From 12ca3bb66bcce1dabdd8d0db1322ab9626d16df4 Mon Sep 17 00:00:00 2001
From: Fabio Erculiani <lxnay@sabayon.org>
Date: Thu, 9 May 2013 17:33:11 +0200
Subject: [PATCH] Detect logind/consolekit at runtime

if --systemd is passed to configure, systemd support is enabled but the
code will fallback to ConsoleKit at runtime if logind is not running.
This makes possible to support both ConsoleKit and LoginD implementation
by detecting the currently running one at runtime.
---
 xfce4-session/Makefile.am     |  7 ++---
 xfce4-session/xfsm-shutdown.c | 67 +++++++++++++++++++++++++++----------------
 2 files changed, 46 insertions(+), 28 deletions(-)

diff --git a/xfce4-session/Makefile.am b/xfce4-session/Makefile.am
index 5472b33..690fd77 100644
--- a/xfce4-session/Makefile.am
+++ b/xfce4-session/Makefile.am
@@ -63,14 +63,13 @@ xfce4_session_SOURCES =							\
 	xfsm-upower.c							\
 	xfsm-upower.h
 
+xfce4_session_SOURCES +=						\
+	xfsm-consolekit.c						\
+	xfsm-consolekit.h
 if HAVE_SYSTEMD
 xfce4_session_SOURCES +=						\
 	xfsm-systemd.c							\
 	xfsm-systemd.h
-else
-xfce4_session_SOURCES +=						\
-	xfsm-consolekit.c						\
-	xfsm-consolekit.h
 endif
 
 xfce4_session_CFLAGS =							\
diff --git a/xfce4-session/xfsm-shutdown.c b/xfce4-session/xfsm-shutdown.c
index 4c483a7..bbbd0066 100644
--- a/xfce4-session/xfsm-shutdown.c
+++ b/xfce4-session/xfsm-shutdown.c
@@ -68,10 +68,11 @@
 #include <xfce4-session/xfsm-legacy.h>
 #include <xfce4-session/xfsm-upower.h>
 
+#include <xfce4-session/xfsm-consolekit.h>
+
 #ifdef HAVE_SYSTEMD
+#define LOGIND_RUNNING() (access("/run/systemd/seats/", F_OK) >= 0)
 #include <xfce4-session/xfsm-systemd.h>
-#else
-#include <xfce4-session/xfsm-consolekit.h>
 #endif
 
 static void xfsm_shutdown_finalize  (GObject      *object);
@@ -96,11 +97,8 @@ struct _XfsmShutdown
 {
   GObject __parent__;
 
-#ifdef HAVE_SYSTEMD
   XfsmSystemd    *systemd;
-#else
   XfsmConsolekit *consolekit;
-#endif
   XfsmUPower     *upower;
 
   /* kiosk settings */
@@ -138,11 +136,20 @@ xfsm_shutdown_init (XfsmShutdown *shutdown)
 {
   XfceKiosk *kiosk;
 
+  shutdown->systemd = NULL;
+  shutdown->consolekit = NULL;
+
 #ifdef HAVE_SYSTEMD
-  shutdown->systemd = xfsm_systemd_get ();
-#else
-  shutdown->consolekit = xfsm_consolekit_get ();
+  if (LOGIND_RUNNING())
+    {
+      shutdown->systemd = xfsm_systemd_get ();
+      goto out; /* skip ConsoleKit initialization */
+    }
+  /* fallback to ConsoleKit, logind is not running */
 #endif
+  shutdown->consolekit = xfsm_consolekit_get ();
+
+ out:
   shutdown->upower = xfsm_upower_get ();
   shutdown->helper_state = SUDO_NOT_INITIAZED;
   shutdown->helper_require_password = FALSE;
@@ -161,11 +168,8 @@ xfsm_shutdown_finalize (GObject *object)
 {
   XfsmShutdown *shutdown = XFSM_SHUTDOWN (object);
 
-#ifdef HAVE_SYSTEMD
   g_object_unref (G_OBJECT (shutdown->systemd));
-#else
   g_object_unref (G_OBJECT (shutdown->consolekit));
-#endif
   g_object_unref (G_OBJECT (shutdown->upower));
 
   /* close down helper */
@@ -655,12 +659,13 @@ xfsm_shutdown_try_restart (XfsmShutdown  *shutdown,
 
   if (shutdown->helper_state == SUDO_AVAILABLE)
     return xfsm_shutdown_sudo_try_action (shutdown, XFSM_SHUTDOWN_RESTART, error);
-  else
+
 #ifdef HAVE_SYSTEMD
-    return xfsm_systemd_try_restart (shutdown->systemd, error);
-#else
-    return xfsm_consolekit_try_restart (shutdown->consolekit, error);
+  if (LOGIND_RUNNING())
+      return xfsm_systemd_try_restart (shutdown->systemd, error);
+  /* fallback to ConsoleKit, logind is not running */
 #endif
+  return xfsm_consolekit_try_restart (shutdown->consolekit, error);
 }
 
 
@@ -676,12 +681,13 @@ xfsm_shutdown_try_shutdown (XfsmShutdown  *shutdown,
 
   if (shutdown->helper_state == SUDO_AVAILABLE)
     return xfsm_shutdown_sudo_try_action (shutdown, XFSM_SHUTDOWN_SHUTDOWN, error);
-  else
+
 #ifdef HAVE_SYSTEMD
+  if (LOGIND_RUNNING())
     return xfsm_systemd_try_shutdown (shutdown->systemd, error);
-#else
-    return xfsm_consolekit_try_shutdown (shutdown->consolekit, error);
+  /* fallback to ConsoleKit, logind is not running */
 #endif
+  return xfsm_consolekit_try_shutdown (shutdown->consolekit, error);
 }
 
 
@@ -722,12 +728,18 @@ xfsm_shutdown_can_restart (XfsmShutdown  *shutdown,
     }
 
 #ifdef HAVE_SYSTEMD
-  if (xfsm_systemd_can_restart (shutdown->systemd, can_restart, error))
-#else
-  if (xfsm_consolekit_can_restart (shutdown->consolekit, can_restart, error))
+  if (LOGIND_RUNNING())
+    {
+      if (xfsm_systemd_can_restart (shutdown->systemd, can_restart, error))
+        return TRUE;
+      goto out; /* skip ConsoleKit polling, logind is running */
+    }
+  /* fallback to ConsoleKit, logind is not running */
 #endif
+  if (xfsm_consolekit_can_restart (shutdown->consolekit, can_restart, error))
     return TRUE;
 
+ out:
   if (xfsm_shutdown_sudo_init (shutdown, error))
     {
       *can_restart = TRUE;
@@ -753,12 +765,19 @@ xfsm_shutdown_can_shutdown (XfsmShutdown  *shutdown,
     }
 
 #ifdef HAVE_SYSTEMD
-  if (xfsm_systemd_can_shutdown (shutdown->systemd, can_shutdown, error))
-#else
-  if (xfsm_consolekit_can_shutdown (shutdown->consolekit, can_shutdown, error))
+  if (LOGIND_RUNNING())
+    {
+      if (xfsm_systemd_can_shutdown (shutdown->systemd, can_shutdown, error))
+        return TRUE;
+      goto out; /* skip ConsoleKit polling, logind is running */
+    }
+    /* fallback to ConsoleKit, logind is not running */
 #endif
+
+  if (xfsm_consolekit_can_shutdown (shutdown->consolekit, can_shutdown, error))
     return TRUE;
 
+ out:
   if (xfsm_shutdown_sudo_init (shutdown, error))
     {
       *can_shutdown = TRUE;
-- 
1.8.1.5