Fix LightDM failing to start greeters on remote X servers.

This change caused the VNC support to break, so contains some logic
fixes for that.

4 files changed, 69 insertions, 6 deletions

diff --git a/src/seat.c b/src/seat.c
index c7ed63c9..8b10d139 100644
--- a/src/seat.c
+++ b/src/seat.c
@@ -640,11 +640,6 @@ session_stopped_cb (Session *session, Seat *seat)
     }
 
     display_server = session_get_display_server (session);
-    if (!display_server)
-    {
-        g_object_unref (session);
-        return;
-    }
 
     /* Cleanup */
     if (!IS_GREETER (session))
@@ -1300,7 +1295,7 @@ seat_switch_to_greeter (Seat *seat)
 
     g_return_val_if_fail (seat != NULL, FALSE);
 
-    if (!seat_get_can_switch (seat))
+    if (!seat_get_can_switch (seat) && seat->priv->sessions != NULL)
         return FALSE;
 
     /* Switch to greeter if one open (shouldn't be though) */
@@ -1321,6 +1316,10 @@ seat_switch_to_greeter (Seat *seat)
     seat->priv->session_to_activate = g_object_ref (greeter_session);
 
     display_server = create_display_server (seat, SESSION (greeter_session));
+    if (!display_server) {
+        g_clear_object (&seat->priv->session_to_activate);
+        return FALSE;
+    }
     session_set_display_server (SESSION (greeter_session), display_server);
     if (!display_server_start (display_server))
         return FALSE;
diff --git a/tests/Makefile.am b/tests/Makefile.am
index f28f2e5c..81299eea 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -163,6 +163,7 @@ TESTS = \
 	test-vnc-guest \
 	test-xremote-autologin \
 	test-xremote-login \
+	test-xremote-login-logout \
 	test-xdmcp-client \
 	test-xdmcp-client-xorg-1.16 \
 	test-xdmcp-server-autologin \
@@ -597,6 +598,7 @@ EXTRA_DIST = \
 	scripts/xdmcp-server-xdm-authentication-short-data.conf \
 	scripts/xremote-autologin.conf \
 	scripts/xremote-login.conf \
+	scripts/xremote-login-logout.conf \
 	scripts/xserver-config.conf \
 	scripts/xserver-fail-start.conf \
 	scripts/xserver-no-share.conf
diff --git a/tests/scripts/xremote-login-logout.conf b/tests/scripts/xremote-login-logout.conf
new file mode 100644
index 00000000..2dee5653
--- /dev/null
+++ b/tests/scripts/xremote-login-logout.conf
@@ -0,0 +1,60 @@
+#
+# Check logging out with a remote X server switches back to a greeter
+#
+
+[SeatDefaults]
+type=xremote
+user-session=default
+xserver-hostname=127.0.0.1
+xserver-display-number=98
+
+# Start a remote X server to use
+#?*START-XSERVER ARGS=":98 -listen tcp"
+#?XSERVER-98 START LISTEN-TCP
+
+#?*START-DAEMON
+#?RUNNER DAEMON-START
+
+# LightDM connects to X server
+#?XSERVER-98 ACCEPT-CONNECT
+
+# Greeter starts
+#?GREETER-X-127.0.0.1:98 START XDG_SEAT=seat0 XDG_SESSION_CLASS=greeter
+#?LOGIN1 ACTIVATE-SESSION SESSION=c0
+#?XSERVER-98 ACCEPT-CONNECT
+#?GREETER-X-127.0.0.1:98 CONNECT-XSERVER
+#?GREETER-X-127.0.0.1:98 CONNECT-TO-DAEMON
+#?GREETER-X-127.0.0.1:98 CONNECTED-TO-DAEMON
+
+# Log into account with a password
+#?*GREETER-X-127.0.0.1:98 AUTHENTICATE USERNAME=have-password1
+#?GREETER-X-127.0.0.1:98 SHOW-PROMPT TEXT="Password:"
+#?*GREETER-X-127.0.0.1:98 RESPOND TEXT="password"
+#?GREETER-X-127.0.0.1:98 AUTHENTICATION-COMPLETE USERNAME=have-password1 AUTHENTICATED=TRUE
+#?*GREETER-X-127.0.0.1:98 START-SESSION
+#?GREETER-X-127.0.0.1:98 TERMINATE SIGNAL=15
+
+# Session starts
+#?SESSION-X-127.0.0.1:98 START XDG_SEAT=seat0 DESKTOP_SESSION=default USER=have-password1
+#?LOGIN1 ACTIVATE-SESSION SESSION=c1
+#?XSERVER-98 ACCEPT-CONNECT
+#?SESSION-X-127.0.0.1:98 CONNECT-XSERVER
+
+# Logout session
+#?*SESSION-X-127.0.0.1:98 LOGOUT
+
+# LightDM connects to X server
+#?XSERVER-98 ACCEPT-CONNECT
+
+# Greeter starts
+#?GREETER-X-127.0.0.1:98 START XDG_SEAT=seat0 XDG_SESSION_CLASS=greeter
+#?LOGIN1 ACTIVATE-SESSION SESSION=c2
+#?XSERVER-98 ACCEPT-CONNECT
+#?GREETER-X-127.0.0.1:98 CONNECT-XSERVER
+#?GREETER-X-127.0.0.1:98 CONNECT-TO-DAEMON
+#?GREETER-X-127.0.0.1:98 CONNECTED-TO-DAEMON
+
+# Cleanup
+#?*STOP-DAEMON
+#?GREETER-X-127.0.0.1:98 TERMINATE SIGNAL=15
+#?RUNNER DAEMON-EXIT STATUS=0
diff --git a/tests/test-xremote-login-logout b/tests/test-xremote-login-logout
new file mode 100755
index 00000000..37698e1e
--- /dev/null
+++ b/tests/test-xremote-login-logout
@@ -0,0 +1,2 @@
+#!/bin/sh
+./src/dbus-env ./src/test-runner xremote-login-logout test-gobject-greeter