[gnome-session/gnome-3-6] systemd: check for greeter by looking at class not service

[Ray Strode <halfline src gnome org>]

commit cbafefe942c2a2bdbcfbc1cd6a6cc1480c363f26
Author: Ray Strode <rstrode redhat com>
Date:   Fri Sep 21 16:51:22 2012 -0400

    systemd: check for greeter by looking at class not service
    
    GDM calls its pam service file gdm-launch-environment not gdm-welcome,
    so the current login session detection code is broken. It's fragile anyway.
    
    A much better approach is to query if the session class is "greeter".
    
    This commit does that.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=684585
    (cherry picked from commit c8253d1094b5ede0b3f23a59b3567193c7039341)

 gnome-session/gsm-systemd.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/gnome-session/gsm-systemd.c b/gnome-session/gsm-systemd.c
index 6844aad..a8597b2 100644
--- a/gnome-session/gsm-systemd.c
+++ b/gnome-session/gsm-systemd.c
@@ -364,7 +364,7 @@ gsm_systemd_is_login_session (GsmSystem *system)
         GsmSystemd *manager = GSM_SYSTEMD (system);
         int res;
         gboolean ret;
-        gchar *service = NULL;
+        gchar *session_class = NULL;
 
         ret = FALSE;
 
@@ -372,13 +372,13 @@ gsm_systemd_is_login_session (GsmSystem *system)
                 return ret;
         }
 
-        res = sd_session_get_service (manager->priv->session_id, &service);
+        res = sd_session_get_class (manager->priv->session_id, &session_class);
         if (res < 0) {
-                g_warning ("could not get pam service: %s", strerror (-res));
+                g_warning ("could not get session class: %s", strerror (-res));
                 return FALSE;
         }
-        ret = (g_strcmp0 (service, "gdm-welcome") == 0);
-        free (service);
+        ret = (g_strcmp0 (session_class, "greeter") == 0);
+        free (session_class);
 
         return ret;
 }