[gnome-shell/gnome-3-6] loginDialog: don't rely on PAM to ask for a username

[Ray Strode <halfline src gnome org>]

commit dcbdae85ebe19245b0f5a2c11c160d0f35e3dd8d
Author: Ray Strode <rstrode redhat com>
Date:   Tue Oct 30 15:06:44 2012 -0400

    loginDialog: don't rely on PAM to ask for a username
    
    For the "Not Listed?" case we will need to be able
    to identify when the user has entered their username.
    
    Once we have a way of tracking when the username is
    entered, we can then defer showing the session list
    too early, before the user can reliably pick a
    session.
    
    This username tracking will also be important for
    implementing a disable-user-list configuration key.
    If the config key gets toggled off at runtime, we'll
    need to know if we're at a disruptive part of
    the authentication process or not, so we know whether
    we can can expose the user list right away, or wait
    until the authentication conversation finishes.
    
    Right now, we pass null in for an initial username,
    and let the PAM machinery ask the user, which means we
    have no good way of knowing when the username is entered.
    
    This commit changes the "Not Listed?" code to ask the
    user their username up front, before starting the PAM
    conversation in much the same way we do if the user
    picks a user from the user list.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=660660

 js/gdm/loginDialog.js |   22 ++++++++++++++++++----
 1 files changed, 18 insertions(+), 4 deletions(-)
---
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index 8f8544a..9826a30 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -949,6 +949,23 @@ const LoginDialog = new Lang.Class({
         return batch.run();
     },
 
+    _askForUsernameAndLogIn: function() {
+        this._promptLabel.set_text(_("Username: "));
+        this._promptEntry.set_text('');
+        this._promptEntry.clutter_text.set_password_char('');
+
+        let tasks = [this._showPrompt,
+
+                     function() {
+                         let userName = this._promptEntry.get_text();
+                         this._promptEntry.reactive = false;
+                         return this._beginVerificationForUser(userName);
+                     }];
+
+        let batch = new Batch.ConsecutiveBatch(this, tasks);
+        return batch.run();
+    },
+
     _onSessionOpened: function(client, serviceName) {
         this._greeter.call_start_session_when_ready_sync(serviceName, true, null);
     },
@@ -1095,10 +1112,7 @@ const LoginDialog = new Lang.Class({
                                                       this._fadeOutLogo]),
 
                      function() {
-                         let hold = new Batch.Hold();
-
-                         this._userVerifier.begin(null, hold);
-                         return hold;
+                         return this._askForUsernameAndLogIn();
                      }];
 
         let batch = new Batch.ConsecutiveBatch(this, tasks);