use pyinotify to watch for config changes if installed

pandora/app/config.py

@@ -96,6 +96,18 @@ check the README for further details.
 
 def reloader_thread():
     _config_mtime = 0
+    try:
+        import pyinotify
+        INOTIFY = True
+    except:
+        INOTIFY = False
+    if INOTIFY:
+        wm = pyinotify.WatchManager()
+        name = os.path.realpath(settings.SITE_CONFIG)
+        wm.add_watch(name, pyinotify.IN_CLOSE_WRITE, lambda event: load_config())
+        notifier = pyinotify.Notifier(wm)
+        notifier.loop()
+    else:
         while RUN_RELOADER:
             try:
                 stat = os.stat(settings.SITE_CONFIG)
@@ -105,10 +117,10 @@ def reloader_thread():
                 if mtime > _config_mtime:
                     load_config()
                     _config_mtime = mtime
+                time.sleep(1)
             except:
                 #sys.stderr.write("reloading config failed\n")
                 pass
-        time.sleep(1)
 
 def update_static():
     oxjs_build = os.path.join(settings.STATIC_ROOT, 'oxjs/tools/build/build.py')

vm/build.sh

@@ -34,6 +34,7 @@ sudo  vmbuilder vbox ubuntu --suite=precise \
     --addpkg python-imaging \
     --addpkg python-numpy \
     --addpkg python-psycopg2 \
+    --addpkg python-pyinotify \
     --addpkg python-simplejson \
     --addpkg python-lxml \
     --addpkg python-html5lib \