From: Frederic Crozat <fcrozat@suse.com>
Date: Tue, 19 Feb 2013 11:20:31 +0100
Subject: Forward suspend / hibernate calls to pm-utils

forward suspend/hibernation calls to pm-utils, if installed (bnc#790157)
---
 src/sleep/sleep.c |   27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

Index: systemd-218/src/sleep/sleep.c
===================================================================
--- systemd-218.orig/src/sleep/sleep.c
+++ systemd-218/src/sleep/sleep.c
@@ -24,6 +24,7 @@
 #include <errno.h>
 #include <string.h>
 #include <getopt.h>
+#include <stdlib.h>
 
 #include "sd-id128.h"
 #include "sd-messages.h"
@@ -36,6 +37,8 @@
 #include "def.h"
 
 static char* arg_verb = NULL;
+static bool delegate_to_pmutils = false;
+static const char *pmtools;
 
 static int write_mode(char **modes) {
         int r = 0;
@@ -53,10 +56,6 @@ static int write_mode(char **modes) {
                 if (r == 0)
                         r = k;
         }
-
-        if (r < 0)
-                log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
-
         return r;
 }
 
@@ -96,6 +95,8 @@ static int execute(char **modes, char **
         int r;
         _cleanup_fclose_ FILE *f = NULL;
 
+      if (!delegate_to_pmutils) {
+
         /* This file is opened first, so that if we hit an error,
          * we can abort before modifying any state. */
         f = fopen("/sys/power/state", "we");
@@ -106,6 +107,7 @@ static int execute(char **modes, char **
         r = write_mode(modes);
         if (r < 0)
                 return r;
+      }
 
         execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments);
 
@@ -114,8 +116,10 @@ static int execute(char **modes, char **
                    LOG_MESSAGE("Suspending system..."),
                    "SLEEP=%s", arg_verb,
                    NULL);
-
+       if (!delegate_to_pmutils)
         r = write_state(&f, states);
+       else
+        r = -system(pmtools);
         if (r < 0)
                 return r;
 
@@ -155,6 +159,7 @@ static int parse_argv(int argc, char *ar
         };
 
         int c;
+        struct stat buf;
 
         assert(argc >= 0);
         assert(argv);
@@ -192,6 +197,18 @@ static int parse_argv(int argc, char *ar
                 return -EINVAL;
         }
 
+        if (streq(arg_verb, "suspend")) {
+                pmtools = "/usr/sbin/pm-suspend";
+        }
+        else if (streq(arg_verb, "hibernate") || streq(arg_verb, "hybrid-sleep")) {
+                if (streq(arg_verb, "hibernate"))
+                        pmtools = "/usr/sbin/pm-hibernate";
+                else
+                        pmtools = "/usr/sbin/pm-suspend-hybrid";
+        }
+
+        delegate_to_pmutils = (stat(pmtools, &buf) >= 0 && S_ISREG(buf.st_mode) && (buf.st_mode & 0111));
+
         return 1 /* work to do */;
 }