From 9d193b6b30c3eed3374776d488d321ab85e56d03 Mon Sep 17 00:00:00 2001
From: Guillaume Ayoub <guillaume.ayoub@kozea.fr>
Date: Fri, 3 Aug 2012 00:29:06 +0200
Subject: [PATCH] Don't start Radicale when PID file exists (fixes #890)

---
 radicale/__main__.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/radicale/__main__.py b/radicale/__main__.py
index b2a0da6f..175f6133 100644
--- a/radicale/__main__.py
+++ b/radicale/__main__.py
@@ -91,6 +91,8 @@ def run():
 
     # Fork if Radicale is launched as daemon
     if options.daemon:
+        if options.pid and os.path.exists(options.pid):
+            raise OSError("PID file exists: %s" % options.pid)
         pid = os.fork()
         if pid:
             try: