,
+    'battery': imports.ui.status.power.Indicator,
+    'keyboard': imports.ui.status.keyboard.XKBIndicator
+};
+
 // To make sure the panel corners blend nicely with the panel,
 // we draw background and borders the same way, e.g. drawing
 // them as filled shapes from the outside inwards instead of
@@ -876,6 +884,14 @@ Panel.prototype = {
             this.actor.remove_style_class_name('in-overview');
         }));
 
+        if (global.session_type == Shell.SessionType.GDM) {
+            this._tray_icon_order = GDM_TRAY_ICON_ORDER;
+            this._tray_icon_shell_implementation = GDM_TRAY_ICON_SHELL_IMPLEMENTATION;
+        } else {
+            this._tray_icon_order = STANDARD_TRAY_ICON_ORDER;
+            this._tray_icon_shell_implementation = STANDARD_TRAY_ICON_SHELL_IMPLEMENTATION;
+        }
+
         this._menus = new PopupMenu.PopupMenuManager(this);
 
         this._leftBox = new St.BoxLayout({ name: 'panelLeft' });
@@ -1026,9 +1042,9 @@ Panel.prototype = {
     },
 
     startStatusArea: function() {
-        for (let i = 0; i < STANDARD_TRAY_ICON_ORDER.length; i++) {
+        for (let i = 0; i < this._tray_icon_order.length; i++) {
-            let role = STANDARD_TRAY_ICON_ORDER[i];
+            let role = this._tray_icon_order[i];
-            let constructor = STANDARD_TRAY_ICON_SHELL_IMPLEMENTATION[role];
+            let constructor = this._tray_icon_shell_implementation[role];
             if (!constructor) {
                 // This icon is not implemented (this is a bug)
                 continue;
@@ -1069,13 +1085,13 @@ Panel.prototype = {
     _onTrayIconAdded: function(o, icon, role) {
         icon.height = PANEL_ICON_SIZE;
 
-        if (STANDARD_TRAY_ICON_SHELL_IMPLEMENTATION[role]) {
+        if (this._tray_icon_shell_implementation[role]) {
             // This icon is legacy, and replaced by a Shell version
             // Hide it
             return;
         }
         // Figure out the index in our well-known order for this icon
-        let position = STANDARD_TRAY_ICON_ORDER.indexOf(role);
+        let position = this._tray_icon_order.indexOf(role);
         icon._rolePosition = position;
         let children = this._trayBox.get_children();
         let i;