# Description: Add support for smooth transition from Plymouth's bootsplash
#  If possible, KDM will try to deactivate plymouth, start X (with -nr) on
#  the active vt and leave the bootsplash on the screen until the graphical
#  login takes place.
# Forwarded: no
# Bug: https://bugs.launchpad.net/ubuntu/+source/kdebase-workspace/+bug/540177
# Author: Alberto Milone <alberto.milone@canonical.com>
#

Index: kdm/backend/dm.c
===================================================================
--- kdm/backend/dm.c
+++ kdm/backend/dm.c	2010-05-05 17:33:05.000000000 +0200
@@ -1330,6 +1330,82 @@
 	return activeVTs;
 }
 
+/* Return the active VT as an integer */
+static int
+get_active_vt (void)
+{
+        int console_fd;
+        struct vt_stat console_state = { 0 };
+        console_fd = open ("/dev/tty0", O_RDONLY | O_NOCTTY);
+        if (console_fd < 0) {
+                goto out;
+        }
+        if (ioctl (console_fd, VT_GETSTATE, &console_state) < 0) {
+                goto out;
+        }
+out:
+        if (console_fd >= 0) {
+                close (console_fd);
+        }
+        return console_state.v_active;
+}
+
+static int
+plymouth_is_running (void)
+{
+        int status;
+        status = system ("/bin/plymouth --ping");
+
+        return WIFEXITED (status) && WEXITSTATUS (status) == 0;
+}
+
+static int
+plymouth_has_active_vt (void)
+{
+        int status;
+        status = system ("/bin/plymouth --has-active-vt");
+
+        return WIFEXITED (status) && WEXITSTATUS (status) == 0;
+}
+
+static int
+plymouth_prepare_for_transition (void)
+{
+        int status;
+        status = system ("/bin/plymouth deactivate");
+
+        return WIFEXITED (status) && WEXITSTATUS (status) == 0;
+}
+
+int
+plymouth_quit_with_transition (void)
+{
+        int status;
+        status = system ("/bin/plymouth quit --retain-splash");
+
+        return WIFEXITED (status) && WEXITSTATUS (status) == 0;
+}
+
+static int
+plymouth_quit_without_transition (void)
+{
+        int status;
+        status = system ("/bin/plymouth quit");
+
+        return WIFEXITED (status) && WEXITSTATUS (status) == 0;
+}
+
+static int
+triggered_to_force_display_on_active_vt (void)
+{
+   int should_force_display_on_active_vt;
+   should_force_display_on_active_vt=open("/var/spool/gdm/force-display-on-active-vt", O_RDONLY);
+   if ( should_force_display_on_active_vt >= 0 )
+     close(should_force_display_on_active_vt);
+   unlink("/var/spool/gdm/force-display-on-active-vt");
+   return should_force_display_on_active_vt;
+}
+
 static void
 allocateVT( struct display *d )
 {
@@ -1339,6 +1415,43 @@
 	if ((d->displayType & d_location) == dLocal &&
 	    d->status == notRunning && !d->serverVT && d->reqSrvVT >= 0)
 	{
+       /* check for pymouth using old/deprecated method first */
+     if ( triggered_to_force_display_on_active_vt() >= 0 ) {
+           int vt;
+           vt = get_active_vt();
+           if (vt > 0) {
+             d->serverVT = vt;
+             return;
+         }
+     }
+
+       /* check for plymouth using newer methods */
+       d->plymouth_is_running = plymouth_is_running ();
+     if (d->plymouth_is_running) {
+           /* call plymouth deactivate */
+         plymouth_prepare_for_transition ();
+           if (plymouth_has_active_vt ()) {
+             /* plymouth was displaying a splash screen and has
+                 * terminated leaving it on screen
+                 */
+               int vt;
+             vt = get_active_vt ();
+             if (vt > 0) {
+                   /* start the X server on the active vt */
+                 d->serverVT = vt;
+                   return;
+               }
+           }
+           else {
+             /* plymouth might have been running but did not display
+                 * a splash screen.
+                 */ 
+              
+                /* call plymouth quit and start the X server as usual */
+               d->plymouth_is_running = !plymouth_quit_without_transition ();
+         }
+    }
+
 		if (d->reqSrvVT && d->reqSrvVT < 16)
 			d->serverVT = d->reqSrvVT;
 		else {
Index: kdm/backend/dm.h
===================================================================
--- kdm/backend/dm.h
+++ kdm/backend/dm.h	2010-05-05 17:33:05.000000000 +0200
@@ -291,6 +291,7 @@
 	Xauth **authorizations;     /* authorization data */
 	int authNum;                /* number of authorizations */
 	char *authFile;             /* file to store authorization in */
+    int plymouth_is_running;    /* Plymouth's status */
 };
 
 #define d_location   1
@@ -403,6 +404,8 @@
 void forEachDisplay( void (*f)( struct display * ) );
 #ifdef HAVE_VTS
 void forEachDisplayRev( void (*f)( struct display * ) );
+/* function for plymouth */
+int plymouth_quit_with_transition (void);
 #endif
 void removeDisplay( struct display *old );
 struct display
Index: kdm/backend/server.c
===================================================================
--- kdm/backend/server.c
+++ kdm/backend/server.c	2010-05-05 17:33:05.000000000 +0200
@@ -134,6 +134,11 @@
 	struct display *d = startingServer;
 	d->serverStatus = ignore;
 	serverTimeout = TO_INF;
+    if (d->plymouth_is_running) {
+      debug( "Quitting Plymouth with transition\n" );
+      d->plymouth_is_running = !plymouth_quit_with_transition ();
+      debug ("Is Plymouth still running? %s\n", d->plymouth_is_running ? "yes" : "no");
+    }
 	debug( "X server ready, starting session\n" );
 	startDisplayP2( d );
 }