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From 2843a951ef826afd01fa3c7340780b1929db38c7 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Tue, 4 Sep 2018 08:12:34 +0200
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Subject: [PATCH 35/51] local-display-factory: Remove initial VT is in use
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check
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The initial VT is in use check in on_vt_changed() is racy, when switching
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to VT1 from an active session, on_vt_changed() may run before logind has
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processed the VT change and then sd_seat_get_active() will return the
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active session which we are switching away from. This results in the greeter
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not being started on VT1.
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On my system gdm reliably wins the race resulting in not getting a greeter
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when manually switching from an active session to VT1.
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gdm already starts the greeter unconditionally from
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gdm_local_display_factory_sync_seats() on both startup and when an user
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session exits. gdm also starts it unconditionally when selecting
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"Switch user" from an user session.
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Now autologin sessions avoid the initial VT as well.
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So we now can assume that the initial VT is free for the login screen's
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use. And create_display already checks for and re-uses
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an existing greeter, so we can safely remove the racy check.
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---
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daemon/gdm-local-display-factory.c | 13 -------------
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1 file changed, 13 deletions(-)
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diff --git a/daemon/gdm-local-display-factory.c b/daemon/gdm-local-display-factory.c
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index 13d56dcff..8e46dbca2 100644
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--- a/daemon/gdm-local-display-factory.c
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+++ b/daemon/gdm-local-display-factory.c
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@@ -752,73 +752,60 @@ on_vt_changed (GIOChannel *source,
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g_debug ("GdmLocalDisplayFactory: tty of login window is %s", tty_of_login_window_vt);
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if (g_strcmp0 (tty_of_login_window_vt, tty_of_previous_vt) == 0) {
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GdmDisplayStore *store;
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GdmDisplay *display;
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g_debug ("GdmLocalDisplayFactory: VT switched from login window");
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store = gdm_display_factory_get_display_store (GDM_DISPLAY_FACTORY (factory));
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display = gdm_display_store_find (store,
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lookup_by_session_id,
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(gpointer) login_session_id);
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if (display != NULL)
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maybe_stop_greeter_in_background (factory, display);
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} else {
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g_debug ("GdmLocalDisplayFactory: VT not switched from login window");
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}
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}
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}
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/* if user jumped back to initial vt and it's empty put a login screen
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* on it (unless a login screen is already running elsewhere, then
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* jump to that login screen)
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*/
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if (strcmp (factory->priv->tty_of_active_vt, tty_of_initial_vt) != 0) {
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g_debug ("GdmLocalDisplayFactory: active VT is not initial VT, so ignoring");
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return G_SOURCE_CONTINUE;
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}
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- ret = sd_seat_get_active ("seat0", &active_session_id, NULL);
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-
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- if (ret == 0) {
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- g_autofree char *state = NULL;
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- ret = sd_session_get_state (active_session_id, &state);
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-
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- /* if there's something already running on the active VT then bail */
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- if (ret == 0 && g_strcmp0 (state, "closing") != 0) {
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- g_debug ("GdmLocalDisplayFactory: initial VT is in use, so ignoring");
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- return G_SOURCE_CONTINUE;
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- }
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- }
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-
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if (gdm_local_display_factory_use_wayland ())
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session_type = "wayland";
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g_debug ("GdmLocalDisplayFactory: creating new display on seat0 because of VT change");
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create_display (factory, "seat0", session_type, TRUE);
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return G_SOURCE_CONTINUE;
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}
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#endif
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static void
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gdm_local_display_factory_start_monitor (GdmLocalDisplayFactory *factory)
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{
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g_autoptr (GIOChannel) io_channel = NULL;
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factory->priv->seat_new_id = g_dbus_connection_signal_subscribe (factory->priv->connection,
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"org.freedesktop.login1",
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"org.freedesktop.login1.Manager",
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"SeatNew",
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"/org/freedesktop/login1",
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NULL,
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G_DBUS_SIGNAL_FLAGS_NONE,
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on_seat_new,
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g_object_ref (factory),
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g_object_unref);
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factory->priv->seat_removed_id = g_dbus_connection_signal_subscribe (factory->priv->connection,
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"org.freedesktop.login1",
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"org.freedesktop.login1.Manager",
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"SeatRemoved",
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--
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2.27.0
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