fixed detection of deleted files on linux

bin/sau

@@ -5,6 +5,7 @@ import logging.handlers
 import os
 import platform
 import sys
+import time
 
 import sau
 import sau.services
@@ -14,14 +15,20 @@ import sau.platforms
 def main():
     conf = sau.config
     log = logging.getLogger(sau.LOGNAME)
-    reboot_required = False
     platform = sau.platforms.get_platform()
-    #reboot_required = platform.system_upgrade()
+    reboot_required = platform.system_upgrade()
     platform.pkg_upgrade()
 
     reboot_recommended = sau.services.restart_services()
     if conf.getboolean('default', 'do_reboot', fallback=False):
+        if reboot_required:
+            log.warning('Rebooting because of a system upgrade')
+        elif reboot_recommended:
+            log.warning('Rebooting because service restarts did not close all deleted files')
         if reboot_required or reboot_recommended:
+            # sleep a little to make sure the above log-messages has reached
+            # syslog before we reboot
+            time.sleep(1)
             os.system('/sbin/reboot')